Re: [PATCH v2 6/9] KVM: SVM: Add MSR_IA32_XSS to the GHCB for hypervisor kernel

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Subject: Re: [PATCH v2 6/9] KVM: SVM: Add MSR_IA32_XSS to the GHCB for hypervisor kernel
From: Sean Christopherson <seanjc@xxxxxxxxxx>
Date: Thu, 2 May 2024 11:34:50 -0700
Cc: John Allen <john.allen@xxxxxxx>, kvm@xxxxxxxxxxxxxxx, weijiang.yang@xxxxxxxxx, rick.p.edgecombe@xxxxxxxxx, bp@xxxxxxxxx, pbonzini@xxxxxxxxxx, mlevitsk@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx
In-reply-to: <9b05e2d7-ac1c-e60f-0f6e-f4befea06334@amd.com>
References: <20240226213244.18441-1-john.allen@amd.com> <20240226213244.18441-7-john.allen@amd.com> <ZjLTr0n0nwBrZW36@google.com> <9b05e2d7-ac1c-e60f-0f6e-f4befea06334@amd.com>

On Thu, May 02, 2024, Tom Lendacky wrote:
> The hypervisor side could be optimized to compare the value and only update
> the CPUID runtime if those values are different.

Heh, this is exactly the thought I had around dinner time yesterday :-)

References:
- [PATCH v2 0/9] SVM guest shadow stack support
  - From: John Allen
- [PATCH v2 6/9] KVM: SVM: Add MSR_IA32_XSS to the GHCB for hypervisor kernel
  - From: John Allen
- Re: [PATCH v2 6/9] KVM: SVM: Add MSR_IA32_XSS to the GHCB for hypervisor kernel
  - From: Sean Christopherson
- Re: [PATCH v2 6/9] KVM: SVM: Add MSR_IA32_XSS to the GHCB for hypervisor kernel
  - From: Tom Lendacky

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