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[PULL 17/17] docs/zoned-storage:add zoned emulation use case
From: |
Stefan Hajnoczi |
Subject: |
[PULL 17/17] docs/zoned-storage:add zoned emulation use case |
Date: |
Fri, 28 Apr 2023 08:39:54 -0400 |
From: Sam Li <faithilikerun@gmail.com>
Add the documentation about the example of using virtio-blk driver
to pass the zoned block devices through to the guest.
Signed-off-by: Sam Li <faithilikerun@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
[Fix rST syntax
--Stefan]
Message-Id: <20230407082528.18841-6-faithilikerun@gmail.com>
---
docs/devel/zoned-storage.rst | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/docs/devel/zoned-storage.rst b/docs/devel/zoned-storage.rst
index da78db2783..e02500c8a3 100644
--- a/docs/devel/zoned-storage.rst
+++ b/docs/devel/zoned-storage.rst
@@ -41,3 +41,22 @@ APIs for zoned storage emulation or testing.
For example, to test zone_report on a null_blk device using qemu-io is::
$ path/to/qemu-io --image-opts -n driver=host_device,filename=/dev/nullb0 -c
"zrp offset nr_zones"
+
+To expose the host's zoned block device through virtio-blk, the command line
+can be (includes the -device parameter)::
+
+ -blockdev
node-name=drive0,driver=host_device,filename=/dev/nullb0,cache.direct=on \
+ -device virtio-blk-pci,drive=drive0
+
+Or only use the -drive parameter::
+
+ -driver driver=host_device,file=/dev/nullb0,if=virtio,cache.direct=on
+
+Additionally, QEMU has several ways of supporting zoned storage, including:
+(1) Using virtio-scsi: --device scsi-block allows for the passing through of
+SCSI ZBC devices, enabling the attachment of ZBC or ZAC HDDs to QEMU.
+(2) PCI device pass-through: While NVMe ZNS emulation is available for testing
+purposes, it cannot yet pass through a zoned device from the host. To pass on
+the NVMe ZNS device to the guest, use VFIO PCI pass the entire NVMe PCI adapter
+through to the guest. Likewise, an HDD HBA can be passed on to QEMU all HDDs
+attached to the HBA.
--
2.40.0
- [PULL 06/17] iotests: test new zone operations, (continued)
- [PULL 06/17] iotests: test new zone operations, Stefan Hajnoczi, 2023/04/28
- [PULL 12/17] block: add some trace events for zone append, Stefan Hajnoczi, 2023/04/28
- [PULL 11/17] qemu-iotests: test zone append operation, Stefan Hajnoczi, 2023/04/28
- [PULL 09/17] file-posix: add tracking of the zone write pointers, Stefan Hajnoczi, 2023/04/28
- [PULL 10/17] block: introduce zone append write for zoned devices, Stefan Hajnoczi, 2023/04/28
- [PULL 08/17] docs/zoned-storage: add zoned device documentation, Stefan Hajnoczi, 2023/04/28
- [PULL 14/17] virtio-blk: add zoned storage emulation for zoned devices, Stefan Hajnoczi, 2023/04/28
- [PULL 15/17] block: add accounting for zone append operation, Stefan Hajnoczi, 2023/04/28
- [PULL 13/17] include: update virtio_blk headers to v6.3-rc1, Stefan Hajnoczi, 2023/04/28
- [PULL 16/17] virtio-blk: add some trace events for zoned emulation, Stefan Hajnoczi, 2023/04/28
- [PULL 17/17] docs/zoned-storage:add zoned emulation use case,
Stefan Hajnoczi <=
- Re: [PULL 00/17] Block patches, Richard Henderson, 2023/04/29