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[14/15] KVM: nVMX: Don't update GUEST_BNDCFGS if it's clean in HV eVMCS

Message ID 20190507160640.4812-15-sean.j.christopherson@intel.com (mailing list archive)
State New, archived
Headers show
Series KVM: nVMX: Optimize nested VM-Entry | expand

Commit Message

Sean Christopherson May 7, 2019, 4:06 p.m. UTC 
L1 is responsible for dirtying GUEST_GRP1 if it writes GUEST_BNDCFGS.

Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/vmx/nested.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 58717dfe82c9..cfdc04fde8eb 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -2199,6 +2199,10 @@  static void prepare_vmcs02_full(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
 		    (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS))
 			vmcs_write64(GUEST_IA32_DEBUGCTL,
 					vmcs12->guest_ia32_debugctl);
+
+		if (kvm_mpx_supported() && vmx->nested.nested_run_pending &&
+		    (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS))
+			vmcs_write64(GUEST_BNDCFGS, vmcs12->guest_bndcfgs);
 	}
 
 	if (nested_cpu_has_xsaves(vmcs12))
@@ -2234,10 +2238,6 @@  static void prepare_vmcs02_full(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
 	vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, vmx->msr_autoload.guest.nr);
 
 	set_cr4_guest_host_mask(vmx);
-
-	if (kvm_mpx_supported() && vmx->nested.nested_run_pending &&
-	    (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS))
-		vmcs_write64(GUEST_BNDCFGS, vmcs12->guest_bndcfgs);
 }
 
 /*