[PATCH v3 1/5] KVM: nVMX: Also filter MSR_IA32_VMX_TRUE_PINBASED_CTLS when eVMCS

From: Vitaly Kuznetsov
Date: Wed Jan 12 2022 - 12:01:53 EST


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@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 ba6f99f584ac..a7ed30d5647a 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;
--
2.34.1