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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2011-12-02 at 16:36 +0000, Alex Bligh wrote:
> 
> --On 2 December 2011 12:41:10 +0200 Pasi KÃrkkÃinen <pasik@xxxxxx> wrote:
> 
> >> And then, ok this is probably a quite naive approach, it seemed to make
> >> sense to go through the pain of always having potentially both
> >> interfaces available (emulated and pv) so in theory the same guest
> >> config can accommodate a guest os supporting one or the other (or easily
> >> switch from one to the other). Otherwise I would expect an emulated
> >> device only when I have hd? in the config and a pv device when I write
> >> xvd?.
> >>
> >
> > This works for both HVM and PVHVM (also mentioned on the wiki page):
> > vif = [ 'mac=00:16:5e:02:07:45, bridge=xenbr0, model=e1000' ]
> >
> > So there's no need for "type=ioemu" option with xm/xend.
> >
> > You can switch between HVM and PVHVM with:
> > xen_platform_pci=0|1
> 
> 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.

Ian.



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