According to section "CHECKING AND LOADING GUEST STATE" in Intel SDM vol 3C,
the following checks are performed on vmentry of nested guests:
"If the "load IA32_PERF_GLOBAL_CTRL" VM-entry control is 1, bits reserved
in the IA32_PERF_GLOBAL_CTRL MSR must be 0 in the field for that
register."
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx>
Reviewed-by: Karl Heubaum <karl.heubaum@xxxxxxxxxx>
---
arch/x86/kvm/vmx/nested.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index d2067370e288..a7bf19eaa70b 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -2691,6 +2691,10 @@ static int nested_vmx_check_vmentry_postreqs(struct kvm_vcpu *vcpu,
return 1;
}
+ if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL &&
+ !kvm_valid_perf_global_ctrl(vmcs12->guest_ia32_perf_global_ctrl))
+ return 1;
+
/*
* If the load IA32_EFER VM-entry control is 1, the following checks
* are performed on the field for the IA32_EFER MSR:
--
2.17.2
