linux-kernel - Re: [PATCH v2 0/4] KVM: SVM: nSVM: Implement Enlightened MSR-Bitmap for Hyper-V-on-KVM

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Date:   Thu, 03 Feb 2022 10:51:49 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        Vineeth Pillai <viremana@...ux.microsoft.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/4] KVM: SVM: nSVM: Implement Enlightened MSR-Bitmap
 for Hyper-V-on-KVM

Paolo Bonzini <pbonzini@...hat.com> writes:

> On 2/2/22 10:50, Vitaly Kuznetsov wrote:
...
>>    KVM: nSVM: Implement Enlightened MSR-Bitmap feature
...
>
> Queued, thanks.

While writing a selftest for the feature, I've discovered an embarassing
bug: in nested_svm_vmrun_msrpm() I check bit number instead of bit
mask. It worked in testing by pure luck, it seems genuine Hyper-V sets
some other clean fields simultaneously.

Would it be possible to squash the attached patch in? Thanks!

I'll be sending out selftests shortly.

-- 
Vitaly

View attachment "0001-KVM-nSVM-Fix-the-check-for-VMCB_HV_NESTED_ENLIGHTENM.patch" of type "text/x-patch" (1110 bytes)