GRUB and support for Virtio

GRUB and support for Virtio

[Daniel Bareiro]

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Hi all!

I'm doing some tests in a KVM virtual machine with CentOS 5.5 and it
seems that GRUB is not recognizing the Virtio devices:

# ll /dev/vd*
brw-r----- 1 root disk 253,  0 ago 17 23:35 /dev/vda
brw-r----- 1 root disk 253,  1 ago 17 23:35 /dev/vda1
brw-r----- 1 root disk 253,  2 ago 17 23:35 /dev/vda2
brw-r----- 1 root disk 253, 16 ago 18 00:27 /dev/vdb
brw-r----- 1 root disk 253, 17 ago 18 00:32 /dev/vdb1
brw-r----- 1 root disk 253, 18 ago 18 00:32 /dev/vdb2

-----------------------------------------------------------------------
# grub
Probing devices to guess BIOS drives. This may take a long time.


    GNU GRUB  version 0.97  (640K lower / 3072K upper memory)

 [ Minimal BASH-like line editing is supported.  For the first word, TAB
   lists possible command completions.  Anywhere else TAB lists the possible
   completions of a device/filename.]
grub> root (hd0,0)
root (hd0,0)

Error 21: Selected disk does not exist


grub> root (hd1,0)
root (hd1,0)

Error 21: Selected disk does not exist
-----------------------------------------------------------------------

Is there any way to solve this problem?


Thanks in advance for your replies.

Regards,
Daniel
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Re: GRUB and support for Virtio

[Martin Kraus]

On Wed, Aug 18, 2010 at 01:54:22AM -0300, Daniel Bareiro wrote:
> I'm doing some tests in a KVM virtual machine with CentOS 5.5 and it
> seems that GRUB is not recognizing the Virtio devices:
> 
> # ll /dev/vd*
> brw-r----- 1 root disk 253,  0 ago 17 23:35 /dev/vda
> brw-r----- 1 root disk 253,  1 ago 17 23:35 /dev/vda1
> brw-r----- 1 root disk 253,  2 ago 17 23:35 /dev/vda2
> brw-r----- 1 root disk 253, 16 ago 18 00:27 /dev/vdb
> brw-r----- 1 root disk 253, 17 ago 18 00:32 /dev/vdb1
> brw-r----- 1 root disk 253, 18 ago 18 00:32 /dev/vdb2

I've never had any problems with installing grub on virtio. what is in your
/boot/grub/device.map?

mk

Re: GRUB and support for Virtio

[Daniel Bareiro]

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Hi, Martin.

On Wednesday, 18 August 2010 14:49:57 +0200,
Martin Kraus wrote:

> > I'm doing some tests in a KVM virtual machine with CentOS 5.5 and it
> > seems that GRUB is not recognizing the Virtio devices:
> > 
> > # ll /dev/vd*
> > brw-r----- 1 root disk 253,  0 ago 17 23:35 /dev/vda
> > brw-r----- 1 root disk 253,  1 ago 17 23:35 /dev/vda1
> > brw-r----- 1 root disk 253,  2 ago 17 23:35 /dev/vda2
> > brw-r----- 1 root disk 253, 16 ago 18 00:27 /dev/vdb
> > brw-r----- 1 root disk 253, 17 ago 18 00:32 /dev/vdb1
> > brw-r----- 1 root disk 253, 18 ago 18 00:32 /dev/vdb2

> I've never had any problems with installing grub on virtio. what is in
> your /boot/grub/device.map?

# cat /boot/grub/device.map
# this device map was generated by anaconda
(hd0)     /dev/vda


In Debian I had no problems, but in CentOS 5.5 I came across this when I
was doing some tests to convert an existing installation in another with
RAID-1.

Thanks for your reply.

Regards,
Daniel
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Re: GRUB and support for Virtio

[lists]

make sure your device.map has correct maps (yours look good) then run 
grub as follows:

grub --device-map=/boot/grub/device.map

I migrated all my centos 5.5 vms to virtio like that, and it worked 
fine. And yes something is not correct with grub and virtio detection on 
centos, it works on fedora.

