linux-kernel - Re: [PATCH v9 19/22] KVM: nVMX: Handle FRED VMCS fields in nested VMX context

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Message-Id: <92CC125E-E778-447F-A2A8-25EE74F0B299@zytor.com>
Date: Tue, 20 Jan 2026 10:10:38 -0800
From: Xin Li <xin@...or.com>
To: Dave Hansen <dave.hansen@...el.com>
Cc: Chao Gao <chao.gao@...el.com>, 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 19/22] KVM: nVMX: Handle FRED VMCS fields in nested VMX
 context


> On Jan 20, 2026, at 8:07 AM, Dave Hansen <dave.hansen@...el.com> wrote:
> 
> On 1/19/26 22:30, Xin Li wrote:
>>> On Dec 1, 2025, at 10:32 PM, Chao Gao <chao.gao@...el.com> wrote:
>>>> + nested_vmx_set_intercept_for_msr(vmx, msr_bitmap_l1, msr_bitmap_l0,
>>>> +  MSR_IA32_FRED_RSP0, MSR_TYPE_RW);
>>> Why is only this specific MSR handled? What about other FRED MSRs?
>> Peter just gave a good explanation:
>> 
>> https://lore.kernel.org/lkml/f0768546-a767-4d74-956e-b40128272a09@zytor.com/
> 
> Yup! It would be great to get some of that content into the changelogs
> and comments.

Sure, I will do it with Peter :)

And we already have a document file: Documentation/arch/x86/x86_64/fred.rst.

I think the comment is more for native, right?