linux-kernel - Re: [PATCH v9 21/22] KVM: nVMX: Guard SHADOW_FIELD

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Message-ID: <aS6InlCSUqeKp9//@intel.com>
Date: Tue, 2 Dec 2025 14:35:10 +0800
From: Chao Gao <chao.gao@...el.com>
To: "Xin Li (Intel)" <xin@...or.com>
CC: <linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <pbonzini@...hat.com>, <seanjc@...gle.com>,
	<corbet@....net>, <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>, <x86@...nel.org>, <hpa@...or.com>,
	<luto@...nel.org>, <peterz@...radead.org>, <andrew.cooper3@...rix.com>,
	<hch@...radead.org>, <sohil.mehta@...el.com>
Subject: Re: [PATCH v9 21/22] KVM: nVMX: Guard SHADOW_FIELD_R[OW] macros with
 VMX feature checks

On Sun, Oct 26, 2025 at 01:19:09PM -0700, Xin Li (Intel) wrote:
>From: Xin Li <xin3.li@...el.com>
>
>Add VMX feature checks to the SHADOW_FIELD_R[OW] macros to prevent access
>to VMCS fields that may be unsupported on some CPUs.
>
>Functions like copy_shadow_to_vmcs12() and copy_vmcs12_to_shadow() access
>VMCS fields that may not exist on certain hardware, such as
>INJECTED_EVENT_DATA.  To avoid VMREAD/VMWRITE warnings, skip syncing fields
>tied to unsupported VMX features.
>
>Signed-off-by: Xin Li <xin3.li@...el.com>
>Signed-off-by: Xin Li (Intel) <xin@...or.com>
>Tested-by: Shan Kang <shan.kang@...el.com>
>Tested-by: Xuelian Guo <xuelian.guo@...el.com>

Reviewed-by: Chao Gao <chao.gao@...el.com>