Re: [PATCH v4 14/19] KVM: SVM: Check that the current CPU supports SVM in kvm_is_svm_supported()

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Subject: Re: [PATCH v4 14/19] KVM: SVM: Check that the current CPU supports SVM in kvm_is_svm_supported()
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Mon, 24 Jul 2023 23:21:50 +0200
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, Paolo Bonzini <pbonzini@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>, Kai Huang <kai.huang@xxxxxxxxx>, Chao Gao <chao.gao@xxxxxxxxx>
In-reply-to: <20230721201859.2307736-15-seanjc@google.com>
References: <20230721201859.2307736-1-seanjc@google.com> <20230721201859.2307736-15-seanjc@google.com>

On Fri, Jul 21, 2023 at 01:18:54PM -0700, Sean Christopherson wrote:
> Check "this" CPU instead of the boot CPU when querying SVM support so that
> the per-CPU checks done during hardware enabling actually function as
> intended, i.e. will detect issues where SVM isn't support on all CPUs.

Is that a realistic concern?

Follow-Ups:
- Re: [PATCH v4 14/19] KVM: SVM: Check that the current CPU supports SVM in kvm_is_svm_supported()
  - From: Sean Christopherson

References:
- [PATCH v4 00/19] x86/reboot: KVM: Clean up "emergency" virt code
  - From: Sean Christopherson
- [PATCH v4 14/19] KVM: SVM: Check that the current CPU supports SVM in kvm_is_svm_supported()
  - From: Sean Christopherson

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