[Bug 1404396] Re: [regression] vgabios -> seabios breaks (my) 16-bit applications

[Launchpad Bug Tracker]

This bug was fixed in the package seabios - 1.7.4-4ubuntu1

---
seabios (1.7.4-4ubuntu1) trusty-proposed; urgency=medium

  * Turn off VGA_ALLOCATE_EXTRA_STACK (LP: #1404396)

 -- Serge Hallyn   Wed, 26 Aug 2015 15:25:11
-0500

** Changed in: seabios (Ubuntu Trusty)
   Status: Fix Committed => Fix Released

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  [regression] vgabios -> seabios breaks (my) 16-bit applications

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[Bug 1404396] Re: [regression] vgabios -> seabios breaks (my) 16-bit applications

[Simon Déziel]

Hi Richard, were you able to test the proposed package? Thanks

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[Bug 1404396] Re: [regression] vgabios -> seabios breaks (my) 16-bit applications

[Richard Laager]

I seem to have forgotten. I'll test it today, for sure.

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[Bug 1404396] Re: [regression] vgabios -> seabios breaks (my) 16-bit applications

[Richard Laager]

I can confirm that the proposed package fixes the issue. I tested before
the change by rebooting the guest using the stock SeaBIOS, and it was
broken. I installed seabios-1.7.4-4ubuntu1 from trusty-proposed and
rebooted the guest. It works now.

** Tags removed: verification-needed
** Tags added: verification-done

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Serge Hallyn]

fwiw I've not been able to reproduce this failure.

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  [regression] vgabios - seabios breaks (my) 16-bit applications

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Brian Murray]

Hello Richard, or anyone else affected,

Accepted seabios into trusty-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/seabios/1.7.4-4ubuntu1
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: seabios (Ubuntu Trusty)
   Status: New = Fix Committed

** Tags added: verification-needed

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Richard Laager]

I will test the proposed package. I'm leaving for the weekend, so it
won't be until Sunday night / Monday morning (US/Central) at best, and
possibly the next night. But I will report back ASAP.

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Launchpad Bug Tracker]

** Branch linked: lp:ubuntu/trusty-proposed/seabios

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Serge Hallyn]

** Description changed:

+ ===
+ Impact: Unable to run 16-bit applications in windows
+ Fix: turn off VGA_ALLOCATE_EXTRA_STACK
+ Test case: (see comment #21)
+ Regression potential: This stops the allocation of extra vga stack so could
+   conceivably break other applications.  However all tests cases in
+   the qemu regression tests pass, and this has been enabled for some
+   time in wily.
+ ===
  Upgrading from Ubuntu Precise to Ubuntu Trusty broke one of my guests.
  
  I've recently upgraded a host from Ubuntu Precise (qemu-kvm-1.0) to
  Ubuntu Trusty (qemu 2.0.0). I have a Windows 2008 32-bit OS running on a
  64-bit VM that runs a 16-bit line of business application. (While I
  realize that upgrade the application is the right answer, I can't.)
  The Windows VM boots, but the business application crashes on startup.
  Changing the VM to be a 32-bit VM doesn't help.
  
  After several hours of compiling and testing intermediate qemu versions,
  I accidentally stumbled into the real issue. Trusty has switched from
  vgabios to seabios:
  
  PRECISE $ ls -la /usr/share/qemu/vgabios*
  lrwxrwxrwx 1 root root 22 Dec 10 18:37 /usr/share/qemu/vgabios.bin - 
../vgabios/vgabios.bin
  lrwxrwxrwx 1 root root 29 Dec 10 18:37 /usr/share/qemu/vgabios-cirrus.bin - 
../vgabios/vgabios.cirrus.bin
  lrwxrwxrwx 1 root root 26 Dec 10 18:37 /usr/share/qemu/vgabios-qxl.bin - 
../vgabios/vgabios.qxl.bin
  lrwxrwxrwx 1 root root 29 Dec 10 18:37 /usr/share/qemu/vgabios-stdvga.bin - 
../vgabios/vgabios.stdvga.bin
  lrwxrwxrwx 1 root root 29 Dec 10 18:37 /usr/share/qemu/vgabios-vmware.bin - 
../vgabios/vgabios.vmware.bin
  
