KVM: Move vcpu_load to arch-specific kvm_arch_vcpu_ioctl_set_mpstate

Move vcpu_load() and vcpu_put() into the architecture specific
implementations of kvm_arch_vcpu_ioctl_set_mpstate().
Reviewed-by: NDavid Hildenbrand <david@redhat.com>
Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: NCornelia Huck <cohuck@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

arch/s390/kvm/kvm-s390.c

@@ -2850,6 +2850,8 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 {
 	int rc = 0;
 
+	vcpu_load(vcpu);
+
 	/* user space knows about this interface - let it control the state */
 	vcpu->kvm->arch.user_cpu_state_ctrl = 1;
 
@@ -2867,6 +2869,7 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 		rc = -ENXIO;
 	}
 
+	vcpu_put(vcpu);
 	return rc;
 }
 

arch/x86/kvm/x86.c

@@ -7481,15 +7481,19 @@ int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 				    struct kvm_mp_state *mp_state)
 {
+	int ret = -EINVAL;
+
+	vcpu_load(vcpu);
+
 	if (!lapic_in_kernel(vcpu) &&
 	    mp_state->mp_state != KVM_MP_STATE_RUNNABLE)
-		return -EINVAL;
+		goto out;
 
 	/* INITs are latched while in SMM */
 	if ((is_smm(vcpu) || vcpu->arch.smi_pending) &&
 	    (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED ||
 	     mp_state->mp_state == KVM_MP_STATE_INIT_RECEIVED))
-		return -EINVAL;
+		goto out;
 
 	if (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED) {
 		vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
@@ -7497,7 +7501,11 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 	} else
 		vcpu->arch.mp_state = mp_state->mp_state;
 	kvm_make_request(KVM_REQ_EVENT, vcpu);
-	return 0;
+
+	ret = 0;
+out:
+	vcpu_put(vcpu);
+	return ret;
 }
 
 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index,

virt/kvm/arm/arm.c

@@ -395,6 +395,10 @@ int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 				    struct kvm_mp_state *mp_state)
 {
+	int ret = 0;
+
+	vcpu_load(vcpu);
+
 	switch (mp_state->mp_state) {
 	case KVM_MP_STATE_RUNNABLE:
 		vcpu->arch.power_off = false;
@@ -403,10 +407,11 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 		vcpu_power_off(vcpu);
 		break;
 	default:
-		return -EINVAL;
+		ret = -EINVAL;
 	}
 
-	return 0;
+	vcpu_put(vcpu);
+	return ret;
 }
 
 /**

virt/kvm/kvm_main.c

@@ -2649,9 +2649,7 @@ static long kvm_vcpu_ioctl(struct file *filp,
 		r = -EFAULT;
 		if (copy_from_user(&mp_state, argp, sizeof(mp_state)))
 			goto out;
-		vcpu_load(vcpu);
 		r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
-		vcpu_put(vcpu);
 		break;
 	}
 	case KVM_TRANSLATE: {