Re: [Qemu-devel] Using --enable-kvm fails with WindowsXP guest on an AMD host (works on Intel host)

[balducci]

(apologies if this doesn't get properly threaded into:
http://lists.nongnu.org/archive/html/qemu-devel/2019-04/msg03407.html)

> 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

Same here, on an AMD Athlon(tm) X4 860K Quad Core Processor

AFAICS, something has gone wrong starting with kernel-5.0.6

For me:
            GOOD      BAD
            4.20.14   5.0.6
            5.0.2     5.0.7
            5.0.3
            5.0.4
            5.0.5

Full details available in my earlier report here
https://bugzilla.kernel.org/show_bug.cgi?id=203327

I've updated my original report with a reference to this one.

ciao
-gabriele