linux-kernel - Re: [PATCH v2 22/25] KVM: x86: Allow FRED/LKGS/WRMSRNS to be exposed to guests

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Message-ID: <Zms7EnytQfy_y4mw@google.com>
Date: Thu, 13 Jun 2024 11:31:46 -0700
From: Sean Christopherson <seanjc@...gle.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, 
	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 22/25] KVM: x86: Allow FRED/LKGS/WRMSRNS to be exposed
 to guests

On Wed, Feb 07, 2024, Xin Li wrote:
> Allow FRED/LKGS/WRMSRNS to be exposed to guests, thus a guest OS could see
> these features when the guest is configured with FRED/LKGS/WRMSRNS in Qemu.

(a) please describe what these features are, and (b) one patch per feature unless
they _must_ be bundled together, in which case there needs to be code to enforce
that.

> A qemu patch is required to expose FRED/LKGS/WRMSRNS to KVM guests.

Omit this, QEMU is not the only VMM that uses KVM.