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-rw-r--r--virt/kvm/arm/vgic/vgic-its.c77
-rw-r--r--virt/kvm/arm/vgic/vgic.h6
2 files changed, 83 insertions, 0 deletions
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 1408c88d063e..d8e8f14135b4 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -437,6 +437,65 @@ static unsigned long vgic_mmio_read_its_idregs(struct kvm *kvm,
return 0;
}
+/*
+ * Find the target VCPU and the LPI number for a given devid/eventid pair
+ * and make this IRQ pending, possibly injecting it.
+ * Must be called with the its_lock mutex held.
+ */
+static void vgic_its_trigger_msi(struct kvm *kvm, struct vgic_its *its,
+ u32 devid, u32 eventid)
+{
+ struct its_itte *itte;
+
+ if (!its->enabled)
+ return;
+
+ itte = find_itte(its, devid, eventid);
+ /* Triggering an unmapped IRQ gets silently dropped. */
+ if (itte && its_is_collection_mapped(itte->collection)) {
+ struct kvm_vcpu *vcpu;
+
+ vcpu = kvm_get_vcpu(kvm, itte->collection->target_addr);
+ if (vcpu && vcpu->arch.vgic_cpu.lpis_enabled) {
+ spin_lock(&itte->irq->irq_lock);
+ itte->irq->pending = true;
+ vgic_queue_irq_unlock(kvm, itte->irq);
+ }
+ }
+}
+
+/*
+ * Queries the KVM IO bus framework to get the ITS pointer from the given
+ * doorbell address.
+ * We then call vgic_its_trigger_msi() with the decoded data.
+ */
+int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
+{
+ u64 address;
+ struct kvm_io_device *kvm_io_dev;
+ struct vgic_io_device *iodev;
+
+ if (!vgic_has_its(kvm))
+ return -ENODEV;
+
+ if (!(msi->flags & KVM_MSI_VALID_DEVID))
+ return -EINVAL;
+
+ address = (u64)msi->address_hi << 32 | msi->address_lo;
+
+ kvm_io_dev = kvm_io_bus_get_dev(kvm, KVM_MMIO_BUS, address);
+ if (!kvm_io_dev)
+ return -ENODEV;
+
+ iodev = container_of(kvm_io_dev, struct vgic_io_device, dev);
+
+ mutex_lock(&iodev->its->its_lock);
+ vgic_its_trigger_msi(kvm, iodev->its, msi->devid, msi->data);
+ mutex_unlock(&iodev->its->its_lock);
+
+ return 0;
+}
+
/* Requires the its_lock to be held. */
static void its_free_itte(struct kvm *kvm, struct its_itte *itte)
{
@@ -897,6 +956,21 @@ static int vgic_its_cmd_handle_movall(struct kvm *kvm, struct vgic_its *its,
}
/*
+ * The INT command injects the LPI associated with that DevID/EvID pair.
+ * Must be called with the its_lock mutex held.
+ */
+static int vgic_its_cmd_handle_int(struct kvm *kvm, struct vgic_its *its,
+ u64 *its_cmd)
+{
+ u32 msi_data = its_cmd_get_id(its_cmd);
+ u64 msi_devid = its_cmd_get_deviceid(its_cmd);
+
+ vgic_its_trigger_msi(kvm, its, msi_devid, msi_data);
+
+ return 0;
+}
+
+/*
* This function is called with the its_cmd lock held, but the ITS data
* structure lock dropped.
*/
@@ -932,6 +1006,9 @@ static int vgic_its_handle_command(struct kvm *kvm, struct vgic_its *its,
case GITS_CMD_MOVALL:
ret = vgic_its_cmd_handle_movall(kvm, its, its_cmd);
break;
+ case GITS_CMD_INT:
+ ret = vgic_its_cmd_handle_int(kvm, its, its_cmd);
+ break;
case GITS_CMD_INV:
ret = vgic_its_cmd_handle_inv(kvm, its, its_cmd);
break;
diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
index ee348deb8737..9d557f25cbfc 100644
--- a/virt/kvm/arm/vgic/vgic.h
+++ b/virt/kvm/arm/vgic/vgic.h
@@ -78,6 +78,7 @@ int vgic_v3_map_resources(struct kvm *kvm);
int vgic_register_redist_iodevs(struct kvm *kvm, gpa_t dist_base_address);
bool vgic_has_its(struct kvm *kvm);
void vgic_enable_lpis(struct kvm_vcpu *vcpu);
+int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi);
#else
static inline void vgic_v3_process_maintenance(struct kvm_vcpu *vcpu)
{
@@ -138,6 +139,11 @@ static inline bool vgic_has_its(struct kvm *kvm)
static inline void vgic_enable_lpis(struct kvm_vcpu *vcpu)
{
}
+
+static inline int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
+{
+ return -ENODEV;
+}
#endif
int kvm_register_vgic_device(unsigned long type);