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KVM/ARM changes for Linux 4.8

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- GICv3 ITS emulation
 - Simpler idmap management that fixes potential TLB conflicts
 - Honor the kernel protection in HYP mode
 - Removal of the old vgic implementation
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Merge tag 'kvm-arm-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into next

KVM/ARM changes for Linux 4.8

- GICv3 ITS emulation
- Simpler idmap management that fixes potential TLB conflicts
- Honor the kernel protection in HYP mode
- Removal of the old vgic implementation
This commit is contained in:
Radim Krčmář 2016-07-22 20:27:26 +02:00
commit 912902ce78
54 changed files with 2709 additions and 6076 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
Documentation/virtual/kvm/api.txt
View file

@ -2182,7 +2182,7 @@ after pausing the vcpu, but before it is resumed.
4.71 KVM_SIGNAL_MSI
Capability: KVM_CAP_SIGNAL_MSI
Architectures: x86
Architectures: x86 arm64
Type: vm ioctl
Parameters: struct kvm_msi (in)
Returns: >0 on delivery, 0 if guest blocked the MSI, and -1 on error
@ -2195,10 +2195,18 @@ struct kvm_msi {
__u32 address_hi;
__u32 data;
__u32 flags;
__u8 pad[16];
__u32 devid;
__u8 pad[12];
};
No flags are defined so far. The corresponding field must be 0.
flags: KVM_MSI_VALID_DEVID: devid contains a valid value
devid: If KVM_MSI_VALID_DEVID is set, contains a unique device identifier
for the device that wrote the MSI message.
For PCI, this is usually a BFD identifier in the lower 16 bits.
The per-VM KVM_CAP_MSI_DEVID capability advertises the need to provide
the device ID. If this capability is not set, userland cannot rely on
the kernel to allow the KVM_MSI_VALID_DEVID flag being set.
On x86, address_hi is ignored unless the KVM_CAP_X2APIC_API capability is
enabled. If it is enabled, address_hi bits 31-8 provide bits 31-8 of the

25
Documentation/virtual/kvm/devices/arm-vgic.txt
View file

@ -4,16 +4,22 @@ ARM Virtual Generic Interrupt Controller (VGIC)
Device types supported:
KVM_DEV_TYPE_ARM_VGIC_V2 ARM Generic Interrupt Controller v2.0
KVM_DEV_TYPE_ARM_VGIC_V3 ARM Generic Interrupt Controller v3.0
KVM_DEV_TYPE_ARM_VGIC_ITS ARM Interrupt Translation Service Controller
Only one VGIC instance may be instantiated through either this API or the
legacy KVM_CREATE_IRQCHIP api. The created VGIC will act as the VM interrupt
controller, requiring emulated user-space devices to inject interrupts to the
VGIC instead of directly to CPUs.
Only one VGIC instance of the V2/V3 types above may be instantiated through
either this API or the legacy KVM_CREATE_IRQCHIP api. The created VGIC will
act as the VM interrupt controller, requiring emulated user-space devices to
inject interrupts to the VGIC instead of directly to CPUs.
Creating a guest GICv3 device requires a host GICv3 as well.
GICv3 implementations with hardware compatibility support allow a guest GICv2
as well.
Creating a virtual ITS controller requires a host GICv3 (but does not depend
on having physical ITS controllers).
There can be multiple ITS controllers per guest, each of them has to have
a separate, non-overlapping MMIO region.
Groups:
KVM_DEV_ARM_VGIC_GRP_ADDR
Attributes:
@ -39,6 +45,13 @@ Groups:
Only valid for KVM_DEV_TYPE_ARM_VGIC_V3.
This address needs to be 64K aligned.
KVM_VGIC_V3_ADDR_TYPE_ITS (rw, 64-bit)
Base address in the guest physical address space of the GICv3 ITS
control register frame. The ITS allows MSI(-X) interrupts to be
injected into guests. This extension is optional. If the kernel
does not support the ITS, the call returns -ENODEV.
Only valid for KVM_DEV_TYPE_ARM_VGIC_ITS.
This address needs to be 64K aligned and the region covers 128K.
KVM_DEV_ARM_VGIC_GRP_DIST_REGS
Attributes:
@ -109,8 +122,8 @@ Groups:
KVM_DEV_ARM_VGIC_GRP_CTRL
Attributes:
KVM_DEV_ARM_VGIC_CTRL_INIT
request the initialization of the VGIC, no additional parameter in
kvm_device_attr.addr.
request the initialization of the VGIC or ITS, no additional parameter
in kvm_device_attr.addr.
Errors:
-ENXIO: VGIC not properly configured as required prior to calling
this attribute

2
arch/arm/include/asm/kvm_asm.h
View file

@ -66,6 +66,8 @@ extern void __kvm_tlb_flush_vmid(struct kvm *kvm);
extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu);
extern void __init_stage2_translation(void);
extern void __kvm_hyp_reset(unsigned long);
#endif
#endif /* __ARM_KVM_ASM_H__ */

27
arch/arm/include/asm/kvm_host.h
View file

@ -241,8 +241,7 @@ int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
int exception_index);
static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
phys_addr_t pgd_ptr,
static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
unsigned long hyp_stack_ptr,
unsigned long vector_ptr)
{
@ -251,18 +250,13 @@ static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
* code. The init code doesn't need to preserve these
* registers as r0-r3 are already callee saved according to
* the AAPCS.
* Note that we slightly misuse the prototype by casing the
* Note that we slightly misuse the prototype by casting the
* stack pointer to a void *.
*
* We don't have enough registers to perform the full init in
* one go. Install the boot PGD first, and then install the
* runtime PGD, stack pointer and vectors. The PGDs are always
* passed as the third argument, in order to be passed into
* r2-r3 to the init code (yes, this is compliant with the
* PCS!).
*/
kvm_call_hyp(NULL, 0, boot_pgd_ptr);
* The PGDs are always passed as the third argument, in order
* to be passed into r2-r3 to the init code (yes, this is
* compliant with the PCS!).
*/
kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
}
@ -272,16 +266,13 @@ static inline void __cpu_init_stage2(void)
kvm_call_hyp(__init_stage2_translation);
}
static inline void __cpu_reset_hyp_mode(phys_addr_t boot_pgd_ptr,
static inline void __cpu_reset_hyp_mode(unsigned long vector_ptr,
phys_addr_t phys_idmap_start)
{
/*
* TODO
* kvm_call_reset(boot_pgd_ptr, phys_idmap_start);
*/
kvm_call_hyp((void *)virt_to_idmap(__kvm_hyp_reset), vector_ptr);
}
static inline int kvm_arch_dev_ioctl_check_extension(long ext)
static inline int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext)
{
return 0;
}

3
arch/arm/include/asm/kvm_hyp.h
View file

@ -25,9 +25,6 @@
#define __hyp_text __section(.hyp.text) notrace
#define kern_hyp_va(v) (v)
#define hyp_kern_va(v) (v)
#define __ACCESS_CP15(CRn, Op1, CRm, Op2) \
"mrc", "mcr", __stringify(p15, Op1, %0, CRn, CRm, Op2), u32
#define __ACCESS_CP15_64(Op1, CRm) \

15
arch/arm/include/asm/kvm_mmu.h
View file

@ -26,16 +26,7 @@
* We directly use the kernel VA for the HYP, as we can directly share
* the mapping (HTTBR "covers" TTBR1).
*/
#define HYP_PAGE_OFFSET_MASK UL(~0)
#define HYP_PAGE_OFFSET PAGE_OFFSET
#define KERN_TO_HYP(kva) (kva)
/*
* Our virtual mapping for the boot-time MMU-enable code. Must be
* shared across all the page-tables. Conveniently, we use the vectors
* page, where no kernel data will ever be shared with HYP.
*/
#define TRAMPOLINE_VA UL(CONFIG_VECTORS_BASE)
#define kern_hyp_va(kva) (kva)
/*
* KVM_MMU_CACHE_MIN_PAGES is the number of stage2 page table translation levels.
@ -49,9 +40,8 @@
#include <asm/pgalloc.h>
#include <asm/stage2_pgtable.h>
int create_hyp_mappings(void *from, void *to);
int create_hyp_mappings(void *from, void *to, pgprot_t prot);
int create_hyp_io_mappings(void *from, void *to, phys_addr_t);
void free_boot_hyp_pgd(void);
void free_hyp_pgds(void);
void stage2_unmap_vm(struct kvm *kvm);
@ -65,7 +55,6 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run);
void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu);
phys_addr_t kvm_mmu_get_httbr(void);
phys_addr_t kvm_mmu_get_boot_httbr(void);
phys_addr_t kvm_get_idmap_vector(void);
phys_addr_t kvm_get_idmap_start(void);
int kvm_mmu_init(void);

4
arch/arm/include/asm/pgtable.h
View file

@ -97,7 +97,9 @@ extern pgprot_t pgprot_s2_device;
#define PAGE_READONLY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY)
#define PAGE_KERNEL _MOD_PROT(pgprot_kernel, L_PTE_XN)
#define PAGE_KERNEL_EXEC pgprot_kernel
#define PAGE_HYP _MOD_PROT(pgprot_kernel, L_PTE_HYP)
#define PAGE_HYP _MOD_PROT(pgprot_kernel, L_PTE_HYP | L_PTE_XN)
#define PAGE_HYP_EXEC _MOD_PROT(pgprot_kernel, L_PTE_HYP | L_PTE_RDONLY)
#define PAGE_HYP_RO _MOD_PROT(pgprot_kernel, L_PTE_HYP | L_PTE_RDONLY | L_PTE_XN)
#define PAGE_HYP_DEVICE _MOD_PROT(pgprot_hyp_device, L_PTE_HYP)
#define PAGE_S2 _MOD_PROT(pgprot_s2, L_PTE_S2_RDONLY)
#define PAGE_S2_DEVICE _MOD_PROT(pgprot_s2_device, L_PTE_S2_RDONLY)

4
arch/arm/include/asm/virt.h
View file

@ -80,6 +80,10 @@ static inline bool is_kernel_in_hyp_mode(void)
return false;
}
/* The section containing the hypervisor idmap text */
extern char __hyp_idmap_text_start[];
extern char __hyp_idmap_text_end[];
/* The section containing the hypervisor text */
extern char __hyp_text_start[];
extern char __hyp_text_end[];

7
arch/arm/kvm/Kconfig
View file

@ -46,13 +46,6 @@ config KVM_ARM_HOST
---help---
Provides host support for ARM processors.
config KVM_NEW_VGIC
bool "New VGIC implementation"
depends on KVM
default y
---help---
uses the new VGIC implementation
source drivers/vhost/Kconfig
endif # VIRTUALIZATION

6
arch/arm/kvm/Makefile
View file

@ -22,7 +22,6 @@ obj-y += kvm-arm.o init.o interrupts.o
obj-y += arm.o handle_exit.o guest.o mmu.o emulate.o reset.o
obj-y += coproc.o coproc_a15.o coproc_a7.o mmio.o psci.o perf.o
ifeq ($(CONFIG_KVM_NEW_VGIC),y)
obj-y += $(KVM)/arm/vgic/vgic.o
obj-y += $(KVM)/arm/vgic/vgic-init.o
obj-y += $(KVM)/arm/vgic/vgic-irqfd.o
@ -30,9 +29,4 @@ obj-y += $(KVM)/arm/vgic/vgic-v2.o
obj-y += $(KVM)/arm/vgic/vgic-mmio.o
obj-y += $(KVM)/arm/vgic/vgic-mmio-v2.o
obj-y += $(KVM)/arm/vgic/vgic-kvm-device.o
else
obj-y += $(KVM)/arm/vgic.o
obj-y += $(KVM)/arm/vgic-v2.o
obj-y += $(KVM)/arm/vgic-v2-emul.o
endif
obj-y += $(KVM)/arm/arch_timer.o

36
arch/arm/kvm/arm.c
View file

@ -20,6 +20,7 @@
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
@ -122,7 +123,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
if (ret)
goto out_fail_alloc;
ret = create_hyp_mappings(kvm, kvm + 1);
ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP);
if (ret)
goto out_free_stage2_pgd;
@ -201,7 +202,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
r = KVM_MAX_VCPUS;
break;
default:
r = kvm_arch_dev_ioctl_check_extension(ext);
r = kvm_arch_dev_ioctl_check_extension(kvm, ext);
break;
}
return r;
@ -239,7 +240,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
if (err)
goto free_vcpu;
err = create_hyp_mappings(vcpu, vcpu + 1);
err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
if (err)
goto vcpu_uninit;
@ -1038,7 +1039,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
static void cpu_init_hyp_mode(void *dummy)
{
phys_addr_t boot_pgd_ptr;
phys_addr_t pgd_ptr;
unsigned long hyp_stack_ptr;
unsigned long stack_page;
@ -1047,13 +1047,12 @@ static void cpu_init_hyp_mode(void *dummy)
/* Switch from the HYP stub to our own HYP init vector */
__hyp_set_vectors(kvm_get_idmap_vector());
boot_pgd_ptr = kvm_mmu_get_boot_httbr();
pgd_ptr = kvm_mmu_get_httbr();
stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
hyp_stack_ptr = stack_page + PAGE_SIZE;
vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector);
__cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr);
__cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
__cpu_init_stage2();
kvm_arm_init_debug();
@ -1075,15 +1074,9 @@ static void cpu_hyp_reinit(void)
static void cpu_hyp_reset(void)
{
phys_addr_t boot_pgd_ptr;
phys_addr_t phys_idmap_start;
if (!is_kernel_in_hyp_mode()) {
boot_pgd_ptr = kvm_mmu_get_boot_httbr();
phys_idmap_start = kvm_get_idmap_start();
__cpu_reset_hyp_mode(boot_pgd_ptr, phys_idmap_start);
}
if (!is_kernel_in_hyp_mode())
__cpu_reset_hyp_mode(hyp_default_vectors,
kvm_get_idmap_start());
}
static void _kvm_arch_hardware_enable(void *discard)
@ -1293,14 +1286,14 @@ static int init_hyp_mode(void)
* Map the Hyp-code called directly from the host
*/
err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
kvm_ksym_ref(__hyp_text_end));
kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
if (err) {
kvm_err("Cannot map world-switch code\n");
goto out_err;
}
err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
kvm_ksym_ref(__end_rodata));
kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
if (err) {
kvm_err("Cannot map rodata section\n");
goto out_err;
@ -1311,7 +1304,8 @@ static int init_hyp_mode(void)
*/
for_each_possible_cpu(cpu) {
char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE);
err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
PAGE_HYP);
if (err) {
kvm_err("Cannot map hyp stack\n");
@ -1323,7 +1317,7 @@ static int init_hyp_mode(void)
kvm_cpu_context_t *cpu_ctxt;
cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1);
err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1, PAGE_HYP);
if (err) {
kvm_err("Cannot map host CPU state: %d\n", err);
@ -1331,10 +1325,6 @@ static int init_hyp_mode(void)
}
}
#ifndef CONFIG_HOTPLUG_CPU
free_boot_hyp_pgd();
#endif
/* set size of VMID supported by CPU */
kvm_vmid_bits = kvm_get_vmid_bits();
kvm_info("%d-bit VMID\n", kvm_vmid_bits);

62
arch/arm/kvm/init.S
View file

@ -32,23 +32,13 @@
* r2,r3 = Hypervisor pgd pointer
*
* The init scenario is:
* - We jump in HYP with four parameters: boot HYP pgd, runtime HYP pgd,
* runtime stack, runtime vectors
* - Enable the MMU with the boot pgd
* - Jump to a target into the trampoline page (remember, this is the same
* physical page!)
* - Now switch to the runtime pgd (same VA, and still the same physical
* page!)
* - We jump in HYP with 3 parameters: runtime HYP pgd, runtime stack,
* runtime vectors
* - Invalidate TLBs
* - Set stack and vectors
* - Setup the page tables
* - Enable the MMU
* - Profit! (or eret, if you only care about the code).
*
* As we only have four registers available to pass parameters (and we
* need six), we split the init in two phases:
* - Phase 1: r0 = 0, r1 = 0, r2,r3 contain the boot PGD.
* Provides the basic HYP init, and enable the MMU.
* - Phase 2: r0 = ToS, r1 = vectors, r2,r3 contain the runtime PGD.
* Switches to the runtime PGD, set stack and vectors.
*/
.text
@ -68,8 +58,11 @@ __kvm_hyp_init:
W(b) .
__do_hyp_init:
cmp r0, #0 @ We have a SP?
bne phase2 @ Yes, second stage init
@ Set stack pointer
mov sp, r0
@ Set HVBAR to point to the HYP vectors
mcr p15, 4, r1, c12, c0, 0 @ HVBAR
@ Set the HTTBR to point to the hypervisor PGD pointer passed
mcrr p15, 4, rr_lo_hi(r2, r3), c2
@ -114,34 +107,25 @@ __do_hyp_init:
THUMB( ldr r2, =(HSCTLR_M | HSCTLR_A | HSCTLR_TE) )
orr r1, r1, r2
orr r0, r0, r1
isb
mcr p15, 4, r0, c1, c0, 0 @ HSCR
@ End of init phase-1
eret
phase2:
@ Set stack pointer
mov sp, r0
@ Set HVBAR to point to the HYP vectors
mcr p15, 4, r1, c12, c0, 0 @ HVBAR
@ Jump to the trampoline page
ldr r0, =TRAMPOLINE_VA
adr r1, target
bfi r0, r1, #0, #PAGE_SHIFT
ret r0
target: @ We're now in the trampoline code, switch page tables
mcrr p15, 4, rr_lo_hi(r2, r3), c2
isb
@ Invalidate the old TLBs
mcr p15, 4, r0, c8, c7, 0 @ TLBIALLH
dsb ish
eret
@ r0 : stub vectors address
ENTRY(__kvm_hyp_reset)
/* We're now in idmap, disable MMU */
mrc p15, 4, r1, c1, c0, 0 @ HSCTLR
ldr r2, =(HSCTLR_M | HSCTLR_A | HSCTLR_C | HSCTLR_I)
bic r1, r1, r2
mcr p15, 4, r1, c1, c0, 0 @ HSCTLR
/* Install stub vectors */
mcr p15, 4, r0, c12, c0, 0 @ HVBAR
isb
eret
ENDPROC(__kvm_hyp_reset)
.ltorg

144
arch/arm/kvm/mmu.c
View file

@ -32,8 +32,6 @@
#include "trace.h"
extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[];
static pgd_t *boot_hyp_pgd;
static pgd_t *hyp_pgd;
static pgd_t *merged_hyp_pgd;
@ -483,28 +481,6 @@ static void unmap_hyp_range(pgd_t *pgdp, phys_addr_t start, u64 size)
} while (pgd++, addr = next, addr != end);
}
/**
* free_boot_hyp_pgd - free HYP boot page tables
*
* Free the HYP boot page tables. The bounce page is also freed.
*/
void free_boot_hyp_pgd(void)
{
mutex_lock(&kvm_hyp_pgd_mutex);
if (boot_hyp_pgd) {
unmap_hyp_range(boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
unmap_hyp_range(boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
free_pages((unsigned long)boot_hyp_pgd, hyp_pgd_order);
boot_hyp_pgd = NULL;
}
if (hyp_pgd)
unmap_hyp_range(hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
mutex_unlock(&kvm_hyp_pgd_mutex);
}
/**
* free_hyp_pgds - free Hyp-mode page tables
*
@ -519,15 +495,20 @@ void free_hyp_pgds(void)
{
unsigned long addr;
free_boot_hyp_pgd();
mutex_lock(&kvm_hyp_pgd_mutex);
if (boot_hyp_pgd) {
unmap_hyp_range(boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
free_pages((unsigned long)boot_hyp_pgd, hyp_pgd_order);
boot_hyp_pgd = NULL;
}
if (hyp_pgd) {
unmap_hyp_range(hyp_pgd, hyp_idmap_start, PAGE_SIZE);
for (addr = PAGE_OFFSET; virt_addr_valid(addr); addr += PGDIR_SIZE)
unmap_hyp_range(hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
unmap_hyp_range(hyp_pgd, kern_hyp_va(addr), PGDIR_SIZE);
for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr += PGDIR_SIZE)
unmap_hyp_range(hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
unmap_hyp_range(hyp_pgd, kern_hyp_va(addr), PGDIR_SIZE);
free_pages((unsigned long)hyp_pgd, hyp_pgd_order);
hyp_pgd = NULL;
@ -679,17 +660,18 @@ static phys_addr_t kvm_kaddr_to_phys(void *kaddr)
* create_hyp_mappings - duplicate a kernel virtual address range in Hyp mode
* @from: The virtual kernel start address of the range
* @to: The virtual kernel end address of the range (exclusive)
* @prot: The protection to be applied to this range
*
* The same virtual address as the kernel virtual address is also used
* in Hyp-mode mapping (modulo HYP_PAGE_OFFSET) to the same underlying
* physical pages.
*/
int create_hyp_mappings(void *from, void *to)
int create_hyp_mappings(void *from, void *to, pgprot_t prot)
{
phys_addr_t phys_addr;
unsigned long virt_addr;
unsigned long start = KERN_TO_HYP((unsigned long)from);
unsigned long end = KERN_TO_HYP((unsigned long)to);
unsigned long start = kern_hyp_va((unsigned long)from);
unsigned long end = kern_hyp_va((unsigned long)to);
if (is_kernel_in_hyp_mode())
return 0;
@ -704,7 +686,7 @@ int create_hyp_mappings(void *from, void *to)
err = __create_hyp_mappings(hyp_pgd, virt_addr,
virt_addr + PAGE_SIZE,
__phys_to_pfn(phys_addr),
PAGE_HYP);
prot);
if (err)
return err;
}
@ -723,8 +705,8 @@ int create_hyp_mappings(void *from, void *to)
*/
int create_hyp_io_mappings(void *from, void *to, phys_addr_t phys_addr)
{
unsigned long start = KERN_TO_HYP((unsigned long)from);
unsigned long end = KERN_TO_HYP((unsigned long)to);
unsigned long start = kern_hyp_va((unsigned long)from);
unsigned long end = kern_hyp_va((unsigned long)to);
if (is_kernel_in_hyp_mode())
return 0;
@ -1687,14 +1669,6 @@ phys_addr_t kvm_mmu_get_httbr(void)
return virt_to_phys(hyp_pgd);
}
phys_addr_t kvm_mmu_get_boot_httbr(void)
{
if (__kvm_cpu_uses_extended_idmap())
return virt_to_phys(merged_hyp_pgd);
else
return virt_to_phys(boot_hyp_pgd);
}
phys_addr_t kvm_get_idmap_vector(void)
{
return hyp_idmap_vector;
@ -1705,6 +1679,22 @@ phys_addr_t kvm_get_idmap_start(void)
return hyp_idmap_start;
}
static int kvm_map_idmap_text(pgd_t *pgd)
{
int err;
/* Create the idmap in the boot page tables */
err = __create_hyp_mappings(pgd,
hyp_idmap_start, hyp_idmap_end,
__phys_to_pfn(hyp_idmap_start),
PAGE_HYP_EXEC);
if (err)
kvm_err("Failed to idmap %lx-%lx\n",
hyp_idmap_start, hyp_idmap_end);
return err;
}
int kvm_mmu_init(void)
{
int err;
@ -1719,28 +1709,41 @@ int kvm_mmu_init(void)
*/
BUG_ON((hyp_idmap_start ^ (hyp_idmap_end - 1)) & PAGE_MASK);
hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, hyp_pgd_order);
boot_hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, hyp_pgd_order);
kvm_info("IDMAP page: %lx\n", hyp_idmap_start);
kvm_info("HYP VA range: %lx:%lx\n",
kern_hyp_va(PAGE_OFFSET), kern_hyp_va(~0UL));
if (!hyp_pgd || !boot_hyp_pgd) {
if (hyp_idmap_start >= kern_hyp_va(PAGE_OFFSET) &&
hyp_idmap_start < kern_hyp_va(~0UL)) {
/*
* The idmap page is intersecting with the VA space,
* it is not safe to continue further.
*/
kvm_err("IDMAP intersecting with HYP VA, unable to continue\n");
err = -EINVAL;
goto out;
}
hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, hyp_pgd_order);
if (!hyp_pgd) {
kvm_err("Hyp mode PGD not allocated\n");
err = -ENOMEM;
goto out;
}
/* Create the idmap in the boot page tables */
err = __create_hyp_mappings(boot_hyp_pgd,
hyp_idmap_start, hyp_idmap_end,
__phys_to_pfn(hyp_idmap_start),
PAGE_HYP);
if (err) {
kvm_err("Failed to idmap %lx-%lx\n",
hyp_idmap_start, hyp_idmap_end);
goto out;
}
if (__kvm_cpu_uses_extended_idmap()) {
boot_hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
hyp_pgd_order);
if (!boot_hyp_pgd) {
kvm_err("Hyp boot PGD not allocated\n");
err = -ENOMEM;
goto out;
}
err = kvm_map_idmap_text(boot_hyp_pgd);
if (err)
goto out;
merged_hyp_pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
if (!merged_hyp_pgd) {
kvm_err("Failed to allocate extra HYP pgd\n");
@ -1748,29 +1751,10 @@ int kvm_mmu_init(void)
}
__kvm_extend_hypmap(boot_hyp_pgd, hyp_pgd, merged_hyp_pgd,
hyp_idmap_start);
return 0;
}
/* Map the very same page at the trampoline VA */
err = __create_hyp_mappings(boot_hyp_pgd,
TRAMPOLINE_VA, TRAMPOLINE_VA + PAGE_SIZE,
__phys_to_pfn(hyp_idmap_start),
PAGE_HYP);
if (err) {
kvm_err("Failed to map trampoline @%lx into boot HYP pgd\n",
TRAMPOLINE_VA);
goto out;
}
/* Map the same page again into the runtime page tables */
err = __create_hyp_mappings(hyp_pgd,
TRAMPOLINE_VA, TRAMPOLINE_VA + PAGE_SIZE,
__phys_to_pfn(hyp_idmap_start),
PAGE_HYP);
if (err) {
kvm_err("Failed to map trampoline @%lx into runtime HYP pgd\n",
TRAMPOLINE_VA);
goto out;
} else {
err = kvm_map_idmap_text(hyp_pgd);
if (err)
goto out;
}
return 0;

