Re: [Xen-devel] [PATCH qemu-xen-traditional 1/2] xen_platform: unplug also SCSI disks [and 1 more messages]

[Olaf Hering <olaf@xxxxxxxxx>]

On Mon, Jan 09, Ian Jackson wrote:

> Olaf Hering writes ("[PATCH qemu-xen-traditional 2/2] xen_platform: SUSE 
> xenlinux unplug for emulated PCI"):
> > From: Olaf Hering <ohering@xxxxxxx>
> > 
> > Implement SUSE specific unplug protocol for emulated PCI devices
> > in PVonHVM guests. Its a simple 'outl(1, (ioaddr + 4));'.
> > This protocol was implemented and used since Xen 3.0.4.
> > It is used in all SUSE/SLES/openSUSE releases up to SLES11SP3 and
> > openSUSE 12.3.
> > In addition old (pre-2011) VMDP versions are handled as well.
> 
> On the other hand, I am very reluctant to apply this.
> 
> I don't see a good reason for SUSE to have a custom unplug protocol.
> Why can't your guests use the standard one ?  Why haven't they been
> updated to use the standard one some time in the last ?5-10 years ?

The protocol was introduced before upstream had one, xen-3.0 vs.
xen-3.x. I have not digged into 10 year old emails why it was done that
way, if it was ever proposed for upstream inclusion. Meanwhile the
upstream unplug is used since a two years. This patch would allow to run
old SUSE domUs on new non-SUSE dom0s with qemu-trad.

Olaf

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