linux-kernel - Re: [PATCH 1/2] KVM: x86: Add emulation support for #GP triggered by VM instructions

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Message-ID: <X/3eAX4ZyqwCmyFi@google.com>
Date:   Tue, 12 Jan 2021 09:36:01 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Wei Huang <wei.huang2@....com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        pbonzini@...hat.com, vkuznets@...hat.com, joro@...tes.org,
        bp@...en8.de, tglx@...utronix.de, mingo@...hat.com, x86@...nel.org,
        jmattson@...gle.com, wanpengli@...cent.com, bsd@...hat.com,
        dgilbert@...hat.com, mlevitsk@...hat.com
Subject: Re: [PATCH 1/2] KVM: x86: Add emulation support for #GP triggered by
 VM instructions

On Tue, Jan 12, 2021, Wei Huang wrote:
> From: Bandan Das <bsd@...hat.com>
> 
> While running VM related instructions (VMRUN/VMSAVE/VMLOAD), some AMD
> CPUs check EAX against reserved memory regions (e.g. SMM memory on host)
> before checking VMCB's instruction intercept.

It would be very helpful to list exactly which CPUs are/aren't affected, even if
that just means stating something like "all CPUs before XYZ".  Given patch 2/2,
I assume it's all CPUs without the new CPUID flag?