3
arch/arm64/include/asm/cpufeature.h
View file

@ -36,8 +36,9 @@
#define ARM64_HAS_VIRT_HOST_EXTN 11
#define ARM64_WORKAROUND_CAVIUM_27456 12
#define ARM64_HAS_32BIT_EL0 13
#define ARM64_HYP_OFFSET_LOW 14
#define ARM64_NCAPS 14
#define ARM64_NCAPS 15
#ifndef __ASSEMBLY__

19
arch/arm64/include/asm/kvm_host.h
View file

@ -47,8 +47,7 @@
int __attribute_const__ kvm_target_cpu(void);
int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
int kvm_arch_dev_ioctl_check_extension(long ext);
unsigned long kvm_hyp_reset_entry(void);
int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext);
void __extended_idmap_trampoline(phys_addr_t boot_pgd, phys_addr_t idmap_start);
struct kvm_arch {
@ -348,8 +347,7 @@ int kvm_perf_teardown(void);
struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
phys_addr_t pgd_ptr,
static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
unsigned long hyp_stack_ptr,
unsigned long vector_ptr)
{
@ -357,19 +355,14 @@ static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
* Call initialization code, and switch to the full blown
* HYP code.
*/
__kvm_call_hyp((void *)boot_pgd_ptr, pgd_ptr,
hyp_stack_ptr, vector_ptr);
__kvm_call_hyp((void *)pgd_ptr, hyp_stack_ptr, vector_ptr);
}
static inline void __cpu_reset_hyp_mode(phys_addr_t boot_pgd_ptr,
void __kvm_hyp_teardown(void);
static inline void __cpu_reset_hyp_mode(unsigned long vector_ptr,
phys_addr_t phys_idmap_start)
{
/*
* Call reset code, and switch back to stub hyp vectors.
* Uses __kvm_call_hyp() to avoid kaslr's kvm_ksym_ref() translation.
*/
__kvm_call_hyp((void *)kvm_hyp_reset_entry(),
boot_pgd_ptr, phys_idmap_start);
kvm_call_hyp(__kvm_hyp_teardown, phys_idmap_start);
}
static inline void kvm_arch_hardware_unsetup(void) {}

23
arch/arm64/include/asm/kvm_hyp.h
View file

@ -25,29 +25,6 @@
#define __hyp_text __section(.hyp.text) notrace
static inline unsigned long __kern_hyp_va(unsigned long v)
{
asm volatile(ALTERNATIVE("and %0, %0, %1",
"nop",
ARM64_HAS_VIRT_HOST_EXTN)
: "+r" (v) : "i" (HYP_PAGE_OFFSET_MASK));
return v;
}
#define kern_hyp_va(v) (typeof(v))(__kern_hyp_va((unsigned long)(v)))
static inline unsigned long __hyp_kern_va(unsigned long v)
{
u64 offset = PAGE_OFFSET - HYP_PAGE_OFFSET;
asm volatile(ALTERNATIVE("add %0, %0, %1",
"nop",
ARM64_HAS_VIRT_HOST_EXTN)
: "+r" (v) : "r" (offset));
return v;
}
#define hyp_kern_va(v) (typeof(v))(__hyp_kern_va((unsigned long)(v)))
#define read_sysreg_elx(r,nvh,vh) \
({ \
u64 reg; \

96
arch/arm64/include/asm/kvm_mmu.h
View file

@ -29,21 +29,48 @@
*
* Instead, give the HYP mode its own VA region at a fixed offset from
* the kernel by just masking the top bits (which are all ones for a
* kernel address).
* kernel address). We need to find out how many bits to mask.
*
* ARMv8.1 (using VHE) does have a TTBR1_EL2, and doesn't use these
* macros (the entire kernel runs at EL2).
* We want to build a set of page tables that cover both parts of the
* idmap (the trampoline page used to initialize EL2), and our normal
* runtime VA space, at the same time.
*
* Given that the kernel uses VA_BITS for its entire address space,
* and that half of that space (VA_BITS - 1) is used for the linear
* mapping, we can also limit the EL2 space to (VA_BITS - 1).
*
* The main question is "Within the VA_BITS space, does EL2 use the
* top or the bottom half of that space to shadow the kernel's linear
* mapping?". As we need to idmap the trampoline page, this is
* determined by the range in which this page lives.
*
* If the page is in the bottom half, we have to use the top half. If
* the page is in the top half, we have to use the bottom half:
*
* T = __virt_to_phys(__hyp_idmap_text_start)
* if (T & BIT(VA_BITS - 1))
* HYP_VA_MIN = 0 //idmap in upper half
* else
* HYP_VA_MIN = 1 << (VA_BITS - 1)
* HYP_VA_MAX = HYP_VA_MIN + (1 << (VA_BITS - 1)) - 1
*
* This of course assumes that the trampoline page exists within the
* VA_BITS range. If it doesn't, then it means we're in the odd case
* where the kernel idmap (as well as HYP) uses more levels than the
* kernel runtime page tables (as seen when the kernel is configured
* for 4k pages, 39bits VA, and yet memory lives just above that
* limit, forcing the idmap to use 4 levels of page tables while the
* kernel itself only uses 3). In this particular case, it doesn't
* matter which side of VA_BITS we use, as we're guaranteed not to
* conflict with anything.
*
* When using VHE, there are no separate hyp mappings and all KVM
* functionality is already mapped as part of the main kernel
* mappings, and none of this applies in that case.
*/
#define HYP_PAGE_OFFSET_SHIFT VA_BITS
#define HYP_PAGE_OFFSET_MASK ((UL(1) << HYP_PAGE_OFFSET_SHIFT) - 1)
#define HYP_PAGE_OFFSET (PAGE_OFFSET & HYP_PAGE_OFFSET_MASK)
/*
* Our virtual mapping for the idmap-ed MMU-enable code. Must be
* shared across all the page-tables. Conveniently, we use the last
* possible page, where no kernel mapping will ever exist.
*/
#define TRAMPOLINE_VA (HYP_PAGE_OFFSET_MASK & PAGE_MASK)
#define HYP_PAGE_OFFSET_HIGH_MASK ((UL(1) << VA_BITS) - 1)
#define HYP_PAGE_OFFSET_LOW_MASK ((UL(1) << (VA_BITS - 1)) - 1)
#ifdef __ASSEMBLY__
@ -53,13 +80,33 @@
/*
* Convert a kernel VA into a HYP VA.
* reg: VA to be converted.
*
* This generates the following sequences:
* - High mask:
* and x0, x0, #HYP_PAGE_OFFSET_HIGH_MASK
* nop
* - Low mask:
* and x0, x0, #HYP_PAGE_OFFSET_HIGH_MASK
* and x0, x0, #HYP_PAGE_OFFSET_LOW_MASK
* - VHE:
* nop
* nop
*
* The "low mask" version works because the mask is a strict subset of
* the "high mask", hence performing the first mask for nothing.
* Should be completely invisible on any viable CPU.
*/
.macro kern_hyp_va reg
alternative_if_not ARM64_HAS_VIRT_HOST_EXTN
and \reg, \reg, #HYP_PAGE_OFFSET_MASK
alternative_if_not ARM64_HAS_VIRT_HOST_EXTN
and \reg, \reg, #HYP_PAGE_OFFSET_HIGH_MASK
alternative_else
nop
alternative_endif
alternative_if_not ARM64_HYP_OFFSET_LOW
nop
alternative_else
and \reg, \reg, #HYP_PAGE_OFFSET_LOW_MASK
alternative_endif
.endm
#else
@ -70,7 +117,22 @@ alternative_endif
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#define KERN_TO_HYP(kva) ((unsigned long)kva - PAGE_OFFSET + HYP_PAGE_OFFSET)
static inline unsigned long __kern_hyp_va(unsigned long v)
{
asm volatile(ALTERNATIVE("and %0, %0, %1",
"nop",
ARM64_HAS_VIRT_HOST_EXTN)
: "+r" (v)
: "i" (HYP_PAGE_OFFSET_HIGH_MASK));
asm volatile(ALTERNATIVE("nop",
"and %0, %0, %1",
ARM64_HYP_OFFSET_LOW)
: "+r" (v)
: "i" (HYP_PAGE_OFFSET_LOW_MASK));
return v;
}
#define kern_hyp_va(v) (typeof(v))(__kern_hyp_va((unsigned long)(v)))
/*
* We currently only support a 40bit IPA.
@ -81,9 +143,8 @@ alternative_endif
#include <asm/stage2_pgtable.h>
int create_hyp_mappings(void *from, void *to);
int create_hyp_mappings(void *from, void *to, pgprot_t prot);
int create_hyp_io_mappings(void *from, void *to, phys_addr_t);
void free_boot_hyp_pgd(void);
void free_hyp_pgds(void);
void stage2_unmap_vm(struct kvm *kvm);
@ -97,7 +158,6 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run);
void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu);
phys_addr_t kvm_mmu_get_httbr(void);
phys_addr_t kvm_mmu_get_boot_httbr(void);
phys_addr_t kvm_get_idmap_vector(void);
phys_addr_t kvm_get_idmap_start(void);
int kvm_mmu_init(void);

1
arch/arm64/include/asm/pgtable-hwdef.h
View file

@ -164,6 +164,7 @@
#define PTE_CONT (_AT(pteval_t, 1) << 52) /* Contiguous range */
#define PTE_PXN (_AT(pteval_t, 1) << 53) /* Privileged XN */
#define PTE_UXN (_AT(pteval_t, 1) << 54) /* User XN */
#define PTE_HYP_XN (_AT(pteval_t, 1) << 54) /* HYP XN */
/*
* AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).

4
arch/arm64/include/asm/pgtable-prot.h
View file

@ -55,7 +55,9 @@
#define PAGE_KERNEL_EXEC __pgprot(_PAGE_DEFAULT | PTE_UXN | PTE_DIRTY | PTE_WRITE)
#define PAGE_KERNEL_EXEC_CONT __pgprot(_PAGE_DEFAULT | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_CONT)
#define PAGE_HYP __pgprot(_PAGE_DEFAULT | PTE_HYP)
#define PAGE_HYP __pgprot(_PAGE_DEFAULT | PTE_HYP | PTE_HYP_XN)
#define PAGE_HYP_EXEC __pgprot(_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY)
#define PAGE_HYP_RO __pgprot(_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY | PTE_HYP_XN)
#define PAGE_HYP_DEVICE __pgprot(PROT_DEVICE_nGnRE | PTE_HYP)
#define PAGE_S2 __pgprot(PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_NORMAL) | PTE_S2_RDONLY)

4
arch/arm64/include/asm/virt.h
View file

@ -82,6 +82,10 @@ extern void verify_cpu_run_el(void);
static inline void verify_cpu_run_el(void) {}
#endif
/* The section containing the hypervisor idmap text */
extern char __hyp_idmap_text_start[];
extern char __hyp_idmap_text_end[];
/* The section containing the hypervisor text */
extern char __hyp_text_start[];
extern char __hyp_text_end[];

2
arch/arm64/include/uapi/asm/kvm.h
View file

@ -87,9 +87,11 @@ struct kvm_regs {
/* Supported VGICv3 address types */
#define KVM_VGIC_V3_ADDR_TYPE_DIST 2
#define KVM_VGIC_V3_ADDR_TYPE_REDIST 3
#define KVM_VGIC_ITS_ADDR_TYPE 4
#define KVM_VGIC_V3_DIST_SIZE SZ_64K
#define KVM_VGIC_V3_REDIST_SIZE (2 * SZ_64K)
#define KVM_VGIC_V3_ITS_SIZE (2 * SZ_64K)
#define KVM_ARM_VCPU_POWER_OFF 0 /* CPU is started in OFF state */
#define KVM_ARM_VCPU_EL1_32BIT 1 /* CPU running a 32bit VM */

19
arch/arm64/kernel/cpufeature.c
View file

@ -726,6 +726,19 @@ static bool runs_at_el2(const struct arm64_cpu_capabilities *entry, int __unused
return is_kernel_in_hyp_mode();
}
static bool hyp_offset_low(const struct arm64_cpu_capabilities *entry,
int __unused)
{
phys_addr_t idmap_addr = virt_to_phys(__hyp_idmap_text_start);
/*
* Activate the lower HYP offset only if:
* - the idmap doesn't clash with it,
* - the kernel is not running at EL2.
*/
return idmap_addr > GENMASK(VA_BITS - 2, 0) && !is_kernel_in_hyp_mode();
}
static const struct arm64_cpu_capabilities arm64_features[] = {
{
.desc = "GIC system register CPU interface",
@ -803,6 +816,12 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.field_pos = ID_AA64PFR0_EL0_SHIFT,
.min_field_value = ID_AA64PFR0_EL0_32BIT_64BIT,
},
{
.desc = "Reduced HYP mapping offset",
.capability = ARM64_HYP_OFFSET_LOW,
.def_scope = SCOPE_SYSTEM,
.matches = hyp_offset_low,
},
{},
};

8
arch/arm64/kvm/Kconfig
View file

@ -36,6 +36,7 @@ config KVM
select HAVE_KVM_IRQFD
select KVM_ARM_VGIC_V3
select KVM_ARM_PMU if HW_PERF_EVENTS
select HAVE_KVM_MSI
---help---
Support hosting virtualized guest machines.
We don't support KVM with 16K page tables yet, due to the multiple
@ -54,13 +55,6 @@ config KVM_ARM_PMU
Adds support for a virtual Performance Monitoring Unit (PMU) in
virtual machines.
config KVM_NEW_VGIC
bool "New VGIC implementation"
depends on KVM
default y
---help---
uses the new VGIC implementation
source drivers/vhost/Kconfig
endif # VIRTUALIZATION

9
arch/arm64/kvm/Makefile
View file

@ -20,7 +20,6 @@ kvm-$(CONFIG_KVM_ARM_HOST) += emulate.o inject_fault.o regmap.o
kvm-$(CONFIG_KVM_ARM_HOST) += hyp.o hyp-init.o handle_exit.o
kvm-$(CONFIG_KVM_ARM_HOST) += guest.o debug.o reset.o sys_regs.o sys_regs_generic_v8.o
ifeq ($(CONFIG_KVM_NEW_VGIC),y)
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-init.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-irqfd.o
@ -30,12 +29,6 @@ kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-mmio.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-mmio-v2.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-mmio-v3.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-kvm-device.o
else
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic-v2.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic-v2-emul.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic-v3.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic-v3-emul.o
endif
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-its.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/arch_timer.o
kvm-$(CONFIG_KVM_ARM_PMU) += $(KVM)/arm/pmu.o

61
arch/arm64/kvm/hyp-init.S
View file

@ -53,10 +53,9 @@ __invalid:
b .
/*
* x0: HYP boot pgd
* x1: HYP pgd
* x2: HYP stack
* x3: HYP vectors
* x0: HYP pgd
* x1: HYP stack
* x2: HYP vectors
*/
__do_hyp_init:
@ -110,71 +109,27 @@ __do_hyp_init:
msr sctlr_el2, x4
isb
/* Skip the trampoline dance if we merged the boot and runtime PGDs */
cmp x0, x1
b.eq merged
/* MMU is now enabled. Get ready for the trampoline dance */
ldr x4, =TRAMPOLINE_VA
adr x5, target
bfi x4, x5, #0, #PAGE_SHIFT
br x4
target: /* We're now in the trampoline code, switch page tables */
msr ttbr0_el2, x1
isb
/* Invalidate the old TLBs */
tlbi alle2
dsb sy
merged:
/* Set the stack and new vectors */
kern_hyp_va x1
mov sp, x1
kern_hyp_va x2
mov sp, x2
kern_hyp_va x3
msr vbar_el2, x3
msr vbar_el2, x2
/* Hello, World! */
eret
ENDPROC(__kvm_hyp_init)
/*
* Reset kvm back to the hyp stub. This is the trampoline dance in
* reverse. If kvm used an extended idmap, __extended_idmap_trampoline
* calls this code directly in the idmap. In this case switching to the
* boot tables is a no-op.
*
* x0: HYP boot pgd
* x1: HYP phys_idmap_start
* Reset kvm back to the hyp stub.
*/
ENTRY(__kvm_hyp_reset)
/* We're in trampoline code in VA, switch back to boot page tables */
msr ttbr0_el2, x0
isb
/* Ensure the PA branch doesn't find a stale tlb entry or stale code. */
ic iallu
tlbi alle2
dsb sy
isb
/* Branch into PA space */
adr x0, 1f
bfi x1, x0, #0, #PAGE_SHIFT
br x1
/* We're now in idmap, disable MMU */
1: mrs x0, sctlr_el2
mrs x0, sctlr_el2
ldr x1, =SCTLR_ELx_FLAGS
bic x0, x0, x1 // Clear SCTL_M and etc
msr sctlr_el2, x0
isb
/* Invalidate the old TLBs */
tlbi alle2
dsb sy
/* Install stub vectors */
adr_l x0, __hyp_stub_vectors
msr vbar_el2, x0

19
arch/arm64/kvm/hyp/entry.S
View file

@ -164,22 +164,3 @@ alternative_endif
eret
ENDPROC(__fpsimd_guest_restore)
/*
* When using the extended idmap, we don't have a trampoline page we can use
* while we switch pages tables during __kvm_hyp_reset. Accessing the idmap
* directly would be ideal, but if we're using the extended idmap then the
* idmap is located above HYP_PAGE_OFFSET, and the address will be masked by
* kvm_call_hyp using kern_hyp_va.
*
* x0: HYP boot pgd
* x1: HYP phys_idmap_start
*/
ENTRY(__extended_idmap_trampoline)
mov x4, x1
adr_l x3, __kvm_hyp_reset
/* insert __kvm_hyp_reset()s offset into phys_idmap_start */
bfi x4, x3, #0, #PAGE_SHIFT
br x4
ENDPROC(__extended_idmap_trampoline)

15
arch/arm64/kvm/hyp/hyp-entry.S
View file

@ -62,6 +62,21 @@ ENTRY(__vhe_hyp_call)
isb
ret
ENDPROC(__vhe_hyp_call)
/*
* Compute the idmap address of __kvm_hyp_reset based on the idmap
* start passed as a parameter, and jump there.
*
* x0: HYP phys_idmap_start
*/
ENTRY(__kvm_hyp_teardown)
mov x4, x0
adr_l x3, __kvm_hyp_reset
/* insert __kvm_hyp_reset()s offset into phys_idmap_start */
bfi x4, x3, #0, #PAGE_SHIFT
br x4
ENDPROC(__kvm_hyp_teardown)
el1_sync: // Guest trapped into EL2
save_x0_to_x3

11
arch/arm64/kvm/hyp/switch.c
View file

@ -299,9 +299,16 @@ static const char __hyp_panic_string[] = "HYP panic:\nPS:%08llx PC:%016llx ESR:%
static void __hyp_text __hyp_call_panic_nvhe(u64 spsr, u64 elr, u64 par)
{
unsigned long str_va = (unsigned long)__hyp_panic_string;
unsigned long str_va;
__hyp_do_panic(hyp_kern_va(str_va),
/*
* Force the panic string to be loaded from the literal pool,
* making sure it is a kernel address and not a PC-relative
* reference.
*/
asm volatile("ldr %0, =__hyp_panic_string" : "=r" (str_va));
__hyp_do_panic(str_va,
spsr, elr,
read_sysreg(esr_el2), read_sysreg_el2(far),
read_sysreg(hpfar_el2), par,

