KVM: VMX: Shadow VMCS pin controls

Prepare to shadow all major control fields on a per-VMCS basis, which
allows KVM to avoid costly VMWRITEs when switching between vmcs01 and
vmcs02.

Shadowing pin controls also allows a future patch to remove the per-VMCS
'hv_timer_armed' flag, as the shadow copy is a superset of said flag.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index cd33f3109f24..8617d305fbbd 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -285,6 +285,7 @@ static void vmx_switch_vmcs(struct kvm_vcpu *vcpu, struct loaded_vmcs *vmcs)
 
         vm_entry_controls_reset_shadow(vmx);
         vm_exit_controls_reset_shadow(vmx);
+        pin_controls_reset_shadow(vmx);
         vmx_segment_cache_clear(vmx);
 }
 
@@ -2026,7 +2027,7 @@ static void prepare_vmcs02_early(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
         } else {
                 exec_control &= ~PIN_BASED_POSTED_INTR;
         }
-        vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, exec_control);
+        pin_controls_init(vmx, exec_control);
 
         /*
          * EXEC CONTROLS