Re: [Xen-devel] [PATCH RESEND] tools/libxl: add support for emulated NVMe drives

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, Jan 19, 2017 at 08:58:12AM +0000, Paul Durrant wrote:
> > -----Original Message-----
> [snip]
> > > > For safety I guess I could explore the possibility of having libxl not
> > > > create a PV backend for this vdev type.
> > >
> > > ... this is the best option for now.
> > >
> > 
> > And I realise if we are not going to have code in libxl for nvme pv
> > disk, we can just use device_model_args to add the emulated device,
> > which means this patch is not needed anymore.
> > 
> 
> device_model_args is not exactly a user-friendly way to use emulated nvme 
> disks, which was the main motivation for this patch.
> 
> > Can you clarify the use case you anticipated for emulated NVMe disks?
> > 
> 
> My personal use is going to be to test performance, and maybe try to improve. 
> The advantage with NVMe over PV is that the perf. is already not bad, and 
> there's no need to install PV storage drivers since recent versions of 
> Windows (and other OS) already have NVME drivers. The main problem with them 
> is that seabios cannot (yet) boot from NVMe. I'm hoping OVMF might, but I 
> need to experiment further.
> Given the push-back I guess I'll live with the device_model_args hassle for 
> the moment and re-send once I've got an unplug patch into QEMU.
> 

Thanks for clarification. It's best to resubmit until QEMU patch is
ready.

Wei.

>   Paul

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