[Xen-devel] Re: 2.6.37 PV on HVM and emul_unplug=unnecessary

[Alex Bligh <alex@xxxxxxxxxxx>]

--On 12 January 2011 14:04:57 +0100 Paolo Bonzini <pbonzini@xxxxxxxxxx> 
wrote:
> Something similar was done in the 2.6.18 "XenoLinux" kernels, but it's
> ugly and it touches into areas of the kernell that Xen support shouldn't
> affect.
>
> If your "Xen Dom0 prior to 3.4.something" is RHEL/CentOS, the 5.6 version
> will include a backport of PCI unplug support.  Then you only need to bug
> your cloud provider. :)
I am the cloud provider. The real fix is to move to Xen 4.0.1. Part of
the issue, however, is moving to 4.0.1 will make a subset of guests
behave differently from others, as suddenly their /dev/sda will disappear.
We know there are people who don't use standard installs so possibly
unknowingly are not using pv drivers (e.g. they have /dev/sdaX in their
fstab). It would be nice if I could separate this change from the rest
of the 4.0.1 upgrade, as this would make a 4.0.1 upgrade less scary.
It would be oh-so-much-easier-for-me if /dev/sdaX disappeared when
they upgraded their kernel, rather than when I make a later change.

However, if could point me at a working changeset which contains the
backport, that would be really useful. Stefano posted one which I
think he marked as "untested".

--
Alex Bligh

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