diff options
| -rw-r--r-- | arch/arm64/include/asm/kvm_asm.h | 19 | ||||
| -rw-r--r-- | arch/arm64/kernel/vmlinux.lds.S | 8 | ||||
| -rw-r--r-- | arch/arm64/kvm/arm.c | 55 | ||||
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/hyp.lds.S | 6 | ||||
| -rw-r--r-- | arch/arm64/kvm/pmu.c | 5 |
5 files changed, 87 insertions, 6 deletions
diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h index 911d91787fa0..863f669d4dc8 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -66,8 +66,19 @@ #define CHOOSE_VHE_SYM(sym) sym #define CHOOSE_NVHE_SYM(sym) kvm_nvhe_sym(sym) -#define this_cpu_ptr_nvhe_sym(sym) this_cpu_ptr(&kvm_nvhe_sym(sym)) -#define per_cpu_ptr_nvhe_sym(sym, cpu) per_cpu_ptr(&kvm_nvhe_sym(sym), cpu) +/* + * Compute pointer to a symbol defined in nVHE percpu region. + * Returns NULL if percpu memory has not been allocated yet. + */ +#define this_cpu_ptr_nvhe_sym(sym) per_cpu_ptr_nvhe_sym(sym, smp_processor_id()) +#define per_cpu_ptr_nvhe_sym(sym, cpu) \ + ({ \ + unsigned long base, off; \ + base = kvm_arm_hyp_percpu_base[cpu]; \ + off = (unsigned long)&CHOOSE_NVHE_SYM(sym) - \ + (unsigned long)&CHOOSE_NVHE_SYM(__per_cpu_start); \ + base ? (typeof(CHOOSE_NVHE_SYM(sym))*)(base + off) : NULL; \ + }) #ifndef __KVM_NVHE_HYPERVISOR__ /* @@ -117,6 +128,10 @@ DECLARE_KVM_HYP_SYM(__kvm_hyp_vector); #define __kvm_hyp_init CHOOSE_NVHE_SYM(__kvm_hyp_init) #define __kvm_hyp_vector CHOOSE_HYP_SYM(__kvm_hyp_vector) +extern unsigned long kvm_arm_hyp_percpu_base[NR_CPUS]; +DECLARE_KVM_NVHE_SYM(__per_cpu_start); +DECLARE_KVM_NVHE_SYM(__per_cpu_end); + #ifdef CONFIG_KVM_INDIRECT_VECTORS extern atomic_t arm64_el2_vector_last_slot; DECLARE_KVM_HYP_SYM(__bp_harden_hyp_vecs); diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S index d14166012e51..d52e6b5dbfd3 100644 --- a/arch/arm64/kernel/vmlinux.lds.S +++ b/arch/arm64/kernel/vmlinux.lds.S @@ -28,8 +28,15 @@ jiffies = jiffies_64; __start___kvm_ex_table = .; \ *(__kvm_ex_table) \ __stop___kvm_ex_table = .; + +#define HYPERVISOR_PERCPU_SECTION \ + . = ALIGN(PAGE_SIZE); \ + HYP_SECTION_NAME(.data..percpu) : { \ + *(HYP_SECTION_NAME(.data..percpu)) \ + } #else /* CONFIG_KVM */ #define HYPERVISOR_EXTABLE +#define HYPERVISOR_PERCPU_SECTION #endif #define HYPERVISOR_TEXT \ @@ -195,6 +202,7 @@ SECTIONS } PERCPU_SECTION(L1_CACHE_BYTES) + HYPERVISOR_PERCPU_SECTION .rela.dyn : ALIGN(8) { *(.rela .rela*) diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index a9d6f095031d..35bed6b6d0a6 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -47,6 +47,7 @@ __asm__(".arch_extension virt"); #endif static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page); +unsigned long kvm_arm_hyp_percpu_base[NR_CPUS]; /* The VMID used in the VTTBR */ static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1); @@ -1255,6 +1256,19 @@ long kvm_arch_vm_ioctl(struct file *filp, } } +static unsigned long nvhe_percpu_size(void) +{ + return (unsigned long)CHOOSE_NVHE_SYM(__per_cpu_end) - + (unsigned long)CHOOSE_NVHE_SYM(__per_cpu_start); +} + +static unsigned long nvhe_percpu_order(void) +{ + unsigned long