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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Dec 02, 2011 at 04:40:48PM +0000, Ian Campbell wrote:
> On Fri, 2011-12-02 at 16:36 +0000, Alex Bligh wrote:
> > 
> > --On 2 December 2011 12:41:10 +0200 Pasi Kärkkäinen <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.
> 

Yep, for example Fedora works out-of-the-box with both HVM and PVHVM..

-- Pasi


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