[40/43] KVM: nVMX: Preset *DT exiting in vmcs02 when emulating UMIP
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Message ID 1560445409-17363-41-git-send-email-pbonzini@redhat.com
State New
Headers show
  • VMX optimizations
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Commit Message

Paolo Bonzini June 13, 2019, 5:03 p.m. UTC
From: Sean Christopherson <sean.j.christopherson@intel.com>

KVM dynamically toggles SECONDARY_EXEC_DESC to intercept (a subset of)
instructions that are subject to User-Mode Instruction Prevention, i.e.
VMCS.SECONDARY_EXEC_DESC == CR4.UMIP when emulating UMIP.  Preset the
VMCS control when preparing vmcs02 to avoid unnecessarily VMWRITEs,
e.g. KVM will clear VMCS.SECONDARY_EXEC_DESC in prepare_vmcs02_early()
and then set it in vmx_set_cr4().

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
 arch/x86/kvm/vmx/nested.c | 8 ++++++++
 1 file changed, 8 insertions(+)

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diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 14a8cfade50f..598540ce0f52 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -2085,6 +2085,14 @@  static void prepare_vmcs02_early(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
 		/* VMCS shadowing for L2 is emulated for now */
 		exec_control &= ~SECONDARY_EXEC_SHADOW_VMCS;
+		/*
+		 * Preset *DT exiting when emulating UMIP, so that vmx_set_cr4()
+		 * will not have to rewrite the controls just for this bit.
+		 */
+		if (!boot_cpu_has(X86_FEATURE_UMIP) && vmx_umip_emulated() &&
+		    (vmcs12->guest_cr4 & X86_CR4_UMIP))
+			exec_control |= SECONDARY_EXEC_DESC;