fil

On 08/18/2010 09:30 AM, Daniel Bareiro wrote:
> Hi, Martin.
>
> On Wednesday, 18 August 2010 14:49:57 +0200,
> Martin Kraus wrote:
>
>>> I'm doing some tests in a KVM virtual machine with CentOS 5.5 and it
>>> seems that GRUB is not recognizing the Virtio devices:
>>>
>>> # ll /dev/vd*
>>> brw-r----- 1 root disk 253,  0 ago 17 23:35 /dev/vda
>>> brw-r----- 1 root disk 253,  1 ago 17 23:35 /dev/vda1
>>> brw-r----- 1 root disk 253,  2 ago 17 23:35 /dev/vda2
>>> brw-r----- 1 root disk 253, 16 ago 18 00:27 /dev/vdb
>>> brw-r----- 1 root disk 253, 17 ago 18 00:32 /dev/vdb1
>>> brw-r----- 1 root disk 253, 18 ago 18 00:32 /dev/vdb2
>
>> I've never had any problems with installing grub on virtio. what is in
>> your /boot/grub/device.map?
>
> # cat /boot/grub/device.map
> # this device map was generated by anaconda
> (hd0)     /dev/vda
>
>
> In Debian I had no problems, but in CentOS 5.5 I came across this when I
> was doing some tests to convert an existing installation in another with
> RAID-1.
>
> Thanks for your reply.
>
> Regards,
> Daniel

Re: GRUB and support for Virtio

[Nikolai K. Bochev]

Strange, i did 2 clean installs of centos 5.5 on an ubuntu 9.10 host and it went flawless with virtio devices ( both disks and network ).

----- Original Message -----
> make sure your device.map has correct maps (yours look good) then run
> grub as follows:
> 
> grub --device-map=/boot/grub/device.map
> 
> I migrated all my centos 5.5 vms to virtio like that, and it worked
> fine. And yes something is not correct with grub and virtio detection
> on
> centos, it works on fedora.
> 
> fil

-- 


Nikolai K. Bochev 
System Administrator 

Re: GRUB and support for Virtio

[Daniel Bareiro]

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On Wednesday, 18 August 2010 21:45:56 +0300,
Nikolai K. Bochev wrote:

> Strange, i did 2 clean installs of centos 5.5 on an ubuntu 9.10 host
> and it went flawless with virtio devices ( both disks and network ).

It appears that Debian have the same problem. In the installation of
both Debian Lenny and CentOS 5.5, I had no problems, but appear later
using 'setup' and 'root':

-----------------------------------------------------------------------
debian-test8:~# fdisk -l /dev/vda

Disco /dev/vda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cilindros of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000b7998

Disposit. Inicio    Comienzo      Fin      Bloques  Id  Sistema
/dev/vda1               1         122      979933+  82  Linux swap / Solaris
/dev/vda2             123        1305     9502447+  83  Linux
debian-test8:~#
debian-test8:~#
debian-test8:~# grub
Probing devices to guess BIOS drives. This may take a long time.


    GNU GRUB  version 0.97  (640K lower / 3072K upper memory)

       [ Minimal BASH-like line editing is supported.   For
         the   first   word,  TAB  lists  possible  command
         completions.  Anywhere else TAB lists the possible
         completions of a device/filename. ]
grub> root (hd0,1)
root (hd0,1)

Error 21: Selected disk does not exist
grub>

grub> setup (hd0)

Error 12: Invalid device requested
-----------------------------------------------------------------------

But invoking GRUB with this file, it does recognize the disk:

-----------------------------------------------------------------------
debian-test8:~# cat /boot/grub/device.map
(hd0)   /dev/vda

debian-test8:~# grub --device-map=/boot/grub/device.map


    GNU GRUB  version 0.97  (640K lower / 3072K upper memory)

       [ Minimal BASH-like line editing is supported.   For
         the   first   word,  TAB  lists  possible  command
         completions.  Anywhere else TAB lists the possible
         completions of a device/filename. ]
grub> root (hd0,1)
root (hd0,1)
 Filesystem type is ext2fs, partition type 0x83
grub> setup (hd0)
setup (hd0)
 Checking if "/boot/grub/stage1" exists... yes
 Checking if "/boot/grub/stage2" exists... yes
 Checking if "/boot/grub/e2fs_stage1_5" exists... yes
 Running "embed /boot/grub/e2fs_stage1_5 (hd0)"...  17 sectors are embedded.
succeeded
 Running "install /boot/grub/stage1 (hd0) (hd0)1+17 p (hd0,1)/boot/grub/stage2
/boot/grub/menu.lst"... succeeded
Done.
-----------------------------------------------------------------------

However, in installations made on IDE disks, it is not necessary to do
this. What could be causing this difference?


Thanks for your replies.

Regards,
Daniel
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Re: GRUB and support for Virtio

[Daniel Bareiro]

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On Wednesday, 18 August 2010 21:45:56 +0300,
Nikolai K. Bochev wrote:

> Strange, i did 2 clean installs of centos 5.5 on an ubuntu 9.10 host
> and it went flawless with virtio devices ( both disks and network ).