  TRUSTY $ ls -la /usr/share/qemu/vgabios*
  lrwxrwxrwx 1 root root 29 Dec 10 18:50 /usr/share/qemu/vgabios.bin - 
../seabios/vgabios-isavga.bin
  lrwxrwxrwx 1 root root 29 Dec 10 18:50 /usr/share/qemu/vgabios-cirrus.bin - 
../seabios/vgabios-cirrus.bin
  lrwxrwxrwx 1 root root 26 Dec 10 18:50 /usr/share/qemu/vgabios-qxl.bin - 
../seabios/vgabios-qxl.bin
  lrwxrwxrwx 1 root root 29 Dec 10 18:50 /usr/share/qemu/vgabios-stdvga.bin - 
../seabios/vgabios-stdvga.bin
  lrwxrwxrwx 1 root root 29 Dec 10 18:50 /usr/share/qemu/vgabios-vmware.bin - 
../seabios/vgabios-vmware.bin
  
  I installed the vgabios package and made my own tree of symlinks:
  
  $ ls -l /usr/share/wiktel-server-vmhost/vgabios/
  total 0
  lrwxrwxrwx 1 root root 27 Dec 17 00:40 bios.bin - /usr/share/seabios/bios.bin
  lrwxrwxrwx 1 root root 23 Dec 17 00:40 keymaps - /usr/share/qemu/keymaps
  lrwxrwxrwx 1 root root 30 Dec 17 00:40 vgabios.bin - 
/usr/share/vgabios/vgabios.bin
  lrwxrwxrwx 1 root root 37 Dec 17 00:40 vgabios-cirrus.bin - 
/usr/share/vgabios/vgabios.cirrus.bin
  lrwxrwxrwx 1 root root 34 Dec 17 00:40 vgabios-qxl.bin - 
/usr/share/vgabios/vgabios.qxl.bin
  lrwxrwxrwx 1 root root 37 Dec 17 00:40 vgabios-stdvga.bin - 
/usr/share/vgabios/vgabios.stdvga.bin
  lrwxrwxrwx 1 root root 37 Dec 17 00:40 vgabios-vmware.bin - 
/usr/share/vgabios/vgabios.vmware.bin
  
  Then I added this to the guest XML:
  domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'
-   qemu:commandline
- qemu:arg value='-L'/
- qemu:arg value='/usr/share/wiktel-server-vmhost/vgabios'/
-   /qemu:commandline
+   qemu:commandline
+ qemu:arg value='-L'/
+ qemu:arg value='/usr/share/wiktel-server-vmhost/vgabios'/
+   /qemu:commandline
  /domain
  
  This makes it work. Is this the long-term answer? Or should this change
  from vgabios to seabios be reverted? Or should libvirt be modified to
  accept rom file=... for video, as discussed here:
  https://bugzilla.redhat.com/show_bug.cgi?id=811227#c9 Or should I try to
  get the seabios developers to help debug and fix this?

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  [regression] vgabios - seabios breaks (my) 16-bit applications

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Serge Hallyn]

Actually, I just got a failure from the qa regression tests:

==
FAIL: test_virtio_net (__main__.QemuGuestVirtio)
Test virtio net
--
Traceback (most recent call last):
  File ./test-qemu.py, line 1441, in test_virtio_net
self._ssh_cmd(['lsmod'], search=virtio_net)
  File ./test-qemu.py, line 1203, in _ssh_cmd
self.assertEquals(expected, rc, result + report)
AssertionError: Got exit code 255, expected 0
Connection timed out during banner exchange

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Launchpad Bug Tracker]

** Branch linked: lp:ubuntu/wily-proposed/seabios

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Serge Hallyn]

Thanks, in vista i was able to reproduce.  Just turning the default in
vga/Kconfig to n fixes it.  I also tried debian's 1.8.2 package but it
fails.

