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Bug#932550: qemu-system-x86: WinXP no longer boots with --enable-kvm, stops at \Windows\System32\Drivers\Mup.sys

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Dear Maintainer,
I found that I could also reproduce this issue on my AMD Ryzen 7.

Based on the modification date of my VM it was working
with Buster/testing at least at 2018-08-24 at this hardware.

I tested the binaries qemu-system-x86_64 down to 2.12+dfsg-2 and
also current qemu git, all show the VM fail the same way.

So I guessed it might be a kernel or firmware issue (firmware
got updated in between).

Then I found following:
    https://lkml.org/lkml/2019/5/4/113

So maybe 4.19.28+2 (4.19.0-4) does not yet contain the first [1] change,
or a kernel >= 4.19.40 may contain the fix [2] already.
In the regular tree this first change appeared
with v5.1-rc3, and the fix in v5.1.

Kind regards,
Bernhard


[1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.19.y&id=b9733a74350d6ab2e1a36bface0e3b36866945de
    -> Maybe the introducing change, first in Linux 4.19.33 (2019-04-03)

[2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.19.y&id=499bbe739d5aeb1bb775fed5523902f840cbe67b
    -> Maybe fix contained in Linux 4.19.40 (2019-05-05)

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Bug#932550: qemu-system-x86: WinXP no longer boots with --enable-kvm, stops at \Windows\System32\Drivers\Mup.sys "Dr. Oliver Muth" <Dr.O.Muth@habmalnefrage.de> - 2019-07-20 17:00 +0200
  Bug#932550: qemu-system-x86: WinXP no longer boots with --enable-kvm, stops at \Windows\System32\Drivers\Mup.sys Michael Tokarev <mjt@tls.msk.ru> - 2019-07-23 16:50 +0200
    Bug#932550: qemu-system-x86: WinXP no longer boots with --enable-kvm, stops at \Windows\System32\Drivers\Mup.sys "Dr. Oliver Muth" <Dr.O.Muth@habmalnefrage.de> - 2019-07-25 16:50 +0200
  Bug#932550: qemu-system-x86: WinXP no longer boots with --enable-kvm, stops at \Windows\System32\Drivers\Mup.sys Bernhard Übelacker <bernhardu@mailbox.org> - 2019-08-07 20:00 +0200
    Bug#932550: qemu-system-x86: WinXP no longer boots with --enable-kvm, stops at \Windows\System32\Drivers\Mup.sys MAG4 Piemonte <mag4@aruba.it> - 2019-08-13 16:30 +0200

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