linux-kernel - Re: [PATCH v12 23/24] KVM: nVMX: Add consistency checks for CR0.WP and CR4.CET

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Message-ID: <aKS0EADlViB2Mg4e@google.com>
Date: Tue, 19 Aug 2025 10:27:44 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Chao Gao <chao.gao@...el.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, mlevitsk@...hat.com, 
	rick.p.edgecombe@...el.com, weijiang.yang@...el.com, xin@...or.com, 
	Mathias Krause <minipli@...ecurity.net>, John Allen <john.allen@....com>, 
	Paolo Bonzini <pbonzini@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v12 23/24] KVM: nVMX: Add consistency checks for CR0.WP
 and CR4.CET

On Mon, Aug 11, 2025, Chao Gao wrote:
> Add consistency checks for CR4.CET and CR0.WP in guest-state or host-state
> area in the VMCS12. This ensures that configurations with CR4.CET set and
> CR0.WP not set result in VM-entry failure, aligning with architectural
> behavior.

The consistency check patches need to land before KVM lets L1 enable CET for L2.