On Fri, Aug 26, 2022 at 11:15:29PM +0800, Sam Li wrote: > Zoned Block Devices (ZBDs) devide the LBA space to block regions called zones > that are larger than the LBA size. It can only allow sequential writes, which > reduces write amplification in SSD, leading to higher throughput and increased > capacity. More details about ZBDs can be found at: > > https://zonedstorage.io/docs/introduction/zoned-storage > > The zoned device support aims to let guests (virtual machines) access zoned > storage devices on the host (hypervisor) through a virtio-blk device. This > involves extending QEMU's block layer and virtio-blk emulation code. In its > current status, the virtio-blk device is not aware of ZBDs but the guest sees > host-managed drives as regular drive that will runs correctly under the most > common write workloads. > > This patch series extend the block layer APIs with the minimum set of zoned > commands that are necessary to support zoned devices. The commands are - > Report > Zones, four zone operations and Zone Append (developing). > > It can be tested on a null_blk device using qemu-io or qemu-iotests. For > example, the command line for zone report using qemu-io is: > $ path/to/qemu-io --image-opts -n > driver=zoned_host_device,filename=/dev/nullb0 > -c "zrp offset nr_zones" > > v8: > - address review comments > * solve patch conflicts and merge sysfs helper funcations into one patch > * add cache.direct=on check in config
Hi Sam, I have left a few comments. Stefan
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