On Mon, Apr 25, 2011 at 11:15:45AM +0800, topperxin wrote:
> Thank you, Stefano
> I have known that the first linux kernel version which include the
> PVONHVM feature is 2.6.36. But now, the question I have to face is our
> clients always required us to support other linux version, which not
> 2.6.36, perhaps 2.6.35,
> 2.6.34, 2.6.32... so I have to porting the PV drivers to these kernel
> version.
> At first, if the target kernel version is
> 2.6.2X, I ported the pv-drivers based on 2.6.18,
> these work not very hard, and I successfully. such ubuntu 8.04(2.6.24),
> debian5.05(2.6.26)
> But, if the target kernel version is 2.6.3X, these work seems very
> difficult, I couldn't complete it, the biggest trouble is can't debug the
> xen-blkfront.
Novell SLES/OpenSuse has a forward-port of the 2.6.18 based PVHVM drivers
to 2.6.2x and 2.6.3x.
But I think it's better to use the new upstream-included PVHVM drivers these
days.
-- Pasi
> Since I known that the pv-drivers will be included in linux kernel
> 2.6.36, I studied the changes of it, and I try to port them to
> ubuntu10.10(2.6.35), based on 2.6.36, the result is system can boot
> successfully with xen-blkfront
> disk, but when I execute some commands such as:
> ls, mkdir...
> the system will be blocked, the phenomena just like before I have stated
> in this mail.
> What should I do next? Is this method ok?
> Could you please tell me, when you write the xen-blkfront disk drivers for
> linux kernel 2.6.36, how do you debug it when you meet errors?
> Thank you very much.
>
>
> At 2011-04-21 01:24:25£¬"Stefano Stabellini"
> <stefano.stabellini@xxxxxxxxxxxxx> wrote:
>
> >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.
>
> --------------------------------------------------------------------------
>
> [1]ÌåÑéÍøÒ×ÓÊÏä2G³¬ŽóžœŒþ£¬ÇáËÉ·¢ÓÅÖÊŽóµçÓ°¡¢ŽóÕÕƬ£¬ÌáËÙ3±¶!
>
> References
>
> Visible links
> 1. http://mail.163.com/html/110414_attachment/att1.htm
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