linux-kernel - Re: [PATCH 33/43] KVM: VMX: Refresh list of user return MSRs after setting guest CPUID

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Message-ID: <CAAeT=FwtKXc6_gjf8YAx9yLn+aTXZ3rdzxXW-+dxPWR_mm=uDA@mail.gmail.com>
Date:   Tue, 18 May 2021 22:35:55 -0700
From:   Reiji Watanabe <reijiw@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 33/43] KVM: VMX: Refresh list of user return MSRs after
 setting guest CPUID

On Fri, Apr 23, 2021 at 5:55 PM Sean Christopherson <seanjc@...gle.com> wrote:
>
> After a CPUID update, refresh the list of user return MSRs that are
> loaded into hardware when running the vCPU.  This is necessary to handle
> the oddball case where userspace exposes X86_FEATURE_RDTSCP to the guest
> after the vCPU is running.
>
> Fixes: 0023ef39dc35 ("kvm: vmx: Set IA32_TSC_AUX for legacy mode guests")
> Fixes: 4e47c7a6d714 ("KVM: VMX: Add instruction rdtscp support for guest")
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>

Reviewed-by: Reiji Watanabe <reijiw@...gle.com>