We shouldn't probably be suggesting using Enlightened VMCS when it's not
enabled (not supported from guest's point of view). System reset through
synthetic MSR is not recommended neither by genuine Hyper-V nor my QEMU.
Windows seems to be fine either way but let's be consistent.
Fixes: 2bc39970e932 ("x86/kvm/hyper-v: Introduce KVM_GET_SUPPORTED_HV_CPUID")
Signed-off-by: Vitaly Kuznetsov <[email protected]>
---
arch/x86/kvm/hyperv.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index ac44a681f065..4730fcaa70cf 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1847,11 +1847,11 @@ int kvm_vcpu_ioctl_get_hv_cpuid(struct kvm_vcpu *vcpu,
struct kvm_cpuid2 *cpuid,
case HYPERV_CPUID_ENLIGHTMENT_INFO:
ent->eax |= HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED;
ent->eax |= HV_X64_APIC_ACCESS_RECOMMENDED;
- ent->eax |= HV_X64_SYSTEM_RESET_RECOMMENDED;
ent->eax |= HV_X64_RELAXED_TIMING_RECOMMENDED;
ent->eax |= HV_X64_CLUSTER_IPI_RECOMMENDED;
ent->eax |= HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED;
- ent->eax |= HV_X64_ENLIGHTENED_VMCS_RECOMMENDED;
+ if (evmcs_ver)
+ ent->eax |= HV_X64_ENLIGHTENED_VMCS_RECOMMENDED;
/*
* Default number of spinlock retry attempts, matches
--
2.20.1
