linux-kernel - Re: [PATCH v14 09/13] KVM: x86: Report CET MSRs as to-be-saved if CET is supported

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Date:   Thu, 28 Jan 2021 18:46:37 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Yang Weijiang <weijiang.yang@...el.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, sean.j.christopherson@...el.com,
        jmattson@...gle.com
Cc:     yu.c.zhang@...ux.intel.com
Subject: Re: [PATCH v14 09/13] KVM: x86: Report CET MSRs as to-be-saved if CET
 is supported

On 06/11/20 02:16, Yang Weijiang wrote:
> Report all CET MSRs, including the synthetic GUEST_SSP MSR, as
> to-be-saved, e.g. for migration, if CET is supported by KVM.
> 
> Co-developed-by: Sean Christopherson <sean.j.christopherson@...el.com>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> Signed-off-by: Yang Weijiang <weijiang.yang@...el.com>
> ---
>   arch/x86/kvm/x86.c | 9 +++++++++
>   1 file changed, 9 insertions(+)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 751b62e871e5..d573cadf5baf 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -1248,6 +1248,8 @@ static const u32 msrs_to_save_all[] = {
>   	MSR_ARCH_PERFMON_EVENTSEL0 + 16, MSR_ARCH_PERFMON_EVENTSEL0 + 17,
>   
>   	MSR_IA32_XSS,
> +	MSR_IA32_U_CET, MSR_IA32_S_CET, MSR_IA32_INT_SSP_TAB, MSR_KVM_GUEST_SSP,
> +	MSR_IA32_PL0_SSP, MSR_IA32_PL1_SSP, MSR_IA32_PL2_SSP, MSR_IA32_PL3_SSP,
>   };
>   
>   static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)];
> @@ -5761,6 +5763,13 @@ static void kvm_init_msr_list(void)
>   			if (!supported_xss)
>   				continue;
>   			break;
> +		case MSR_IA32_U_CET:
> +		case MSR_IA32_S_CET:
> +		case MSR_IA32_INT_SSP_TAB:
> +		case MSR_IA32_PL0_SSP ... MSR_IA32_PL3_SSP:
> +			if (!kvm_cet_supported())
> +				continue;
> +			break;
>   		default:
>   			break;
>   		}
> 

Missing "case MSR_KVM_GUEST_SSP".

Paolo