36
arch/arm64/kvm/reset.c
View file

@ -65,7 +65,7 @@ static bool cpu_has_32bit_el1(void)
* We currently assume that the number of HW registers is uniform
* across all CPUs (see cpuinfo_sanity_check).
*/
int kvm_arch_dev_ioctl_check_extension(long ext)
int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext)
{
int r;
@ -86,6 +86,12 @@ int kvm_arch_dev_ioctl_check_extension(long ext)
case KVM_CAP_VCPU_ATTRIBUTES:
r = 1;
break;
case KVM_CAP_MSI_DEVID:
if (!kvm)
r = -EINVAL;
else
r = kvm->arch.vgic.msis_require_devid;
break;
default:
r = 0;
}
@ -132,31 +138,3 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
/* Reset timer */
return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
}
extern char __hyp_idmap_text_start[];
unsigned long kvm_hyp_reset_entry(void)
{
if (!__kvm_cpu_uses_extended_idmap()) {
unsigned long offset;
/*
* Find the address of __kvm_hyp_reset() in the trampoline page.
* This is present in the running page tables, and the boot page
* tables, so we call the code here to start the trampoline
* dance in reverse.
*/
offset = (unsigned long)__kvm_hyp_reset
- ((unsigned long)__hyp_idmap_text_start & PAGE_MASK);
return TRAMPOLINE_VA + offset;
} else {
/*
* KVM is running with merged page tables, which don't have the
* trampoline page mapped. We know the idmap is still mapped,
* but can't be called into directly. Use
* __extended_idmap_trampoline to do the call.
*/
return (unsigned long)kvm_ksym_ref(__extended_idmap_trampoline);
}
}

4
arch/arm64/kvm/sys_regs.c
View file

@ -1546,7 +1546,7 @@ static void unhandled_cp_access(struct kvm_vcpu *vcpu,
struct sys_reg_params *params)
{
u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu);
int cp;
int cp = -1;
switch(hsr_ec) {
case ESR_ELx_EC_CP15_32:
@ -1558,7 +1558,7 @@ static void unhandled_cp_access(struct kvm_vcpu *vcpu,
cp = 14;
break;
default:
WARN_ON((cp = -1));
WARN_ON(1);
}
kvm_err("Unsupported guest CP%d access at: %08lx\n",

456
include/kvm/arm_vgic.h
View file

@ -1,6 +1,5 @@
/*
* Copyright (C) 2012 ARM Ltd.
* Author: Marc Zyngier <marc.zyngier@arm.com>
* Copyright (C) 2015, 2016 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@ -12,16 +11,10 @@
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ASM_ARM_KVM_VGIC_H
#define __ASM_ARM_KVM_VGIC_H
#ifdef CONFIG_KVM_NEW_VGIC
#include <kvm/vgic/vgic.h>
#else
#ifndef __KVM_ARM_VGIC_H
#define __KVM_ARM_VGIC_H
#include <linux/kernel.h>
#include <linux/kvm.h>
@ -29,248 +22,187 @@
#include <linux/spinlock.h>
#include <linux/types.h>
#include <kvm/iodev.h>
#include <linux/irqchip/arm-gic-common.h>
#include <linux/list.h>
#define VGIC_NR_IRQS_LEGACY 256
#define VGIC_V3_MAX_CPUS 255
#define VGIC_V2_MAX_CPUS 8
#define VGIC_NR_IRQS_LEGACY 256
#define VGIC_NR_SGIS 16
#define VGIC_NR_PPIS 16
#define VGIC_NR_PRIVATE_IRQS (VGIC_NR_SGIS + VGIC_NR_PPIS)
#define VGIC_V2_MAX_LRS (1 << 6)
#define VGIC_V3_MAX_LRS 16
#define VGIC_MAX_IRQS 1024
#define VGIC_V2_MAX_CPUS 8
#define VGIC_V3_MAX_CPUS 255
#if (VGIC_NR_IRQS_LEGACY & 31)
#error "VGIC_NR_IRQS must be a multiple of 32"
#endif
#if (VGIC_NR_IRQS_LEGACY > VGIC_MAX_IRQS)
#error "VGIC_NR_IRQS must be <= 1024"
#endif
/*
* The GIC distributor registers describing interrupts have two parts:
* - 32 per-CPU interrupts (SGI + PPI)
* - a bunch of shared interrupts (SPI)
*/
struct vgic_bitmap {
/*
* - One UL per VCPU for private interrupts (assumes UL is at
* least 32 bits)
* - As many UL as necessary for shared interrupts.
*
* The private interrupts are accessed via the "private"
* field, one UL per vcpu (the state for vcpu n is in
* private[n]). The shared interrupts are accessed via the
* "shared" pointer (IRQn state is at bit n-32 in the bitmap).
*/
unsigned long *private;
unsigned long *shared;
};
struct vgic_bytemap {
/*
* - 8 u32 per VCPU for private interrupts
* - As many u32 as necessary for shared interrupts.
*
* The private interrupts are accessed via the "private"
* field, (the state for vcpu n is in private[n*8] to
* private[n*8 + 7]). The shared interrupts are accessed via
* the "shared" pointer (IRQn state is at byte (n-32)%4 of the
* shared[(n-32)/4] word).
*/
u32 *private;
u32 *shared;
};
struct kvm_vcpu;
#define VGIC_MAX_PRIVATE (VGIC_NR_PRIVATE_IRQS - 1)
#define VGIC_MAX_SPI 1019
#define VGIC_MAX_RESERVED 1023
#define VGIC_MIN_LPI 8192
enum vgic_type {
VGIC_V2, /* Good ol' GICv2 */
VGIC_V3, /* New fancy GICv3 */
};
#define LR_STATE_PENDING (1 << 0)
#define LR_STATE_ACTIVE (1 << 1)
#define LR_STATE_MASK (3 << 0)
#define LR_EOI_INT (1 << 2)
#define LR_HW (1 << 3)
/* same for all guests, as depending only on the _host's_ GIC model */
struct vgic_global {
/* type of the host GIC */
enum vgic_type type;
struct vgic_lr {
unsigned irq:10;
union {
unsigned hwirq:10;
unsigned source:3;
};
unsigned state:4;
};
struct vgic_vmcr {
u32 ctlr;
u32 abpr;
u32 bpr;
u32 pmr;
};
struct vgic_ops {
struct vgic_lr (*get_lr)(const struct kvm_vcpu *, int);
void (*set_lr)(struct kvm_vcpu *, int, struct vgic_lr);
u64 (*get_elrsr)(const struct kvm_vcpu *vcpu);
u64 (*get_eisr)(const struct kvm_vcpu *vcpu);
void (*clear_eisr)(struct kvm_vcpu *vcpu);
u32 (*get_interrupt_status)(const struct kvm_vcpu *vcpu);
void (*enable_underflow)(struct kvm_vcpu *vcpu);
void (*disable_underflow)(struct kvm_vcpu *vcpu);
void (*get_vmcr)(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
void (*set_vmcr)(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
void (*enable)(struct kvm_vcpu *vcpu);
};
struct vgic_params {
/* vgic type */
enum vgic_type type;
/* Physical address of vgic virtual cpu interface */
phys_addr_t vcpu_base;
/* Number of list registers */
u32 nr_lr;
/* Interrupt number */
unsigned int maint_irq;
/* Virtual control interface base address */
void __iomem *vctrl_base;
int max_gic_vcpus;
phys_addr_t vcpu_base;
/* virtual control interface mapping */
void __iomem *vctrl_base;
/* Number of implemented list registers */
int nr_lr;
/* Maintenance IRQ number */
unsigned int maint_irq;
/* maximum number of VCPUs allowed (GICv2 limits us to 8) */
int max_gic_vcpus;
/* Only needed for the legacy KVM_CREATE_IRQCHIP */
bool can_emulate_gicv2;
bool can_emulate_gicv2;
};
struct vgic_vm_ops {
bool (*queue_sgi)(struct kvm_vcpu *, int irq);
void (*add_sgi_source)(struct kvm_vcpu *, int irq, int source);
int (*init_model)(struct kvm *);
int (*map_resources)(struct kvm *, const struct vgic_params *);
extern struct vgic_global kvm_vgic_global_state;
#define VGIC_V2_MAX_LRS (1 << 6)
#define VGIC_V3_MAX_LRS 16
#define VGIC_V3_LR_INDEX(lr) (VGIC_V3_MAX_LRS - 1 - lr)
enum vgic_irq_config {
VGIC_CONFIG_EDGE = 0,
VGIC_CONFIG_LEVEL
};
struct vgic_irq {
spinlock_t irq_lock; /* Protects the content of the struct */
struct list_head lpi_list; /* Used to link all LPIs together */
struct list_head ap_list;
struct kvm_vcpu *vcpu; /* SGIs and PPIs: The VCPU
* SPIs and LPIs: The VCPU whose ap_list
* this is queued on.
*/
struct kvm_vcpu *target_vcpu; /* The VCPU that this interrupt should
* be sent to, as a result of the
* targets reg (v2) or the
* affinity reg (v3).
*/
u32 intid; /* Guest visible INTID */
bool pending;
bool line_level; /* Level only */
bool soft_pending; /* Level only */
bool active; /* not used for LPIs */
bool enabled;
bool hw; /* Tied to HW IRQ */
struct kref refcount; /* Used for LPIs */
u32 hwintid; /* HW INTID number */
union {
u8 targets; /* GICv2 target VCPUs mask */
u32 mpidr; /* GICv3 target VCPU */
};
u8 source; /* GICv2 SGIs only */
u8 priority;
enum vgic_irq_config config; /* Level or edge */
};
struct vgic_register_region;
struct vgic_its;
enum iodev_type {
IODEV_CPUIF,
IODEV_DIST,
IODEV_REDIST,
IODEV_ITS
};
struct vgic_io_device {
gpa_t addr;
int len;
const struct vgic_io_range *reg_ranges;
struct kvm_vcpu *redist_vcpu;
gpa_t base_addr;
union {
struct kvm_vcpu *redist_vcpu;
struct vgic_its *its;
};
const struct vgic_register_region *regions;
enum iodev_type iodev_type;
int nr_regions;
struct kvm_io_device dev;
};
struct irq_phys_map {
u32 virt_irq;
u32 phys_irq;
};
struct vgic_its {
/* The base address of the ITS control register frame */
gpa_t vgic_its_base;
struct irq_phys_map_entry {
struct list_head entry;
struct rcu_head rcu;
struct irq_phys_map map;
bool enabled;
bool initialized;
struct vgic_io_device iodev;
struct kvm_device *dev;
/* These registers correspond to GITS_BASER{0,1} */
u64 baser_device_table;
u64 baser_coll_table;
/* Protects the command queue */
struct mutex cmd_lock;
u64 cbaser;
u32 creadr;
u32 cwriter;
/* Protects the device and collection lists */
struct mutex its_lock;
struct list_head device_list;
struct list_head collection_list;
};
struct vgic_dist {
spinlock_t lock;
bool in_kernel;
bool ready;
bool initialized;
/* vGIC model the kernel emulates for the guest (GICv2 or GICv3) */
u32 vgic_model;
int nr_cpus;
int nr_irqs;
/* Do injected MSIs require an additional device ID? */
bool msis_require_devid;
int nr_spis;
/* TODO: Consider moving to global state */
/* Virtual control interface mapping */
void __iomem *vctrl_base;
/* Distributor and vcpu interface mapping in the guest */
phys_addr_t vgic_dist_base;
/* GICv2 and GICv3 use different mapped register blocks */
/* base addresses in guest physical address space: */
gpa_t vgic_dist_base; /* distributor */
union {
phys_addr_t vgic_cpu_base;
phys_addr_t vgic_redist_base;
/* either a GICv2 CPU interface */
gpa_t vgic_cpu_base;
/* or a number of GICv3 redistributor regions */
gpa_t vgic_redist_base;
};
/* Distributor enabled */
u32 enabled;
/* distributor enabled */
bool enabled;
/* Interrupt enabled (one bit per IRQ) */
struct vgic_bitmap irq_enabled;
struct vgic_irq *spis;
/* Level-triggered interrupt external input is asserted */
struct vgic_bitmap irq_level;
/*
* Interrupt state is pending on the distributor
*/
struct vgic_bitmap irq_pending;
/*
* Tracks writes to GICD_ISPENDRn and GICD_ICPENDRn for level-triggered
* interrupts. Essentially holds the state of the flip-flop in
* Figure 4-10 on page 4-101 in ARM IHI 0048B.b.
* Once set, it is only cleared for level-triggered interrupts on
* guest ACKs (when we queue it) or writes to GICD_ICPENDRn.
*/
struct vgic_bitmap irq_soft_pend;
/* Level-triggered interrupt queued on VCPU interface */
struct vgic_bitmap irq_queued;
/* Interrupt was active when unqueue from VCPU interface */
struct vgic_bitmap irq_active;
/* Interrupt priority. Not used yet. */
struct vgic_bytemap irq_priority;
/* Level/edge triggered */
struct vgic_bitmap irq_cfg;
/*
* Source CPU per SGI and target CPU:
*
* Each byte represent a SGI observable on a VCPU, each bit of
* this byte indicating if the corresponding VCPU has
* generated this interrupt. This is a GICv2 feature only.
*
* For VCPUn (n < 8), irq_sgi_sources[n*16] to [n*16 + 15] are
* the SGIs observable on VCPUn.
*/
u8 *irq_sgi_sources;
/*
* Target CPU for each SPI:
*
* Array of available SPI, each byte indicating the target
* VCPU for SPI. IRQn (n >=32) is at irq_spi_cpu[n-32].
*/
u8 *irq_spi_cpu;
/*
* Reverse lookup of irq_spi_cpu for faster compute pending:
*
* Array of bitmaps, one per VCPU, describing if IRQn is
* routed to a particular VCPU.
*/
struct vgic_bitmap *irq_spi_target;
/* Target MPIDR for each IRQ (needed for GICv3 IROUTERn) only */
u32 *irq_spi_mpidr;
/* Bitmap indicating which CPU has something pending */
unsigned long *irq_pending_on_cpu;
/* Bitmap indicating which CPU has active IRQs */
unsigned long *irq_active_on_cpu;
struct vgic_vm_ops vm_ops;
struct vgic_io_device dist_iodev;
struct vgic_io_device *redist_iodevs;
/* Virtual irq to hwirq mapping */
spinlock_t irq_phys_map_lock;
struct list_head irq_phys_map_list;
bool has_its;
/*
* Contains the attributes and gpa of the LPI configuration table.
* Since we report GICR_TYPER.CommonLPIAff as 0b00, we can share
* one address across all redistributors.
* GICv3 spec: 6.1.2 "LPI Configuration tables"
*/
u64 propbaser;
/* Protects the lpi_list and the count value below. */
spinlock_t lpi_list_lock;
struct list_head lpi_list_head;
int lpi_list_count;
};
struct vgic_v2_cpu_if {
@ -298,78 +230,88 @@ struct vgic_v3_cpu_if {
};
struct vgic_cpu {
/* Pending/active/both interrupts on this VCPU */
DECLARE_BITMAP(pending_percpu, VGIC_NR_PRIVATE_IRQS);
DECLARE_BITMAP(active_percpu, VGIC_NR_PRIVATE_IRQS);
DECLARE_BITMAP(pend_act_percpu, VGIC_NR_PRIVATE_IRQS);
/* Pending/active/both shared interrupts, dynamically sized */
unsigned long *pending_shared;
unsigned long *active_shared;
unsigned long *pend_act_shared;
/* CPU vif control registers for world switch */
union {
struct vgic_v2_cpu_if vgic_v2;
struct vgic_v3_cpu_if vgic_v3;
};
/* Protected by the distributor's irq_phys_map_lock */
struct list_head irq_phys_map_list;
unsigned int used_lrs;
struct vgic_irq private_irqs[VGIC_NR_PRIVATE_IRQS];
u64 live_lrs;
spinlock_t ap_list_lock; /* Protects the ap_list */
/*
* List of IRQs that this VCPU should consider because they are either
* Active or Pending (hence the name; AP list), or because they recently
* were one of the two and need to be migrated off this list to another
* VCPU.
*/
struct list_head ap_list_head;
u64 live_lrs;
/*
* Members below are used with GICv3 emulation only and represent
* parts of the redistributor.
*/
struct vgic_io_device rd_iodev;
struct vgic_io_device sgi_iodev;
/* Contains the attributes and gpa of the LPI pending tables. */
u64 pendbaser;
bool lpis_enabled;
};
#define LR_EMPTY 0xff
#define INT_STATUS_EOI (1 << 0)
#define INT_STATUS_UNDERFLOW (1 << 1)
struct kvm;
struct kvm_vcpu;
int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
int kvm_vgic_hyp_init(void);
int kvm_vgic_map_resources(struct kvm *kvm);
int kvm_vgic_get_max_vcpus(void);
void kvm_vgic_early_init(struct kvm *kvm);
int kvm_vgic_create(struct kvm *kvm, u32 type);
void kvm_vgic_destroy(struct kvm *kvm);
void kvm_vgic_vcpu_early_init(struct kvm_vcpu *vcpu);
void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu);
void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu);
void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu);
int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int irq_num,
int kvm_vgic_map_resources(struct kvm *kvm);
int kvm_vgic_hyp_init(void);
int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
bool level);
int kvm_vgic_inject_mapped_irq(struct kvm *kvm, int cpuid,
unsigned int virt_irq, bool level);
void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg);
int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);
int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, int virt_irq, int phys_irq);
int kvm_vgic_inject_mapped_irq(struct kvm *kvm, int cpuid, unsigned int intid,
bool level);
int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, u32 virt_irq, u32 phys_irq);
int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int virt_irq);
bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int virt_irq);
int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);
#define irqchip_in_kernel(k) (!!((k)->arch.vgic.in_kernel))
#define vgic_initialized(k) (!!((k)->arch.vgic.nr_cpus))
#define vgic_initialized(k) ((k)->arch.vgic.initialized)
#define vgic_ready(k) ((k)->arch.vgic.ready)
#define vgic_valid_spi(k, i) (((i) >= VGIC_NR_PRIVATE_IRQS) && \
((i) < (k)->arch.vgic.nr_irqs))
((i) < (k)->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS))
bool kvm_vcpu_has_pending_irqs(struct kvm_vcpu *vcpu);
void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu);
void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu);
int vgic_v2_probe(const struct gic_kvm_info *gic_kvm_info,
const struct vgic_ops **ops,
const struct vgic_params **params);
#ifdef CONFIG_KVM_ARM_VGIC_V3
int vgic_v3_probe(const struct gic_kvm_info *gic_kvm_info,
const struct vgic_ops **ops,
const struct vgic_params **params);
void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg);
#else
static inline int vgic_v3_probe(const struct gic_kvm_info *gic_kvm_info,
const struct vgic_ops **ops,
const struct vgic_params **params)
static inline void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg)
{
return -ENODEV;
}
#endif
#endif /* old VGIC include */
#endif
/**
* kvm_vgic_get_max_vcpus - Get the maximum number of VCPUs allowed by HW
*
* The host's GIC naturally limits the maximum amount of VCPUs a guest
* can use.
*/
static inline int kvm_vgic_get_max_vcpus(void)
{
return kvm_vgic_global_state.max_gic_vcpus;
}
int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);
#endif /* __KVM_ARM_VGIC_H */

