Re: [Xen-devel] Xen 4.x / Linux 3.x (dom0 and HVM domU) and NIC handling

[Alex Bligh <alex@xxxxxxxxxxx>]

--On 2 December 2011 16:40:48 +0000 Ian Campbell <Ian.Campbell@xxxxxxxxxx> 
wrote:
> > AFAIK changing xen_platform_pci=0|1 will switch rather more than just
> > the NIC. It will switch your disk too, instantly causing your previously
> > happily booting OS to fail to boot as the root device name changes.
> We recommend you use "root=LABEL=foo" rather than "root=/dev/blah" for
> this reason. Fortunately most distros use that scheme by default these
> days.
Yes; and /etc/fstab. UUID= works too.

FWIW my experience is that various built-for-cloud type distros don't use
that scheme, mainly because they use grub1 which IIRC does not support
this, and building images in a non-root environment that have grub1
in is rather easier than grub2. So, for instance, all the vm-builder
stuff in debian/ubuntu used grub1 and did not work this way.

However, my point was that xen_platform_pci does not only change
whether your net driver is emulated or PVHVM, but also whether your
disk, and indeed everything else is emulated or PVHVM.

--
Alex Bligh

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