In its current form, the virtio protocol for block devices (virtio-blk) is not aware of zoned block devices (ZBDs) but it allows the driver to successfully scan a host-managed drive provided by the virtio block device. As the result, the host-managed drive is recognized by the virtio driver as a regular, non-zoned drive that will operate erroneously under the most common write workloads. Host-aware ZBDs are currently usable, but their performance may not be optimal because the driver can only see them as non-zoned block devices. To fix this, the virtio-blk protocol needs to be extended to add the capabilities to convey the zone characteristics of ZBDs at the device side to the driver and to provide support for ZBD-specific commands - Report Zones, four zone operations (Open, Close, Finish and Reset) and (optionally) Zone Append. The required virtio-blk protocol extensions are currently under review at OASIS Technical Committee and the specification patch is linked at https://github.com/oasis-tcs/virtio-spec/issues/143 . The QEMU zoned device code that implements these protocol extensions has been developed by Sam Li, an intern, as a part of Outreachy community mentorship initiative. The latest version of the QEMU patchset can be found here: https://lists.gnu.org/archive/html/qemu-devel/2022-09/msg01469.html This patch series modifies the virtio block driver code to implement the above virtio specification extensions. This patch has been tested to be compatible with the QEMU implementation referred above. Dmitry Fomichev (3): virtio-blk: use a helper to handle request queuing errors virtio-blk: add a placeholder for secure erase config virtio-blk: add support for zoned block devices drivers/block/virtio_blk.c | 410 +++++++++++++++++++++++++++++--- include/uapi/linux/virtio_blk.h | 109 +++++++++ 2 files changed, 488 insertions(+), 31 deletions(-) -- 2.34.1
