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[Qemu-devel] [Bug 1310324] Re: Commit 0f842f8a introduces regression whe


From: Giovanni Mascellani
Subject: [Qemu-devel] [Bug 1310324] Re: Commit 0f842f8a introduces regression when using tcg-interpreter
Date: Sun, 20 Apr 2014 17:20:39 -0000

I forgot: winxp_test.img is just an empty 15 GB (sparse) file.

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https://bugs.launchpad.net/bugs/1310324

Title:
  Commit 0f842f8a introduces regression when using tcg-interpreter

Status in QEMU:
  New

Bug description:
  Hi.

  Commit 0f842f8a246f2b5b51a11c13f933bf7a90ae8e96 apparently introduces
  a regression when using --enable-tcg-interpreter. The regression is
  manifested as follows:

   1. Checkout any qemu commit later or equal that the one said above. Beside 
that one, I tested v1.7.1, v2.0.0 and a few other commits suggested to my by 
git bisect.
   2. Possibly cherry-pick commit a32b12741bf45bf3f46bffe5a79cb2548a060cd8, 
which fixes a compilation bug with --enable-tcg-interpreter.
   3. Compile with: ./configure --target-list=i386-softmmu 
--enable-tcg-interpreter && make -j8
   4. Create an empty virtual disk and try to install Windows XP on it booting 
from Windows CD-ROM. After the loading program, the installer immediately 
crashes with blue screen (it should instead show the installation confirmation 
dialog and then the EULA acceptance dialog, if it worked correctly).

  I'm mentioning Windows XP because it is the problem I found. Probably
  other operating systems would fail as well. I can test others, if you
  think it would be helpful. I can also give you access to the very
  exact CD-ROM image I'm using.

  The exact command line I'm using is:
  build_location/i386-softmmu/qemu-system-i386 -m 512 -drive 
file=winxp_test.img -cdrom wipxp_cdrom.iso

  Attached is the blue screen that I see (unfortunately it is Italian,
  but that's a standard error message and I hope this is not a problem).

  I'm not able to understand the nature of the commit to identify what
  could be the problem. My nose tells me that it may be some stupid
  mistake, for example in some offset constant, that nobody ever saw
  because tcg-interpreter is not much used.

  Thanks, Giovanni.

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