linux-kernel - Re: [RFC PATCH 05/18] KVM: x86: Add pt_guest_exec_control to kvm_vcpu

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Message-ID: <aCI6qMg6OjT-cWzR@google.com>
Date: Mon, 12 May 2025 11:15:04 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Jon Kohler <jon@...anix.com>
Cc: pbonzini@...hat.com, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, 
	dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com, 
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 05/18] KVM: x86: Add pt_guest_exec_control to kvm_vcpu_arch

On Thu, Mar 13, 2025, Jon Kohler wrote:
> Add bool for pt_guest_exec_control to kvm_vcpu_arch, to be used for
> runtime checks for Intel Mode Based Execution Control (MBEC) and
> AMD Guest Mode Execute Control (GMET).
> 
> Signed-off-by: Jon Kohler <jon@...anix.com>
> 
> ---
>  arch/x86/include/asm/kvm_host.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index fd37dad38670..192233eb557a 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -856,6 +856,8 @@ struct kvm_vcpu_arch {
>  	struct kvm_hypervisor_cpuid kvm_cpuid;
>  	bool is_amd_compatible;
>  
> +	bool pt_guest_exec_control;

Again, aside from the fast that putting this in kvm_vcpu_arch is wrong, this not
worth of a separate patch.