246
include/kvm/vgic/vgic.h
View file

@ -1,246 +0,0 @@
/*
* Copyright (C) 2015, 2016 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ASM_ARM_KVM_VGIC_VGIC_H
#define __ASM_ARM_KVM_VGIC_VGIC_H
#include <linux/kernel.h>
#include <linux/kvm.h>
#include <linux/irqreturn.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <kvm/iodev.h>
#define VGIC_V3_MAX_CPUS 255
#define VGIC_V2_MAX_CPUS 8
#define VGIC_NR_IRQS_LEGACY 256
#define VGIC_NR_SGIS 16
#define VGIC_NR_PPIS 16
#define VGIC_NR_PRIVATE_IRQS (VGIC_NR_SGIS + VGIC_NR_PPIS)
#define VGIC_MAX_PRIVATE (VGIC_NR_PRIVATE_IRQS - 1)
#define VGIC_MAX_SPI 1019
#define VGIC_MAX_RESERVED 1023
#define VGIC_MIN_LPI 8192
enum vgic_type {
VGIC_V2, /* Good ol' GICv2 */
VGIC_V3, /* New fancy GICv3 */
};
/* same for all guests, as depending only on the _host's_ GIC model */
struct vgic_global {
/* type of the host GIC */
enum vgic_type type;
/* Physical address of vgic virtual cpu interface */
phys_addr_t vcpu_base;
/* virtual control interface mapping */
void __iomem *vctrl_base;
/* Number of implemented list registers */
int nr_lr;
/* Maintenance IRQ number */
unsigned int maint_irq;
/* maximum number of VCPUs allowed (GICv2 limits us to 8) */
int max_gic_vcpus;
/* Only needed for the legacy KVM_CREATE_IRQCHIP */
bool can_emulate_gicv2;
};
extern struct vgic_global kvm_vgic_global_state;
#define VGIC_V2_MAX_LRS (1 << 6)
#define VGIC_V3_MAX_LRS 16
#define VGIC_V3_LR_INDEX(lr) (VGIC_V3_MAX_LRS - 1 - lr)
enum vgic_irq_config {
VGIC_CONFIG_EDGE = 0,
VGIC_CONFIG_LEVEL
};
struct vgic_irq {
spinlock_t irq_lock; /* Protects the content of the struct */
struct list_head ap_list;
struct kvm_vcpu *vcpu; /* SGIs and PPIs: The VCPU
* SPIs and LPIs: The VCPU whose ap_list
* this is queued on.
*/
struct kvm_vcpu *target_vcpu; /* The VCPU that this interrupt should
* be sent to, as a result of the
* targets reg (v2) or the
* affinity reg (v3).
*/
u32 intid; /* Guest visible INTID */
bool pending;
bool line_level; /* Level only */
bool soft_pending; /* Level only */
bool active; /* not used for LPIs */
bool enabled;
bool hw; /* Tied to HW IRQ */
u32 hwintid; /* HW INTID number */
union {
u8 targets; /* GICv2 target VCPUs mask */
u32 mpidr; /* GICv3 target VCPU */
};
u8 source; /* GICv2 SGIs only */
u8 priority;
enum vgic_irq_config config; /* Level or edge */
};
struct vgic_register_region;
struct vgic_io_device {
gpa_t base_addr;
struct kvm_vcpu *redist_vcpu;
const struct vgic_register_region *regions;
int nr_regions;
struct kvm_io_device dev;
};
struct vgic_dist {
bool in_kernel;
bool ready;
bool initialized;
/* vGIC model the kernel emulates for the guest (GICv2 or GICv3) */
u32 vgic_model;
int nr_spis;
/* TODO: Consider moving to global state */
/* Virtual control interface mapping */
void __iomem *vctrl_base;
/* base addresses in guest physical address space: */
gpa_t vgic_dist_base; /* distributor */
union {
/* either a GICv2 CPU interface */
gpa_t vgic_cpu_base;
/* or a number of GICv3 redistributor regions */
gpa_t vgic_redist_base;
};
/* distributor enabled */
bool enabled;
struct vgic_irq *spis;
struct vgic_io_device dist_iodev;
struct vgic_io_device *redist_iodevs;
};
struct vgic_v2_cpu_if {
u32 vgic_hcr;
u32 vgic_vmcr;
u32 vgic_misr; /* Saved only */
u64 vgic_eisr; /* Saved only */
u64 vgic_elrsr; /* Saved only */
u32 vgic_apr;
u32 vgic_lr[VGIC_V2_MAX_LRS];
};
struct vgic_v3_cpu_if {
#ifdef CONFIG_KVM_ARM_VGIC_V3
u32 vgic_hcr;
u32 vgic_vmcr;
u32 vgic_sre; /* Restored only, change ignored */
u32 vgic_misr; /* Saved only */
u32 vgic_eisr; /* Saved only */
u32 vgic_elrsr; /* Saved only */
u32 vgic_ap0r[4];
u32 vgic_ap1r[4];
u64 vgic_lr[VGIC_V3_MAX_LRS];
#endif
};
struct vgic_cpu {
/* CPU vif control registers for world switch */
union {
struct vgic_v2_cpu_if vgic_v2;
struct vgic_v3_cpu_if vgic_v3;
};
unsigned int used_lrs;
struct vgic_irq private_irqs[VGIC_NR_PRIVATE_IRQS];
spinlock_t ap_list_lock; /* Protects the ap_list */
/*
* List of IRQs that this VCPU should consider because they are either
* Active or Pending (hence the name; AP list), or because they recently
* were one of the two and need to be migrated off this list to another
* VCPU.
*/
struct list_head ap_list_head;
u64 live_lrs;
};
int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
void kvm_vgic_early_init(struct kvm *kvm);
int kvm_vgic_create(struct kvm *kvm, u32 type);
void kvm_vgic_destroy(struct kvm *kvm);
void kvm_vgic_vcpu_early_init(struct kvm_vcpu *vcpu);
void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu);
int kvm_vgic_map_resources(struct kvm *kvm);
int kvm_vgic_hyp_init(void);
int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
bool level);
int kvm_vgic_inject_mapped_irq(struct kvm *kvm, int cpuid, unsigned int intid,
bool level);
int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, u32 virt_irq, u32 phys_irq);
int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int virt_irq);
bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int virt_irq);
int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);
#define irqchip_in_kernel(k) (!!((k)->arch.vgic.in_kernel))
#define vgic_initialized(k) ((k)->arch.vgic.initialized)
#define vgic_ready(k) ((k)->arch.vgic.ready)
#define vgic_valid_spi(k, i) (((i) >= VGIC_NR_PRIVATE_IRQS) && \
((i) < (k)->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS))
bool kvm_vcpu_has_pending_irqs(struct kvm_vcpu *vcpu);
void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu);
void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu);
#ifdef CONFIG_KVM_ARM_VGIC_V3
void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg);
#else
static inline void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg)
{
}
#endif
/**
* kvm_vgic_get_max_vcpus - Get the maximum number of VCPUs allowed by HW
*
* The host's GIC naturally limits the maximum amount of VCPUs a guest
* can use.
*/
static inline int kvm_vgic_get_max_vcpus(void)
{
return kvm_vgic_global_state.max_gic_vcpus;
}
#endif /* __ASM_ARM_KVM_VGIC_VGIC_H */

208
include/linux/irqchip/arm-gic-v3.h
View file

@ -112,34 +112,76 @@
#define GICR_WAKER_ProcessorSleep (1U << 1)
#define GICR_WAKER_ChildrenAsleep (1U << 2)
#define GICR_PROPBASER_NonShareable (0U << 10)
#define GICR_PROPBASER_InnerShareable (1U << 10)
#define GICR_PROPBASER_OuterShareable (2U << 10)
#define GICR_PROPBASER_SHAREABILITY_MASK (3UL << 10)
#define GICR_PROPBASER_nCnB (0U << 7)
#define GICR_PROPBASER_nC (1U << 7)
#define GICR_PROPBASER_RaWt (2U << 7)
#define GICR_PROPBASER_RaWb (3U << 7)
#define GICR_PROPBASER_WaWt (4U << 7)
#define GICR_PROPBASER_WaWb (5U << 7)
#define GICR_PROPBASER_RaWaWt (6U << 7)
#define GICR_PROPBASER_RaWaWb (7U << 7)
#define GICR_PROPBASER_CACHEABILITY_MASK (7U << 7)
#define GICR_PROPBASER_IDBITS_MASK (0x1f)
#define GIC_BASER_CACHE_nCnB 0ULL
#define GIC_BASER_CACHE_SameAsInner 0ULL
#define GIC_BASER_CACHE_nC 1ULL
#define GIC_BASER_CACHE_RaWt 2ULL
#define GIC_BASER_CACHE_RaWb 3ULL
#define GIC_BASER_CACHE_WaWt 4ULL
#define GIC_BASER_CACHE_WaWb 5ULL
#define GIC_BASER_CACHE_RaWaWt 6ULL
#define GIC_BASER_CACHE_RaWaWb 7ULL
#define GIC_BASER_CACHE_MASK 7ULL
#define GIC_BASER_NonShareable 0ULL
#define GIC_BASER_InnerShareable 1ULL
#define GIC_BASER_OuterShareable 2ULL
#define GIC_BASER_SHAREABILITY_MASK 3ULL
#define GICR_PENDBASER_NonShareable (0U << 10)
#define GICR_PENDBASER_InnerShareable (1U << 10)
#define GICR_PENDBASER_OuterShareable (2U << 10)
#define GICR_PENDBASER_SHAREABILITY_MASK (3UL << 10)
#define GICR_PENDBASER_nCnB (0U << 7)
#define GICR_PENDBASER_nC (1U << 7)
#define GICR_PENDBASER_RaWt (2U << 7)
#define GICR_PENDBASER_RaWb (3U << 7)
#define GICR_PENDBASER_WaWt (4U << 7)
#define GICR_PENDBASER_WaWb (5U << 7)
#define GICR_PENDBASER_RaWaWt (6U << 7)
#define GICR_PENDBASER_RaWaWb (7U << 7)
#define GICR_PENDBASER_CACHEABILITY_MASK (7U << 7)
#define GIC_BASER_CACHEABILITY(reg, inner_outer, type) \
(GIC_BASER_CACHE_##type << reg##_##inner_outer##_CACHEABILITY_SHIFT)
#define GIC_BASER_SHAREABILITY(reg, type) \
(GIC_BASER_##type << reg##_SHAREABILITY_SHIFT)
#define GICR_PROPBASER_SHAREABILITY_SHIFT (10)
#define GICR_PROPBASER_INNER_CACHEABILITY_SHIFT (7)
#define GICR_PROPBASER_OUTER_CACHEABILITY_SHIFT (56)
#define GICR_PROPBASER_SHAREABILITY_MASK \
GIC_BASER_SHAREABILITY(GICR_PROPBASER, SHAREABILITY_MASK)
#define GICR_PROPBASER_INNER_CACHEABILITY_MASK \
GIC_BASER_CACHEABILITY(GICR_PROPBASER, INNER, MASK)
#define GICR_PROPBASER_OUTER_CACHEABILITY_MASK \
GIC_BASER_CACHEABILITY(GICR_PROPBASER, OUTER, MASK)
#define GICR_PROPBASER_CACHEABILITY_MASK GICR_PROPBASER_INNER_CACHEABILITY_MASK
#define GICR_PROPBASER_InnerShareable \
GIC_BASER_SHAREABILITY(GICR_PROPBASER, InnerShareable)
#define GICR_PROPBASER_nCnB GIC_BASER_CACHEABILITY(GICR_PROPBASER, INNER, nCnB)
#define GICR_PROPBASER_nC GIC_BASER_CACHEABILITY(GICR_PROPBASER, INNER, nC)
#define GICR_PROPBASER_RaWt GIC_BASER_CACHEABILITY(GICR_PROPBASER, INNER, RaWt)
#define GICR_PROPBASER_RaWb GIC_BASER_CACHEABILITY(GICR_PROPBASER, INNER, RaWt)
#define GICR_PROPBASER_WaWt GIC_BASER_CACHEABILITY(GICR_PROPBASER, INNER, WaWt)
#define GICR_PROPBASER_WaWb GIC_BASER_CACHEABILITY(GICR_PROPBASER, INNER, WaWb)
#define GICR_PROPBASER_RaWaWt GIC_BASER_CACHEABILITY(GICR_PROPBASER, INNER, RaWaWt)
#define GICR_PROPBASER_RaWaWb GIC_BASER_CACHEABILITY(GICR_PROPBASER, INNER, RaWaWb)
#define GICR_PROPBASER_IDBITS_MASK (0x1f)
#define GICR_PENDBASER_SHAREABILITY_SHIFT (10)
#define GICR_PENDBASER_INNER_CACHEABILITY_SHIFT (7)
#define GICR_PENDBASER_OUTER_CACHEABILITY_SHIFT (56)
#define GICR_PENDBASER_SHAREABILITY_MASK \
GIC_BASER_SHAREABILITY(GICR_PENDBASER, SHAREABILITY_MASK)
#define GICR_PENDBASER_INNER_CACHEABILITY_MASK \
GIC_BASER_CACHEABILITY(GICR_PENDBASER, INNER, MASK)
#define GICR_PENDBASER_OUTER_CACHEABILITY_MASK \
GIC_BASER_CACHEABILITY(GICR_PENDBASER, OUTER, MASK)
#define GICR_PENDBASER_CACHEABILITY_MASK GICR_PENDBASER_INNER_CACHEABILITY_MASK
#define GICR_PENDBASER_InnerShareable \
GIC_BASER_SHAREABILITY(GICR_PENDBASER, InnerShareable)
#define GICR_PENDBASER_nCnB GIC_BASER_CACHEABILITY(GICR_PENDBASER, INNER, nCnB)
#define GICR_PENDBASER_nC GIC_BASER_CACHEABILITY(GICR_PENDBASER, INNER, nC)
#define GICR_PENDBASER_RaWt GIC_BASER_CACHEABILITY(GICR_PENDBASER, INNER, RaWt)
#define GICR_PENDBASER_RaWb GIC_BASER_CACHEABILITY(GICR_PENDBASER, INNER, RaWt)
#define GICR_PENDBASER_WaWt GIC_BASER_CACHEABILITY(GICR_PENDBASER, INNER, WaWt)
#define GICR_PENDBASER_WaWb GIC_BASER_CACHEABILITY(GICR_PENDBASER, INNER, WaWb)
#define GICR_PENDBASER_RaWaWt GIC_BASER_CACHEABILITY(GICR_PENDBASER, INNER, RaWaWt)
#define GICR_PENDBASER_RaWaWb GIC_BASER_CACHEABILITY(GICR_PENDBASER, INNER, RaWaWb)
#define GICR_PENDBASER_PTZ BIT_ULL(62)
/*
* Re-Distributor registers, offsets from SGI_base
@ -175,59 +217,90 @@
#define GITS_CWRITER 0x0088
#define GITS_CREADR 0x0090
#define GITS_BASER 0x0100
#define GITS_IDREGS_BASE 0xffd0
#define GITS_PIDR0 0xffe0
#define GITS_PIDR1 0xffe4
#define GITS_PIDR2 GICR_PIDR2
#define GITS_PIDR4 0xffd0
#define GITS_CIDR0 0xfff0
#define GITS_CIDR1 0xfff4
#define GITS_CIDR2 0xfff8
#define GITS_CIDR3 0xfffc
#define GITS_TRANSLATER 0x10040
#define GITS_CTLR_ENABLE (1U << 0)
#define GITS_CTLR_QUIESCENT (1U << 31)
#define GITS_TYPER_PLPIS (1UL << 0)
#define GITS_TYPER_IDBITS_SHIFT 8
#define GITS_TYPER_DEVBITS_SHIFT 13
#define GITS_TYPER_DEVBITS(r) ((((r) >> GITS_TYPER_DEVBITS_SHIFT) & 0x1f) + 1)
#define GITS_TYPER_PTA (1UL << 19)
#define GITS_TYPER_HWCOLLCNT_SHIFT 24
#define GITS_CBASER_VALID (1UL << 63)
#define GITS_CBASER_nCnB (0UL << 59)
#define GITS_CBASER_nC (1UL << 59)
#define GITS_CBASER_RaWt (2UL << 59)
#define GITS_CBASER_RaWb (3UL << 59)
#define GITS_CBASER_WaWt (4UL << 59)
#define GITS_CBASER_WaWb (5UL << 59)
#define GITS_CBASER_RaWaWt (6UL << 59)
#define GITS_CBASER_RaWaWb (7UL << 59)
#define GITS_CBASER_CACHEABILITY_MASK (7UL << 59)
#define GITS_CBASER_NonShareable (0UL << 10)
#define GITS_CBASER_InnerShareable (1UL << 10)
#define GITS_CBASER_OuterShareable (2UL << 10)
#define GITS_CBASER_SHAREABILITY_MASK (3UL << 10)
#define GITS_CBASER_VALID (1UL << 63)
#define GITS_CBASER_SHAREABILITY_SHIFT (10)
#define GITS_CBASER_INNER_CACHEABILITY_SHIFT (59)
#define GITS_CBASER_OUTER_CACHEABILITY_SHIFT (53)
#define GITS_CBASER_SHAREABILITY_MASK \
GIC_BASER_SHAREABILITY(GITS_CBASER, SHAREABILITY_MASK)
#define GITS_CBASER_INNER_CACHEABILITY_MASK \
GIC_BASER_CACHEABILITY(GITS_CBASER, INNER, MASK)
#define GITS_CBASER_OUTER_CACHEABILITY_MASK \
GIC_BASER_CACHEABILITY(GITS_CBASER, OUTER, MASK)
#define GITS_CBASER_CACHEABILITY_MASK GITS_CBASER_INNER_CACHEABILITY_MASK
#define GITS_CBASER_InnerShareable \
GIC_BASER_SHAREABILITY(GITS_CBASER, InnerShareable)
#define GITS_CBASER_nCnB GIC_BASER_CACHEABILITY(GITS_CBASER, INNER, nCnB)
#define GITS_CBASER_nC GIC_BASER_CACHEABILITY(GITS_CBASER, INNER, nC)
#define GITS_CBASER_RaWt GIC_BASER_CACHEABILITY(GITS_CBASER, INNER, RaWt)
#define GITS_CBASER_RaWb GIC_BASER_CACHEABILITY(GITS_CBASER, INNER, RaWt)
#define GITS_CBASER_WaWt GIC_BASER_CACHEABILITY(GITS_CBASER, INNER, WaWt)
#define GITS_CBASER_WaWb GIC_BASER_CACHEABILITY(GITS_CBASER, INNER, WaWb)
#define GITS_CBASER_RaWaWt GIC_BASER_CACHEABILITY(GITS_CBASER, INNER, RaWaWt)
#define GITS_CBASER_RaWaWb GIC_BASER_CACHEABILITY(GITS_CBASER, INNER, RaWaWb)
#define GITS_BASER_NR_REGS 8
#define GITS_BASER_VALID (1UL << 63)
#define GITS_BASER_nCnB (0UL << 59)
#define GITS_BASER_nC (1UL << 59)
#define GITS_BASER_RaWt (2UL << 59)
#define GITS_BASER_RaWb (3UL << 59)
#define GITS_BASER_WaWt (4UL << 59)
#define GITS_BASER_WaWb (5UL << 59)
#define GITS_BASER_RaWaWt (6UL << 59)
#define GITS_BASER_RaWaWb (7UL << 59)
#define GITS_BASER_CACHEABILITY_MASK (7UL << 59)
#define GITS_BASER_TYPE_SHIFT (56)
#define GITS_BASER_VALID (1UL << 63)
#define GITS_BASER_INDIRECT (1ULL << 62)
#define GITS_BASER_INNER_CACHEABILITY_SHIFT (59)
#define GITS_BASER_OUTER_CACHEABILITY_SHIFT (53)
#define GITS_BASER_INNER_CACHEABILITY_MASK \
GIC_BASER_CACHEABILITY(GITS_BASER, INNER, MASK)
#define GITS_BASER_CACHEABILITY_MASK GITS_BASER_INNER_CACHEABILITY_MASK
#define GITS_BASER_OUTER_CACHEABILITY_MASK \
GIC_BASER_CACHEABILITY(GITS_BASER, OUTER, MASK)
#define GITS_BASER_SHAREABILITY_MASK \
GIC_BASER_SHAREABILITY(GITS_BASER, SHAREABILITY_MASK)
#define GITS_BASER_nCnB GIC_BASER_CACHEABILITY(GITS_BASER, INNER, nCnB)
#define GITS_BASER_nC GIC_BASER_CACHEABILITY(GITS_BASER, INNER, nC)
#define GITS_BASER_RaWt GIC_BASER_CACHEABILITY(GITS_BASER, INNER, RaWt)
#define GITS_BASER_RaWb GIC_BASER_CACHEABILITY(GITS_BASER, INNER, RaWt)
#define GITS_BASER_WaWt GIC_BASER_CACHEABILITY(GITS_BASER, INNER, WaWt)
#define GITS_BASER_WaWb GIC_BASER_CACHEABILITY(GITS_BASER, INNER, WaWb)
#define GITS_BASER_RaWaWt GIC_BASER_CACHEABILITY(GITS_BASER, INNER, RaWaWt)
#define GITS_BASER_RaWaWb GIC_BASER_CACHEABILITY(GITS_BASER, INNER, RaWaWb)
#define GITS_BASER_TYPE_SHIFT (56)
#define GITS_BASER_TYPE(r) (((r) >> GITS_BASER_TYPE_SHIFT) & 7)
#define GITS_BASER_ENTRY_SIZE_SHIFT (48)
#define GITS_BASER_ENTRY_SIZE_SHIFT (48)
#define GITS_BASER_ENTRY_SIZE(r) ((((r) >> GITS_BASER_ENTRY_SIZE_SHIFT) & 0xff) + 1)
#define GITS_BASER_NonShareable (0UL << 10)
#define GITS_BASER_InnerShareable (1UL << 10)
#define GITS_BASER_OuterShareable (2UL << 10)
#define GITS_BASER_SHAREABILITY_SHIFT (10)
#define GITS_BASER_SHAREABILITY_MASK (3UL << GITS_BASER_SHAREABILITY_SHIFT)
#define GITS_BASER_InnerShareable \
GIC_BASER_SHAREABILITY(GITS_BASER, InnerShareable)
#define GITS_BASER_PAGE_SIZE_SHIFT (8)
#define GITS_BASER_PAGE_SIZE_4K (0UL << GITS_BASER_PAGE_SIZE_SHIFT)
#define GITS_BASER_PAGE_SIZE_16K (1UL << GITS_BASER_PAGE_SIZE_SHIFT)
#define GITS_BASER_PAGE_SIZE_64K (2UL << GITS_BASER_PAGE_SIZE_SHIFT)
#define GITS_BASER_PAGE_SIZE_MASK (3UL << GITS_BASER_PAGE_SIZE_SHIFT)
#define GITS_BASER_PAGES_MAX 256
#define GITS_BASER_NR_PAGES(r) (((r) & 0xff) + 1)
#define GITS_BASER_TYPE_NONE 0
#define GITS_BASER_TYPE_DEVICE 1
@ -243,7 +316,10 @@
*/
#define GITS_CMD_MAPD 0x08
#define GITS_CMD_MAPC 0x09
#define GITS_CMD_MAPVI 0x0a
#define GITS_CMD_MAPTI 0x0a
/* older GIC documentation used MAPVI for this command */
#define GITS_CMD_MAPVI GITS_CMD_MAPTI
#define GITS_CMD_MAPI 0x0b
#define GITS_CMD_MOVI 0x01
#define GITS_CMD_DISCARD 0x0f
#define GITS_CMD_INV 0x0c
@ -253,6 +329,22 @@
#define GITS_CMD_CLEAR 0x04
#define GITS_CMD_SYNC 0x05
/*
* ITS error numbers
*/
#define E_ITS_MOVI_UNMAPPED_INTERRUPT 0x010107
#define E_ITS_MOVI_UNMAPPED_COLLECTION 0x010109
#define E_ITS_CLEAR_UNMAPPED_INTERRUPT 0x010507
#define E_ITS_MAPD_DEVICE_OOR 0x010801
#define E_ITS_MAPC_PROCNUM_OOR 0x010902
#define E_ITS_MAPC_COLLECTION_OOR 0x010903
#define E_ITS_MAPTI_UNMAPPED_DEVICE 0x010a04
#define E_ITS_MAPTI_PHYSICALID_OOR 0x010a06
#define E_ITS_INV_UNMAPPED_INTERRUPT 0x010c07
#define E_ITS_INVALL_UNMAPPED_COLLECTION 0x010d09
#define E_ITS_MOVALL_PROCNUM_OOR 0x010e01
#define E_ITS_DISCARD_UNMAPPED_INTERRUPT 0x010f07
/*
* CPU interface registers
*/

2
include/linux/kvm_host.h
View file

@ -164,6 +164,8 @@ int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
int len, struct kvm_io_device *dev);
int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
struct kvm_io_device *dev);
struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
gpa_t addr);
#ifdef CONFIG_KVM_ASYNC_PF
struct kvm_async_pf {

7
include/uapi/linux/kvm.h
View file

@ -868,6 +868,7 @@ struct kvm_ppc_smmu_info {
#define KVM_CAP_MAX_VCPU_ID 128
#define KVM_CAP_X2APIC_API 129
#define KVM_CAP_S390_USER_INSTR0 130
#define KVM_CAP_MSI_DEVID 131
#ifdef KVM_CAP_IRQ_ROUTING
@ -1026,12 +1027,14 @@ struct kvm_one_reg {
__u64 addr;
};
#define KVM_MSI_VALID_DEVID (1U << 0)
struct kvm_msi {
__u32 address_lo;
__u32 address_hi;
__u32 data;
__u32 flags;
__u8 pad[16];
__u32 devid;
__u8 pad[12];
};
struct kvm_arm_device_addr {
@ -1076,6 +1079,8 @@ enum kvm_device_type {
#define KVM_DEV_TYPE_FLIC KVM_DEV_TYPE_FLIC
KVM_DEV_TYPE_ARM_VGIC_V3,
#define KVM_DEV_TYPE_ARM_VGIC_V3 KVM_DEV_TYPE_ARM_VGIC_V3
KVM_DEV_TYPE_ARM_VGIC_ITS,
#define KVM_DEV_TYPE_ARM_VGIC_ITS KVM_DEV_TYPE_ARM_VGIC_ITS
KVM_DEV_TYPE_MAX,
};

