x86, apicv: add virtual interrupt delivery support

Virtual interrupt delivery avoids KVM to inject vAPIC interrupts
manually, which is fully taken care of by the hardware. This needs
some special awareness into existing interrupr injection path:

- for pending interrupt, instead of direct injection, we may need
  update architecture specific indicators before resuming to guest.

- A pending interrupt, which is masked by ISR, should be also
  considered in above update action, since hardware will decide
  when to inject it at right time. Current has_interrupt and
  get_interrupt only returns a valid vector from injection p.o.v.

Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>

2 files changed, 16 insertions, 0 deletions

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index d42c2839be98..635a74d22409 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -699,6 +699,10 @@ struct kvm_x86_ops {
         void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
         void (*enable_irq_window)(struct kvm_vcpu *vcpu);
         void (*update_cr8_intercept)(struct kvm_vcpu *vcpu, int tpr, int irr);
+        int (*vm_has_apicv)(struct kvm *kvm);
+        void (*hwapic_irr_update)(struct kvm_vcpu *vcpu, int max_irr);
+        void (*hwapic_isr_update)(struct kvm *kvm, int isr);
+        void (*load_eoi_exitmap)(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap);
         void (*set_virtual_x2apic_mode)(struct kvm_vcpu *vcpu, bool set);
         int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
         int (*get_tdp_level)(void);
@@ -994,6 +998,7 @@ int kvm_age_hva(struct kvm *kvm, unsigned long hva);
 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 int cpuid_maxphyaddr(struct kvm_vcpu *vcpu);
+int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v);
 int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu);
 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu);
 int kvm_cpu_get_interrupt(struct kvm_vcpu *v);
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 0a54df0b36fc..694586ca6456 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -62,6 +62,7 @@
 #define EXIT_REASON_MCE_DURING_VMENTRY  41
 #define EXIT_REASON_TPR_BELOW_THRESHOLD 43
 #define EXIT_REASON_APIC_ACCESS         44
+#define EXIT_REASON_EOI_INDUCED         45
 #define EXIT_REASON_EPT_VIOLATION       48
 #define EXIT_REASON_EPT_MISCONFIG       49
 #define EXIT_REASON_WBINVD              54
@@ -144,6 +145,7 @@
 #define SECONDARY_EXEC_WBINVD_EXITING           0x00000040
 #define SECONDARY_EXEC_UNRESTRICTED_GUEST       0x00000080
 #define SECONDARY_EXEC_APIC_REGISTER_VIRT       0x00000100
+#define SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY    0x00000200
 #define SECONDARY_EXEC_PAUSE_LOOP_EXITING       0x00000400
 #define SECONDARY_EXEC_ENABLE_INVPCID           0x00001000
 
@@ -181,6 +183,7 @@ enum vmcs_field {
         GUEST_GS_SELECTOR               = 0x0000080a,
         GUEST_LDTR_SELECTOR             = 0x0000080c,
         GUEST_TR_SELECTOR               = 0x0000080e,
+        GUEST_INTR_STATUS               = 0x00000810,
         HOST_ES_SELECTOR                = 0x00000c00,
         HOST_CS_SELECTOR                = 0x00000c02,
         HOST_SS_SELECTOR                = 0x00000c04,
@@ -208,6 +211,14 @@ enum vmcs_field {
         APIC_ACCESS_ADDR_HIGH           = 0x00002015,
         EPT_POINTER                     = 0x0000201a,
         EPT_POINTER_HIGH                = 0x0000201b,
+        EOI_EXIT_BITMAP0                = 0x0000201c,
+        EOI_EXIT_BITMAP0_HIGH           = 0x0000201d,
+        EOI_EXIT_BITMAP1                = 0x0000201e,
+        EOI_EXIT_BITMAP1_HIGH           = 0x0000201f,
+        EOI_EXIT_BITMAP2                = 0x00002020,
+        EOI_EXIT_BITMAP2_HIGH           = 0x00002021,
+        EOI_EXIT_BITMAP3                = 0x00002022,
+        EOI_EXIT_BITMAP3_HIGH           = 0x00002023,
         GUEST_PHYSICAL_ADDRESS          = 0x00002400,
         GUEST_PHYSICAL_ADDRESS_HIGH     = 0x00002401,
         VMCS_LINK_POINTER               = 0x00002800,