I tried these configs. The same result - it does not find root device.
However, if I disable 'CONFIG_XEN_PLATFORM_PCI', everything works. I can see my
disk as /dev/sda.
If CONFIG_XEN_PLATFORM_PCI is enabled (by default), virtual ATA device appears,
I can see GRUB, load the kernel. But when kernel tries to mount root device, it
cannot find it. There is no /dev/xvda*, no /dev/hda*, no /dev/sda*, nothing!
Apparently, it's a problem with actual kernel disk driver (not configuration).
I get the same result also if I specify physical device.
Also, I noted weird messages in dom0:
XENBUS: Unable to read cpu state
P.S. For HVM domain I use Ubuntu 9.04
Thanks,
Ruslan.
--- On Thu, 8/5/10, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> wrote:
> From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> Subject: Re: [Xen-devel] HVM hypercalls
> To: "Ruslan Nikolaev" <nruslan_devel@xxxxxxxxx>
> Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Jeremy
> Fitzhardinge" <jeremy@xxxxxxxx>
> Date: Thursday, August 5, 2010, 2:31 PM
> On Wed, 4 Aug 2010, Ruslan Nikolaev
> wrote:
> > Yes, I tried this but it does not seem to work. BTW in
> paravirtualized mode it works fine, the problem is only with
> HVM.
> >
> > I tried to specify root=/dev/xvda (my disk image has
> no partitions, entire disk image is a single file system).
> >
>
> If your disk file represents a single partition and in your
> pv config file you
> have a disk entry like this one:
>
> disk = [ 'file:/home/ruslan/fs1.img,xvda1,w' ]
>
> then your disk is not going to work in HVM mode.
> Qemu must be able to handle your disk otherwise the
> bootloader won't be
> able to boot your kernel.
>
>
> > My config is (I also tried to comment out device model
> but it does not help):
> >
> > import os, re
> > arch = os.uname()[4]
> > if re.search('64', arch):
> > arch_libdir = 'lib64'
> > else:
> > arch_libdir = 'lib'
> >
>
> remove this part if you are using xl
>
> > kernel = "/usr/lib/xen/boot/hvmloader"
> >
> > builder='hvm'
> >
> > vcpus=1
> >
> > memory = 1024
> > shadow_memory = 8
> > name = "xenhvm1"
> > disk = [ 'file:/home/ruslan/fs1.img,xvda,w' ]
>
> Even though xvda is currently supported it would be better
> to specify
> hda here if you only have one disk, because you need at
> least an IDE
> interface to boot.
>
> > device_model = '/usr/' + arch_libdir +
> '/xen/bin/qemu-dm'
>
> device_model='qemu-dm' especially if you are using xl
>
>
>
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