linux-kernel - Re: [PATCH v5 08/19] KVM:x86: Report KVM supported CET MSRs as to-be-saved

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Date:   Wed, 9 Aug 2023 11:14:20 +0800
From:   "Yang, Weijiang" <weijiang.yang@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
CC:     <rick.p.edgecombe@...el.com>, <chao.gao@...el.com>,
        <binbin.wu@...ux.intel.com>, <seanjc@...gle.com>,
        <peterz@...radead.org>, <john.allen@....com>,
        <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 08/19] KVM:x86: Report KVM supported CET MSRs as
 to-be-saved

On 8/5/2023 5:47 AM, Paolo Bonzini wrote:
> On 8/3/23 06:27, Yang Weijiang wrote:
>> Add all CET MSRs including the synthesized GUEST_SSP to report list.
>> PL{0,1,2}_SSP are independent to host XSAVE management with later
>> patches. MSR_IA32_U_CET and MSR_IA32_PL3_SSP are XSAVE-managed on
>> host side. MSR_IA32_S_CET/MSR_IA32_INT_SSP_TAB/MSR_KVM_GUEST_SSP
>> are not XSAVE-managed.
>
> MSR_KVM_GUEST_SSP -> MSR_KVM_SSP
>
> Also please add a comment,
>
> /*
>  * SSP can only be read via RDSSP; writing even requires
>  * destructive and potentially faulting operations such as
>  * SAVEPREVSSP/RSTORSSP or SETSSBSY/CLRSSBSY.  Let the host
>  * use a pseudo-MSR that is just a wrapper for the GUEST_SSP
>  * field of the VMCS.
>  */
>
OK,  will take it, thanks!
> Paolo
>