linux-kernel - Re: [PATCH v3 22/34] KVM: x86: Expose Hyper-V L2 TLB flush feature

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Message-ID: <5f10e72e7be843c629c5de4be93fad6ac091c285.camel@redhat.com>
Date:   Wed, 11 May 2022 14:34:02 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Siddharth Chandrasekaran <sidcha@...zon.de>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 22/34] KVM: x86: Expose Hyper-V L2 TLB flush feature

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@...hat.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@...hat.com>

Best regards,
	Maxim Levitsky