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Subject: Re: [virtio-comment] About adding a new device type virtio-nvme
On Wed, Jan 11, 2023 at 11:21:35AM +0800, äèä wrote: > As we know, nvme has more features than virtio-blk. For example, with the development of virtualization IO offloading to hardware, virtio-blk and NVME-OF offloading to hardware are developing rapidly. So if virtio and nvme are combined into Virtio-NvMe, Is it necessary to add a device type Virtio-NvMe ? Hi, In theory, yes, virtio-nvme can be done. The question is why do it? NVMe already provides a PCI hardware spec for software and hardware implementations to follow. An NVMe PCI device can be exposed to the guest and modern operating systems recognize it without requiring new drivers. The value of VIRTIO here is probably in the deep integration into the virtualization stack with vDPA, vhost, etc. A virtio-nvme device can use all these things whereas a PCI device needs to do everything from scratch. Let's not forget that virtio-blk is widely used and new commands are being added as needed. Which NVMe features are you missing in virtio-blk? I guess this is why virtio-nvme hasn't been done before: people who want NVMe can already do NVMe PCI, people who want VIRTIO can use virtio-blk, and so there hasn't been a great need to combine VIRTIO and NVMe yet. What advantages do you see in having virtio-nvme? Stefan
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