KVM: x86: introduce complete_emulated_msr callback

This will be used by SEV-ES to inject MSR failure via the GHCB.
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/kvm_host.h

@@ -1285,6 +1285,7 @@ struct kvm_x86_ops {
 
 	void (*migrate_timers)(struct kvm_vcpu *vcpu);
 	void (*msr_filter_changed)(struct kvm_vcpu *vcpu);
+	int (*complete_emulated_msr)(struct kvm_vcpu *vcpu, int err);
 };
 
 struct kvm_x86_nested_ops {

arch/x86/kvm/svm/svm.c

@@ -4306,6 +4306,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
 	.apic_init_signal_blocked = svm_apic_init_signal_blocked,
 
 	.msr_filter_changed = svm_msr_filter_changed,
+	.complete_emulated_msr = kvm_complete_insn_gp,
 };
 
 static struct kvm_x86_init_ops svm_init_ops __initdata = {

arch/x86/kvm/vmx/vmx.c

@@ -7701,6 +7701,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
 	.migrate_timers = vmx_migrate_timers,
 
 	.msr_filter_changed = vmx_msr_filter_changed,
+	.complete_emulated_msr = kvm_complete_insn_gp,
 	.cpu_dirty_log_size = vmx_cpu_dirty_log_size,
 };
 

arch/x86/kvm/x86.c

@@ -1642,12 +1642,12 @@ static int complete_emulated_rdmsr(struct kvm_vcpu *vcpu)
 		kvm_rdx_write(vcpu, vcpu->run->msr.data >> 32);
 	}
 
-	return kvm_complete_insn_gp(vcpu, err);
+	return kvm_x86_ops.complete_emulated_msr(vcpu, err);
 }
 
 static int complete_emulated_wrmsr(struct kvm_vcpu *vcpu)
 {
-	return kvm_complete_insn_gp(vcpu, vcpu->run->msr.error);
+	return kvm_x86_ops.complete_emulated_msr(vcpu, vcpu->run->msr.error);
 }
 
 static u64 kvm_msr_reason(int r)
@@ -1719,7 +1719,7 @@ int kvm_emulate_rdmsr(struct kvm_vcpu *vcpu)
 		trace_kvm_msr_read_ex(ecx);
 	}
 
-	return kvm_complete_insn_gp(vcpu, r);
+	return kvm_x86_ops.complete_emulated_msr(vcpu, r);
 }
 EXPORT_SYMBOL_GPL(kvm_emulate_rdmsr);
 
@@ -1745,7 +1745,7 @@ int kvm_emulate_wrmsr(struct kvm_vcpu *vcpu)
 	else
 		trace_kvm_msr_write_ex(ecx, data);
 
-	return kvm_complete_insn_gp(vcpu, r);
+	return kvm_x86_ops.complete_emulated_msr(vcpu, r);
 }
 EXPORT_SYMBOL_GPL(kvm_emulate_wrmsr);