virt: acrn: Introduce interrupt injection interfaces

ACRN userspace need to inject virtual interrupts into a User VM in
devices emulation.

HSM needs provide interfaces to do so.

Introduce following interrupt injection interfaces:

ioctl ACRN_IOCTL_SET_IRQLINE:
  Pass data from userspace to the hypervisor, and inform the hypervisor
  to inject a virtual IOAPIC GSI interrupt to a User VM.

ioctl ACRN_IOCTL_INJECT_MSI:
  Pass data struct acrn_msi_entry from userspace to the hypervisor, and
  inform the hypervisor to inject a virtual MSI to a User VM.

ioctl ACRN_IOCTL_VM_INTR_MONITOR:
  Set a 4-Kbyte aligned shared page for statistics information of
  interrupts of a User VM.

Cc: Zhi Wang <[email protected]>
Cc: Zhenyu Wang <[email protected]>
Cc: Yu Wang <[email protected]>
Cc: Reinette Chatre <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Reviewed-by: Zhi Wang <[email protected]>
Reviewed-by: Reinette Chatre <[email protected]>
Signed-off-by: Shuo Liu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/uapi/linux/acrn.h b/include/uapi/linux/acrn.h
index b25ca8c33b92..b1c06b28ebdc 100644
--- a/include/uapi/linux/acrn.h
+++ b/include/uapi/linux/acrn.h
@@ -417,6 +417,16 @@ struct acrn_pcidev {
 	__u32	bar[ACRN_PCI_NUM_BARS];
 };
 
+/**
+ * struct acrn_msi_entry - Info for injecting a MSI interrupt to a VM
+ * @msi_addr:	MSI addr[19:12] with dest vCPU ID
+ * @msi_data:	MSI data[7:0] with vector
+ */
+struct acrn_msi_entry {
+	__u64	msi_addr;
+	__u64	msi_data;
+};
+
 /* The ioctl type, documented in ioctl-number.rst */
 #define ACRN_IOCTL_TYPE			0xA2
 
@@ -436,6 +446,13 @@ struct acrn_pcidev {
 #define ACRN_IOCTL_SET_VCPU_REGS	\
 	_IOW(ACRN_IOCTL_TYPE, 0x16, struct acrn_vcpu_regs)
 
+#define ACRN_IOCTL_INJECT_MSI		\
+	_IOW(ACRN_IOCTL_TYPE, 0x23, struct acrn_msi_entry)
+#define ACRN_IOCTL_VM_INTR_MONITOR	\
+	_IOW(ACRN_IOCTL_TYPE, 0x24, unsigned long)
+#define ACRN_IOCTL_SET_IRQLINE		\
+	_IOW(ACRN_IOCTL_TYPE, 0x25, __u64)
+
 #define ACRN_IOCTL_NOTIFY_REQUEST_FINISH \
 	_IOW(ACRN_IOCTL_TYPE, 0x31, struct acrn_ioreq_notify)
 #define ACRN_IOCTL_CREATE_IOREQ_CLIENT	\