On Tue, 19 Apr 2011, topperxin wrote:
> hi Stefano
> thanks for your time
> As your method, I modified my /boo/grub/grub.cfg of ubuntu10.10 like this:
> ====================================================
> menuentry 'Ubuntu, with Linux 2.6.35.4.pvonhvm' --class ubuntu --class
> gnu-linux --class gnu --class os {
> recordfail
> insmod part_msdos
> insmod ext2
> set root='(hd0,msdos1)'
> search --no-floppy --fs-uuid --set
> 3336889c-576e-4088-a6ff-89e869289766
> linux /boot/vmlinuz-2.6.35.4
> root=UUID=3336889c-576e-4088-a6ff-89e869289766 ro
> xen_emul_unplug=aux-ide-disks
> initrd /boot/initrd.img-2.6.35.4.pvonhvm.0415
> }
> =======================================================
>
> then I reboot the Guest OS , I found the boot disk is still the xen-blkfront,
> not the qemu emulate.
aux-ide-disks means "do not unplug secondary emulated disks".
> I reviewed the source of ./arch/x86/xen/platform-pci-unplug.c. there are
> several parameters, such as:
>
> ===================================================================
> if (!strncmp(p, "all", l))
> xen_emul_unplug |= XEN_UNPLUG_ALL;
> else if (!strncmp(p, "ide-disks", l))
> xen_emul_unplug |= XEN_UNPLUG_ALL_IDE_DISKS;
> else if (!strncmp(p, "aux-ide-disks", l))
> xen_emul_unplug |= XEN_UNPLUG_AUX_IDE_DISKS;
> else if (!strncmp(p, "nics", l))
> xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
> else if (!strncmp(p, "unnecessary", l))
> xen_emul_unplug |= XEN_UNPLUG_UNNECESSARY;
> else if (!strncmp(p, "never", l))
> xen_emul_unplug |= XEN_UNPLUG_NEVER;
> =========================================================
> In my opinion , If I want to use the emulated disk , I should set
>
> xen_emul_unplug = XEN_UNPLUG_UNNECESSARY or
>
> xen_emul_unplug = XEN_NEVER
>
> right? I try these two ways, but I still failed.
If you specify xen_emul_unplug=XEN_UNPLUG_UNNECESSARY you prevent
blkfront from hooking PV disks corresponding to emulated disks.
Of course you have to make sure your root device is not /dev/xvda
because that wouldn't work anymore, try root=/dev/sda if you want to
make sure that you are using the emulated path.
Also you need to specify hd* devices in your disk line in the VM config
file, like this:
disk = [ 'file:/root/images/debian_lenny_i386_small.raw,hda,w']
>
> Could you please tell me where can I get the source of
>
> kernel 2.6.35 with pvonhvm???
The first Linux kernel to have PV on HVM support was Linux 2.6.36, so I
don't have any 2.6.35 Linux tree with PV on HVM support. However a
vanilla 2.6.36 (or 2.6.37 or 2.6.38) kernel should just work as PV on
HVM kernel._______________________________________________
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