Introduce routines to flush and restore device ITT and their
interrupt table entries (ITE).
The routines will be called on device table flush and
restore.
Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
v2: creation
---
virt/kvm/arm/vgic/vgic-its.c | 99 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 99 insertions(+)
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 1060125..be9e8ed 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -1748,6 +1748,105 @@ static int vgic_its_restore_pending_tables(struct vgic_its *its)
return -ENXIO;
}
+static int vgic_its_flush_ite(struct vgic_its *its, struct its_device *dev,
+ struct its_ite *ite, gpa_t gpa)
+{
+ struct kvm *kvm = its->dev->kvm;
+ u32 next_offset;
+ u64 val;
+
+ next_offset = compute_next_eventid_offset(&dev->itt_head, ite);
+ val = ((u64)next_offset << 48) | ((u64)ite->lpi << 16) |
+ ite->collection->collection_id;
+ val = cpu_to_le64(val);
+ return kvm_write_guest(kvm, gpa, &val, VITS_ESZ);
+}
+
+/**
+ * vgic_its_restore_ite - restore an interrupt translation entry
+ * @event_id: id used for indexing
+ * @ptr: kernel VA where the 8 byte ITE is located
+ * @opaque: pointer to the its_device
+ * @next: id offset to the next entry
+ */
+static int vgic_its_restore_ite(struct vgic_its *its, u32 event_id,
+ void *ptr, void *opaque, u32 *next)
+{
+ struct its_device *dev = (struct its_device *)opaque;
+ struct its_collection *collection;
+ struct kvm *kvm = its->dev->kvm;
+ u64 val, *p = (u64 *)ptr;
+ struct vgic_irq *irq;
+ u32 coll_id, lpi_id;
+ struct its_ite *ite;
+ int ret;
+
+ val = *p;
+ *next = 1;
+
+ val = le64_to_cpu(val);
+
+ coll_id = val & GENMASK_ULL(15, 0);
+ lpi_id = (val & GENMASK_ULL(47, 16)) >> 16;
+
+ if (!lpi_id)
+ return 0;
+
+ *next = (val & GENMASK_ULL(63, 48)) >> 48;
+
+ collection = find_collection(its, coll_id);
+ if (!collection)
+ return -EINVAL;
+
+ ret = vgic_its_alloc_ite(dev, &ite, collection,
+ lpi_id, event_id);
+ if (ret)
+ return ret;
+
+ irq = vgic_add_lpi(kvm, lpi_id);
+ if (IS_ERR(irq))
+ return PTR_ERR(irq);
+ ite->irq = irq;
+
+ /* restore the configuration of the LPI */
+ ret = update_lpi_config(kvm, irq, NULL);
+ if (ret)
+ return ret;
+
+ update_affinity_ite(kvm, ite);
+}
+
+static int vgic_its_flush_itt(struct vgic_its *its, struct its_device *device)
+{
+ gpa_t base = device->itt_addr;
+ struct its_ite *ite;
+ int ret;
+
+ list_for_each_entry(ite, &device->itt_head, ite_list) {
+ gpa_t gpa = base + ite->event_id * VITS_ESZ;
+
+ ret = vgic_its_flush_ite(its, device, ite, gpa);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+static int vgic_its_restore_itt(struct vgic_its *its,
+ struct its_device *dev)
+{
+ size_t max_size = (2 << dev->nb_eventid_bits) * VITS_ESZ;
+ gpa_t base = dev->itt_addr;
+ int ret;
+
+ ret = lookup_table(its, base, max_size, VITS_ESZ, 0,
+ vgic_its_restore_ite, dev);
+
+ if (ret < 0)
+ return ret;
+ return 0;
+}
+
/**
* vgic_its_flush_device_tables - flush the device table and all ITT
* into guest RAM
--
2.5.5
