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[PATCH v9 5/5] docs/zoned-storage:add zoned emulation use case

From: Sam Li
Subject: [PATCH v9 5/5] docs/zoned-storage:add zoned emulation use case
Date: Mon, 27 Mar 2023 22:45:53 +0800

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>
 docs/devel/zoned-storage.rst | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/docs/devel/zoned-storage.rst b/docs/devel/zoned-storage.rst
index 6a36133e51..05ecf3729c 100644
--- a/docs/devel/zoned-storage.rst
+++ b/docs/devel/zoned-storage.rst
@@ -41,3 +41,20 @@ 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.

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