I'm going to run full qemu and libvirt testsuites (from lp;qa-
regression-testing) with that package to hopefully find any regressions,
then merge debian's 1.8.2 and add this patch on top.

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Richard Laager]

Excellent!

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Richard Laager]

I realized later that my laptop doesn't run Trusty. It runs vivid. So
disregard my previous comment.

Anyway, we're running Windows Server 2008 (not R2, which is only
available in 64-bit). That's based on Vista, so maybe try Vista? This is
still reproducible for me in my test environment. SkiFree 16-bit crashes
immediately on startup. I never even see the game window.

I'd be happy to test any packages you build for the SRU.

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Serge Hallyn]

On a stock wily kvm instance with 32-bit win8.1, ski.zip runs fine.
I'll assume that seabios 1.8.1-2ubuntu1  fixed it, and proceed to
testing the CONFIG_VGA_ALLOCATE_EXTRA_STACK=n in prep for final SRU to
trusty.


** Changed in: seabios (Ubuntu)
   Status: Triaged = Fix Released

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Richard Laager]

I'll have to do more testing. I can't reproduce this on my trusty laptop
at the moment.

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Serge Hallyn]

Hm, I installed win8.1 32-bit in kvm inside a trusty container, but
still ski.zip runs fine for me.

Do I need to run an older windows release?  Is there some amount of time
I should play before ski.zip crashes?

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Richard Laager]

Try Windows 7.

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Serge Hallyn]

So given comment #16, the 1.8.1 package currently in wily would still
need htat change?

If not, I'll mark it fix released.  if so, I'll push a new package with
that change and then push the proposed trusty package.

** Changed in: seabios (Ubuntu Trusty)
   Importance: Undecided = High

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Serge Hallyn]

Also, for the SRU process, could you add a concise test case to the
description above?

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Richard Laager]

Try to run 16-bit SkiFree in a 32-bit Windows OS inside a VM. You can
download it here: http://ski.ihoc.net/ski.zip It does not work on Trusty
(presumably through Wily) as-is, but if you set
CONFIG_VGA_ALLOCATE_EXTRA_STACK=n, it will work. (I haven't re-tested
this today, but that's what I and upstream were finding.)

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Serge Hallyn]

** Also affects: seabios (Ubuntu)
   Importance: Undecided
   Status: New

** Changed in: seabios (Ubuntu)
   Importance: Undecided = High

** Changed in: seabios (Ubuntu)
   Status: New = Triaged

** Also affects: qemu (Ubuntu Trusty)
   Importance: Undecided
   Status: New

** Also affects: seabios (Ubuntu Trusty)
   Importance: Undecided
   Status: New

** No longer affects: qemu (Ubuntu Trusty)

** No longer affects: qemu (Ubuntu)

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Title:
  [regression] vgabios - seabios breaks (my) 16-bit applications

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Richard Laager]

Upstream has a new patch that fixes this without any known breakage. I
tested it and confirmed it fixes things for me. However, it doesn't
apply to 1.7.4. I propose setting CONFIG_VGA_ALLOCATE_EXTRA_STACK=n
until the next seabios release after 1.8.1.

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Richard Laager]

No, that's the patch which adds EXTRA_STACK and breaks it.

Kevin O'Connor intends to finish up a patch using his option 5 soon:
 I'm inclined to go with option 5.  The real patch for that option,
 however, is a little bigger.  I should be able to send a more complete
 patch in the next couple of days.
-- http://www.seabios.org/pipermail/seabios/2015-January/008562.html

There's already a patch he wrote which fixes this using a different
approach, but if he's going to fix this upstream shortly, we might as
well wait a few more days for that.

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Title:
  [regression] vgabios - seabios breaks (my) 16-bit applications

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Re: [Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Serge Hallyn]

Sounds good, thanks.

