linux-kernel - Re: [PATCH v14 01/22] KVM: x86: Introduce KVM_{G,S}ET_ONE

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Message-ID: <9ccedee3-28aa-4a89-955a-204de8bcbb0f@intel.com>
Date: Wed, 10 Sep 2025 17:03:46 +0800
From: Xiaoyao Li <xiaoyao.li@...el.com>
To: Chao Gao <chao.gao@...el.com>, kvm@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: acme@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
 hpa@...or.com, john.allen@....com, mingo@...nel.org, mingo@...hat.com,
 minipli@...ecurity.net, mlevitsk@...hat.com, namhyung@...nel.org,
 pbonzini@...hat.com, prsampat@....com, rick.p.edgecombe@...el.com,
 seanjc@...gle.com, shuah@...nel.org, tglx@...utronix.de,
 weijiang.yang@...el.com, x86@...nel.org, xin@...or.com
Subject: Re: [PATCH v14 01/22] KVM: x86: Introduce KVM_{G,S}ET_ONE_REG uAPIs
 support

On 9/9/2025 5:39 PM, Chao Gao wrote:
> From: Yang Weijiang <weijiang.yang@...el.com>
> 
> Enable KVM_{G,S}ET_ONE_REG uAPIs so that userspace can access MSRs and
> other non-MSR registers through them.
> 
> This is in preparation for allowing userspace to read/write the guest SSP
> register, which is needed for the upcoming CET virtualization support.
> 
> Currently, two types of registers are supported: KVM_X86_REG_TYPE_MSR and
> KVM_X86_REG_TYPE_KVM. All MSRs are in the former type; the latter type is
> added for registers that lack existing KVM uAPIs to access them. The "KVM"
> in the name is intended to be vague to give KVM flexibility to include
> other potential registers. We considered some specific names, like
> "SYNTHETIC" and "SYNTHETIC_MSR" before, but both are confusing and may put
> KVM itself into a corner.
> 
> Suggested-by: Sean Christopherson <seanjc@...gle.com>
> Signed-off-by: Yang Weijiang <weijiang.yang@...el.com>
> Link: https://lore.kernel.org/all/20240219074733.122080-18-weijiang.yang@intel.com/ [1]
> Tested-by: Mathias Krause <minipli@...ecurity.net>
> Tested-by: John Allen <john.allen@....com>
> Tested-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
> Signed-off-by: Chao Gao <chao.gao@...el.com>

Reviewed-by: Xiaoyao Li <xiaoyao.li@...el.com>