The merged patch series to support zoned block devices in virtio-blk is not the most up to date version. The merged patch can be found at https://lore.kernel.org/linux-block/20221016034127.330942-3-dmitry.fomichev@wdc.com/ but the latest and reviewed version is https://lore.kernel.org/linux-block/20221110053952.3378990-3-dmitry.fomichev@wdc.com/ The reason is apparently that the correct mailing lists and maintainers were not copied. The differences between the two are mostly cleanups, but there is one change that is very important in terms of compatibility with the approved virtio-zbd specification. Before it was approved, the OASIS virtio spec had a change in VIRTIO_BLK_T_ZONE_APPEND request layout that is not reflected in the current virtio-blk driver code. In the running code, the status is the first byte of the in-header that is followed by some pad bytes and the u64 that carries the sector at which the data has been written to the zone back to the driver, aka the append sector. This layout turned out to be problematic for implementing in QEMU and the request status byte has been eventually made the last byte of the in-header. The current code doesn't expect that and this causes the append sector value always come as zero to the block layer. This needs to be fixed ASAP.
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| @@ -140,11 +140,11 @@ struct virtio_blk_config { · 139 unmodified lines | |||
| 140 | 140 | ||
| 141 | /* Zoned block device characteristics (if VIRTIO_BLK_F_ZONED) */ | 141 | /* Zoned block device characteristics (if VIRTIO_BLK_F_ZONED) */ |
| 142 | struct virtio_blk_zoned_characteristics { | 142 | struct virtio_blk_zoned_characteristics { |
| 143 | __le32 zone_sectors; | 143 | __virtio32 zone_sectors; |
| 144 | __le32 max_open_zones; | 144 | __virtio32 max_open_zones; |
| 145 | __le32 max_active_zones; | 145 | __virtio32 max_active_zones; |
| 146 | __le32 max_append_sectors; | 146 | __virtio32 max_append_sectors; |
| 147 | __le32 write_granularity; | 147 | __virtio32 write_granularity; |
| 148 | __u8 model; | 148 | __u8 model; |
| 149 | __u8 unused2[3]; | 149 | __u8 unused2[3]; |
| 150 | } zoned; | 150 | } zoned; |
| @@ -241,11 +241,11 @@ struct virtio_blk_outhdr { · 90 unmodified lines | |||
| 241 | */ | 241 | */ |
| 242 | struct virtio_blk_zone_descriptor { | 242 | struct virtio_blk_zone_descriptor { |
| 243 | /* Zone capacity */ | 243 | /* Zone capacity */ |
| 244 | __le64 z_cap; | 244 | __virtio64 z_cap; |
| 245 | /* The starting sector of the zone */ | 245 | /* The starting sector of the zone */ |
| 246 | __le64 z_start; | 246 | __virtio64 z_start; |
| 247 | /* Zone write pointer position in sectors */ | 247 | /* Zone write pointer position in sectors */ |
| 248 | __le64 z_wp; | 248 | __virtio64 z_wp; |
| 249 | /* Zone type */ | 249 | /* Zone type */ |
| 250 | __u8 z_type; | 250 | __u8 z_type; |
| 251 | /* Zone state */ | 251 | /* Zone state */ |
| @@ -254,7 +254,7 @@ struct virtio_blk_zone_descriptor { · 2 unmodified lines | |||
| 254 | }; | 254 | }; |
| 255 | 255 | ||
| 256 | struct virtio_blk_zone_report { | 256 | struct virtio_blk_zone_report { |
| 257 | __le64 nr_zones; | 257 | __virtio64 nr_zones; |
| 258 | __u8 reserved[56]; | 258 | __u8 reserved[56]; |
| 259 | struct virtio_blk_zone_descriptor zones[]; | 259 | struct virtio_blk_zone_descriptor zones[]; |
| 260 | }; | 260 | }; |