Re: [Qemu-stable] Crash KVM internal error

[Michael Roth]

Quoting Peter Kasza (2015-10-06 11:23:55)
> 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 \

cpus should be equal to (sockets * cores * threads). Try it with
cpus=8,sockets=1,cores=4,threads=2 or cpus=4,sockets=1,cores=4,threads=1

Also, address@hidden is the proper list for general queries. This list
is for maintainence of past/stable releases.

> >     -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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