Mailing List Archive

On Wed, Apr 13, 2011 at 10:46:10AM +0800, topperxin wrote:
> hi all,
> I have just ported the pvovhvm drivers to ubuntu 10.10 ,the domU can boot successfully, but when the domU running, intermittence， the system will give me such warnings:
> INFO: task login:1073 blocked for more than 120 seconds.
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> INFO: task flush-202:0:457 blocked for more than 120seconds.
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> INFO: task jbd2/sda1-8:422 blocked for more than 120 seconds.
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>
> what's wrong with the domU? is it means there are some errors in
> xen-blkfront? how should I debug this error???

Enable the verbose output (DPRINTK) and see what the data stream has. What kernel
version is 10.10?


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thanks for your time
the version of ubuntu 10.10 is 2.6.35.


the domU can boot successfully, but when I operate some commands such
as :ls ,touch , it'll be blocked, just like I stated before.


I have another question:
when I debug the xen-blkfront, I found the most difficult thing
is debug it. I want to know can I use xen-blkfront substitute a slave
disk, not the boot disk(primary disk), thus I can boot the system on qemu emulated disk, and then mount the xen-blkfront disk, then to debug it. Can I do this???
waiting...




At 2011-04-14 20:56:31£¬"Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com> wrote:

>On Wed, Apr 13, 2011 at 10:46:10AM +0800, topperxin wrote:
>> hi all,
>> I have just ported the pvovhvm drivers to ubuntu 10.10 ,the domU can boot successfully, but when the domU running, intermittence£¬ the system will give me such warnings:
>> INFO: task login:1073 blocked for more than 120 seconds.
>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>> INFO: task flush-202:0:457 blocked for more than 120seconds.
>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>> INFO: task jbd2/sda1-8:422 blocked for more than 120 seconds.
>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>
>> what's wrong with the domU? is it means there are some errors in
>> xen-blkfront? how should I debug this error???
>
>Enable the verbose output (DPRINTK) and see what the data stream has. What kernel
>version is 10.10?
>
>
>_______________________________________________
>Xen-devel mailing list
>Xen-devel@lists.xensource.com
>http://lists.xensource.com/xen-devel

On Mon, 18 Apr 2011, topperxin wrote:
> thanks for your timethe version of ubuntu 10.10 is 2.6.35.
>
> the domU can boot successfully, but when I operate some commands such 
> as :ls ,touch , it'll be blocked, just like I stated before.
>
> I have another question:
>       when I debug the xen-blkfront, I found the most difficult thing 
> is debug it. I want to know can I use xen-blkfront substitute a slave 
> disk, not the boot disk(primary disk), thus I can boot the system on qemu emulated disk, and then mount the xen-blkfront
> disk, then to debug it. Can I do this???
>       waiting...

You can add xen_emul_unplug=aux-ide-disks to the linux command line
options, so that the kernel will not unplug the emulated primary disk.
Then you can use root=/dev/hda to make sure that the kernel uses the
emulated interface to access the primary disk.
Afterwards you should be able to debug blkfront accessing the secondary
disk that should appear as /dev/xvdb for example.

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.
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.


Could you please tell me where can I get the source of


kernel 2.6.35 with pvonhvm???


Thank you very much.



















At 2011-04-18 22:05:43£¬"Stefano Stabellini" <stefano.stabellini@eu.citrix.com> wrote:

>On Mon, 18 Apr 2011, topperxin wrote:
>> thanks for your timethe version of ubuntu 10.10 is 2.6.35.
>>
>> the domU can boot successfully, but when I operate some commands such
>> as :ls ,touch , it'll be blocked, just like I stated before.
>>
>> I have another question:
>> when I debug the xen-blkfront, I found the most difficult thing
>> is debug it. I want to know can I use xen-blkfront substitute a slave
>> disk, not the boot disk(primary disk), thus I can boot the system on qemu emulated disk, and then mount the xen-blkfront
>> disk, then to debug it. Can I do this???
>> waiting...
>
>You can add xen_emul_unplug=aux-ide-disks to the linux command line
>options, so that the kernel will not unplug the emulated primary disk.
>Then you can use root=/dev/hda to make sure that the kernel uses the
>emulated interface to access the primary disk.
>Afterwards you should be able to debug blkfront accessing the secondary
>disk that should appear as /dev/xvdb for example.
>

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.

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.
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@eu.citrix.com> 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.

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@eu.citrix.com> 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

> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel


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http://lists.xensource.com/xen-devel

On Mon, 25 Apr 2011, 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.
>       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?

I don't have a silver bullet, just add more printk's until you
understand what is going on :-)