linux-kernel - Re: [PATCH v1 2/4] KVM/vmx: auto switch MSR_IA32

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Message-ID: <255ea5c8-09be-9597-93b5-f0524eaa2b4b@redhat.com>
Date:   Mon, 25 Sep 2017 13:57:17 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wei Wang <wei.w.wang@...el.com>,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, mst@...hat.com, rkrcmar@...hat.com,
        ak@...ux.intel.com, mingo@...hat.com
Subject: Re: [PATCH v1 2/4] KVM/vmx: auto switch MSR_IA32_DEBUGCTLMSR

On 25/09/2017 06:44, Wei Wang wrote:
> Passthrough the MSR_IA32_DEBUGCTLMSR to the guest, and take advantage of
> the hardware VT-x feature to auto switch the msr upon VMExit and VMEntry.

I think most bits in the MSR should not be passed through (for example
FREEZE_WHILE_SMM_EN, FREEZE_LBRS_ON_PMI etc.).  Using auto-switch of
course is fine instead.

Paolo