KVM: x86: rename update_bp_intercept to update_exception_bitmap

We would like to introduce a callback to update the #PF intercept
when CPUID changes.  Just reuse update_bp_intercept since VMX is
already using update_exception_bitmap instead of a bespoke function.

While at it, remove an unnecessary assignment in the SVM version,
which is already done in the caller (kvm_arch_vcpu_ioctl_set_guest_debug)
and has nothing to do with the exception bitmap.
Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/kvm_host.h

@@ -1057,7 +1057,7 @@ struct kvm_x86_ops {
 	void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
 	void (*vcpu_put)(struct kvm_vcpu *vcpu);
 
-	void (*update_bp_intercept)(struct kvm_vcpu *vcpu);
+	void (*update_exception_bitmap)(struct kvm_vcpu *vcpu);
 	int (*get_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr);
 	int (*set_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr);
 	u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);

arch/x86/kvm/svm/svm.c

@@ -1627,7 +1627,7 @@ static void svm_set_segment(struct kvm_vcpu *vcpu,
 	vmcb_mark_dirty(svm->vmcb, VMCB_SEG);
 }
 
-static void update_bp_intercept(struct kvm_vcpu *vcpu)
+static void update_exception_bitmap(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
 
@@ -1636,8 +1636,7 @@ static void update_bp_intercept(struct kvm_vcpu *vcpu)
 	if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
 		if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
 			set_exception_intercept(svm, BP_VECTOR);
-	} else
-		vcpu->guest_debug = 0;
+	}
 }
 
 static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd)
@@ -4037,7 +4036,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
 	.vcpu_blocking = svm_vcpu_blocking,
 	.vcpu_unblocking = svm_vcpu_unblocking,
 
-	.update_bp_intercept = update_bp_intercept,
+	.update_exception_bitmap = update_exception_bitmap,
 	.get_msr_feature = svm_get_msr_feature,
 	.get_msr = svm_get_msr,
 	.set_msr = svm_set_msr,

arch/x86/kvm/vmx/vmx.c

@@ -7875,7 +7875,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
 	.vcpu_load = vmx_vcpu_load,
 	.vcpu_put = vmx_vcpu_put,
 
-	.update_bp_intercept = update_exception_bitmap,
+	.update_exception_bitmap = update_exception_bitmap,
 	.get_msr_feature = vmx_get_msr_feature,
 	.get_msr = vmx_get_msr,
 	.set_msr = vmx_set_msr,

arch/x86/kvm/x86.c

@@ -9316,7 +9316,7 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 	 */
 	kvm_set_rflags(vcpu, rflags);
 
-	kvm_x86_ops.update_bp_intercept(vcpu);
+	kvm_x86_ops.update_exception_bitmap(vcpu);
 
 	r = 0;