linux-kernel - Re: [PATCH MANUALSEL 5.15 3/8] KVM: nVMX: Also filter MSR_IA32_VMX_TRUE_PINBASED

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Message-ID: <87b783e6-2bc7-636d-334e-1b09e05724d4@redhat.com>
Date:   Thu, 10 Feb 2022 17:40:11 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, kvm@...r.kernel.org
Subject: Re: [PATCH MANUALSEL 5.15 3/8] KVM: nVMX: Also filter
 MSR_IA32_VMX_TRUE_PINBASED_CTLS when eVMCS

On 2/9/22 19:56, Sasha Levin wrote:
> From: Vitaly Kuznetsov <vkuznets@...hat.com>
> 
> [ Upstream commit f80ae0ef089a09e8c18da43a382c3caac9a424a7 ]

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

Paolo

> Similar to MSR_IA32_VMX_EXIT_CTLS/MSR_IA32_VMX_TRUE_EXIT_CTLS,
> MSR_IA32_VMX_ENTRY_CTLS/MSR_IA32_VMX_TRUE_ENTRY_CTLS pair,
> MSR_IA32_VMX_TRUE_PINBASED_CTLS needs to be filtered the same way
> MSR_IA32_VMX_PINBASED_CTLS is currently filtered as guests may solely rely
> on 'true' MSR data.
> 
> Note, none of the currently existing Windows/Hyper-V versions are known
> to stumble upon the unfiltered MSR_IA32_VMX_TRUE_PINBASED_CTLS, the change
> is aimed at making the filtering future proof.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> Message-Id: <20220112170134.1904308-2-vkuznets@...hat.com>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
>   arch/x86/kvm/vmx/evmcs.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/kvm/vmx/evmcs.c b/arch/x86/kvm/vmx/evmcs.c
> index ba6f99f584ac3..a7ed30d5647af 100644
> --- a/arch/x86/kvm/vmx/evmcs.c
> +++ b/arch/x86/kvm/vmx/evmcs.c
> @@ -362,6 +362,7 @@ void nested_evmcs_filter_control_msr(u32 msr_index, u64 *pdata)
>   	case MSR_IA32_VMX_PROCBASED_CTLS2:
>   		ctl_high &= ~EVMCS1_UNSUPPORTED_2NDEXEC;
>   		break;
> +	case MSR_IA32_VMX_TRUE_PINBASED_CTLS:
>   	case MSR_IA32_VMX_PINBASED_CTLS:
>   		ctl_high &= ~EVMCS1_UNSUPPORTED_PINCTRL;
>   		break;