linux-kernel - Re: [PATCH v2 06/25] KVM: VMX: Defer enabling FRED MSRs save/load until after set CPUID

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Date: Fri, 19 Apr 2024 19:02:32 +0800
From: Chao Gao <chao.gao@...el.com>
To: Xin Li <xin3.li@...el.com>
CC: <linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
	<seanjc@...gle.com>, <pbonzini@...hat.com>, <corbet@....net>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>, <x86@...nel.org>, <hpa@...or.com>,
	<shuah@...nel.org>, <vkuznets@...hat.com>, <peterz@...radead.org>,
	<ravi.v.shankar@...el.com>, <xin@...or.com>
Subject: Re: [PATCH v2 06/25] KVM: VMX: Defer enabling FRED MSRs save/load
 until after set CPUID

On Wed, Feb 07, 2024 at 09:26:26AM -0800, Xin Li wrote:
>Clear FRED VM entry/exit controls when initializing a vCPU, and set
>these controls only if FRED is enumerated after set CPUID.
>
>FRED VM entry/exit controls need to be set to establish context
>sufficient to support FRED event delivery immediately after VM entry
>and exit. However it is not required to save/load FRED MSRs for
>a non-FRED guest, which aren't supposed to access FRED MSRs.
>
>Signed-off-by: Xin Li <xin3.li@...el.com>
>Tested-by: Shan Kang <shan.kang@...el.com>

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