Hi all,
These 2 patches added virtio-nvme to kernel and qemu,
basically modified from virtio-blk and nvme code.
As title said, request for your comments.
Play it in Qemu with:
-drive file=disk.img,format=raw,if=none,id=D22 \
-device virtio-nvme-pci,drive=D22,serial=1234,num_queues=4
The goal is to have a full NVMe stack from VM guest(virtio-nvme)
to host(vhost_nvme) to LIO NVMe-over-fabrics target.
Now there are lots of duplicated code with linux/nvme-core.c and qemu/nvme.c.
The ideal result is to have a multi level NVMe stack(similar as SCSI).
So we can re-use the nvme code, for example
.-------------------------.
| NVMe device register |
Upper level | NVMe protocol process |
| |
'-------------------------'
.-----------. .-----------. .------------------.
Lower level | PCIe | | VIRTIO | |NVMe over Fabrics |
| | | | |initiator |
'-----------' '-----------' '------------------'
todo:
- tune performance. Should be as good as virtio-blk/virtio-scsi
- support discard/flush/integrity
- need Redhat's help for the VIRTIO_ID_NVME pci id
- multi level NVMe stack
Code also available at:
http://www.minggr.net/cgit/cgit.cgi/linux/commit/?h=virtio-nvme/v1
http://www.minggr.net/cgit/cgit.cgi/qemu/log/?h=virtio-nvme/v1
Thanks,
Ming
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