| Message ID | 20230324105418.3752-2-faithilikerun@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v9,1/5] include: update virtio_blk headers to v6.3-rc1 | expand |
Sam Li <faithilikerun@gmail.com> 于2023年3月24日周五 18:54写道： > > 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. > -- > 2.39.2 >
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.
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(+)