[PATCH v2 7/9] virtio-mem: use a single dynamic memory group for a single virtio-mem device

David Hildenbrand
2021-07-23T12:53:46Z

Let's use a single dynamic memory group.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
drivers/virtio/virtio_mem.c | 22 +++++++++++++++++++---
1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index 774986695dc4..19036922f7ef 100644
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c
@@ -143,6 +143,8 @@ struct virtio_mem {
* add_memory_driver_managed().
*/
const char *resource_name;
+ /* Memory group identification. */
+ int mgid;

/*
* We don't want to add too much memory if it's not getting onlined,
@@ -626,8 +628,8 @@ static int virtio_mem_add_memory(struct virtio_mem *vm, uint64_t addr,
addr + size - 1);
/* Memory might get onlined immediately. */
atomic64_add(size, &vm->offline_size);
- rc = add_memory_driver_managed(vm->nid, addr, size, vm->resource_name,
- MHP_MERGE_RESOURCE);
+ rc = add_memory_driver_managed(vm->mgid, addr, size, vm->resource_name,
+ MHP_MERGE_RESOURCE | MHP_NID_IS_MGID);
if (rc) {
atomic64_sub(size, &vm->offline_size);
dev_warn(&vm->vdev->dev, "adding memory failed: %d\n", rc);
@@ -2562,6 +2564,7 @@ static bool virtio_mem_has_memory_added(struct virtio_mem *vm)
static int virtio_mem_probe(struct virtio_device *vdev)
{
struct virtio_mem *vm;
+ uint64_t unit_pages;
int rc;

BUILD_BUG_ON(sizeof(struct virtio_mem_req) != 24);
@@ -2596,6 +2599,16 @@ static int virtio_mem_probe(struct virtio_device *vdev)
if (rc)
goto out_del_vq;

+ /* use a single dynamic memory group to cover the whole memory device */
+ if (vm->in_sbm)
+ unit_pages = PHYS_PFN(memory_block_size_bytes());
+ else
+ unit_pages = PHYS_PFN(vm->bbm.bb_size);
+ rc = register_dynamic_memory_group(vm->nid, unit_pages);
+ if (rc < 0)
+ goto out_del_resource;
+ vm->mgid = rc;
+
/*
* If we still have memory plugged, we have to unplug all memory first.
* Registering our parent resource makes sure that this memory isn't
@@ -2610,7 +2623,7 @@ static int virtio_mem_probe(struct virtio_device *vdev)
vm->memory_notifier.notifier_call = virtio_mem_memory_notifier_cb;
rc = register_memory_notifier(&vm->memory_notifier);
if (rc)
- goto out_del_resource;
+ goto out_unreg_group;
rc = register_virtio_mem_device(vm);
if (rc)
goto out_unreg_mem;
@@ -2624,6 +2637,8 @@ static int virtio_mem_probe(struct virtio_device *vdev)
return 0;
out_unreg_mem:
unregister_memory_notifier(&vm->memory_notifier);
+out_unreg_group:
+ unregister_memory_group(vm->mgid);
out_del_resource:
virtio_mem_delete_resource(vm);
out_del_vq:
@@ -2688,6 +2703,7 @@ static void virtio_mem_remove(struct virtio_device *vdev)
} else {
virtio_mem_delete_resource(vm);
kfree_const(vm->resource_name);
+ unregister_memory_group(vm->mgid);
}

/* remove all tracking data - no locking needed */
--
2.31.1