User space (i.e. QEMU) should be able to check whether KVM
supports apic-v. User space will use this to decide whether enable
emulated MSR-based APIC (i.e. hyperv-vapic).
Signed-off-by: zhanghailiang <zhang.zhanghailiang@xxxxxxxxxx>
---
arch/x86/kvm/x86.c | 6 ++++++
include/uapi/linux/kvm.h | 1 +
2 files changed, 7 insertions(+)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0033df3..aad4437 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2775,6 +2775,12 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_TSC_DEADLINE_TIMER:
r = boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER);
break;
+ case KVM_CAP_VMX_APICV:
+ if (kvm)
+ r = kvm_apic_vid_enabled(kvm);
+ else
+ r = 0;
+ break;
default:
r = 0;
break;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 6076882..1a55d1a 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -761,6 +761,7 @@ struct kvm_ppc_smmu_info {
#define KVM_CAP_PPC_FIXUP_HCALL 103
#define KVM_CAP_PPC_ENABLE_HCALL 104
#define KVM_CAP_CHECK_EXTENSION_VM 105
+#define KVM_CAP_VMX_APICV 106
#ifdef KVM_CAP_IRQ_ROUTING
--
1.8.3.4
--
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