Doing some tests with CentOS 5.5 on a KVM virtual machine, after doing
the installation, I added a second disk. But when trying to boot from
it, I get the following error:

---------------------------------------------------------------------
root (hd1,0)

Error 21: Selected disk does not exist
---------------------------------------------------------------------


The two disks are Virtio devices that are recognized when booting from
the first disk:

---------------------------------------------------------------------
[root@localhost ~]# fdisk -l /dev/vda

Disco /dev/vda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Unidades = cilindros de 16065 * 512 = 8225280 bytes

Disposit. Inicio    Comienzo      Fin      Bloques  Id  Sistema
/dev/vda1   *           1        1174     9430123+  fd  Linux raid autodetect
/dev/vda2            1175        1305     1052257+  fd  Linux raid autodetect
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# fdisk -l /dev/vdb

Disco /dev/vdb: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Unidades = cilindros de 16065 * 512 = 8225280 bytes

Disposit. Inicio    Comienzo      Fin      Bloques  Id  Sistema
/dev/vdb1   *           1        1174     9430123+  fd  Linux raid autodetect
/dev/vdb2            1175        1305     1052257+  fd  Linux raid autodetect
---------------------------------------------------------------------

The idea of these tests is to set up software RAID1 on a running system,
since, it seems that Anaconda does not support installation on degraded
RAID.

But I'm not sure if this is a problem of Virtio or that GRUB is not
recognizing the second disk.

I made sure to modify /boot/grub/device.map with the entry for the new
disk:

---------------------------------------------------------------------
[root@localhost grub]# cat /boot/grub/device.map
# this device map was generated by anaconda
(hd0)     /dev/vda
(hd1)     /dev/vdb
---------------------------------------------------------------------

And the reconfiguration of GRUB on both disks did not give problems:

---------------------------------------------------------------------
[root@localhost grub]# grub --device-map=/boot/grub/device.map


    GNU GRUB  version 0.97  (640K lower / 3072K upper memory)

 [ Minimal BASH-like line editing is supported.  For the first word, TAB
   lists possible command completions.  Anywhere else TAB lists the
possible
   completions of a device/filename.]
grub> root (hd0,0)
root (hd0,0)
 Filesystem type is ext2fs, partition type 0xfd
grub> setup (hd0)
setup (hd0)
 Checking if "/boot/grub/stage1" exists... yes
 Checking if "/boot/grub/stage2" exists... yes
 Checking if "/boot/grub/e2fs_stage1_5" exists... yes
 Running "embed /boot/grub/e2fs_stage1_5 (hd0)"...  15 sectors are
embedded.
succeeded
 Running "install /boot/grub/stage1 (hd0) (hd0)1+15 p
(hd0,0)/boot/grub/stage2 /boot/grub/grub.conf"... succeeded
Done.
grub> root (hd1,0)
root (hd1,0)
 Filesystem type is ext2fs, partition type 0xfd
grub> setup (hd1)
setup (hd1)
 Checking if "/boot/grub/stage1" exists... yes
 Checking if "/boot/grub/stage2" exists... yes
 Checking if "/boot/grub/e2fs_stage1_5" exists... yes
 Running "embed /boot/grub/e2fs_stage1_5 (hd1)"...  15 sectors are
embedded.
succeeded
 Running "install /boot/grub/stage1 (hd1) (hd1)1+15 p
(hd1,0)/boot/grub/stage2 /boot/grub/grub.conf"... succeeded
Done.
grub> quit
quit
---------------------------------------------------------------------


Any idea what may be causing the problem?

Regards,
Daniel
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Re: SeaBIOS and GRUB booting from Virtio devices [was: GRUB and support for Virtio]

[Daniel Bareiro]

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On Tuesday, 24 August 2010 11:23:59 -0300,
Daniel Bareiro wrote:

> > Strange, i did 2 clean installs of centos 5.5 on an ubuntu 9.10 host
> > and it went flawless with virtio devices ( both disks and network ).