15
virt/kvm/arm/hyp/vgic-v2-sr.c
View file

@ -21,18 +21,11 @@
#include <asm/kvm_hyp.h>
#ifdef CONFIG_KVM_NEW_VGIC
extern struct vgic_global kvm_vgic_global_state;
#define vgic_v2_params kvm_vgic_global_state
#else
extern struct vgic_params vgic_v2_params;
#endif
static void __hyp_text save_maint_int_state(struct kvm_vcpu *vcpu,
void __iomem *base)
{
struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
int nr_lr = (kern_hyp_va(&vgic_v2_params))->nr_lr;
int nr_lr = (kern_hyp_va(&kvm_vgic_global_state))->nr_lr;
u32 eisr0, eisr1;
int i;
bool expect_mi;
@ -74,7 +67,7 @@ static void __hyp_text save_maint_int_state(struct kvm_vcpu *vcpu,
static void __hyp_text save_elrsr(struct kvm_vcpu *vcpu, void __iomem *base)
{
struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
int nr_lr = (kern_hyp_va(&vgic_v2_params))->nr_lr;
int nr_lr = (kern_hyp_va(&kvm_vgic_global_state))->nr_lr;
u32 elrsr0, elrsr1;
elrsr0 = readl_relaxed(base + GICH_ELRSR0);
@ -93,7 +86,7 @@ static void __hyp_text save_elrsr(struct kvm_vcpu *vcpu, void __iomem *base)
static void __hyp_text save_lrs(struct kvm_vcpu *vcpu, void __iomem *base)
{
struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
int nr_lr = (kern_hyp_va(&vgic_v2_params))->nr_lr;
int nr_lr = (kern_hyp_va(&kvm_vgic_global_state))->nr_lr;
int i;
for (i = 0; i < nr_lr; i++) {
@ -147,7 +140,7 @@ void __hyp_text __vgic_v2_restore_state(struct kvm_vcpu *vcpu)
struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
struct vgic_dist *vgic = &kvm->arch.vgic;
void __iomem *base = kern_hyp_va(vgic->vctrl_base);
int nr_lr = (kern_hyp_va(&vgic_v2_params))->nr_lr;
int nr_lr = (kern_hyp_va(&kvm_vgic_global_state))->nr_lr;
int i;
u64 live_lrs = 0;

856
virt/kvm/arm/vgic-v2-emul.c
View file

@ -1,856 +0,0 @@
/*
* Contains GICv2 specific emulation code, was in vgic.c before.
*
* Copyright (C) 2012 ARM Ltd.
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/cpu.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/irqchip/arm-gic.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_mmu.h>
#include "vgic.h"
#define GICC_ARCH_VERSION_V2 0x2
static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg);
static u8 *vgic_get_sgi_sources(struct vgic_dist *dist, int vcpu_id, int sgi)
{
return dist->irq_sgi_sources + vcpu_id * VGIC_NR_SGIS + sgi;
}
static bool handle_mmio_misc(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio, phys_addr_t offset)
{
u32 reg;
u32 word_offset = offset & 3;
switch (offset & ~3) {
case 0: /* GICD_CTLR */
reg = vcpu->kvm->arch.vgic.enabled;
vgic_reg_access(mmio, &reg, word_offset,
ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
if (mmio->is_write) {
vcpu->kvm->arch.vgic.enabled = reg & 1;
vgic_update_state(vcpu->kvm);
return true;
}
break;
case 4: /* GICD_TYPER */
reg = (atomic_read(&vcpu->kvm->online_vcpus) - 1) << 5;
reg |= (vcpu->kvm->arch.vgic.nr_irqs >> 5) - 1;
vgic_reg_access(mmio, &reg, word_offset,
ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
break;
case 8: /* GICD_IIDR */
reg = (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0);
vgic_reg_access(mmio, &reg, word_offset,
ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
break;
}
return false;
}
static bool handle_mmio_set_enable_reg(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
return vgic_handle_enable_reg(vcpu->kvm, mmio, offset,
vcpu->vcpu_id, ACCESS_WRITE_SETBIT);
}
static bool handle_mmio_clear_enable_reg(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
return vgic_handle_enable_reg(vcpu->kvm, mmio, offset,
vcpu->vcpu_id, ACCESS_WRITE_CLEARBIT);
}
static bool handle_mmio_set_pending_reg(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
return vgic_handle_set_pending_reg(vcpu->kvm, mmio, offset,
vcpu->vcpu_id);
}
static bool handle_mmio_clear_pending_reg(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
return vgic_handle_clear_pending_reg(vcpu->kvm, mmio, offset,
vcpu->vcpu_id);
}
static bool handle_mmio_set_active_reg(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
return vgic_handle_set_active_reg(vcpu->kvm, mmio, offset,
vcpu->vcpu_id);
}
static bool handle_mmio_clear_active_reg(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
return vgic_handle_clear_active_reg(vcpu->kvm, mmio, offset,
vcpu->vcpu_id);
}
static bool handle_mmio_priority_reg(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
u32 *reg = vgic_bytemap_get_reg(&vcpu->kvm->arch.vgic.irq_priority,
vcpu->vcpu_id, offset);
vgic_reg_access(mmio, reg, offset,
ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
return false;
}
#define GICD_ITARGETSR_SIZE 32
#define GICD_CPUTARGETS_BITS 8
#define GICD_IRQS_PER_ITARGETSR (GICD_ITARGETSR_SIZE / GICD_CPUTARGETS_BITS)
static u32 vgic_get_target_reg(struct kvm *kvm, int irq)
{
struct vgic_dist *dist = &kvm->arch.vgic;
int i;
u32 val = 0;
irq -= VGIC_NR_PRIVATE_IRQS;
for (i = 0; i < GICD_IRQS_PER_ITARGETSR; i++)
val |= 1 << (dist->irq_spi_cpu[irq + i] + i * 8);
return val;
}
static void vgic_set_target_reg(struct kvm *kvm, u32 val, int irq)
{
struct vgic_dist *dist = &kvm->arch.vgic;
struct kvm_vcpu *vcpu;
int i, c;
unsigned long *bmap;
u32 target;
irq -= VGIC_NR_PRIVATE_IRQS;
/*
* Pick the LSB in each byte. This ensures we target exactly
* one vcpu per IRQ. If the byte is null, assume we target
* CPU0.
*/
for (i = 0; i < GICD_IRQS_PER_ITARGETSR; i++) {
int shift = i * GICD_CPUTARGETS_BITS;
target = ffs((val >> shift) & 0xffU);
target = target ? (target - 1) : 0;
dist->irq_spi_cpu[irq + i] = target;
kvm_for_each_vcpu(c, vcpu, kvm) {
bmap = vgic_bitmap_get_shared_map(&dist->irq_spi_target[c]);
if (c == target)
set_bit(irq + i, bmap);
else
clear_bit(irq + i, bmap);
}
}
}
static bool handle_mmio_target_reg(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
u32 reg;
/* We treat the banked interrupts targets as read-only */
if (offset < 32) {
u32 roreg;
roreg = 1 << vcpu->vcpu_id;
roreg |= roreg << 8;
roreg |= roreg << 16;
vgic_reg_access(mmio, &roreg, offset,
ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
return false;
}
reg = vgic_get_target_reg(vcpu->kvm, offset & ~3U);
vgic_reg_access(mmio, &reg, offset,
ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
if (mmio->is_write) {
vgic_set_target_reg(vcpu->kvm, reg, offset & ~3U);
vgic_update_state(vcpu->kvm);
return true;
}
return false;
}
static bool handle_mmio_cfg_reg(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio, phys_addr_t offset)
{
u32 *reg;
reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_cfg,
vcpu->vcpu_id, offset >> 1);
return vgic_handle_cfg_reg(reg, mmio, offset);
}
static bool handle_mmio_sgi_reg(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio, phys_addr_t offset)
{
u32 reg;
vgic_reg_access(mmio, &reg, offset,
ACCESS_READ_RAZ | ACCESS_WRITE_VALUE);
if (mmio->is_write) {
vgic_dispatch_sgi(vcpu, reg);
vgic_update_state(vcpu->kvm);
return true;
}
return false;
}
/* Handle reads of GICD_CPENDSGIRn and GICD_SPENDSGIRn */
static bool read_set_clear_sgi_pend_reg(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
int sgi;
int min_sgi = (offset & ~0x3);
int max_sgi = min_sgi + 3;
int vcpu_id = vcpu->vcpu_id;
u32 reg = 0;
/* Copy source SGIs from distributor side */
for (sgi = min_sgi; sgi <= max_sgi; sgi++) {
u8 sources = *vgic_get_sgi_sources(dist, vcpu_id, sgi);
reg |= ((u32)sources) << (8 * (sgi - min_sgi));
}
mmio_data_write(mmio, ~0, reg);
return false;
}
static bool write_set_clear_sgi_pend_reg(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset, bool set)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
int sgi;
int min_sgi = (offset & ~0x3);
int max_sgi = min_sgi + 3;
int vcpu_id = vcpu->vcpu_id;
u32 reg;
bool updated = false;
reg = mmio_data_read(mmio, ~0);
/* Clear pending SGIs on the distributor */
for (sgi = min_sgi; sgi <= max_sgi; sgi++) {
u8 mask = reg >> (8 * (sgi - min_sgi));
u8 *src = vgic_get_sgi_sources(dist, vcpu_id, sgi);
if (set) {
if ((*src & mask) != mask)
updated = true;
*src |= mask;
} else {
if (*src & mask)
updated = true;
*src &= ~mask;
}
}
if (updated)
vgic_update_state(vcpu->kvm);
return updated;
}
static bool handle_mmio_sgi_set(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
if (!mmio->is_write)
return read_set_clear_sgi_pend_reg(vcpu, mmio, offset);
else
return write_set_clear_sgi_pend_reg(vcpu, mmio, offset, true);
}
static bool handle_mmio_sgi_clear(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
if (!mmio->is_write)
return read_set_clear_sgi_pend_reg(vcpu, mmio, offset);
else
return write_set_clear_sgi_pend_reg(vcpu, mmio, offset, false);
}
static const struct vgic_io_range vgic_dist_ranges[] = {
{
.base = GIC_DIST_SOFTINT,
.len = 4,
.handle_mmio = handle_mmio_sgi_reg,
},
{
.base = GIC_DIST_CTRL,
.len = 12,
.bits_per_irq = 0,
.handle_mmio = handle_mmio_misc,
},
{
.base = GIC_DIST_IGROUP,
.len = VGIC_MAX_IRQS / 8,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_raz_wi,
},
{
.base = GIC_DIST_ENABLE_SET,
.len = VGIC_MAX_IRQS / 8,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_set_enable_reg,
},
{
.base = GIC_DIST_ENABLE_CLEAR,
.len = VGIC_MAX_IRQS / 8,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_clear_enable_reg,
},
{
.base = GIC_DIST_PENDING_SET,
.len = VGIC_MAX_IRQS / 8,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_set_pending_reg,
},
{
.base = GIC_DIST_PENDING_CLEAR,
.len = VGIC_MAX_IRQS / 8,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_clear_pending_reg,
},
{
.base = GIC_DIST_ACTIVE_SET,
.len = VGIC_MAX_IRQS / 8,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_set_active_reg,
},
{
.base = GIC_DIST_ACTIVE_CLEAR,
.len = VGIC_MAX_IRQS / 8,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_clear_active_reg,
},
{
.base = GIC_DIST_PRI,
.len = VGIC_MAX_IRQS,
.bits_per_irq = 8,
.handle_mmio = handle_mmio_priority_reg,
},
{
.base = GIC_DIST_TARGET,
.len = VGIC_MAX_IRQS,
.bits_per_irq = 8,
.handle_mmio = handle_mmio_target_reg,
},
{
.base = GIC_DIST_CONFIG,
.len = VGIC_MAX_IRQS / 4,
.bits_per_irq = 2,
.handle_mmio = handle_mmio_cfg_reg,
},
{
.base = GIC_DIST_SGI_PENDING_CLEAR,
.len = VGIC_NR_SGIS,
.handle_mmio = handle_mmio_sgi_clear,
},
{
.base = GIC_DIST_SGI_PENDING_SET,
.len = VGIC_NR_SGIS,
.handle_mmio = handle_mmio_sgi_set,
},
{}
};
static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg)
{
struct kvm *kvm = vcpu->kvm;
struct vgic_dist *dist = &kvm->arch.vgic;
int nrcpus = atomic_read(&kvm->online_vcpus);
u8 target_cpus;
int sgi, mode, c, vcpu_id;
vcpu_id = vcpu->vcpu_id;
sgi = reg & 0xf;
target_cpus = (reg >> 16) & 0xff;
mode = (reg >> 24) & 3;
switch (mode) {
case 0:
if (!target_cpus)
return;
break;
case 1:
target_cpus = ((1 << nrcpus) - 1) & ~(1 << vcpu_id) & 0xff;
break;
case 2:
target_cpus = 1 << vcpu_id;
break;
}
kvm_for_each_vcpu(c, vcpu, kvm) {
if (target_cpus & 1) {
/* Flag the SGI as pending */
vgic_dist_irq_set_pending(vcpu, sgi);
*vgic_get_sgi_sources(dist, c, sgi) |= 1 << vcpu_id;
kvm_debug("SGI%d from CPU%d to CPU%d\n",
sgi, vcpu_id, c);
}
target_cpus >>= 1;
}
}
static bool vgic_v2_queue_sgi(struct kvm_vcpu *vcpu, int irq)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
unsigned long sources;
int vcpu_id = vcpu->vcpu_id;
int c;
sources = *vgic_get_sgi_sources(dist, vcpu_id, irq);
for_each_set_bit(c, &sources, dist->nr_cpus) {
if (vgic_queue_irq(vcpu, c, irq))
clear_bit(c, &sources);
}
*vgic_get_sgi_sources(dist, vcpu_id, irq) = sources;
/*
* If the sources bitmap has been cleared it means that we
* could queue all the SGIs onto link registers (see the
* clear_bit above), and therefore we are done with them in
* our emulated gic and can get rid of them.
*/
if (!sources) {
vgic_dist_irq_clear_pending(vcpu, irq);
vgic_cpu_irq_clear(vcpu, irq);
return true;
}
return false;
}
/**
* kvm_vgic_map_resources - Configure global VGIC state before running any VCPUs
* @kvm: pointer to the kvm struct
*
* Map the virtual CPU interface into the VM before running any VCPUs. We
* can't do this at creation time, because user space must first set the
* virtual CPU interface address in the guest physical address space.
*/
static int vgic_v2_map_resources(struct kvm *kvm,
const struct vgic_params *params)
{
struct vgic_dist *dist = &kvm->arch.vgic;
int ret = 0;
if (!irqchip_in_kernel(kvm))
return 0;
mutex_lock(&kvm->lock);
if (vgic_ready(kvm))
goto out;
if (IS_VGIC_ADDR_UNDEF(dist->vgic_dist_base) ||
IS_VGIC_ADDR_UNDEF(dist->vgic_cpu_base)) {
kvm_err("Need to set vgic cpu and dist addresses first\n");
ret = -ENXIO;
goto out;
}
vgic_register_kvm_io_dev(kvm, dist->vgic_dist_base,
KVM_VGIC_V2_DIST_SIZE,
vgic_dist_ranges, -1, &dist->dist_iodev);
/*
* Initialize the vgic if this hasn't already been done on demand by
* accessing the vgic state from userspace.
*/
ret = vgic_init(kvm);
if (ret) {
kvm_err("Unable to allocate maps\n");
goto out_unregister;
}
ret = kvm_phys_addr_ioremap(kvm, dist->vgic_cpu_base,
params->vcpu_base, KVM_VGIC_V2_CPU_SIZE,
true);
if (ret) {
kvm_err("Unable to remap VGIC CPU to VCPU\n");
goto out_unregister;
}
dist->ready = true;
goto out;
out_unregister:
kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &dist->dist_iodev.dev);
out:
if (ret)
kvm_vgic_destroy(kvm);
mutex_unlock(&kvm->lock);
return ret;
}
static void vgic_v2_add_sgi_source(struct kvm_vcpu *vcpu, int irq, int source)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
*vgic_get_sgi_sources(dist, vcpu->vcpu_id, irq) |= 1 << source;
}
static int vgic_v2_init_model(struct kvm *kvm)
{
int i;
for (i = VGIC_NR_PRIVATE_IRQS; i < kvm->arch.vgic.nr_irqs; i += 4)
vgic_set_target_reg(kvm, 0, i);
return 0;
}
void vgic_v2_init_emulation(struct kvm *kvm)
{
struct vgic_dist *dist = &kvm->arch.vgic;
dist->vm_ops.queue_sgi = vgic_v2_queue_sgi;
dist->vm_ops.add_sgi_source = vgic_v2_add_sgi_source;
dist->vm_ops.init_model = vgic_v2_init_model;
dist->vm_ops.map_resources = vgic_v2_map_resources;
kvm->arch.max_vcpus = VGIC_V2_MAX_CPUS;
}
static bool handle_cpu_mmio_misc(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio, phys_addr_t offset)
{
bool updated = false;
struct vgic_vmcr vmcr;
u32 *vmcr_field;
u32 reg;
vgic_get_vmcr(vcpu, &vmcr);
switch (offset & ~0x3) {
case GIC_CPU_CTRL:
vmcr_field = &vmcr.ctlr;
break;
case GIC_CPU_PRIMASK:
vmcr_field = &vmcr.pmr;
break;
case GIC_CPU_BINPOINT:
vmcr_field = &vmcr.bpr;
break;
case GIC_CPU_ALIAS_BINPOINT:
vmcr_field = &vmcr.abpr;
break;
default:
BUG();
}
if (!mmio->is_write) {
reg = *vmcr_field;
mmio_data_write(mmio, ~0, reg);
} else {
reg = mmio_data_read(mmio, ~0);
if (reg != *vmcr_field) {
*vmcr_field = reg;
vgic_set_vmcr(vcpu, &vmcr);
updated = true;
}
}
return updated;
}
static bool handle_mmio_abpr(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio, phys_addr_t offset)
{
return handle_cpu_mmio_misc(vcpu, mmio, GIC_CPU_ALIAS_BINPOINT);
}
static bool handle_cpu_mmio_ident(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
u32 reg;
if (mmio->is_write)
return false;
/* GICC_IIDR */
reg = (PRODUCT_ID_KVM << 20) |
(GICC_ARCH_VERSION_V2 << 16) |
(IMPLEMENTER_ARM << 0);
mmio_data_write(mmio, ~0, reg);
return false;
}
/*
* CPU Interface Register accesses - these are not accessed by the VM, but by
* user space for saving and restoring VGIC state.
*/
static const struct vgic_io_range vgic_cpu_ranges[] = {
{
.base = GIC_CPU_CTRL,
.len = 12,
.handle_mmio = handle_cpu_mmio_misc,
},
{
.base = GIC_CPU_ALIAS_BINPOINT,
.len = 4,
.handle_mmio = handle_mmio_abpr,
},
{
.base = GIC_CPU_ACTIVEPRIO,
.len = 16,
.handle_mmio = handle_mmio_raz_wi,
},
{
.base = GIC_CPU_IDENT,
.len = 4,
.handle_mmio = handle_cpu_mmio_ident,
},
};
static int vgic_attr_regs_access(struct kvm_device *dev,
struct kvm_device_attr *attr,
u32 *reg, bool is_write)
{
const struct vgic_io_range *r = NULL, *ranges;
phys_addr_t offset;
int ret, cpuid, c;
struct kvm_vcpu *vcpu, *tmp_vcpu;
struct vgic_dist *vgic;
struct kvm_exit_mmio mmio;
u32 data;
offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
cpuid = (attr->attr & KVM_DEV_ARM_VGIC_CPUID_MASK) >>
KVM_DEV_ARM_VGIC_CPUID_SHIFT;
mutex_lock(&dev->kvm->lock);
ret = vgic_init(dev->kvm);
if (ret)
goto out;
if (cpuid >= atomic_read(&dev->kvm->online_vcpus)) {
ret = -EINVAL;
goto out;
}
vcpu = kvm_get_vcpu(dev->kvm, cpuid);
vgic = &dev->kvm->arch.vgic;
mmio.len = 4;
mmio.is_write = is_write;
mmio.data = &data;
if (is_write)
mmio_data_write(&mmio, ~0, *reg);
switch (attr->group) {
case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
mmio.phys_addr = vgic->vgic_dist_base + offset;
ranges = vgic_dist_ranges;
break;
case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
mmio.phys_addr = vgic->vgic_cpu_base + offset;
ranges = vgic_cpu_ranges;
break;
default:
BUG();
}
r = vgic_find_range(ranges, 4, offset);
if (unlikely(!r || !r->handle_mmio)) {
ret = -ENXIO;
goto out;
}
spin_lock(&vgic->lock);
/*
* Ensure that no other VCPU is running by checking the vcpu->cpu
* field. If no other VPCUs are running we can safely access the VGIC
* state, because even if another VPU is run after this point, that
* VCPU will not touch the vgic state, because it will block on
* getting the vgic->lock in kvm_vgic_sync_hwstate().
*/
kvm_for_each_vcpu(c, tmp_vcpu, dev->kvm) {
if (unlikely(tmp_vcpu->cpu != -1)) {
ret = -EBUSY;
goto out_vgic_unlock;
}
}
/*
* Move all pending IRQs from the LRs on all VCPUs so the pending
* state can be properly represented in the register state accessible
* through this API.
*/
kvm_for_each_vcpu(c, tmp_vcpu, dev->kvm)
vgic_unqueue_irqs(tmp_vcpu);
offset -= r->base;
r->handle_mmio(vcpu, &mmio, offset);
if (!is_write)
*reg = mmio_data_read(&mmio, ~0);
ret = 0;
out_vgic_unlock:
spin_unlock(&vgic->lock);
out:
mutex_unlock(&dev->kvm->lock);
return ret;
}
static int vgic_v2_create(struct kvm_device *dev, u32 type)
{
return kvm_vgic_create(dev->kvm, type);
}
static void vgic_v2_destroy(struct kvm_device *dev)
{
kfree(dev);
}
static int vgic_v2_set_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
int ret;
ret = vgic_set_common_attr(dev, attr);
if (ret != -ENXIO)
return ret;
switch (attr->group) {
case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: {
u32 __user *uaddr = (u32 __user *)(long)attr->addr;
u32 reg;
if (get_user(reg, uaddr))
return -EFAULT;
return vgic_attr_regs_access(dev, attr, &reg, true);
}
}
return -ENXIO;
}
static int vgic_v2_get_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
int ret;
ret = vgic_get_common_attr(dev, attr);
if (ret != -ENXIO)
return ret;
switch (attr->group) {
case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: {
u32 __user *uaddr = (u32 __user *)(long)attr->addr;
u32 reg = 0;
ret = vgic_attr_regs_access(dev, attr, &reg, false);
if (ret)
return ret;
return put_user(reg, uaddr);
}
}
return -ENXIO;
}
static int vgic_v2_has_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
phys_addr_t offset;
switch (attr->group) {
case KVM_DEV_ARM_VGIC_GRP_ADDR:
switch (attr->attr) {
case KVM_VGIC_V2_ADDR_TYPE_DIST:
case KVM_VGIC_V2_ADDR_TYPE_CPU:
return 0;
}
break;
case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
return vgic_has_attr_regs(vgic_dist_ranges, offset);
case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
return vgic_has_attr_regs(vgic_cpu_ranges, offset);
case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
return 0;
case KVM_DEV_ARM_VGIC_GRP_CTRL:
switch (attr->attr) {
case KVM_DEV_ARM_VGIC_CTRL_INIT:
return 0;
}
}
return -ENXIO;
}
struct kvm_device_ops kvm_arm_vgic_v2_ops = {
.name = "kvm-arm-vgic-v2",
.create = vgic_v2_create,
.destroy = vgic_v2_destroy,
.set_attr = vgic_v2_set_attr,
.get_attr = vgic_v2_get_attr,
.has_attr = vgic_v2_has_attr,
};

