diff options
| author | Changyuan Lyu <changyuanl@google.com> | 2023-12-20 12:49:06 -0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2024-01-10 13:01:37 -0500 |
| commit | 35967bdcff325f4572b21b0d0005318da7e03f53 (patch) | |
| tree | 2ce3ee42f6bd8a4eb11cf8b7916851c48c0cd306 /include/uapi | |
| parent | b12fbc3f787e3d7e47af274a761fdee6e867bc7d (diff) | |
virtio_pmem: support feature SHMEM_REGION
This patch adds the support for feature VIRTIO_PMEM_F_SHMEM_REGION
(virtio spec v1.2 section 5.19.5.2 [1]).
During feature negotiation, if VIRTIO_PMEM_F_SHMEM_REGION is offered
by the device, the driver looks for a shared memory region of id 0.
If it is found, this feature is understood. Otherwise, this feature
bit is cleared.
During probe, if VIRTIO_PMEM_F_SHMEM_REGION has been negotiated,
virtio pmem ignores the `start` and `size` fields in device config
and uses the physical address range of shared memory region 0.
[1] https://docs.oasis-open.org/virtio/virtio/v1.2/csd01/virtio-v1.2-csd01.html#x1-6480002
Signed-off-by: Changyuan Lyu <changyuanl@google.com>
Message-Id: <20231220204906.566922-1-changyuanl@google.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/virtio_pmem.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/uapi/linux/virtio_pmem.h b/include/uapi/linux/virtio_pmem.h index d676b3620383..ede4f3564977 100644 --- a/include/uapi/linux/virtio_pmem.h +++ b/include/uapi/linux/virtio_pmem.h @@ -14,6 +14,13 @@ #include <linux/virtio_ids.h> #include <linux/virtio_config.h> +/* Feature bits */ +/* guest physical address range will be indicated as shared memory region 0 */ +#define VIRTIO_PMEM_F_SHMEM_REGION 0 + +/* shmid of the shared memory region corresponding to the pmem */ +#define VIRTIO_PMEM_SHMEM_REGION_ID 0 + struct virtio_pmem_config { __le64 start; __le64 size; |