[PATCH 14/14] KVM: nVMX: Use cached host MSR_IA32_VMX_MISC value for setting up nested MSR

From: Vitaly Kuznetsov
Date: Mon Jun 27 2022 - 12:06:06 EST


vmcs_config has cased host MSR_IA32_VMX_MISC value, use it for setting
up nested MSR_IA32_VMX_MISC in nested_vmx_setup_ctls_msrs() and avoid the
redundant rdmsr().

No (real) functional change intended.

Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
---
arch/x86/kvm/vmx/nested.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index c88a9c6b4606..a35b28261d31 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -6723,10 +6723,7 @@ void nested_vmx_setup_ctls_msrs(struct vmcs_config *vmcs_conf, u32 ept_caps)
msrs->secondary_ctls_high |= SECONDARY_EXEC_ENCLS_EXITING;

/* miscellaneous data */
- rdmsr(MSR_IA32_VMX_MISC,
- msrs->misc_low,
- msrs->misc_high);
- msrs->misc_low &= VMX_MISC_SAVE_EFER_LMA;
+ msrs->misc_low = (u32)vmcs_conf->misc & VMX_MISC_SAVE_EFER_LMA;
msrs->misc_low |=
MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS |
VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE |
--
2.35.3