linux-kernel - Re: [PATCH 0/3] KVM: nSVM: Fixes for SVM_EXIT_CR0_SEL

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Message-ID: <yx5o5o4xqwqlqcpnfrak72c3mg7mbup7ejdzwufzqgtdf3opze@zaq6ebnq2ho2>
Date: Fri, 24 Oct 2025 19:51:25 +0000
From: Yosry Ahmed <yosry.ahmed@...ux.dev>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>, Jim Mattson <jmattson@...gle.com>, 
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] KVM: nSVM: Fixes for SVM_EXIT_CR0_SEL_WRITE injection

On Fri, Oct 24, 2025 at 07:29:15PM +0000, Yosry Ahmed wrote:
> A couple of fixes for injecting SVM_EXIT_CR0_SEL_WRITE to L1 when
> emulating MOV-to-CR0 or LMSW. LMSW is handled by the emulator even in
> some cases where decode assists are enabled, so it's a more important
> fix. An example would be if L0 intercepts SVM_EXIT_WRITE_CR0 while L1
> intercepts SVM_EXIT_CR0_SEL_WRITE.
> 
> Patch is an unrelated cleanup that can be dropped/merged separately.

Patch 1*

Also, related tests:
https://lore.kernel.org/kvm/20251024194925.3201933-1-yosry.ahmed@linux.dev/

> 
> Yosry Ahmed (3):
>   KVM: nSVM: Remove redundant cases in nested_svm_intercept()
>   KVM: nSVM: Propagate SVM_EXIT_CR0_SEL_WRITE correctly for LMSW
>     emulation
>   KVM: nSVM: Avoid incorrect injection of SVM_EXIT_CR0_SEL_WRITE
> 
>  arch/x86/kvm/svm/nested.c | 10 ----------
>  arch/x86/kvm/svm/svm.c    | 34 ++++++++++++++++++++++------------
>  2 files changed, 22 insertions(+), 22 deletions(-)
> 
> -- 
> 2.51.1.821.gb6fe4d2222-goog
>