From: Olaf Hering <olaf@aepfle.de>
To: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: xen-devel@lists.xenproject.org
Subject: Re: [PATCH qemu-xen-traditional 1/2] xen_platform: unplug also SCSI disks [and 1 more messages]
Date: Mon, 9 Jan 2017 17:39:07 +0100 [thread overview]
Message-ID: <20170109163907.GA14471@aepfle.de> (raw)
In-Reply-To: <22643.40798.969287.384827@mariner.uk.xensource.com>
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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@suse.de>
> >
> > 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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next prev parent reply other threads:[~2017-01-09 16:39 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-24 20:11 [PATCH qemu-xen-traditional 0/2] Xen HVM unplug changes Olaf Hering
2016-11-24 20:11 ` [PATCH qemu-xen-traditional 1/2] xen_platform: unplug also SCSI disks Olaf Hering
2016-11-24 20:11 ` [PATCH qemu-xen-traditional 2/2] xen_platform: SUSE xenlinux unplug for emulated PCI Olaf Hering
2017-01-09 14:34 ` [PATCH qemu-xen-traditional 1/2] xen_platform: unplug also SCSI disks [and 1 more messages] Ian Jackson
2017-01-09 16:39 ` Olaf Hering [this message]
2017-01-10 10:34 ` George Dunlap
2017-01-31 17:14 ` Olaf Hering
2017-01-31 17:32 ` Ian Jackson
2017-01-31 17:44 ` Olaf Hering
2017-01-09 11:23 ` [PATCH qemu-xen-traditional 0/2] Xen HVM unplug changes Olaf Hering
2017-01-09 14:26 ` Ian Jackson
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