On Wed, Jul 15, 2015 at 1:26 PM, Keith Busch <keith.busch@xxxxxxxxx> wrote: > On Wed, 15 Jul 2015, Ming Lin wrote: >> >> On Tue, Jul 14, 2015 at 10:58 AM, Ming Lin <mlin@xxxxxxxxxx> wrote: >>> >>> Hi, >>> >>> I heard LIO target for NVMe is under development. >>> I wonder if virtio-nvme(similar as virtio-scsi) make sense? >>> >>> For example, >>> http://www.minggr.net/wp-content/uploads/2015/07/virtio_nvme.png >> >> >> Hi Keith, >> >> Is virtio-nvme probably a valuable thing to to? > > > Hi Ming, > > You're looking for a qemu NVMe device? There is an emulated one there > already, but it's just called 'nvme' and a guest machine can use it > with the mainline linux nvme driver. No. I'm thinking of implementing things similar as virtio-scsi/vhost-scsi for guest to use host's nvme device more efficiently, as this picture shows: http://www.minggr.net/wp-content/uploads/2015/07/virtio_nvme.png For host's device: /dev/nvme0n1, I know we can use LIO target's IBLOCK to export it, then guest to access it via virtio-scsi/vhost-scsi. Guest will see, for example, /dev/sda Is this use case, guest actually speaks scsi protocol. I'm thinking is there any benefit for guest to speak nvme protocol directly? Probably also improve guest's performance to access host's nvme device. And I assume LIO NVMe target will be available in the near future. Thanks. -- To unsubscribe from this list: send the line "unsubscribe target-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