274
virt/kvm/arm/vgic-v2.c
View file

@ -1,274 +0,0 @@
/*
* Copyright (C) 2012,2013 ARM Limited, All Rights Reserved.
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/cpu.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irqchip/arm-gic.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_mmu.h>
static struct vgic_lr vgic_v2_get_lr(const struct kvm_vcpu *vcpu, int lr)
{
struct vgic_lr lr_desc;
u32 val = vcpu->arch.vgic_cpu.vgic_v2.vgic_lr[lr];
lr_desc.irq = val & GICH_LR_VIRTUALID;
if (lr_desc.irq <= 15)
lr_desc.source = (val >> GICH_LR_PHYSID_CPUID_SHIFT) & 0x7;
else
lr_desc.source = 0;
lr_desc.state = 0;
if (val & GICH_LR_PENDING_BIT)
lr_desc.state |= LR_STATE_PENDING;
if (val & GICH_LR_ACTIVE_BIT)
lr_desc.state |= LR_STATE_ACTIVE;
if (val & GICH_LR_EOI)
lr_desc.state |= LR_EOI_INT;
if (val & GICH_LR_HW) {
lr_desc.state |= LR_HW;
lr_desc.hwirq = (val & GICH_LR_PHYSID_CPUID) >> GICH_LR_PHYSID_CPUID_SHIFT;
}
return lr_desc;
}
static void vgic_v2_set_lr(struct kvm_vcpu *vcpu, int lr,
struct vgic_lr lr_desc)
{
u32 lr_val;
lr_val = lr_desc.irq;
if (lr_desc.state & LR_STATE_PENDING)
lr_val |= GICH_LR_PENDING_BIT;
if (lr_desc.state & LR_STATE_ACTIVE)
lr_val |= GICH_LR_ACTIVE_BIT;
if (lr_desc.state & LR_EOI_INT)
lr_val |= GICH_LR_EOI;
if (lr_desc.state & LR_HW) {
lr_val |= GICH_LR_HW;
lr_val |= (u32)lr_desc.hwirq << GICH_LR_PHYSID_CPUID_SHIFT;
}
if (lr_desc.irq < VGIC_NR_SGIS)
lr_val |= (lr_desc.source << GICH_LR_PHYSID_CPUID_SHIFT);
vcpu->arch.vgic_cpu.vgic_v2.vgic_lr[lr] = lr_val;
if (!(lr_desc.state & LR_STATE_MASK))
vcpu->arch.vgic_cpu.vgic_v2.vgic_elrsr |= (1ULL << lr);
else
vcpu->arch.vgic_cpu.vgic_v2.vgic_elrsr &= ~(1ULL << lr);
}
static u64 vgic_v2_get_elrsr(const struct kvm_vcpu *vcpu)
{
return vcpu->arch.vgic_cpu.vgic_v2.vgic_elrsr;
}
static u64 vgic_v2_get_eisr(const struct kvm_vcpu *vcpu)
{
return vcpu->arch.vgic_cpu.vgic_v2.vgic_eisr;
}
static void vgic_v2_clear_eisr(struct kvm_vcpu *vcpu)
{
vcpu->arch.vgic_cpu.vgic_v2.vgic_eisr = 0;
}
static u32 vgic_v2_get_interrupt_status(const struct kvm_vcpu *vcpu)
{
u32 misr = vcpu->arch.vgic_cpu.vgic_v2.vgic_misr;
u32 ret = 0;
if (misr & GICH_MISR_EOI)
ret |= INT_STATUS_EOI;
if (misr & GICH_MISR_U)
ret |= INT_STATUS_UNDERFLOW;
return ret;
}
static void vgic_v2_enable_underflow(struct kvm_vcpu *vcpu)
{
vcpu->arch.vgic_cpu.vgic_v2.vgic_hcr |= GICH_HCR_UIE;
}
static void vgic_v2_disable_underflow(struct kvm_vcpu *vcpu)
{
vcpu->arch.vgic_cpu.vgic_v2.vgic_hcr &= ~GICH_HCR_UIE;
}
static void vgic_v2_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
{
u32 vmcr = vcpu->arch.vgic_cpu.vgic_v2.vgic_vmcr;
vmcrp->ctlr = (vmcr & GICH_VMCR_CTRL_MASK) >> GICH_VMCR_CTRL_SHIFT;
vmcrp->abpr = (vmcr & GICH_VMCR_ALIAS_BINPOINT_MASK) >> GICH_VMCR_ALIAS_BINPOINT_SHIFT;
vmcrp->bpr = (vmcr & GICH_VMCR_BINPOINT_MASK) >> GICH_VMCR_BINPOINT_SHIFT;
vmcrp->pmr = (vmcr & GICH_VMCR_PRIMASK_MASK) >> GICH_VMCR_PRIMASK_SHIFT;
}
static void vgic_v2_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
{
u32 vmcr;
vmcr = (vmcrp->ctlr << GICH_VMCR_CTRL_SHIFT) & GICH_VMCR_CTRL_MASK;
vmcr |= (vmcrp->abpr << GICH_VMCR_ALIAS_BINPOINT_SHIFT) & GICH_VMCR_ALIAS_BINPOINT_MASK;
vmcr |= (vmcrp->bpr << GICH_VMCR_BINPOINT_SHIFT) & GICH_VMCR_BINPOINT_MASK;
vmcr |= (vmcrp->pmr << GICH_VMCR_PRIMASK_SHIFT) & GICH_VMCR_PRIMASK_MASK;
vcpu->arch.vgic_cpu.vgic_v2.vgic_vmcr = vmcr;
}
static void vgic_v2_enable(struct kvm_vcpu *vcpu)
{
/*
* By forcing VMCR to zero, the GIC will restore the binary
* points to their reset values. Anything else resets to zero
* anyway.
*/
vcpu->arch.vgic_cpu.vgic_v2.vgic_vmcr = 0;
vcpu->arch.vgic_cpu.vgic_v2.vgic_elrsr = ~0;
/* Get the show on the road... */
vcpu->arch.vgic_cpu.vgic_v2.vgic_hcr = GICH_HCR_EN;
}
static const struct vgic_ops vgic_v2_ops = {
.get_lr = vgic_v2_get_lr,
.set_lr = vgic_v2_set_lr,
.get_elrsr = vgic_v2_get_elrsr,
.get_eisr = vgic_v2_get_eisr,
.clear_eisr = vgic_v2_clear_eisr,
.get_interrupt_status = vgic_v2_get_interrupt_status,
.enable_underflow = vgic_v2_enable_underflow,
.disable_underflow = vgic_v2_disable_underflow,
.get_vmcr = vgic_v2_get_vmcr,
.set_vmcr = vgic_v2_set_vmcr,
.enable = vgic_v2_enable,
};
struct vgic_params __section(.hyp.text) vgic_v2_params;
static void vgic_cpu_init_lrs(void *params)
{
struct vgic_params *vgic = params;
int i;
for (i = 0; i < vgic->nr_lr; i++)
writel_relaxed(0, vgic->vctrl_base + GICH_LR0 + (i * 4));
}
/**
* vgic_v2_probe - probe for a GICv2 compatible interrupt controller
* @gic_kvm_info: pointer to the GIC description
* @ops: address of a pointer to the GICv2 operations
* @params: address of a pointer to HW-specific parameters
*
* Returns 0 if a GICv2 has been found, with the low level operations
* in *ops and the HW parameters in *params. Returns an error code
* otherwise.
*/
int vgic_v2_probe(const struct gic_kvm_info *gic_kvm_info,
const struct vgic_ops **ops,
const struct vgic_params **params)
{
int ret;
struct vgic_params *vgic = &vgic_v2_params;
const struct resource *vctrl_res = &gic_kvm_info->vctrl;
const struct resource *vcpu_res = &gic_kvm_info->vcpu;
memset(vgic, 0, sizeof(*vgic));
if (!gic_kvm_info->maint_irq) {
kvm_err("error getting vgic maintenance irq\n");
ret = -ENXIO;
goto out;
}
vgic->maint_irq = gic_kvm_info->maint_irq;
if (!gic_kvm_info->vctrl.start) {
kvm_err("GICH not present in the firmware table\n");
ret = -ENXIO;
goto out;
}
vgic->vctrl_base = ioremap(gic_kvm_info->vctrl.start,
resource_size(&gic_kvm_info->vctrl));
if (!vgic->vctrl_base) {
kvm_err("Cannot ioremap GICH\n");
ret = -ENOMEM;
goto out;
}
vgic->nr_lr = readl_relaxed(vgic->vctrl_base + GICH_VTR);
vgic->nr_lr = (vgic->nr_lr & 0x3f) + 1;
ret = create_hyp_io_mappings(vgic->vctrl_base,
vgic->vctrl_base + resource_size(vctrl_res),
vctrl_res->start);
if (ret) {
kvm_err("Cannot map VCTRL into hyp\n");
goto out_unmap;
}
if (!PAGE_ALIGNED(vcpu_res->start)) {
kvm_err("GICV physical address 0x%llx not page aligned\n",
(unsigned long long)vcpu_res->start);
ret = -ENXIO;
goto out_unmap;
}
if (!PAGE_ALIGNED(resource_size(vcpu_res))) {
kvm_err("GICV size 0x%llx not a multiple of page size 0x%lx\n",
(unsigned long long)resource_size(vcpu_res),
PAGE_SIZE);
ret = -ENXIO;
goto out_unmap;
}
vgic->can_emulate_gicv2 = true;
kvm_register_device_ops(&kvm_arm_vgic_v2_ops, KVM_DEV_TYPE_ARM_VGIC_V2);
vgic->vcpu_base = vcpu_res->start;
kvm_info("GICH base=0x%llx, GICV base=0x%llx, IRQ=%d\n",
gic_kvm_info->vctrl.start, vgic->vcpu_base, vgic->maint_irq);
vgic->type = VGIC_V2;
vgic->max_gic_vcpus = VGIC_V2_MAX_CPUS;
on_each_cpu(vgic_cpu_init_lrs, vgic, 1);
*ops = &vgic_v2_ops;
*params = vgic;
goto out;
out_unmap:
iounmap(vgic->vctrl_base);
out:
return ret;
}

1074
virt/kvm/arm/vgic-v3-emul.c
View file

File diff suppressed because it is too large Load diff

279
virt/kvm/arm/vgic-v3.c
View file

@ -1,279 +0,0 @@
/*
* Copyright (C) 2013 ARM Limited, All Rights Reserved.
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/cpu.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irqchip/arm-gic-v3.h>
#include <linux/irqchip/arm-gic-common.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_mmu.h>
static u32 ich_vtr_el2;
static struct vgic_lr vgic_v3_get_lr(const struct kvm_vcpu *vcpu, int lr)
{
struct vgic_lr lr_desc;
u64 val = vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[lr];
if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3)
lr_desc.irq = val & ICH_LR_VIRTUAL_ID_MASK;
else
lr_desc.irq = val & GICH_LR_VIRTUALID;
lr_desc.source = 0;
if (lr_desc.irq <= 15 &&
vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2)
lr_desc.source = (val >> GICH_LR_PHYSID_CPUID_SHIFT) & 0x7;
lr_desc.state = 0;
if (val & ICH_LR_PENDING_BIT)
lr_desc.state |= LR_STATE_PENDING;
if (val & ICH_LR_ACTIVE_BIT)
lr_desc.state |= LR_STATE_ACTIVE;
if (val & ICH_LR_EOI)
lr_desc.state |= LR_EOI_INT;
if (val & ICH_LR_HW) {
lr_desc.state |= LR_HW;
lr_desc.hwirq = (val >> ICH_LR_PHYS_ID_SHIFT) & GENMASK(9, 0);
}
return lr_desc;
}
static void vgic_v3_set_lr(struct kvm_vcpu *vcpu, int lr,
struct vgic_lr lr_desc)
{
u64 lr_val;
lr_val = lr_desc.irq;
/*
* Currently all guest IRQs are Group1, as Group0 would result
* in a FIQ in the guest, which it wouldn't expect.
* Eventually we want to make this configurable, so we may revisit
* this in the future.
*/
switch (vcpu->kvm->arch.vgic.vgic_model) {
case KVM_DEV_TYPE_ARM_VGIC_V3:
lr_val |= ICH_LR_GROUP;
break;
case KVM_DEV_TYPE_ARM_VGIC_V2:
if (lr_desc.irq < VGIC_NR_SGIS)
lr_val |= (u32)lr_desc.source << GICH_LR_PHYSID_CPUID_SHIFT;
break;
default:
BUG();
}
if (lr_desc.state & LR_STATE_PENDING)
lr_val |= ICH_LR_PENDING_BIT;
if (lr_desc.state & LR_STATE_ACTIVE)
lr_val |= ICH_LR_ACTIVE_BIT;
if (lr_desc.state & LR_EOI_INT)
lr_val |= ICH_LR_EOI;
if (lr_desc.state & LR_HW) {
lr_val |= ICH_LR_HW;
lr_val |= ((u64)lr_desc.hwirq) << ICH_LR_PHYS_ID_SHIFT;
}
vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[lr] = lr_val;
if (!(lr_desc.state & LR_STATE_MASK))
vcpu->arch.vgic_cpu.vgic_v3.vgic_elrsr |= (1U << lr);
else
vcpu->arch.vgic_cpu.vgic_v3.vgic_elrsr &= ~(1U << lr);
}
static u64 vgic_v3_get_elrsr(const struct kvm_vcpu *vcpu)
{
return vcpu->arch.vgic_cpu.vgic_v3.vgic_elrsr;
}
static u64 vgic_v3_get_eisr(const struct kvm_vcpu *vcpu)
{
return vcpu->arch.vgic_cpu.vgic_v3.vgic_eisr;
}
static void vgic_v3_clear_eisr(struct kvm_vcpu *vcpu)
{
vcpu->arch.vgic_cpu.vgic_v3.vgic_eisr = 0;
}
static u32 vgic_v3_get_interrupt_status(const struct kvm_vcpu *vcpu)
{
u32 misr = vcpu->arch.vgic_cpu.vgic_v3.vgic_misr;
u32 ret = 0;
if (misr & ICH_MISR_EOI)
ret |= INT_STATUS_EOI;
if (misr & ICH_MISR_U)
ret |= INT_STATUS_UNDERFLOW;
return ret;
}
static void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
{
u32 vmcr = vcpu->arch.vgic_cpu.vgic_v3.vgic_vmcr;
vmcrp->ctlr = (vmcr & ICH_VMCR_CTLR_MASK) >> ICH_VMCR_CTLR_SHIFT;
vmcrp->abpr = (vmcr & ICH_VMCR_BPR1_MASK) >> ICH_VMCR_BPR1_SHIFT;
vmcrp->bpr = (vmcr & ICH_VMCR_BPR0_MASK) >> ICH_VMCR_BPR0_SHIFT;
vmcrp->pmr = (vmcr & ICH_VMCR_PMR_MASK) >> ICH_VMCR_PMR_SHIFT;
}
static void vgic_v3_enable_underflow(struct kvm_vcpu *vcpu)
{
vcpu->arch.vgic_cpu.vgic_v3.vgic_hcr |= ICH_HCR_UIE;
}
static void vgic_v3_disable_underflow(struct kvm_vcpu *vcpu)
{
vcpu->arch.vgic_cpu.vgic_v3.vgic_hcr &= ~ICH_HCR_UIE;
}
static void vgic_v3_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
{
u32 vmcr;
vmcr = (vmcrp->ctlr << ICH_VMCR_CTLR_SHIFT) & ICH_VMCR_CTLR_MASK;
vmcr |= (vmcrp->abpr << ICH_VMCR_BPR1_SHIFT) & ICH_VMCR_BPR1_MASK;
vmcr |= (vmcrp->bpr << ICH_VMCR_BPR0_SHIFT) & ICH_VMCR_BPR0_MASK;
vmcr |= (vmcrp->pmr << ICH_VMCR_PMR_SHIFT) & ICH_VMCR_PMR_MASK;
vcpu->arch.vgic_cpu.vgic_v3.vgic_vmcr = vmcr;
}
static void vgic_v3_enable(struct kvm_vcpu *vcpu)
{
struct vgic_v3_cpu_if *vgic_v3 = &vcpu->arch.vgic_cpu.vgic_v3;
/*
* By forcing VMCR to zero, the GIC will restore the binary
* points to their reset values. Anything else resets to zero
* anyway.
*/
vgic_v3->vgic_vmcr = 0;
vgic_v3->vgic_elrsr = ~0;
/*
* If we are emulating a GICv3, we do it in an non-GICv2-compatible
* way, so we force SRE to 1 to demonstrate this to the guest.
* This goes with the spec allowing the value to be RAO/WI.
*/
if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3)
vgic_v3->vgic_sre = ICC_SRE_EL1_SRE;
else
vgic_v3->vgic_sre = 0;
/* Get the show on the road... */
vgic_v3->vgic_hcr = ICH_HCR_EN;
}
static const struct vgic_ops vgic_v3_ops = {
.get_lr = vgic_v3_get_lr,
.set_lr = vgic_v3_set_lr,
.get_elrsr = vgic_v3_get_elrsr,
.get_eisr = vgic_v3_get_eisr,
.clear_eisr = vgic_v3_clear_eisr,
.get_interrupt_status = vgic_v3_get_interrupt_status,
.enable_underflow = vgic_v3_enable_underflow,
.disable_underflow = vgic_v3_disable_underflow,
.get_vmcr = vgic_v3_get_vmcr,
.set_vmcr = vgic_v3_set_vmcr,
.enable = vgic_v3_enable,
};
static struct vgic_params vgic_v3_params;
static void vgic_cpu_init_lrs(void *params)
{
kvm_call_hyp(__vgic_v3_init_lrs);
}
/**
* vgic_v3_probe - probe for a GICv3 compatible interrupt controller
* @gic_kvm_info: pointer to the GIC description
* @ops: address of a pointer to the GICv3 operations
* @params: address of a pointer to HW-specific parameters
*
* Returns 0 if a GICv3 has been found, with the low level operations
* in *ops and the HW parameters in *params. Returns an error code
* otherwise.
*/
int vgic_v3_probe(const struct gic_kvm_info *gic_kvm_info,
const struct vgic_ops **ops,
const struct vgic_params **params)
{
int ret = 0;
struct vgic_params *vgic = &vgic_v3_params;
const struct resource *vcpu_res = &gic_kvm_info->vcpu;
vgic->maint_irq = gic_kvm_info->maint_irq;
ich_vtr_el2 = kvm_call_hyp(__vgic_v3_get_ich_vtr_el2);
/*
* The ListRegs field is 5 bits, but there is a architectural
* maximum of 16 list registers. Just ignore bit 4...
*/
vgic->nr_lr = (ich_vtr_el2 & 0xf) + 1;
vgic->can_emulate_gicv2 = false;
if (!vcpu_res->start) {
kvm_info("GICv3: no GICV resource entry\n");
vgic->vcpu_base = 0;
} else if (!PAGE_ALIGNED(vcpu_res->start)) {
pr_warn("GICV physical address 0x%llx not page aligned\n",
(unsigned long long)vcpu_res->start);
vgic->vcpu_base = 0;
} else if (!PAGE_ALIGNED(resource_size(vcpu_res))) {
pr_warn("GICV size 0x%llx not a multiple of page size 0x%lx\n",
(unsigned long long)resource_size(vcpu_res),
PAGE_SIZE);
} else {
vgic->vcpu_base = vcpu_res->start;
vgic->can_emulate_gicv2 = true;
kvm_register_device_ops(&kvm_arm_vgic_v2_ops,
KVM_DEV_TYPE_ARM_VGIC_V2);
}
if (vgic->vcpu_base == 0)
kvm_info("disabling GICv2 emulation\n");
kvm_register_device_ops(&kvm_arm_vgic_v3_ops, KVM_DEV_TYPE_ARM_VGIC_V3);
vgic->vctrl_base = NULL;
vgic->type = VGIC_V3;
vgic->max_gic_vcpus = VGIC_V3_MAX_CPUS;
kvm_info("GICV base=0x%llx, IRQ=%d\n",
vgic->vcpu_base, vgic->maint_irq);
on_each_cpu(vgic_cpu_init_lrs, vgic, 1);
*ops = &vgic_v3_ops;
*params = vgic;
return ret;
}

