From: Sascha Bischoff <Sascha.Bischoff@arm.com>
Date: Thu, 19 Mar 2026 15:58:48 +0000 (+0000)
Subject: KVM: arm64: gic-v5: Introduce kvm_arm_vgic_v5_ops and register them
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=37a25294682d28ef3bd131566602450a72c4d839;p=thirdparty%2Fkernel%2Flinux.git

KVM: arm64: gic-v5: Introduce kvm_arm_vgic_v5_ops and register them

Only the KVM_DEV_ARM_VGIC_GRP_CTRL->KVM_DEV_ARM_VGIC_CTRL_INIT op is
currently supported. All other ops are stubbed out.

Co-authored-by: Timothy Hayes <timothy.hayes@arm.com>
Signed-off-by: Timothy Hayes <timothy.hayes@arm.com>
Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20260319154937.3619520-36-sascha.bischoff@arm.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
---

diff --git a/arch/arm64/kvm/vgic/vgic-kvm-device.c b/arch/arm64/kvm/vgic/vgic-kvm-device.c
index b12ba99a423e5..772da54c1518b 100644
--- a/arch/arm64/kvm/vgic/vgic-kvm-device.c
+++ b/arch/arm64/kvm/vgic/vgic-kvm-device.c
@@ -336,6 +336,10 @@ int kvm_register_vgic_device(unsigned long type)
 			break;
 		ret = kvm_vgic_register_its_device();
 		break;
+	case KVM_DEV_TYPE_ARM_VGIC_V5:
+		ret = kvm_register_device_ops(&kvm_arm_vgic_v5_ops,
+					      KVM_DEV_TYPE_ARM_VGIC_V5);
+		break;
 	}
 
 	return ret;
@@ -715,3 +719,73 @@ struct kvm_device_ops kvm_arm_vgic_v3_ops = {
 	.get_attr = vgic_v3_get_attr,
 	.has_attr = vgic_v3_has_attr,
 };
+
+static int vgic_v5_set_attr(struct kvm_device *dev,
+			    struct kvm_device_attr *attr)
+{
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_ADDR:
+	case KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS:
+	case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
+		return -ENXIO;
+	case KVM_DEV_ARM_VGIC_GRP_CTRL:
+		switch (attr->attr) {
+		case KVM_DEV_ARM_VGIC_CTRL_INIT:
+			return vgic_set_common_attr(dev, attr);
+		default:
+			return -ENXIO;
+		}
+	default:
+		return -ENXIO;
+	}
+
+}
+
+static int vgic_v5_get_attr(struct kvm_device *dev,
+			    struct kvm_device_attr *attr)
+{
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_ADDR:
+	case KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS:
+	case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
+		return -ENXIO;
+	case KVM_DEV_ARM_VGIC_GRP_CTRL:
+		switch (attr->attr) {
+		case KVM_DEV_ARM_VGIC_CTRL_INIT:
+			return vgic_get_common_attr(dev, attr);
+		default:
+			return -ENXIO;
+		}
+	default:
+		return -ENXIO;
+	}
+}
+
+static int vgic_v5_has_attr(struct kvm_device *dev,
+			    struct kvm_device_attr *attr)
+{
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_ADDR:
+	case KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS:
+	case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
+		return -ENXIO;
+	case KVM_DEV_ARM_VGIC_GRP_CTRL:
+		switch (attr->attr) {
+		case KVM_DEV_ARM_VGIC_CTRL_INIT:
+			return 0;
+		default:
+			return -ENXIO;
+		}
+	default:
+		return -ENXIO;
+	}
+}
+
+struct kvm_device_ops kvm_arm_vgic_v5_ops = {
+	.name = "kvm-arm-vgic-v5",
+	.create = vgic_create,
+	.destroy = vgic_destroy,
+	.set_attr = vgic_v5_set_attr,
+	.get_attr = vgic_v5_get_attr,
+	.has_attr = vgic_v5_has_attr,
+};
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 6b76e7a6f4c22..779d9ed85cbfd 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -2366,6 +2366,7 @@ void kvm_unregister_device_ops(u32 type);
 extern struct kvm_device_ops kvm_mpic_ops;
 extern struct kvm_device_ops kvm_arm_vgic_v2_ops;
 extern struct kvm_device_ops kvm_arm_vgic_v3_ops;
+extern struct kvm_device_ops kvm_arm_vgic_v5_ops;
 
 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT