linux-kernel - Re: [PATCH v2 2/2] KVM: x86: announce KVM_CAP_HYPERV_ENLIGHTENED

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Message-ID: <CALMp9eTB_yoYGoNQ5DP+XtVbM8fD21aSD+D6onaE7gCxJueqvw@mail.gmail.com>
Date:   Wed, 28 Aug 2019 09:24:23 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Roman Kagan <rkagan@...tuozzo.com>
Subject: Re: [PATCH v2 2/2] KVM: x86: announce KVM_CAP_HYPERV_ENLIGHTENED_VMCS
 support only when it is available

On Wed, Aug 28, 2019 at 12:59 AM Vitaly Kuznetsov <vkuznets@...hat.com> wrote:
>
> It was discovered that after commit 65efa61dc0d5 ("selftests: kvm: provide
> common function to enable eVMCS") hyperv_cpuid selftest is failing on AMD.
> The reason is that the commit changed _vcpu_ioctl() to vcpu_ioctl() in the
> test and this one can't fail.
>
> Instead of fixing the test is seems to make more sense to not announce
> KVM_CAP_HYPERV_ENLIGHTENED_VMCS support if it is definitely missing
> (on svm and in case kvm_intel.nested=0).
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Reviewed-by: Jim Mattson <jmattson@...gle.com>