Hi,

After upgrading host (Gentoo Linux) a Windows XP guest can't boot anymore.

Some findings while testing:

* XP image boots & works OK on an Intel machine (Gentoo Linux)
** qemu: 3.1.0-r4
** kernel: 5.0.7
** CPU: Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz

* XP image FAILS to boot on an AMD machine (Gentoo Linux)
** qemu: 3.1.0-r4
** kernel: 4.19.34
** CPU: AMD FX-6300 Six-Core Processor
** image boots OK if NOT using --enable-kvm

* XP image FAILS to boot on an AMD machine (Gentoo Linux)
** qemu: 3.1.0-r4 & 3.1.0-r1
** kernel: 4.19.34 & 5.0.7
** CPU: AMD Opteron(tm) Processor 4170 HE
** image boots OK if NOT using --enable-kvm
** The image worked OK on this machine with Qemu 2.12.1 & Kernel 4.18.20

Booting to Safe Mode fails too (on mentioned AMD machines with --enbale-kvm). 

Trying various -cpu options on the AMD machines didn't seem to help either 
(qemu64, pentium3, etc).

There are no errors visible on the host (kernel logs etc clean). The guest boot 
just interrupts on very early state and Windows safe mode menu will loop 
forever.

All Linux VM's are working without issues.

Cheers,
Antti

-- 
Antti Antinoja <rea...@fennosys.fi>

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