On 04.08.2010 12:31, Avi Kivity wrote:
On 08/04/2010 10:38 AM, André Weidemann wrote:
Please enable ftrace:
# mount -t debugfs debugfs /sys/kernel/debug
# cd /sys/kernel/debug/tracing
# echo 100000 > buffer_size_kb
# echo kvm > set_event
# echo 1 > tracing on
run the guest and kill qemu immediately when you get to the blank screen
(use SDL so you can see it immediately). Then post
/sys/kernel/debug/trace somewhere.
I ran the trace and put the ouptut here:
http://ilpss8.dyndns.org/~andrew/qemu-kvm.trace.gz
<...>-26008 [001] 5175193.046430: kvm_exit: reason exception rip 0xfc842
<...>-26008 [001] 5175193.046430: kvm_page_fault: address fc842
error_code 9
<...>-26008 [001] 5175193.046432: kvm_entry: vcpu 0
<...>-26008 [001] 5175193.046434: kvm_exit: reason cr_access rip 0xfc796
<...>-26008 [001] 5175193.046435: kvm_cr: cr_write 0 = 0x10
<...>-26008 [001] 5175193.046442: kvm_entry: vcpu 0
<...>-26008 [001] 5175193.046444: kvm_exit: reason exception rip 0xfc799
<...>-26008 [001] 5175193.046447: kvm_entry: vcpu 0
<...>-26008 [001] 5175193.046449: kvm_exit: reason exception rip 0xfc799
<...>-26008 [001] 5175193.046449: kvm_page_fault: address feffd066
error_code 9
<...>-26008 [001] 5175193.046453: kvm_inj_virq: irq 13
#GP at fc799.
fc78f: 0f 20 c0 mov %cr0,%eax
fc792: 66 83 e0 fe and $0xfffffffe,%eax
fc796: 0f 22 c0 mov %eax,%cr0
fc799: ea 9e c7 00 f0 ljmp $0xf000,$0xc79e
I think we're in big real mode and your kernel has trouble emulating the
ljmp. Can you try latest seabios[1]? Commit 0f788893a8bba has a workaround.
[1] git://git.linuxtogo.org/home/kevin/seabios.git
Thank you very much. Running qemu-kvm with the latest seabios fixed the
problem. The VM is running fine again.
Best Regards
André
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