linux-kernel - Re: [RFC 29/33] KVM: VMX: Save instruction length on EPT violation

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Message-ID: <CALMp9eTmAR_yMMxujiMDQ6_VpUF3ghoKAdy_SYvu-QOAThntZA@mail.gmail.com>
Date:   Wed, 8 Nov 2023 10:19:39 -0800
From:   Jim Mattson <jmattson@...gle.com>
To:     Alexander Graf <graf@...zon.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Nicolas Saenz Julienne <nsaenz@...zon.com>,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org, pbonzini@...hat.com,
        vkuznets@...hat.com, anelkz@...zon.com, dwmw@...zon.co.uk,
        jgowans@...zon.com, corbert@....net, kys@...rosoft.com,
        haiyangz@...rosoft.com, decui@...rosoft.com, x86@...nel.org,
        linux-doc@...r.kernel.org
Subject: Re: [RFC 29/33] KVM: VMX: Save instruction length on EPT violation

On Wed, Nov 8, 2023 at 9:27 AM Alexander Graf <graf@...zon.com> wrote:

> My point with the comment on this patch was "Don't break AMD (or ancient
> VMX without instruction length decoding [Does that exist? I know SVM has
> old CPUs that don't do it]) please".

VM-exit instruction length is not defined for all VM-exit reasons (EPT
misconfiguration is one that is notably absent), but the field has
been there since Prescott.