size = nvhe_percpu_size(); + + return size ? get_order(size) : 0; +} + static void cpu_init_hyp_mode(void) { phys_addr_t pgd_ptr; @@ -1270,8 +1284,8 @@ static void cpu_init_hyp_mode(void) * kernel's mapping to the linear mapping, and store it in tpidr_el2 * so that we can use adr_l to access per-cpu variables in EL2. */ - tpidr_el2 = ((unsigned long)this_cpu_ptr(&kvm_host_data) - - (unsigned long)kvm_ksym_ref(&kvm_host_data)); + tpidr_el2 = (unsigned long)this_cpu_ptr_nvhe_sym(__per_cpu_start) - + (unsigned long)kvm_ksym_ref(CHOOSE_NVHE_SYM(__per_cpu_start)); pgd_ptr = kvm_mmu_get_httbr(); hyp_stack_ptr = __this_cpu_read(kvm_arm_hyp_stack_page) + PAGE_SIZE; @@ -1461,8 +1475,10 @@ static void teardown_hyp_mode(void) int cpu; free_hyp_pgds(); - for_each_possible_cpu(cpu) + for_each_possible_cpu(cpu) { free_page(per_cpu(kvm_arm_hyp_stack_page, cpu)); + free_pages(kvm_arm_hyp_percpu_base[cpu], nvhe_percpu_order()); + } } /** @@ -1496,6 +1512,24 @@ static int init_hyp_mode(void) } /* + * Allocate and initialize pages for Hypervisor-mode percpu regions. + */ + for_each_possible_cpu(cpu) { + struct page *page; + void *page_addr; + + page = alloc_pages(GFP_KERNEL, nvhe_percpu_order()); + if (!page) { + err = -ENOMEM; + goto out_err; + } + + page_addr = page_address(page); + memcpy(page_addr, CHOOSE_NVHE_SYM(__per_cpu_start), nvhe_percpu_size()); + kvm_arm_hyp_percpu_base[cpu] = (unsigned long)page_addr; + } + + /* * Map the Hyp-code called directly from the host */ err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start), @@ -1539,6 +1573,21 @@ static int init_hyp_mode(void) } } + /* + * Map Hyp percpu pages + */ + for_each_possible_cpu(cpu) { + char *percpu_begin = (char *)kvm_arm_hyp_percpu_base[cpu]; + char *percpu_end = percpu_begin + nvhe_percpu_size(); + + err = create_hyp_mappings(percpu_begin, percpu_end, PAGE_HYP); + + if (err) { + kvm_err("Cannot map hyp percpu region\n"); + goto out_err; + } + } + for_each_possible_cpu(cpu) { kvm_host_data_t *cpu_data; diff --git a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S index 3b13d1c7cd1a..bb2d986ff696 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S +++ b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S @@ -7,7 +7,13 @@ */ #include <asm/hyp_image.h> +#include <asm-generic/vmlinux.lds.h> +#include <asm/cache.h> +#include <asm/memory.h> SECTIONS { HYP_SECTION(.text) + HYP_SECTION_NAME(.data..percpu) : { + PERCPU_INPUT(L1_CACHE_BYTES) + } } diff --git a/arch/arm64/kvm/pmu.c b/arch/arm64/kvm/pmu.c index c869c851d2dd..faf32a44ba04 100644 --- a/arch/arm64/kvm/pmu.c +++ b/arch/arm64/kvm/pmu.c @@ -33,7 +33,7 @@ void kvm_set_pmu_events(u32 set, struct perf_event_attr *attr) { struct kvm_host_data *ctx = this_cpu_ptr_hyp_sym(kvm_host_data); - if (!kvm_pmu_switch_needed(attr)) + if (!ctx || !kvm_pmu_switch_needed(attr)) return; if (!attr->exclude_host) @@ -49,6 +49,9 @@ void kvm_clr_pmu_events(u32 clr) { struct kvm_host_data *ctx = this_cpu_ptr_hyp_sym(kvm_host_data); + if (!ctx) + return; + ctx->pmu_events.events_host &= ~clr; ctx->pmu_events.events_guest &= ~clr; } |