2440
virt/kvm/arm/vgic.c
View file

File diff suppressed because it is too large Load diff

140
virt/kvm/arm/vgic.h
View file

@ -1,140 +0,0 @@
/*
* Copyright (C) 2012-2014 ARM Ltd.
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* Derived from virt/kvm/arm/vgic.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __KVM_VGIC_H__
#define __KVM_VGIC_H__
#include <kvm/iodev.h>
#define VGIC_ADDR_UNDEF (-1)
#define IS_VGIC_ADDR_UNDEF(_x) ((_x) == VGIC_ADDR_UNDEF)
#define PRODUCT_ID_KVM 0x4b /* ASCII code K */
#define IMPLEMENTER_ARM 0x43b
#define ACCESS_READ_VALUE (1 << 0)
#define ACCESS_READ_RAZ (0 << 0)
#define ACCESS_READ_MASK(x) ((x) & (1 << 0))
#define ACCESS_WRITE_IGNORED (0 << 1)
#define ACCESS_WRITE_SETBIT (1 << 1)
#define ACCESS_WRITE_CLEARBIT (2 << 1)
#define ACCESS_WRITE_VALUE (3 << 1)
#define ACCESS_WRITE_MASK(x) ((x) & (3 << 1))
#define VCPU_NOT_ALLOCATED ((u8)-1)
unsigned long *vgic_bitmap_get_shared_map(struct vgic_bitmap *x);
void vgic_update_state(struct kvm *kvm);
int vgic_init_common_maps(struct kvm *kvm);
u32 *vgic_bitmap_get_reg(struct vgic_bitmap *x, int cpuid, u32 offset);
u32 *vgic_bytemap_get_reg(struct vgic_bytemap *x, int cpuid, u32 offset);
void vgic_dist_irq_set_pending(struct kvm_vcpu *vcpu, int irq);
void vgic_dist_irq_clear_pending(struct kvm_vcpu *vcpu, int irq);
void vgic_cpu_irq_clear(struct kvm_vcpu *vcpu, int irq);
void vgic_bitmap_set_irq_val(struct vgic_bitmap *x, int cpuid,
int irq, int val);
void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
bool vgic_queue_irq(struct kvm_vcpu *vcpu, u8 sgi_source_id, int irq);
void vgic_unqueue_irqs(struct kvm_vcpu *vcpu);
struct kvm_exit_mmio {
phys_addr_t phys_addr;
void *data;
u32 len;
bool is_write;
void *private;
};
void vgic_reg_access(struct kvm_exit_mmio *mmio, u32 *reg,
phys_addr_t offset, int mode);
bool handle_mmio_raz_wi(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
phys_addr_t offset);
static inline
u32 mmio_data_read(struct kvm_exit_mmio *mmio, u32 mask)
{
return le32_to_cpu(*((u32 *)mmio->data)) & mask;
}
static inline
void mmio_data_write(struct kvm_exit_mmio *mmio, u32 mask, u32 value)
{
*((u32 *)mmio->data) = cpu_to_le32(value) & mask;
}
struct vgic_io_range {
phys_addr_t base;
unsigned long len;
int bits_per_irq;
bool (*handle_mmio)(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
phys_addr_t offset);
};
int vgic_register_kvm_io_dev(struct kvm *kvm, gpa_t base, int len,
const struct vgic_io_range *ranges,
int redist_id,
struct vgic_io_device *iodev);
static inline bool is_in_range(phys_addr_t addr, unsigned long len,
phys_addr_t baseaddr, unsigned long size)
{
return (addr >= baseaddr) && (addr + len <= baseaddr + size);
}
const
struct vgic_io_range *vgic_find_range(const struct vgic_io_range *ranges,
int len, gpa_t offset);
bool vgic_handle_enable_reg(struct kvm *kvm, struct kvm_exit_mmio *mmio,
phys_addr_t offset, int vcpu_id, int access);
bool vgic_handle_set_pending_reg(struct kvm *kvm, struct kvm_exit_mmio *mmio,
phys_addr_t offset, int vcpu_id);
bool vgic_handle_clear_pending_reg(struct kvm *kvm, struct kvm_exit_mmio *mmio,
phys_addr_t offset, int vcpu_id);
bool vgic_handle_set_active_reg(struct kvm *kvm,
struct kvm_exit_mmio *mmio,
phys_addr_t offset, int vcpu_id);
bool vgic_handle_clear_active_reg(struct kvm *kvm,
struct kvm_exit_mmio *mmio,
phys_addr_t offset, int vcpu_id);
bool vgic_handle_cfg_reg(u32 *reg, struct kvm_exit_mmio *mmio,
phys_addr_t offset);
void vgic_kick_vcpus(struct kvm *kvm);
int vgic_has_attr_regs(const struct vgic_io_range *ranges, phys_addr_t offset);
int vgic_set_common_attr(struct kvm_device *dev, struct kvm_device_attr *attr);
int vgic_get_common_attr(struct kvm_device *dev, struct kvm_device_attr *attr);
int vgic_init(struct kvm *kvm);
void vgic_v2_init_emulation(struct kvm *kvm);
void vgic_v3_init_emulation(struct kvm *kvm);
#endif

9
virt/kvm/arm/vgic/vgic-init.c
View file

@ -157,6 +157,9 @@ static int kvm_vgic_dist_init(struct kvm *kvm, unsigned int nr_spis)
struct kvm_vcpu *vcpu0 = kvm_get_vcpu(kvm, 0);
int i;
INIT_LIST_HEAD(&dist->lpi_list_head);
spin_lock_init(&dist->lpi_list_lock);
dist->spis = kcalloc(nr_spis, sizeof(struct vgic_irq), GFP_KERNEL);
if (!dist->spis)
return -ENOMEM;
@ -177,6 +180,7 @@ static int kvm_vgic_dist_init(struct kvm *kvm, unsigned int nr_spis)
spin_lock_init(&irq->irq_lock);
irq->vcpu = NULL;
irq->target_vcpu = vcpu0;
kref_init(&irq->refcount);
if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2)
irq->targets = 0;
else
@ -211,6 +215,7 @@ static void kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
irq->vcpu = NULL;
irq->target_vcpu = vcpu;
irq->targets = 1U << vcpu->vcpu_id;
kref_init(&irq->refcount);
if (vgic_irq_is_sgi(i)) {
/* SGIs */
irq->enabled = 1;
@ -253,6 +258,9 @@ int vgic_init(struct kvm *kvm)
if (ret)
goto out;
if (vgic_has_its(kvm))
dist->msis_require_devid = true;
kvm_for_each_vcpu(i, vcpu, kvm)
kvm_vgic_vcpu_init(vcpu);
@ -271,7 +279,6 @@ static void kvm_vgic_dist_destroy(struct kvm *kvm)
dist->initialized = false;
kfree(dist->spis);
kfree(dist->redist_iodevs);
dist->nr_spis = 0;
mutex_unlock(&kvm->lock);

1500
virt/kvm/arm/vgic/vgic-its.c Normal file
View file

File diff suppressed because it is too large Load diff

22
virt/kvm/arm/vgic/vgic-kvm-device.c
View file

@ -21,8 +21,8 @@
/* common helpers */
static int vgic_check_ioaddr(struct kvm *kvm, phys_addr_t *ioaddr,
phys_addr_t addr, phys_addr_t alignment)
int vgic_check_ioaddr(struct kvm *kvm, phys_addr_t *ioaddr,
phys_addr_t addr, phys_addr_t alignment)
{
if (addr & ~KVM_PHYS_MASK)
return -E2BIG;
@ -210,20 +210,27 @@ static void vgic_destroy(struct kvm_device *dev)
kfree(dev);
}
void kvm_register_vgic_device(unsigned long type)
int kvm_register_vgic_device(unsigned long type)
{
int ret = -ENODEV;
switch (type) {
case KVM_DEV_TYPE_ARM_VGIC_V2:
kvm_register_device_ops(&kvm_arm_vgic_v2_ops,
KVM_DEV_TYPE_ARM_VGIC_V2);
ret = kvm_register_device_ops(&kvm_arm_vgic_v2_ops,
KVM_DEV_TYPE_ARM_VGIC_V2);
break;
#ifdef CONFIG_KVM_ARM_VGIC_V3
case KVM_DEV_TYPE_ARM_VGIC_V3:
kvm_register_device_ops(&kvm_arm_vgic_v3_ops,
KVM_DEV_TYPE_ARM_VGIC_V3);
ret = kvm_register_device_ops(&kvm_arm_vgic_v3_ops,
KVM_DEV_TYPE_ARM_VGIC_V3);
if (ret)
break;
ret = kvm_vgic_register_its_device();
break;
#endif
}
return ret;
}
/** vgic_attr_regs_access: allows user space to read/write VGIC registers
@ -428,4 +435,3 @@ struct kvm_device_ops kvm_arm_vgic_v3_ops = {
};
#endif /* CONFIG_KVM_ARM_VGIC_V3 */

10
virt/kvm/arm/vgic/vgic-mmio-v2.c
View file

@ -102,6 +102,7 @@ static void vgic_mmio_write_sgir(struct kvm_vcpu *source_vcpu,
irq->source |= 1U << source_vcpu->vcpu_id;
vgic_queue_irq_unlock(source_vcpu->kvm, irq);
vgic_put_irq(source_vcpu->kvm, irq);
}
}
@ -116,6 +117,8 @@ static unsigned long vgic_mmio_read_target(struct kvm_vcpu *vcpu,
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
val |= (u64)irq->targets << (i * 8);
vgic_put_irq(vcpu->kvm, irq);
}
return val;
@ -143,6 +146,7 @@ static void vgic_mmio_write_target(struct kvm_vcpu *vcpu,
irq->target_vcpu = kvm_get_vcpu(vcpu->kvm, target);
spin_unlock(&irq->irq_lock);
vgic_put_irq(vcpu->kvm, irq);
}
}
@ -157,6 +161,8 @@ static unsigned long vgic_mmio_read_sgipend(struct kvm_vcpu *vcpu,
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
val |= (u64)irq->source << (i * 8);
vgic_put_irq(vcpu->kvm, irq);
}
return val;
}
@ -178,6 +184,7 @@ static void vgic_mmio_write_sgipendc(struct kvm_vcpu *vcpu,
irq->pending = false;
spin_unlock(&irq->irq_lock);
vgic_put_irq(vcpu->kvm, irq);
}
}
@ -201,6 +208,7 @@ static void vgic_mmio_write_sgipends(struct kvm_vcpu *vcpu,
} else {
spin_unlock(&irq->irq_lock);
}
vgic_put_irq(vcpu->kvm, irq);
}
}
@ -429,6 +437,7 @@ int vgic_v2_cpuif_uaccess(struct kvm_vcpu *vcpu, bool is_write,
struct vgic_io_device dev = {
.regions = vgic_v2_cpu_registers,
.nr_regions = ARRAY_SIZE(vgic_v2_cpu_registers),
.iodev_type = IODEV_CPUIF,
};
return vgic_uaccess(vcpu, &dev, is_write, offset, val);
@ -440,6 +449,7 @@ int vgic_v2_dist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
struct vgic_io_device dev = {
.regions = vgic_v2_dist_registers,
.nr_regions = ARRAY_SIZE(vgic_v2_dist_registers),
.iodev_type = IODEV_DIST,
};
return vgic_uaccess(vcpu, &dev, is_write, offset, val);

247
virt/kvm/arm/vgic/vgic-mmio-v3.c
View file

@ -23,12 +23,35 @@
#include "vgic-mmio.h"
/* extract @num bytes at @offset bytes offset in data */
static unsigned long extract_bytes(unsigned long data, unsigned int offset,
unsigned int num)
unsigned long extract_bytes(unsigned long data, unsigned int offset,
unsigned int num)
{
return (data >> (offset * 8)) & GENMASK_ULL(num * 8 - 1, 0);
}
/* allows updates of any half of a 64-bit register (or the whole thing) */
u64 update_64bit_reg(u64 reg, unsigned int offset, unsigned int len,
unsigned long val)
{
int lower = (offset & 4) * 8;
int upper = lower + 8 * len - 1;
reg &= ~GENMASK_ULL(upper, lower);
val &= GENMASK_ULL(len * 8 - 1, 0);
return reg | ((u64)val << lower);
}
bool vgic_has_its(struct kvm *kvm)
{
struct vgic_dist *dist = &kvm->arch.vgic;
if (dist->vgic_model != KVM_DEV_TYPE_ARM_VGIC_V3)
return false;
return dist->has_its;
}
static unsigned long vgic_mmio_read_v3_misc(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len)
{
@ -43,7 +66,12 @@ static unsigned long vgic_mmio_read_v3_misc(struct kvm_vcpu *vcpu,
case GICD_TYPER:
value = vcpu->kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS;
value = (value >> 5) - 1;
value |= (INTERRUPT_ID_BITS_SPIS - 1) << 19;
if (vgic_has_its(vcpu->kvm)) {
value |= (INTERRUPT_ID_BITS_ITS - 1) << 19;
value |= GICD_TYPER_LPIS;
} else {
value |= (INTERRUPT_ID_BITS_SPIS - 1) << 19;
}
break;
case GICD_IIDR:
value = (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0);
@ -80,15 +108,17 @@ static unsigned long vgic_mmio_read_irouter(struct kvm_vcpu *vcpu,
{
int intid = VGIC_ADDR_TO_INTID(addr, 64);
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, NULL, intid);
unsigned long ret = 0;
if (!irq)
return 0;
/* The upper word is RAZ for us. */
if (addr & 4)
return 0;
if (!(addr & 4))
ret = extract_bytes(READ_ONCE(irq->mpidr), addr & 7, len);
return extract_bytes(READ_ONCE(irq->mpidr), addr & 7, len);
vgic_put_irq(vcpu->kvm, irq);
return ret;
}
static void vgic_mmio_write_irouter(struct kvm_vcpu *vcpu,
@ -96,15 +126,17 @@ static void vgic_mmio_write_irouter(struct kvm_vcpu *vcpu,
unsigned long val)
{
int intid = VGIC_ADDR_TO_INTID(addr, 64);
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, NULL, intid);
if (!irq)
return;
struct vgic_irq *irq;
/* The upper word is WI for us since we don't implement Aff3. */
if (addr & 4)
return;
irq = vgic_get_irq(vcpu->kvm, NULL, intid);
if (!irq)
return;
spin_lock(&irq->irq_lock);
/* We only care about and preserve Aff0, Aff1 and Aff2. */
@ -112,6 +144,32 @@ static void vgic_mmio_write_irouter(struct kvm_vcpu *vcpu,
irq->target_vcpu = kvm_mpidr_to_vcpu(vcpu->kvm, irq->mpidr);
spin_unlock(&irq->irq_lock);
vgic_put_irq(vcpu->kvm, irq);
}
static unsigned long vgic_mmio_read_v3r_ctlr(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
return vgic_cpu->lpis_enabled ? GICR_CTLR_ENABLE_LPIS : 0;
}
static void vgic_mmio_write_v3r_ctlr(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
bool was_enabled = vgic_cpu->lpis_enabled;
if (!vgic_has_its(vcpu->kvm))
return;
vgic_cpu->lpis_enabled = val & GICR_CTLR_ENABLE_LPIS;
if (!was_enabled && vgic_cpu->lpis_enabled)
vgic_enable_lpis(vcpu);
}
static unsigned long vgic_mmio_read_v3r_typer(struct kvm_vcpu *vcpu,
@ -125,6 +183,8 @@ static unsigned long vgic_mmio_read_v3r_typer(struct kvm_vcpu *vcpu,
value |= ((target_vcpu_id & 0xffff) << 8);
if (target_vcpu_id == atomic_read(&vcpu->kvm->online_vcpus) - 1)
value |= GICR_TYPER_LAST;
if (vgic_has_its(vcpu->kvm))
value |= GICR_TYPER_PLPIS;
return extract_bytes(value, addr & 7, len);
}
@ -147,6 +207,142 @@ static unsigned long vgic_mmio_read_v3_idregs(struct kvm_vcpu *vcpu,
return 0;
}
/* We want to avoid outer shareable. */
u64 vgic_sanitise_shareability(u64 field)
{
switch (field) {
case GIC_BASER_OuterShareable:
return GIC_BASER_InnerShareable;
default:
return field;
}
}
/* Avoid any inner non-cacheable mapping. */
u64 vgic_sanitise_inner_cacheability(u64 field)
{
switch (field) {
case GIC_BASER_CACHE_nCnB:
case GIC_BASER_CACHE_nC:
return GIC_BASER_CACHE_RaWb;
default:
return field;
}
}
/* Non-cacheable or same-as-inner are OK. */
u64 vgic_sanitise_outer_cacheability(u64 field)
{
switch (field) {
case GIC_BASER_CACHE_SameAsInner:
case GIC_BASER_CACHE_nC:
return field;
default:
return GIC_BASER_CACHE_nC;
}
}
u64 vgic_sanitise_field(u64 reg, u64 field_mask, int field_shift,
u64 (*sanitise_fn)(u64))
{
u64 field = (reg & field_mask) >> field_shift;
field = sanitise_fn(field) << field_shift;
return (reg & ~field_mask) | field;
}
#define PROPBASER_RES0_MASK \
(GENMASK_ULL(63, 59) | GENMASK_ULL(55, 52) | GENMASK_ULL(6, 5))
#define PENDBASER_RES0_MASK \
(BIT_ULL(63) | GENMASK_ULL(61, 59) | GENMASK_ULL(55, 52) | \
GENMASK_ULL(15, 12) | GENMASK_ULL(6, 0))
static u64 vgic_sanitise_pendbaser(u64 reg)
{
reg = vgic_sanitise_field(reg, GICR_PENDBASER_SHAREABILITY_MASK,
GICR_PENDBASER_SHAREABILITY_SHIFT,
vgic_sanitise_shareability);
reg = vgic_sanitise_field(reg, GICR_PENDBASER_INNER_CACHEABILITY_MASK,
GICR_PENDBASER_INNER_CACHEABILITY_SHIFT,
vgic_sanitise_inner_cacheability);
reg = vgic_sanitise_field(reg, GICR_PENDBASER_OUTER_CACHEABILITY_MASK,
GICR_PENDBASER_OUTER_CACHEABILITY_SHIFT,
vgic_sanitise_outer_cacheability);
reg &= ~PENDBASER_RES0_MASK;
reg &= ~GENMASK_ULL(51, 48);
return reg;
}
static u64 vgic_sanitise_propbaser(u64 reg)
{
reg = vgic_sanitise_field(reg, GICR_PROPBASER_SHAREABILITY_MASK,
GICR_PROPBASER_SHAREABILITY_SHIFT,
vgic_sanitise_shareability);
reg = vgic_sanitise_field(reg, GICR_PROPBASER_INNER_CACHEABILITY_MASK,
GICR_PROPBASER_INNER_CACHEABILITY_SHIFT,
vgic_sanitise_inner_cacheability);
reg = vgic_sanitise_field(reg, GICR_PROPBASER_OUTER_CACHEABILITY_MASK,
GICR_PROPBASER_OUTER_CACHEABILITY_SHIFT,
vgic_sanitise_outer_cacheability);
reg &= ~PROPBASER_RES0_MASK;
reg &= ~GENMASK_ULL(51, 48);
return reg;
}
static unsigned long vgic_mmio_read_propbase(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
return extract_bytes(dist->propbaser, addr & 7, len);
}
static void vgic_mmio_write_propbase(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
u64 propbaser = dist->propbaser;
/* Storing a value with LPIs already enabled is undefined */
if (vgic_cpu->lpis_enabled)
return;
propbaser = update_64bit_reg(propbaser, addr & 4, len, val);
propbaser = vgic_sanitise_propbaser(propbaser);
dist->propbaser = propbaser;
}
static unsigned long vgic_mmio_read_pendbase(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
return extract_bytes(vgic_cpu->pendbaser, addr & 7, len);
}
static void vgic_mmio_write_pendbase(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
u64 pendbaser = vgic_cpu->pendbaser;
/* Storing a value with LPIs already enabled is undefined */
if (vgic_cpu->lpis_enabled)
return;
pendbaser = update_64bit_reg(pendbaser, addr & 4, len, val);
pendbaser = vgic_sanitise_pendbaser(pendbaser);
vgic_cpu->pendbaser = pendbaser;
}
/*
* The GICv3 per-IRQ registers are split to control PPIs and SGIs in the
* redistributors, while SPIs are covered by registers in the distributor
@ -218,7 +414,7 @@ static const struct vgic_register_region vgic_v3_dist_registers[] = {
static const struct vgic_register_region vgic_v3_rdbase_registers[] = {
REGISTER_DESC_WITH_LENGTH(GICR_CTLR,
vgic_mmio_read_raz, vgic_mmio_write_wi, 4,
vgic_mmio_read_v3r_ctlr, vgic_mmio_write_v3r_ctlr, 4,
VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_LENGTH(GICR_IIDR,
vgic_mmio_read_v3r_iidr, vgic_mmio_write_wi, 4,
@ -227,10 +423,10 @@ static const struct vgic_register_region vgic_v3_rdbase_registers[] = {
vgic_mmio_read_v3r_typer, vgic_mmio_write_wi, 8,
VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_LENGTH(GICR_PROPBASER,
vgic_mmio_read_raz, vgic_mmio_write_wi, 8,
vgic_mmio_read_propbase, vgic_mmio_write_propbase, 8,
VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_LENGTH(GICR_PENDBASER,
vgic_mmio_read_raz, vgic_mmio_write_wi, 8,
vgic_mmio_read_pendbase, vgic_mmio_write_pendbase, 8,
VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_LENGTH(GICR_IDREGS,
vgic_mmio_read_v3_idregs, vgic_mmio_write_wi, 48,
@ -285,24 +481,18 @@ unsigned int vgic_v3_init_dist_iodev(struct vgic_io_device *dev)
int vgic_register_redist_iodevs(struct kvm *kvm, gpa_t redist_base_address)
{
int nr_vcpus = atomic_read(&kvm->online_vcpus);
struct kvm_vcpu *vcpu;
struct vgic_io_device *devices;
int c, ret = 0;
devices = kmalloc(sizeof(struct vgic_io_device) * nr_vcpus * 2,
GFP_KERNEL);
if (!devices)
return -ENOMEM;
kvm_for_each_vcpu(c, vcpu, kvm) {
gpa_t rd_base = redist_base_address + c * SZ_64K * 2;
gpa_t sgi_base = rd_base + SZ_64K;
struct vgic_io_device *rd_dev = &devices[c * 2];
struct vgic_io_device *sgi_dev = &devices[c * 2 + 1];
struct vgic_io_device *rd_dev = &vcpu->arch.vgic_cpu.rd_iodev;
struct vgic_io_device *sgi_dev = &vcpu->arch.vgic_cpu.sgi_iodev;
kvm_iodevice_init(&rd_dev->dev, &kvm_io_gic_ops);
rd_dev->base_addr = rd_base;
rd_dev->iodev_type = IODEV_REDIST;
rd_dev->regions = vgic_v3_rdbase_registers;
rd_dev->nr_regions = ARRAY_SIZE(vgic_v3_rdbase_registers);
rd_dev->redist_vcpu = vcpu;
@ -317,6 +507,7 @@ int vgic_register_redist_iodevs(struct kvm *kvm, gpa_t redist_base_address)
kvm_iodevice_init(&sgi_dev->dev, &kvm_io_gic_ops);
sgi_dev->base_addr = sgi_base;
sgi_dev->iodev_type = IODEV_REDIST;
sgi_dev->regions = vgic_v3_sgibase_registers;
sgi_dev->nr_regions = ARRAY_SIZE(vgic_v3_sgibase_registers);
sgi_dev->redist_vcpu = vcpu;
@ -335,14 +526,15 @@ int vgic_register_redist_iodevs(struct kvm *kvm, gpa_t redist_base_address)
if (ret) {
/* The current c failed, so we start with the previous one. */
for (c--; c >= 0; c--) {
struct vgic_cpu *vgic_cpu;
vcpu = kvm_get_vcpu(kvm, c);
vgic_cpu = &vcpu->arch.vgic_cpu;
kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS,
&devices[c * 2].dev);
&vgic_cpu->rd_iodev.dev);
kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS,
&devices[c * 2 + 1].dev);
&vgic_cpu->sgi_iodev.dev);
}
kfree(devices);
} else {
kvm->arch.vgic.redist_iodevs = devices;
}
return ret;
@ -451,5 +643,6 @@ void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg)
irq->pending = true;
vgic_queue_irq_unlock(vcpu->kvm, irq);
vgic_put_irq(vcpu->kvm, irq);
}
}

