KVM: Move vcpu_load to arch-specific kvm_arch_vcpu_ioctl_set_guest_debug

Move vcpu_load() and vcpu_put() into the architecture specific
implementations of kvm_arch_vcpu_ioctl_set_guest_debug().
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/arm64/kvm/guest.c

@@ -361,10 +361,16 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 					struct kvm_guest_debug *dbg)
 {
+	int ret = 0;
+
+	vcpu_load(vcpu);
+
 	trace_kvm_set_guest_debug(vcpu, dbg->control);
 
-	if (dbg->control & ~KVM_GUESTDBG_VALID_MASK)
-		return -EINVAL;
+	if (dbg->control & ~KVM_GUESTDBG_VALID_MASK) {
+		ret = -EINVAL;
+		goto out;
+	}
 
 	if (dbg->control & KVM_GUESTDBG_ENABLE) {
 		vcpu->guest_debug = dbg->control;
@@ -378,7 +384,10 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 		/* If not enabled clear all flags */
 		vcpu->guest_debug = 0;
 	}
-	return 0;
+
+out:
+	vcpu_put(vcpu);
+	return ret;
 }
 
 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,

arch/powerpc/kvm/book3s.c

@@ -755,7 +755,9 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 					struct kvm_guest_debug *dbg)
 {
+	vcpu_load(vcpu);
 	vcpu->guest_debug = dbg->control;
+	vcpu_put(vcpu);
 	return 0;
 }
 

arch/powerpc/kvm/booke.c

@@ -2016,12 +2016,15 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 {
 	struct debug_reg *dbg_reg;
 	int n, b = 0, w = 0;
+	int ret = 0;
+
+	vcpu_load(vcpu);
 
 	if (!(dbg->control & KVM_GUESTDBG_ENABLE)) {
 		vcpu->arch.dbg_reg.dbcr0 = 0;
 		vcpu->guest_debug = 0;
 		kvm_guest_protect_msr(vcpu, MSR_DE, false);
-		return 0;
+		goto out;
 	}
 
 	kvm_guest_protect_msr(vcpu, MSR_DE, true);
@@ -2053,8 +2056,9 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 #endif
 
 	if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
-		return 0;
+		goto out;
 
+	ret = -EINVAL;
 	for (n = 0; n < (KVMPPC_BOOKE_IAC_NUM + KVMPPC_BOOKE_DAC_NUM); n++) {
 		uint64_t addr = dbg->arch.bp[n].addr;
 		uint32_t type = dbg->arch.bp[n].type;
@@ -2065,21 +2069,24 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 		if (type & ~(KVMPPC_DEBUG_WATCH_READ |
 			     KVMPPC_DEBUG_WATCH_WRITE |
 			     KVMPPC_DEBUG_BREAKPOINT))
-			return -EINVAL;
+			goto out;
 
 		if (type & KVMPPC_DEBUG_BREAKPOINT) {
 			/* Setting H/W breakpoint */
 			if (kvmppc_booke_add_breakpoint(dbg_reg, addr, b++))
-				return -EINVAL;
+				goto out;
 		} else {
 			/* Setting H/W watchpoint */
 			if (kvmppc_booke_add_watchpoint(dbg_reg, addr,
 							type, w++))
-				return -EINVAL;
+				goto out;
 		}
 	}
 
-	return 0;
+	ret = 0;
+out:
+	vcpu_put(vcpu);
+	return ret;
 }
 
 void kvmppc_booke_vcpu_load(struct kvm_vcpu *vcpu, int cpu)

arch/s390/kvm/kvm-s390.c

@@ -2801,13 +2801,19 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 {
 	int rc = 0;
 
+	vcpu_load(vcpu);
+
 	vcpu->guest_debug = 0;
 	kvm_s390_clear_bp_data(vcpu);
 
-	if (dbg->control & ~VALID_GUESTDBG_FLAGS)
-		return -EINVAL;
-	if (!sclp.has_gpere)
-		return -EINVAL;
+	if (dbg->control & ~VALID_GUESTDBG_FLAGS) {
+		rc = -EINVAL;
+		goto out;
+	}
+	if (!sclp.has_gpere) {
+		rc = -EINVAL;
+		goto out;
+	}
 
 	if (dbg->control & KVM_GUESTDBG_ENABLE) {
 		vcpu->guest_debug = dbg->control;
@@ -2827,6 +2833,8 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 		atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
 	}
 
+out:
+	vcpu_put(vcpu);
 	return rc;
 }
 

arch/x86/kvm/x86.c

@@ -7625,6 +7625,8 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 	unsigned long rflags;
 	int i, r;
 
+	vcpu_load(vcpu);
+
 	if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) {
 		r = -EBUSY;
 		if (vcpu->arch.exception.pending)
@@ -7670,7 +7672,7 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 	r = 0;
 
 out:
-
+	vcpu_put(vcpu);
 	return r;
 }
 

virt/kvm/kvm_main.c

@@ -2673,9 +2673,7 @@ static long kvm_vcpu_ioctl(struct file *filp,
 		r = -EFAULT;
 		if (copy_from_user(&dbg, argp, sizeof(dbg)))
 			goto out;
-		vcpu_load(vcpu);
 		r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
-		vcpu_put(vcpu);
 		break;
 	}
 	case KVM_SET_SIGNAL_MASK: {