KVM: x86: Remove defunct pre_block/post_block kvm_x86_ops hooks

Drop kvm_x86_ops' pre/post_block() now that all implementations are nops.

No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20211208015236.1616697-10-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/kvm-x86-ops.h

@@ -99,8 +99,6 @@ KVM_X86_OP(handle_exit_irqoff)
 KVM_X86_OP_NULL(request_immediate_exit)
 KVM_X86_OP(sched_in)
 KVM_X86_OP_NULL(update_cpu_dirty_logging)
-KVM_X86_OP_NULL(pre_block)
-KVM_X86_OP_NULL(post_block)
 KVM_X86_OP_NULL(vcpu_blocking)
 KVM_X86_OP_NULL(vcpu_unblocking)
 KVM_X86_OP_NULL(update_pi_irte)

arch/x86/include/asm/kvm_host.h

@@ -1454,18 +1454,6 @@ struct kvm_x86_ops {
 	const struct kvm_pmu_ops *pmu_ops;
 	const struct kvm_x86_nested_ops *nested_ops;
 
-	/*
-	 * Architecture specific hooks for vCPU blocking due to
-	 * HLT instruction.
-	 * Returns for .pre_block():
-	 *    - 0 means continue to block the vCPU.
-	 *    - 1 means we cannot block the vCPU since some event
-	 *        happens during this period, such as, 'ON' bit in
-	 *        posted-interrupts descriptor is set.
-	 */
-	int (*pre_block)(struct kvm_vcpu *vcpu);
-	void (*post_block)(struct kvm_vcpu *vcpu);
-
 	void (*vcpu_blocking)(struct kvm_vcpu *vcpu);
 	void (*vcpu_unblocking)(struct kvm_vcpu *vcpu);
 

arch/x86/kvm/vmx/vmx.c

@@ -7566,16 +7566,6 @@ void vmx_update_cpu_dirty_logging(struct kvm_vcpu *vcpu)
 		secondary_exec_controls_clearbit(vmx, SECONDARY_EXEC_ENABLE_PML);
 }
 
-static int vmx_pre_block(struct kvm_vcpu *vcpu)
-{
-	return 0;
-}
-
-static void vmx_post_block(struct kvm_vcpu *vcpu)
-{
-
-}
-
 static void vmx_setup_mce(struct kvm_vcpu *vcpu)
 {
 	if (vcpu->arch.mcg_cap & MCG_LMCE_P)
@@ -7777,9 +7767,6 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
 	.cpu_dirty_log_size = PML_ENTITY_NUM,
 	.update_cpu_dirty_logging = vmx_update_cpu_dirty_logging,
 
-	.pre_block = vmx_pre_block,
-	.post_block = vmx_post_block,
-
 	.pmu_ops = &intel_pmu_ops,
 	.nested_ops = &vmx_nested_ops,
 

arch/x86/kvm/x86.c

@@ -10148,8 +10148,7 @@ static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu)
 {
 	bool hv_timer;
 
-	if (!kvm_arch_vcpu_runnable(vcpu) &&
-	    (!kvm_x86_ops.pre_block || static_call(kvm_x86_pre_block)(vcpu) == 0)) {
+	if (!kvm_arch_vcpu_runnable(vcpu)) {
 		/*
 		 * Switch to the software timer before halt-polling/blocking as
 		 * the guest's timer may be a break event for the vCPU, and the
@@ -10171,9 +10170,6 @@ static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu)
 		if (hv_timer)
 			kvm_lapic_switch_to_hv_timer(vcpu);
 
-		if (kvm_x86_ops.post_block)
-			static_call(kvm_x86_post_block)(vcpu);
-
 		if (!kvm_check_request(KVM_REQ_UNHALT, vcpu))
 			return 1;
 	}