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

["AL13N" <alien@xxxxxxxx>]

> On Mon, Jun 24, 2013 at 9:21 PM, AL13N <alien@xxxxxxxx> 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...
>
> My HVM Linux config files have 'hda' instead of 'sda' -- can you try
> that instead?
>
> Normally what happens is that qemu begins by exposing the hda device
> to the guest, to boot via grub; but when the Xen PV drivers in the
> Linux kernel come up, they write to a magic port which causes the
> physical hda device to disappear.  I *think* then that the Xen PV
> drivers actually take over that major/minor, so that further reads and
> writes to the hda go through the PV protocol instead.
>
> All of this might get mixed up if you're using sda instead.
>
>  -George
>


well, hda is what we tried first, but we couldn't see the disk from the
live system with hda. only sda seemed to work for that...


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