Re: E5-2620v2 - emulation stop error

Andrey Korolyov
2015-03-05T23:44:28Z

On Fri, Mar 6, 2015 at 1:14 AM, Andrey Korolyov <andrey@xdel.ru> wrote:
> Hello,
>
> recently I`ve got a couple of shiny new Intel 2620v2s for future
> replacement of the E5-2620v1, but I experienced relatively many events
> with emulation errors, all traces looks simular to the one below. I am
> running qemu-2.1 on x86 on top of 3.10 branch for testing purposes but
> can switch to some other versions if necessary. Most of crashes
> happened during reboot cycle or at the end of ACPI-based shutdown
> action, if this can help. I have zero clues of what can introduce such
> a mess inside same processor family using identical software, as
> 2620v1 has no simular problem ever. Please let me know if there can be
> some side measures for making entire story more clear.
>
> Thanks!
>
> KVM internal error. Suberror: 2
> extra data[0]: 800000d1
> extra data[1]: 80000b0d
> EAX=00000003 EBX=00000000 ECX=00000000 EDX=00000000
> ESI=00000000 EDI=00000000 EBP=00000000 ESP=00006cd4
> EIP=0000d3f9 EFL=00010202 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
> ES =0000 00000000 0000ffff 00009300
> CS =f000 000f0000 0000ffff 00009b00
> SS =0000 00000000 0000ffff 00009300
> DS =0000 00000000 0000ffff 00009300
> FS =0000 00000000 0000ffff 00009300
> GS =0000 00000000 0000ffff 00009300
> LDT=0000 00000000 0000ffff 00008200
> TR =0000 00000000 0000ffff 00008b00
> GDT= 000f6e98 00000037
> IDT= 00000000 000003ff
> CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
> DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000
> DR3=0000000000000000
> DR6=00000000ffff0ff0 DR7=0000000000000400
> EFER=0000000000000000
> Code=48 18 67 8c 00 8c d1 8e d9 66 5a 66 58 66 5d 66 c3 cd 02 cb <cd>
> 10 cb cd 13 cb cd 15 cb cd 16 cb cd 18 cb cd 19 cb cd 1c cb fa fc 66
> b8 00 e0 00 00 8e

It turns out that those errors are introduced by APICv, which gets
enabled due to different feature set. If anyone is interested in
reproducing/fixing this exactly on 3.10, it takes about one hundred of
migrations/power state changes for an issue to appear, guest OS can be
Linux or Win.