Re: [Qemu-devel] Question about xen disk unplug support for ahci missed in qemu

[John Snow <jsnow@redhat.com>]

On 10/13/2015 11:55 AM, Fabio Fantoni wrote:
> I added ahci disk support in libxl and using it for week seems that was
> ok, after a reply of Stefano Stabellini seems that xen disk unplug
> support only ide disks:
> http://git.qemu.org/?p=qemu.git;a=commitdiff;h=679f4f8b178e7c66fbc2f39c905374ee8663d5d8
> 
> Today Paul Durrant told me that even if pv disk is ok also with ahci and
> the emulated one is offline can be a risk:
> http://lists.xenproject.org/archives/html/win-pv-devel/2015-10/msg00021.html
> 
> 
> I tried to take a fast look in qemu code but I not understand the needed
> thing for add the xen disk unplug support also for ahci, can someone do
> it or tell me useful information for do it please?
> 
> Thanks for any reply and sorry for my bad english.
> 

I'm not entirely sure what features you need AHCI to support in order
for Xen to be happy.

I'd guess hotplugging, but where I get confused is that IDE disks don't
support hotplugging either, so I guess I'm not sure sure what you need.

Stefano, can you help bridge my Xen knowledge gap?

--js