linux-kernel - Re: [PATCH MANUALSEL 5.4 3/4] kvm: x86: Add AMD PMU MSRs to msrs_to_save

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Message-ID: <da3899d8-7f9a-7425-e370-f8b00eb63123@redhat.com>
Date:   Wed, 6 Oct 2021 13:23:39 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Cc:     Fares Mehanna <faresx@...zon.de>, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org, kvm@...r.kernel.org
Subject: Re: [PATCH MANUALSEL 5.4 3/4] kvm: x86: Add AMD PMU MSRs to
 msrs_to_save_all[]

On 06/10/21 13:12, Sasha Levin wrote:
> From: Fares Mehanna <faresx@...zon.de>
> 
> [ Upstream commit e1fc1553cd78292ab3521c94c9dd6e3e70e606a1 ]
> 
> Intel PMU MSRs is in msrs_to_save_all[], so add AMD PMU MSRs to have a
> consistent behavior between Intel and AMD when using KVM_GET_MSRS,
> KVM_SET_MSRS or KVM_GET_MSR_INDEX_LIST.
> 
> We have to add legacy and new MSRs to handle guests running without
> X86_FEATURE_PERFCTR_CORE.
> 
> Signed-off-by: Fares Mehanna <faresx@...zon.de>
> Message-Id: <20210915133951.22389-1-faresx@...zon.de>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
>   arch/x86/kvm/x86.c | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 69e286edb2c9..4948bf36bd0a 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -1239,6 +1239,13 @@ static const u32 msrs_to_save_all[] = {
>   	MSR_ARCH_PERFMON_EVENTSEL0 + 12, MSR_ARCH_PERFMON_EVENTSEL0 + 13,
>   	MSR_ARCH_PERFMON_EVENTSEL0 + 14, MSR_ARCH_PERFMON_EVENTSEL0 + 15,
>   	MSR_ARCH_PERFMON_EVENTSEL0 + 16, MSR_ARCH_PERFMON_EVENTSEL0 + 17,
> +
> +	MSR_K7_EVNTSEL0, MSR_K7_EVNTSEL1, MSR_K7_EVNTSEL2, MSR_K7_EVNTSEL3,
> +	MSR_K7_PERFCTR0, MSR_K7_PERFCTR1, MSR_K7_PERFCTR2, MSR_K7_PERFCTR3,
> +	MSR_F15H_PERF_CTL0, MSR_F15H_PERF_CTL1, MSR_F15H_PERF_CTL2,
> +	MSR_F15H_PERF_CTL3, MSR_F15H_PERF_CTL4, MSR_F15H_PERF_CTL5,
> +	MSR_F15H_PERF_CTR0, MSR_F15H_PERF_CTR1, MSR_F15H_PERF_CTR2,
> +	MSR_F15H_PERF_CTR3, MSR_F15H_PERF_CTR4, MSR_F15H_PERF_CTR5,
>   };
>   
>   static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)];
> 

Acked-by: Paolo Bonzini <pbonzini@...hat.com>