[SPDK] Re: The difference between vhost-nvme and vhost-blk

> -----Original Message-----
> From: zbhhbz <zbhhbz(a)yeah.net>
> Sent: 08 March 2022 09:29
> To: spdk <spdk(a)lists.01.org>
> Subject: [SPDK] Re: The difference between vhost-nvme and vhost-blk
> 
> thanks, follow up questions:
> 1. if I still use Vhost-user-blk-pci in qemu and with nvme ssd(bdev), i cant'
> have access to the nvme feature in guest(shadow door bell). is that correct?

Correct.

> 2. in the vfio-user solution, does the interrupt sending from the ssd(nvme)
> go through the qemu/kvm? or it go straight to the guest kernel?

It doesn't go to QEMU/KVM. It depends on how you've set it up in SPDK: it can either go the host kernel or to SPDK.

> 3. when will the vfio-user be available? does kvm have same delima here?

vfio-user is under review in QEMU, so we can't predict when it will be accepted upstream. This doesn't mean you can't use it though, have a look here: https://github.com/nutanix/libvfio-user/blob/master/docs/spdk.md

> 
> 
> thank you very much!
> 
> 
> 
> 
> ---- 回复的原邮件 ----
> | 发件人 | Liu, Changpeng<changpeng.liu(a)intel.com> |
> | 日期 | 2022年03月08日 16:33 |
> | 收件人 | Storage Performance Development Kit<spdk(a)lists.01.org> |
> | 抄送至 | |
> | 主题 | [SPDK] Re: The difference between vhost-nvme and vhost-blk |
> Previously SPDK extended QEMU with a separate driver to enable vhost-
> nvme, this driver
> was not accepted by QEMU, so now we support emulated NVMe with a new
> solution
> "vfio-user", again the driver for supporting this is still under code review of
> QEMU community,
> but SPDK already supports this.
> 
> > -----Original Message-----
> > From: zbhhbz(a)yeah.net <zbhhbz(a)yeah.net>
> > Sent: Tuesday, March 8, 2022 4:29 PM
> > To: spdk(a)lists.01.org
> > Subject: [SPDK] The difference between vhost-nvme and vhost-blk
> >
> > Could someone help me understand the difference between vhost-nvme
> and
> > vhost-blk?
> > The online doc only shows there is vhost-user-blk-pci, why not vhost-user-
> nvme-
> > pci?
> > There is little doc fined in github/spdk and the qemu itself doesn't help
> either
> > Thanks!
> > _______________________________________________
> > SPDK mailing list -- spdk(a)lists.01.org
> > To unsubscribe send an email to spdk-leave(a)lists.01.org
> _______________________________________________
> SPDK mailing list -- spdk(a)lists.01.org
> To unsubscribe send an email to spdk-leave(a)lists.01.org
> _______________________________________________
> SPDK mailing list -- spdk(a)lists.01.org
> To unsubscribe send an email to spdk-leave(a)lists.01.org