diff mbox series

[v3,22/34] KVM: x86: Expose Hyper-V L2 TLB flush feature

Message ID 20220414132013.1588929-23-vkuznets@redhat.com (mailing list archive)
State New, archived
Headers show
Series KVM: x86: hyper-v: Fine-grained TLB flush + L2 TLB flush feature | expand

Commit Message

Vitaly Kuznetsov April 14, 2022, 1:20 p.m. UTC 
With both nSVM and nVMX implementations in place, KVM can now expose
Hyper-V L2 TLB flush feature to userspace.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 arch/x86/kvm/hyperv.c | 1 +
 1 file changed, 1 insertion(+)

Comments

Maxim Levitsky May 11, 2022, 11:34 a.m. UTC | #1 
On Thu, 2022-04-14 at 15:20 +0200, Vitaly Kuznetsov wrote:
> With both nSVM and nVMX implementations in place, KVM can now expose
> Hyper-V L2 TLB flush feature to userspace.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> ---
>  arch/x86/kvm/hyperv.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
> index 68a0df4e3f66..1d6927538bc7 100644
> --- a/arch/x86/kvm/hyperv.c
> +++ b/arch/x86/kvm/hyperv.c
> @@ -2826,6 +2826,7 @@ int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
>  
>  		case HYPERV_CPUID_NESTED_FEATURES:
>  			ent->eax = evmcs_ver;
> +			ent->eax |= HV_X64_NESTED_DIRECT_FLUSH;
>  			ent->eax |= HV_X64_NESTED_MSR_BITMAP;
>  
>  			break;

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>

Best regards,
	Maxim Levitsky
diff mbox series

Patch

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 68a0df4e3f66..1d6927538bc7 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -2826,6 +2826,7 @@  int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
 
 		case HYPERV_CPUID_NESTED_FEATURES:
 			ent->eax = evmcs_ver;
+			ent->eax |= HV_X64_NESTED_DIRECT_FLUSH;
 			ent->eax |= HV_X64_NESTED_MSR_BITMAP;
 
 			break;