linux-kernel - Re: [PATCH MANUALSEL 5.16 3/8] KVM: nVMX: Also filter MSR_IA32_VMX_TRUE_PINBASED

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Date:   Thu, 10 Feb 2022 17:42:21 +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 5.16 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 ]
> 
> 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.

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

Paolo

> 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 09fac0ddac8bd..87e3dc10edf40 100644
> --- a/arch/x86/kvm/vmx/evmcs.c
> +++ b/arch/x86/kvm/vmx/evmcs.c
> @@ -361,6 +361,7 @@ 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;