Re: [Xen-users] hvm, handle_mmio: failed to get instruction length

[Tom Brown <tbrown@xxxxxxxxxxxxx>]

Is there a problem booting 2.4 kernels compiled on Redhat 7 machines? 
After some sweat and cursing I've gotten a config where grub works 
reliably, and I can get a 2.6 kernel to boot before it spills its guts all 
over, but I can not get an old 2.4 kernel to boot ... I should dig out a 
2.2 kernel, as that actually would have a purpose, but I was under the 
belief (possibly/probably self delusion) that running linux kernels with 
HVM would be easy...

I've tried xen-3.0.2-2 and -unstable and now -testing... all with the same 
result. With unstable I did find a patch for can not find an E820 memory 
map... but I have not been able to find a fix for this one...

(XEN) Code bytes around(len=256) c01fc909:
(XEN) c01fc900:0f 0d 86 40 01 00 00 0f 6f 06 0f 6f 4e 08 0f 6f 
(XEN) c01fc910:56 10 0f 6f 5e 18 0f 7f 03 0f 7f 4b 08 0f 7f 53 
(XEN) c01fc920:10 0f 7f 5b 18 0f 6f 46 20 0f 6f 4e 28 0f 6f 56 
(XEN) c01fc930:30 0f 6f 5e 38 0f 7f 43 20 0f 7f 4b 28 0f 7f 53 
(XEN) c01fc940:30 0f 7f 5b 38 4f 83 c6 40 83 c3 40 83 ff 05 7f 
(XEN) c01fc950:af eb 45 0f 6f 06 0f 6f 4e 08 0f 6f 56 10 0f 6f 
(XEN) c01fc960:5e 18 0f 7f 03 0f 7f 4b 08 0f 7f 53 10 0f 7f 5b 
(XEN) c01fc970:18 0f 6f 46 20 0f 6f 4e 28 0f 6f 56 30 0f 6f 5e 
(XEN) c01fc980:38 0f 7f 43 20 0f 7f 4b 28 0f 7f 53 30 0f 7f 5b 
(XEN) c01fc990:38 4f 83 c6 40 83 c3 40 85 ff 7f b7 89 e8 83 e0 
(XEN) c01fc9a0:3f 89 c1 c1 e9 02 89 df f3 a5 a8 02 74 02 66 a5 
(XEN) c01fc9b0:a8 01 74 01 a4 0f 20 c0 83 c8 08 0f 22 c0 8b 04 
(XEN) c01fc9c0:24 5a 5b 5e 5f 5d c3 89 f6 8d bc 27 00 00 00 00 
(XEN) c01fc9d0:53 8b 5c 24 08 e8 d6 f6 f0 ff 0f ef c0 b8 3f 00 
(XEN) c01fc9e0:00 00 8d b4 26 00 00 00 00 8d bc 27 00 00 00 00 
(XEN) c01fc9f0:0f e7 03 0f e7 43 08 0f e7 43 10 0f e7 43 18 0f 
(XEN) handle_mmio: failed to get instruction length
(XEN) domain_crash_sync called from platform.c:846
(XEN) Domain 12 (vcpu#0) crashed on cpu#1:


any thoughts? AFAIK, there is nothing magic here. I can post configs if 
needed, but the dump seems like it is supposed to be sufficient. No, I 
have not compared all the hex dumps to see if they are consistent... hhmm, 
that probably is a good idea... yes, it looks quite repeatable.

-Tom

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