After a IRC chat with Ben Howard, I'm tagging this as verified in
Precise.
** Tags removed: verification-needed-precise
** Tags added: verification-done-precise
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This bug is awaiting verification that the kernel for Precise in
-proposed solves the problem (3.2.0-35.55). Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-precise' to 'verification-done-precise'.
If verification is not
** Branch linked: lp:ubuntu/linux-lowlatency
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https://bugs.launchpad.net/bugs/929545
Title:
Hyper-V: PV Drivers for Ubuntu guests running on Hyper-V lose root
device to ata_piix
To
This bug was fixed in the package linux - 3.2.0-18.29
---
linux (3.2.0-18.29) precise; urgency=low
[ Andy Whitcroft ]
* [Config] restore build-% shortcut
* SAUCE: ata_piix: defer disks to the Hyper-V drivers by default
- LP: #929545, #942316
[ Eugeni Dodonov ]
*
Ok this fix was incomplete as the CDROM/DVD are not supported via the
hyper-v paravirt drivers. An updated fix is now applied.
** Changed in: linux (Ubuntu)
Status: Fix Released = Fix Committed
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This bug was fixed in the package linux - 3.2.0-17.26
---
linux (3.2.0-17.26) precise; urgency=low
[ Andy Whitcroft ]
* [Config] clean up the human consumable package descriptions
* [Config] fix generic flavour description
* [Config] clean up linux-tools package descriptions
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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Title:
Hyper-V: PV Drivers for Ubuntu guests running on Hyper-V lose root
** Changed in: linux (Ubuntu)
Status: Confirmed = Fix Committed
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Title:
Hyper-V: PV Drivers for Ubuntu guests running on Hyper-V lose root
We have pulled together a backport from that currnetly sitting in linux-
next, roughtly what will hit 3.4, we have combined that with the fixes
to the ata_piix driver identified above. @Mike could you test that for
us in combination with the initramfs tools bits you already have. The
kernel
I've confirmed that the combination of linux-image (from above) and the
initramfs-tools / initramfs-tools-bin from
http://people.canonical.com/~apw/lp917135-precise/ result in a system
booting and using hv_storvsc to handle the root device instead of
ata_piix.
-M
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So at least some of the disk is readable as we were able to see and
report the partition table:
[6.665440] scsi 0:0:0:0: Direct-Access Msft Virtual Disk 1.0
PQ: 0 ANSI: 4
[6.672178] sd 0:0:0:0: [sda] 167772160 512-byte logical blocks: (85.8
GB/80.0 GiB)
[6.678902] sd
After some internal investigation, this is a known issue in the build of
hv_storvsc that is present in the Ubuntu kernel sources, including
3.2.0-16. The latest version of the driver, available in linux-next
after Feb 14 (at its new location in /drivers/scsi/storvsc_drv.c) has
that resolved, as
Ok I've put together updating initramfs-tools which should include the
correct hv_* module which hopefully will allow the right drivers to be
loaded. Could you install the initramfs-tools from the URL below. You
will also need to ensure the initramfs is rebuilt, and then retest as
before:
Hi,
The intention here is to boot every disk volume using the virtual
Hyper-V SCSI adapter? That would be different than the procedure for
setting up VM guest disks (on Windows systems only?) as described in
Microsoft's Hyper-V docs, but maybe that is the goal.
from
@Tim -- I can't claim to have ever booted in this environment. The
request to switch the boot disks over to the paravirtualised drivers was
made as the performance over IDE is poor. It has been suggested by
those in the know so I am assuming that it should work, though as I say
I do not have
This doesn't change what the VM boots from - we still require that the
system boot from an IDE disk. What this does enable is our hv_storvsc
driver to control the root device, which uses hv_vmbus to communicate
with dom0. hv_storvsc and hv_blkvsc were merged upstream a while back,
and hv_storvsc
@Mike -- I think we both mean the same thing, I just am looking at
things from inside. Did the new kerenl and initramfs-tools combination
work for you?
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Andy, what's the correct process to try both the kernel-image and the
updated initramfs-tools? I installed the kernel-image, the initramfs-
tools, and the initramfs-tools-bin package at once using dpkg -i, but
I'm still getting the same hang as before.
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@Mike -- I think i would expect that to work in that combination. Could
we:
1) install all three and then confirm that the initramfs image at least
contains the required drivers, using something like the below (remember
to sub in the right kernel version):
zcat
@Mike -- if you are able to get onto freenode irc, then you might also
like to come find me there, we might be able to diagnose this quicker
there.
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Ah-ha.
mike@ubuntu:~$ sudo zcat /boot/initrd.img-3.2.0-16-generic | cpio -it |
grep hv_
lib/modules/3.2.0-16-generic/kernel/drivers/hv/hv_vmbus.ko
lib/modules/3.2.0-16-generic/kernel/drivers/hv/hv_utils.ko
lib/modules/3.2.0-16-generic/kernel/drivers/staging/hv/hv_mouse.ko
Just an update as to where we are on this bug:
With the updated packages from apw, I've confirmed that hv_storvsc is
present in the initrd from -pre6 combined with the early 3.2.0-16.
However, after a reboot, the system barfs a bunch of errors about
rejecting I/O due to an offline device. Output
@Mike -- i suspect that that actually means it worked. But of course
with the other bug, you don't have the drivers in your initramfs. I'll
have to get an updated initramfs package for you as well.
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** Summary changed:
- PV Drivers for Ubuntu guests running on Hyper-V unable to control root device
+ Hyper-V: PV Drivers for Ubuntu guests running on Hyper-V lose root device to
ata_piix
** Changed in: linux (Ubuntu)
Assignee: (unassigned) = Andy Whitcroft (apw)
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** Tags removed: kernel-request-3.2.0-15.24 precise
** Tags added: bot-quit-nagging
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Title:
Hyper-V: PV Drivers for Ubuntu guests running on
Ok. I have attempted to add hyper-v detection to the ata_piix driver.
This basically defers handling to hyper-v by default if the hypervisor
is detected. I have also added an override to allow this to be
suppressed from the command line. Could someone with a hyper-v based
cloud test the kernels
I've tested this, but it doesn't appear to work as expected. I installed
today's precise-server ISO and then installed the new linux-image via
dpkg -i. Checking /sys/block/sda/device/driver/0:0:0:0/vendor reported
the driver as ATA instead of Msft as we would expect.
** Attachment added: dmesg
** Attachment added: dmesg when using the prefer_ms_hyperv=0 flag
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/929545/+attachment/2730134/+files/prefer_ms_hyperv.out
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Hmm, looks like the patch isn't quite right. I'll spin a replacement
test kernel shortly.
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Title:
Hyper-V: PV Drivers for Ubuntu guests running
Ok I've updated the test kernels hopefully fixing the issue. If we
could re-test the as before. Thanks.
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Title:
Hyper-V: PV Drivers for Ubuntu
That didn't seem to work either - it was unable to mount the root
filesystem. If there are steps that I can do within the shell to further
diagnose, let me know.
** Attachment added: Boot failure.
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