64
virt/kvm/arm/vgic/vgic-mmio.c
View file

@ -56,6 +56,8 @@ unsigned long vgic_mmio_read_enable(struct kvm_vcpu *vcpu,
if (irq->enabled)
value |= (1U << i);
vgic_put_irq(vcpu->kvm, irq);
}
return value;
@ -74,6 +76,8 @@ void vgic_mmio_write_senable(struct kvm_vcpu *vcpu,
spin_lock(&irq->irq_lock);
irq->enabled = true;
vgic_queue_irq_unlock(vcpu->kvm, irq);
vgic_put_irq(vcpu->kvm, irq);
}
}
@ -92,6 +96,7 @@ void vgic_mmio_write_cenable(struct kvm_vcpu *vcpu,
irq->enabled = false;
spin_unlock(&irq->irq_lock);
vgic_put_irq(vcpu->kvm, irq);
}
}
@ -108,6 +113,8 @@ unsigned long vgic_mmio_read_pending(struct kvm_vcpu *vcpu,
if (irq->pending)
value |= (1U << i);
vgic_put_irq(vcpu->kvm, irq);
}
return value;
@ -129,6 +136,7 @@ void vgic_mmio_write_spending(struct kvm_vcpu *vcpu,
irq->soft_pending = true;
vgic_queue_irq_unlock(vcpu->kvm, irq);
vgic_put_irq(vcpu->kvm, irq);
}
}
@ -152,6 +160,7 @@ void vgic_mmio_write_cpending(struct kvm_vcpu *vcpu,
}
spin_unlock(&irq->irq_lock);
vgic_put_irq(vcpu->kvm, irq);
}
}
@ -168,6 +177,8 @@ unsigned long vgic_mmio_read_active(struct kvm_vcpu *vcpu,
if (irq->active)
value |= (1U << i);
vgic_put_irq(vcpu->kvm, irq);
}
return value;
@ -242,6 +253,7 @@ void vgic_mmio_write_cactive(struct kvm_vcpu *vcpu,
for_each_set_bit(i, &val, len * 8) {
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
vgic_mmio_change_active(vcpu, irq, false);
vgic_put_irq(vcpu->kvm, irq);
}
vgic_change_active_finish(vcpu, intid);
}
@ -257,6 +269,7 @@ void vgic_mmio_write_sactive(struct kvm_vcpu *vcpu,
for_each_set_bit(i, &val, len * 8) {
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
vgic_mmio_change_active(vcpu, irq, true);
vgic_put_irq(vcpu->kvm, irq);
}
vgic_change_active_finish(vcpu, intid);
}
@ -272,6 +285,8 @@ unsigned long vgic_mmio_read_priority(struct kvm_vcpu *vcpu,
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
val |= (u64)irq->priority << (i * 8);
vgic_put_irq(vcpu->kvm, irq);
}
return val;
@ -298,6 +313,8 @@ void vgic_mmio_write_priority(struct kvm_vcpu *vcpu,
/* Narrow the priority range to what we actually support */
irq->priority = (val >> (i * 8)) & GENMASK(7, 8 - VGIC_PRI_BITS);
spin_unlock(&irq->irq_lock);
vgic_put_irq(vcpu->kvm, irq);
}
}
@ -313,6 +330,8 @@ unsigned long vgic_mmio_read_config(struct kvm_vcpu *vcpu,
if (irq->config == VGIC_CONFIG_EDGE)
value |= (2U << (i * 2));
vgic_put_irq(vcpu->kvm, irq);
}
return value;
@ -326,7 +345,7 @@ void vgic_mmio_write_config(struct kvm_vcpu *vcpu,
int i;
for (i = 0; i < len * 4; i++) {
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
struct vgic_irq *irq;
/*
* The configuration cannot be changed for SGIs in general,
@ -337,14 +356,18 @@ void vgic_mmio_write_config(struct kvm_vcpu *vcpu,
if (intid + i < VGIC_NR_PRIVATE_IRQS)
continue;
irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
spin_lock(&irq->irq_lock);
if (test_bit(i * 2 + 1, &val)) {
irq->config = VGIC_CONFIG_EDGE;
} else {
irq->config = VGIC_CONFIG_LEVEL;
irq->pending = irq->line_level | irq->soft_pending;
}
spin_unlock(&irq->irq_lock);
vgic_put_irq(vcpu->kvm, irq);
}
}
@ -450,8 +473,7 @@ static int dispatch_mmio_read(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
{
struct vgic_io_device *iodev = kvm_to_vgic_iodev(dev);
const struct vgic_register_region *region;
struct kvm_vcpu *r_vcpu;
unsigned long data;
unsigned long data = 0;
region = vgic_find_mmio_region(iodev->regions, iodev->nr_regions,
addr - iodev->base_addr);
@ -460,8 +482,21 @@ static int dispatch_mmio_read(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
return 0;
}
r_vcpu = iodev->redist_vcpu ? iodev->redist_vcpu : vcpu;
data = region->read(r_vcpu, addr, len);
switch (iodev->iodev_type) {
case IODEV_CPUIF:
data = region->read(vcpu, addr, len);
break;
case IODEV_DIST:
data = region->read(vcpu, addr, len);
break;
case IODEV_REDIST:
data = region->read(iodev->redist_vcpu, addr, len);
break;
case IODEV_ITS:
data = region->its_read(vcpu->kvm, iodev->its, addr, len);
break;
}
vgic_data_host_to_mmio_bus(val, len, data);
return 0;
}
@ -471,7 +506,6 @@ static int dispatch_mmio_write(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
{
struct vgic_io_device *iodev = kvm_to_vgic_iodev(dev);
const struct vgic_register_region *region;
struct kvm_vcpu *r_vcpu;
unsigned long data = vgic_data_mmio_bus_to_host(val, len);
region = vgic_find_mmio_region(iodev->regions, iodev->nr_regions,
@ -482,8 +516,21 @@ static int dispatch_mmio_write(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
if (!check_region(region, addr, len))
return 0;
r_vcpu = iodev->redist_vcpu ? iodev->redist_vcpu : vcpu;
region->write(r_vcpu, addr, len, data);
switch (iodev->iodev_type) {
case IODEV_CPUIF:
region->write(vcpu, addr, len, data);
break;
case IODEV_DIST:
region->write(vcpu, addr, len, data);
break;
case IODEV_REDIST:
region->write(iodev->redist_vcpu, addr, len, data);
break;
case IODEV_ITS:
region->its_write(vcpu->kvm, iodev->its, addr, len, data);
break;
}
return 0;
}
@ -513,6 +560,7 @@ int vgic_register_dist_iodev(struct kvm *kvm, gpa_t dist_base_address,
}
io_device->base_addr = dist_base_address;
io_device->iodev_type = IODEV_DIST;
io_device->redist_vcpu = NULL;
mutex_lock(&kvm->slots_lock);

31
virt/kvm/arm/vgic/vgic-mmio.h
View file

@ -21,10 +21,19 @@ struct vgic_register_region {
unsigned int len;
unsigned int bits_per_irq;
unsigned int access_flags;
unsigned long (*read)(struct kvm_vcpu *vcpu, gpa_t addr,
unsigned int len);
void (*write)(struct kvm_vcpu *vcpu, gpa_t addr, unsigned int len,
unsigned long val);
union {
unsigned long (*read)(struct kvm_vcpu *vcpu, gpa_t addr,
unsigned int len);
unsigned long (*its_read)(struct kvm *kvm, struct vgic_its *its,
gpa_t addr, unsigned int len);
};
union {
void (*write)(struct kvm_vcpu *vcpu, gpa_t addr,
unsigned int len, unsigned long val);
void (*its_write)(struct kvm *kvm, struct vgic_its *its,
gpa_t addr, unsigned int len,
unsigned long val);
};
};
extern struct kvm_io_device_ops kvm_io_gic_ops;
@ -87,6 +96,12 @@ unsigned long vgic_data_mmio_bus_to_host(const void *val, unsigned int len);
void vgic_data_host_to_mmio_bus(void *buf, unsigned int len,
unsigned long data);
unsigned long extract_bytes(unsigned long data, unsigned int offset,
unsigned int num);
u64 update_64bit_reg(u64 reg, unsigned int offset, unsigned int len,
unsigned long val);
unsigned long vgic_mmio_read_raz(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len);
@ -147,4 +162,12 @@ unsigned int vgic_v2_init_dist_iodev(struct vgic_io_device *dev);
unsigned int vgic_v3_init_dist_iodev(struct vgic_io_device *dev);
#ifdef CONFIG_KVM_ARM_VGIC_V3
u64 vgic_sanitise_outer_cacheability(u64 reg);
u64 vgic_sanitise_inner_cacheability(u64 reg);
u64 vgic_sanitise_shareability(u64 reg);
u64 vgic_sanitise_field(u64 reg, u64 field_mask, int field_shift,
u64 (*sanitise_fn)(u64));
#endif
#endif

12
virt/kvm/arm/vgic/vgic-v2.c
View file

@ -124,6 +124,7 @@ void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu)
}
spin_unlock(&irq->irq_lock);
vgic_put_irq(vcpu->kvm, irq);
}
}
@ -332,20 +333,25 @@ int vgic_v2_probe(const struct gic_kvm_info *info)
vtr = readl_relaxed(kvm_vgic_global_state.vctrl_base + GICH_VTR);
kvm_vgic_global_state.nr_lr = (vtr & 0x3f) + 1;
ret = kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V2);
if (ret) {
kvm_err("Cannot register GICv2 KVM device\n");
iounmap(kvm_vgic_global_state.vctrl_base);
return ret;
}
ret = create_hyp_io_mappings(kvm_vgic_global_state.vctrl_base,
kvm_vgic_global_state.vctrl_base +
resource_size(&info->vctrl),
info->vctrl.start);
if (ret) {
kvm_err("Cannot map VCTRL into hyp\n");
kvm_unregister_device_ops(KVM_DEV_TYPE_ARM_VGIC_V2);
iounmap(kvm_vgic_global_state.vctrl_base);
return ret;
}
kvm_vgic_global_state.can_emulate_gicv2 = true;
kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V2);
kvm_vgic_global_state.vcpu_base = info->vcpu.start;
kvm_vgic_global_state.type = VGIC_V2;
kvm_vgic_global_state.max_gic_vcpus = VGIC_V2_MAX_CPUS;

29
virt/kvm/arm/vgic/vgic-v3.c
View file

@ -81,6 +81,8 @@ void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu)
else
intid = val & GICH_LR_VIRTUALID;
irq = vgic_get_irq(vcpu->kvm, vcpu, intid);
if (!irq) /* An LPI could have been unmapped. */
continue;
spin_lock(&irq->irq_lock);
@ -113,6 +115,7 @@ void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu)
}
spin_unlock(&irq->irq_lock);
vgic_put_irq(vcpu->kvm, irq);
}
}
@ -190,6 +193,11 @@ void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
vmcrp->pmr = (vmcr & ICH_VMCR_PMR_MASK) >> ICH_VMCR_PMR_SHIFT;
}
#define INITIAL_PENDBASER_VALUE \
(GIC_BASER_CACHEABILITY(GICR_PENDBASER, INNER, RaWb) | \
GIC_BASER_CACHEABILITY(GICR_PENDBASER, OUTER, SameAsInner) | \
GIC_BASER_SHAREABILITY(GICR_PENDBASER, InnerShareable))
void vgic_v3_enable(struct kvm_vcpu *vcpu)
{
struct vgic_v3_cpu_if *vgic_v3 = &vcpu->arch.vgic_cpu.vgic_v3;
@ -207,10 +215,12 @@ void vgic_v3_enable(struct kvm_vcpu *vcpu)
* way, so we force SRE to 1 to demonstrate this to the guest.
* This goes with the spec allowing the value to be RAO/WI.
*/
if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3)
if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) {
vgic_v3->vgic_sre = ICC_SRE_EL1_SRE;
else
vcpu->arch.vgic_cpu.pendbaser = INITIAL_PENDBASER_VALUE;
} else {
vgic_v3->vgic_sre = 0;
}
/* Get the show on the road... */
vgic_v3->vgic_hcr = ICH_HCR_EN;
@ -296,6 +306,7 @@ out:
int vgic_v3_probe(const struct gic_kvm_info *info)
{
u32 ich_vtr_el2 = kvm_call_hyp(__vgic_v3_get_ich_vtr_el2);
int ret;
/*
* The ListRegs field is 5 bits, but there is a architectural
@ -319,12 +330,22 @@ int vgic_v3_probe(const struct gic_kvm_info *info)
} else {
kvm_vgic_global_state.vcpu_base = info->vcpu.start;
kvm_vgic_global_state.can_emulate_gicv2 = true;
kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V2);
ret = kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V2);
if (ret) {
kvm_err("Cannot register GICv2 KVM device.\n");
return ret;
}
kvm_info("vgic-v2@%llx\n", info->vcpu.start);
}
ret = kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V3);
if (ret) {
kvm_err("Cannot register GICv3 KVM device.\n");
kvm_unregister_device_ops(KVM_DEV_TYPE_ARM_VGIC_V2);
return ret;
}
if (kvm_vgic_global_state.vcpu_base == 0)
kvm_info("disabling GICv2 emulation\n");
kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V3);
kvm_vgic_global_state.vctrl_base = NULL;
kvm_vgic_global_state.type = VGIC_V3;

119
virt/kvm/arm/vgic/vgic.c
View file

@ -33,10 +33,17 @@ struct vgic_global __section(.hyp.text) kvm_vgic_global_state;
/*
* Locking order is always:
* vgic_cpu->ap_list_lock
* vgic_irq->irq_lock
* its->cmd_lock (mutex)
* its->its_lock (mutex)
* vgic_cpu->ap_list_lock
* kvm->lpi_list_lock
* vgic_irq->irq_lock
*
* (that is, always take the ap_list_lock before the struct vgic_irq lock).
* If you need to take multiple locks, always take the upper lock first,
* then the lower ones, e.g. first take the its_lock, then the irq_lock.
* If you are already holding a lock and need to take a higher one, you
* have to drop the lower ranking lock first and re-aquire it after having
* taken the upper one.
*
* When taking more than one ap_list_lock at the same time, always take the
* lowest numbered VCPU's ap_list_lock first, so:
@ -45,6 +52,41 @@ struct vgic_global __section(.hyp.text) kvm_vgic_global_state;
* spin_lock(vcpuY->arch.vgic_cpu.ap_list_lock);
*/
/*
* Iterate over the VM's list of mapped LPIs to find the one with a
* matching interrupt ID and return a reference to the IRQ structure.
*/
static struct vgic_irq *vgic_get_lpi(struct kvm *kvm, u32 intid)
{
struct vgic_dist *dist = &kvm->arch.vgic;
struct vgic_irq *irq = NULL;
spin_lock(&dist->lpi_list_lock);
list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) {
if (irq->intid != intid)
continue;
/*
* This increases the refcount, the caller is expected to
* call vgic_put_irq() later once it's finished with the IRQ.
*/
vgic_get_irq_kref(irq);
goto out_unlock;
}
irq = NULL;
out_unlock:
spin_unlock(&dist->lpi_list_lock);
return irq;
}
/*
* This looks up the virtual interrupt ID to get the corresponding
* struct vgic_irq. It also increases the refcount, so any caller is expected
* to call vgic_put_irq() once it's finished with this IRQ.
*/
struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,
u32 intid)
{
@ -56,14 +98,43 @@ struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,
if (intid <= VGIC_MAX_SPI)
return &kvm->arch.vgic.spis[intid - VGIC_NR_PRIVATE_IRQS];
/* LPIs are not yet covered */
/* LPIs */
if (intid >= VGIC_MIN_LPI)
return NULL;
return vgic_get_lpi(kvm, intid);
WARN(1, "Looking up struct vgic_irq for reserved INTID");
return NULL;
}
/*
* We can't do anything in here, because we lack the kvm pointer to
* lock and remove the item from the lpi_list. So we keep this function
* empty and use the return value of kref_put() to trigger the freeing.
*/
static void vgic_irq_release(struct kref *ref)
{
}
void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq)
{
struct vgic_dist *dist;
if (irq->intid < VGIC_MIN_LPI)
return;
if (!kref_put(&irq->refcount, vgic_irq_release))
return;
dist = &kvm->arch.vgic;
spin_lock(&dist->lpi_list_lock);
list_del(&irq->lpi_list);
dist->lpi_list_count--;
spin_unlock(&dist->lpi_list_lock);
kfree(irq);
}
/**
* kvm_vgic_target_oracle - compute the target vcpu for an irq
*
@ -236,6 +307,11 @@ retry:
goto retry;
}
/*
* Grab a reference to the irq to reflect the fact that it is
* now in the ap_list.
*/
vgic_get_irq_kref(irq);
list_add_tail(&irq->ap_list, &vcpu->arch.vgic_cpu.ap_list_head);
irq->vcpu = vcpu;
@ -269,14 +345,17 @@ static int vgic_update_irq_pending(struct kvm *kvm, int cpuid,
if (!irq)
return -EINVAL;
if (irq->hw != mapped_irq)
if (irq->hw != mapped_irq) {
vgic_put_irq(kvm, irq);
return -EINVAL;
}
spin_lock(&irq->irq_lock);
if (!vgic_validate_injection(irq, level)) {
/* Nothing to see here, move along... */
spin_unlock(&irq->irq_lock);
vgic_put_irq(kvm, irq);
return 0;
}
@ -288,6 +367,7 @@ static int vgic_update_irq_pending(struct kvm *kvm, int cpuid,
}
vgic_queue_irq_unlock(kvm, irq);
vgic_put_irq(kvm, irq);
return 0;
}
@ -330,25 +410,28 @@ int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, u32 virt_irq, u32 phys_irq)
irq->hwintid = phys_irq;
spin_unlock(&irq->irq_lock);
vgic_put_irq(vcpu->kvm, irq);
return 0;
}
int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int virt_irq)
{
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, virt_irq);
BUG_ON(!irq);
struct vgic_irq *irq;
if (!vgic_initialized(vcpu->kvm))
return -EAGAIN;
irq = vgic_get_irq(vcpu->kvm, vcpu, virt_irq);
BUG_ON(!irq);
spin_lock(&irq->irq_lock);
irq->hw = false;
irq->hwintid = 0;
spin_unlock(&irq->irq_lock);
vgic_put_irq(vcpu->kvm, irq);
return 0;
}
@ -386,6 +469,15 @@ retry:
list_del(&irq->ap_list);
irq->vcpu = NULL;
spin_unlock(&irq->irq_lock);
/*
* This vgic_put_irq call matches the
* vgic_get_irq_kref in vgic_queue_irq_unlock,
* where we added the LPI to the ap_list. As
* we remove the irq from the list, we drop
* also drop the refcount.
*/
vgic_put_irq(vcpu->kvm, irq);
continue;
}
@ -614,6 +706,15 @@ bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int virt_irq)
spin_lock(&irq->irq_lock);
map_is_active = irq->hw && irq->active;
spin_unlock(&irq->irq_lock);
vgic_put_irq(vcpu->kvm, irq);
return map_is_active;
}
int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi)
{
if (vgic_has_its(kvm))
return vgic_its_inject_msi(kvm, msi);
else
return -ENODEV;
}

38
virt/kvm/arm/vgic/vgic.h
View file

@ -25,6 +25,7 @@
#define IS_VGIC_ADDR_UNDEF(_x) ((_x) == VGIC_ADDR_UNDEF)
#define INTERRUPT_ID_BITS_SPIS 10
#define INTERRUPT_ID_BITS_ITS 16
#define VGIC_PRI_BITS 5
#define vgic_irq_is_sgi(intid) ((intid) < VGIC_NR_SGIS)
@ -38,9 +39,13 @@ struct vgic_vmcr {
struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,
u32 intid);
void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq);
bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq);
void vgic_kick_vcpus(struct kvm *kvm);
int vgic_check_ioaddr(struct kvm *kvm, phys_addr_t *ioaddr,
phys_addr_t addr, phys_addr_t alignment);
void vgic_v2_process_maintenance(struct kvm_vcpu *vcpu);
void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu);
void vgic_v2_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr);
@ -59,6 +64,14 @@ int vgic_v2_map_resources(struct kvm *kvm);
int vgic_register_dist_iodev(struct kvm *kvm, gpa_t dist_base_address,
enum vgic_type);
static inline void vgic_get_irq_kref(struct vgic_irq *irq)
{
if (irq->intid < VGIC_MIN_LPI)
return;
kref_get(&irq->refcount);
}
#ifdef CONFIG_KVM_ARM_VGIC_V3
void vgic_v3_process_maintenance(struct kvm_vcpu *vcpu);
void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu);
@ -71,6 +84,10 @@ void vgic_v3_enable(struct kvm_vcpu *vcpu);
int vgic_v3_probe(const struct gic_kvm_info *info);
int vgic_v3_map_resources(struct kvm *kvm);
int vgic_register_redist_iodevs(struct kvm *kvm, gpa_t dist_base_address);
bool vgic_has_its(struct kvm *kvm);
int kvm_vgic_register_its_device(void);
void vgic_enable_lpis(struct kvm_vcpu *vcpu);
int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi);
#else
static inline void vgic_v3_process_maintenance(struct kvm_vcpu *vcpu)
{
@ -122,9 +139,28 @@ static inline int vgic_register_redist_iodevs(struct kvm *kvm,
{
return -ENODEV;
}
static inline bool vgic_has_its(struct kvm *kvm)
{
return false;
}
static inline int kvm_vgic_register_its_device(void)
{
return -ENODEV;
}
static inline void vgic_enable_lpis(struct kvm_vcpu *vcpu)
{
}
static inline int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
{
return -ENODEV;
}
#endif
void kvm_register_vgic_device(unsigned long type);
int kvm_register_vgic_device(unsigned long type);
int vgic_lazy_init(struct kvm *kvm);
int vgic_init(struct kvm *kvm);

24
virt/kvm/kvm_main.c
View file

@ -3545,6 +3545,30 @@ int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
return r;
}
struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
gpa_t addr)
{
struct kvm_io_bus *bus;
int dev_idx, srcu_idx;
struct kvm_io_device *iodev = NULL;
srcu_idx = srcu_read_lock(&kvm->srcu);
bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1);
if (dev_idx < 0)
goto out_unlock;
iodev = bus->range[dev_idx].dev;
out_unlock:
srcu_read_unlock(&kvm->srcu, srcu_idx);
return iodev;
}
EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev);
static struct notifier_block kvm_cpu_notifier = {
.notifier_call = kvm_cpu_hotplug,
};