[Qemu-stable] Crash KVM internal error

[Peter Kasza]

Hi everyone,

I've recently had a system update and I'm currently running qemu
v2.4.0 on Linux 4.2.2. I'm using an Intel i7, which has 4 cores and
whenever I try to start a guest with kvm enabled and the smp cores set
to 4 I get the following crash:

> KVM internal error. Suberror: 1
> emulation failure
> EAX=00000023 EBX=00000002 ECX=00000000 EDX=00000600
> ESI=00000000 EDI=00001fc2 EBP=00000000 ESP=00000000
> EIP=00001000 EFL=00010002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
> ES =0000 00000000 0000ffff 00009300 DPL=0 DS16 [-WA]
> CS =9f00 0009f000 0000ffff 00009b00 DPL=0 CS16 [-RA]
> SS =0000 00000000 0000ffff 00009300 DPL=0 DS16 [-WA]
> DS =9f00 0009f000 0000ffff 00009300 DPL=0 DS16 [-WA]
> FS =0000 00000000 0000ffff 00009300 DPL=0 DS16 [-WA]
> GS =0000 00000000 0000ffff 00009300 DPL=0 DS16 [-WA]
> LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
> TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
> GDT=     bff10f18 0000003f
> IDT=     00000000 0000ffff
> CR0=00000033 CR2=00000000 CR3=00000000 CR4=00000000
> DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 
> DR3=0000000000000000
> DR6=00000000ffff0ff0 DR7=0000000000000400
> EFER=0000000000000000
> Code=af af af af af af af af af af af af af af af af af af af af <00> 00 00 
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
> 00

If I set cpus to a lower number, the guest starts fine. The guest used
to work with 4 cpus before the update.

I'm using the following command to start the guest:
> /usr/bin/qemu-system-x86_64 \
>     -enable-kvm -m 4096 -cpu host,kvm=off \
>     -smp cpus=4,sockets=1,cores=4,threads=2 \
>     -mem-path /dev/hugepages \
>     -drive if=pflash,format=raw,readonly,file=/usr/share/ovmf/ovmf_x64.bin

Is this a kernel or a qemu issue? Did anyone experiance the same error?

Any help is appreciated.

-- 
Best Regards,
Peter Kasza

http://www.itinsight.hu
address@hidden

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