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>

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

arch/x86/kvm/vmx/vmx.c

@@ -3844,7 +3844,7 @@ static void vmx_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
 
-	vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, vmx_pin_based_exec_ctrl(vmx));
+	pin_controls_set(vmx, vmx_pin_based_exec_ctrl(vmx));
 	if (cpu_has_secondary_exec_ctrls()) {
 		if (kvm_vcpu_apicv_active(vcpu))
 			vmcs_set_bits(SECONDARY_VM_EXEC_CONTROL,
@@ -4042,7 +4042,7 @@ static void vmx_vcpu_setup(struct vcpu_vmx *vmx)
 	vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */
 
 	/* Control */
-	vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, vmx_pin_based_exec_ctrl(vmx));
+	pin_controls_init(vmx, vmx_pin_based_exec_ctrl(vmx));
 	vmx->hv_deadline_tsc = -1;
 
 	vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, vmx_exec_control(vmx));
@@ -6366,8 +6366,7 @@ static void vmx_arm_hv_timer(struct vcpu_vmx *vmx, u32 val)
 {
 	vmcs_write32(VMX_PREEMPTION_TIMER_VALUE, val);
 	if (!vmx->loaded_vmcs->hv_timer_armed)
-		vmcs_set_bits(PIN_BASED_VM_EXEC_CONTROL,
-			      PIN_BASED_VMX_PREEMPTION_TIMER);
+		pin_controls_setbit(vmx, PIN_BASED_VMX_PREEMPTION_TIMER);
 	vmx->loaded_vmcs->hv_timer_armed = true;
 }
 
@@ -6396,8 +6395,7 @@ static void vmx_update_hv_timer(struct kvm_vcpu *vcpu)
 	}
 
 	if (vmx->loaded_vmcs->hv_timer_armed)
-		vmcs_clear_bits(PIN_BASED_VM_EXEC_CONTROL,
-				PIN_BASED_VMX_PREEMPTION_TIMER);
+		pin_controls_clearbit(vmx, PIN_BASED_VMX_PREEMPTION_TIMER);
 	vmx->loaded_vmcs->hv_timer_armed = false;
 }
 

arch/x86/kvm/vmx/vmx.h

@@ -88,6 +88,7 @@ struct pt_desc {
 struct vmx_controls_shadow {
 	u32 vm_entry;
 	u32 vm_exit;
+	u32 pin;
 };
 
 /*
@@ -423,6 +424,7 @@ static inline void lname##_controls_clearbit(struct vcpu_vmx *vmx, u32 val) \
 }
 BUILD_CONTROLS_SHADOW(vm_entry, VM_ENTRY_CONTROLS)
 BUILD_CONTROLS_SHADOW(vm_exit, VM_EXIT_CONTROLS)
+BUILD_CONTROLS_SHADOW(pin, PIN_BASED_VM_EXEC_CONTROL)
 
 static inline void vmx_segment_cache_clear(struct vcpu_vmx *vmx)
 {