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Title:
  [regression] vgabios - seabios breaks (my) 16-bit applications

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Serge Hallyn]

So is the patch in
http://www.seabios.org/pipermail/seabios/2015-January/008546.html the
one which definately fixes it?

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https://bugs.launchpad.net/bugs/1404396

Title:
  [regression] vgabios - seabios breaks (my) 16-bit applications

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Serge Hallyn]

Thanks - just to be clear, was ther eany downside to setting
CONFIG_VGA_ALLOCATE_EXTRA_STACK=n?

** Changed in: qemu (Ubuntu)
   Status: New = Confirmed

** Changed in: qemu (Ubuntu)
   Importance: Undecided = Medium

** Changed in: qemu (Ubuntu)
   Importance: Medium = High

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Title:
  [regression] vgabios - seabios breaks (my) 16-bit applications

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Richard Laager]

There's no downside for me.
http://www.seabios.org/pipermail/seabios/2015-January/008546.html and
http://www.seabios.org/pipermail/seabios/2015-January/008547.html have a
couple of answers. Basically, CONFIG_VGA_ALLOCATE_EXTRA_STACK improves
things for some old DOS programs. No examples were given.

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Title:
  [regression] vgabios - seabios breaks (my) 16-bit applications

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Richard Laager]

I see I haven't given a status update here... There were a couple of
patches on the mailing list. One definitely fixes it. The other fixes
it, but possibly (I should retest) breaks video output while booting (on
seabios git, but not 1.7.4).

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Title:
  [regression] vgabios - seabios breaks (my) 16-bit applications

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Richard Laager]

Yes, this is reproducible with 16-bit Skifree. There's more discussion
on the mailing list, but the takeaway so far is that I can confirm that
setting CONFIG_VGA_ALLOCATE_EXTRA_STACK=n fixes this.

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Title:
  [regression] vgabios - seabios breaks (my) 16-bit applications

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Paolo Bonzini]

Can you reproduce with other 16-bit applications (e.g. skifree from
http://ski.ihoc.net/#download)?

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Title:
  [regression] vgabios - seabios breaks (my) 16-bit applications

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Paolo Bonzini]

Also, can you attach a screenshot of the 16-bit application with
vgabios, so we can have a clue of why the vgabios is involved?

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Title:
  [regression] vgabios - seabios breaks (my) 16-bit applications

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Richard Laager]

I built an updated seabios using the source from git and the debian
directory from Debian's 1.7.5-1. It has the same problem.

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Title:
  [regression] vgabios - seabios breaks (my) 16-bit applications

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Richard Laager]

** Attachment added: screenshot1.png
   
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1404396/+attachment/4294333/+files/screenshot1.png

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Title:
  [regression] vgabios - seabios breaks (my) 16-bit applications

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Richard Laager]

** Attachment added: screenshot2.png
   
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1404396/+attachment/4294334/+files/screenshot2.png

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Title:
  [regression] vgabios - seabios breaks (my) 16-bit applications

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[Bug 1404396] Re: [regression] vgabios - seabios breaks (my) 16-bit applications

[Richard Laager]

I rebuilt seabios git with CONFIG_DEBUG_LEVEL=8 and added the following
options, as per:
http://www.seabios.org/pipermail/seabios/2011-May/001718.html

  qemu:commandline
qemu:arg value='-chardev'/
qemu:arg value='stdio,id=seabios'/
qemu:arg value='-device'/
qemu:arg value='isa-debugcon,iobase=0x402,chardev=seabios'/
  /qemu:commandline

I've attached the log file from the guest. All of the log output is from
booting. No additional output appears when running the 16-bit
application. I've also attached screenshots of the error in the guest,
though I doubt they'll be very useful.

** Attachment added: Log from the guest, with only the GUEST and HOST 
hostnames obscured.
   
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1404396/+attachment/4294332/+files/GUEST.log

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Title:
  [regression] vgabios - seabios breaks (my) 16-bit applications

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