> Doing some tests with CentOS 5.5 on a KVM virtual machine, after doing
> the installation, I added a second disk. But when trying to boot from
> it, I get the following error:
> 
> ---------------------------------------------------------------------
> root (hd1,0)
> 
> Error 21: Selected disk does not exist
> ---------------------------------------------------------------------
> 
> 
> The two disks are Virtio devices that are recognized when booting from
> the first disk:
> 
> ---------------------------------------------------------------------
> [root@localhost ~]# fdisk -l /dev/vda
> 
> Disco /dev/vda: 10.7 GB, 10737418240 bytes
> 255 heads, 63 sectors/track, 1305 cylinders
> Unidades = cilindros de 16065 * 512 = 8225280 bytes
> 
> Disposit. Inicio    Comienzo      Fin      Bloques  Id  Sistema
> /dev/vda1   *           1        1174     9430123+  fd  Linux raid autodetect
> /dev/vda2            1175        1305     1052257+  fd  Linux raid autodetect
> [root@localhost ~]#
> [root@localhost ~]#
> [root@localhost ~]# fdisk -l /dev/vdb
> 
> Disco /dev/vdb: 10.7 GB, 10737418240 bytes
> 255 heads, 63 sectors/track, 1305 cylinders
> Unidades = cilindros de 16065 * 512 = 8225280 bytes
> 
> Disposit. Inicio    Comienzo      Fin      Bloques  Id  Sistema
> /dev/vdb1   *           1        1174     9430123+  fd  Linux raid autodetect
> /dev/vdb2            1175        1305     1052257+  fd  Linux raid autodetect
> ---------------------------------------------------------------------
> 
> The idea of these tests is to set up software RAID1 on a running
> system, since, it seems that Anaconda does not support installation on
> degraded RAID.
> 
> But I'm not sure if this is a problem of Virtio or that GRUB is not
> recognizing the second disk.
> 
> I made sure to modify /boot/grub/device.map with the entry for the new
> disk:
> 
> ---------------------------------------------------------------------
> [root@localhost grub]# cat /boot/grub/device.map
> # this device map was generated by anaconda
> (hd0)     /dev/vda
> (hd1)     /dev/vdb
> ---------------------------------------------------------------------
> 
> And the reconfiguration of GRUB on both disks did not give problems:
> 
> ---------------------------------------------------------------------
> [root@localhost grub]# grub --device-map=/boot/grub/device.map
> 
> 
>     GNU GRUB  version 0.97  (640K lower / 3072K upper memory)
> 
>  [ Minimal BASH-like line editing is supported.  For the first word, TAB
>    lists possible command completions.  Anywhere else TAB lists the
> possible
>    completions of a device/filename.]
> grub> root (hd0,0)
> root (hd0,0)
>  Filesystem type is ext2fs, partition type 0xfd
> grub> setup (hd0)
> setup (hd0)
>  Checking if "/boot/grub/stage1" exists... yes
>  Checking if "/boot/grub/stage2" exists... yes
>  Checking if "/boot/grub/e2fs_stage1_5" exists... yes
>  Running "embed /boot/grub/e2fs_stage1_5 (hd0)"...  15 sectors are
> embedded.
> succeeded
>  Running "install /boot/grub/stage1 (hd0) (hd0)1+15 p
> (hd0,0)/boot/grub/stage2 /boot/grub/grub.conf"... succeeded
> Done.
> grub> root (hd1,0)
> root (hd1,0)
>  Filesystem type is ext2fs, partition type 0xfd
> grub> setup (hd1)
> setup (hd1)
>  Checking if "/boot/grub/stage1" exists... yes
>  Checking if "/boot/grub/stage2" exists... yes
>  Checking if "/boot/grub/e2fs_stage1_5" exists... yes
>  Running "embed /boot/grub/e2fs_stage1_5 (hd1)"...  15 sectors are
> embedded.
> succeeded
>  Running "install /boot/grub/stage1 (hd1) (hd1)1+15 p
> (hd1,0)/boot/grub/stage2 /boot/grub/grub.conf"... succeeded
> Done.
> grub> quit
> quit
> ---------------------------------------------------------------------
> 
> 
> Any idea what may be causing the problem?

Martin Kraus seems that recently experienced a similar problem and this
was linked to SeaBIOS [1] and compiling the version from the git would
solve this problem. I had no problems with GRUB trying to boot from two
different IDE drives. 

I would like to know if there are plans to incorporate this to stable
KVM in the short term.

Regards,
Daniel

[1] http://www.spinics.net/lists/kvm/msg39928.html
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Re: SeaBIOS and GRUB booting from Virtio devices [was: GRUB and support for Virtio]

[Anthony Liguori]

On 08/24/2010 01:51 PM, Daniel Bareiro wrote:
>
> Martin Kraus seems that recently experienced a similar problem and this
> was linked to SeaBIOS [1] and compiling the version from the git would
> solve this problem. I had no problems with GRUB trying to boot from two
> different IDE drives.
>
> I would like to know if there are plans to incorporate this to stable
> KVM in the short term.
>    

No, but the next release is very soon and will have this.  It's a new 
feature.  There's never been

Regards,

Anthony Liguori

> Regards,
> Daniel
>
> [1] http://www.spinics.net/lists/kvm/msg39928.html
>