Re: [Xen-devel] booting from HVM (?pv?)

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Jun 25, 2013 at 07:21:48PM +0200, AL13N wrote:
> Op dinsdag 25 juni 2013 18:39:06 schreef Pasi Kärkkäinen:
> > On Mon, Jun 24, 2013 at 10:21:48PM +0200, AL13N wrote:
> > > Hi,
> > > 
> > > I'm the Mageia XEN packager and during QA, we stumbled into a problem.
> > > 
> > > in fact, we wanted to test Mageia 3 installation on a HVM.
> > > 
> > > so, we had a sparse image and a iso file:
> > > 
> > > [ 'file:/opt/testhvm.img,sda,w', 'file:/opt/mageialive.iso,hdb:cdrom,r' ]
> > > 
> > > the live booted, and was able to install to disk, but it never seemed to
> > > boot after the install... (for some reason)
> > > 
> > > in the end, this "worked" when we changed to:
> > > 
> > > [ 'file:/opt/testhvm.img,xvda,w', 'file:/opt/testhvm.img,sda,w' ]
> > > 
> > > apparently 'xvda' to get grub to boot the kernel; and 'sda' so that it
> > > could start...
> > > 
> > > 
> > > any idea as to why it can't be booted with sda? is there a specific driver
> > > missing?
> > 
> > See here for more info:
> > http://wiki.xen.org/wiki/Xen_Linux_PV_on_HVM_drivers
> > 
> > This config works for both HVM and PVHVM:
> > disk = [ 'phy:/dev/vg01/f16pvhvm-disk0,hda,w',
> > 'file:/root/iso/Fedora-16-x86_64-DVD.iso,hdc:cdrom,r' ]
> > 
> > You can enable or disable PV drivers with:
> > xen_platform_pci=0|1
> 
> i'm assuming that hda (ide_generic) would be using regular emulation? and the 
> pv driver (xenblk_front) could be hda, sda, or xvda and it will choose the 
> one 
> you've chosen in the config? (via xen_platform_pci)?
>

Yeah, if xen_platform_pci=0 then hda will be emulated, and if 
xen_platform_pci=1 then
xen-blkfront will start and "unplug" the emulated hda, so there's only xvda.

-- Pasi


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