Re: [PATCH MANUALSEL 5.16 3/8] KVM: nVMX: Also filter MSR_IA32_VMX_TRUE_PINBASED_CTLS when eVMCS

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On 2/9/22 19:56, Sasha Levin wrote:
From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>

[ 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@xxxxxxxxxx>

Paolo

Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Message-Id: <20220112170134.1904308-2-vkuznets@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
  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;




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