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

[Antti Antinoja]

Tested with 4.14.105 kernel and the XP guest now boots fine with Qemu 3.1.0-r4.

My _guess_ is that this issue has something to do with changes made to kvm_amd 
module. 

Cheers,
Antti

On Sat, 20 Apr 2019 07:41:17 +0800
Antti Antinoja <address@hidden> wrote:

> 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 <address@hidden>
> 


-- 
Antti Antinoja <address@hidden>