On Monday, September 1, 2014, Zbigniew Bodek <zbb@xxxxxxxxxxxx> wrote:
2014-09-01 11:56 GMT+02:00 Zbigniew Bodek <zbb@xxxxxxxxxxxx>:
> Hello Christopher,
>
> Please check out my answers in-line.
>
> Best regards
> zbb
>
> 2014-09-01 11:00 GMT+02:00 Christoffer Dall <christoffer.dall@xxxxxxxxxx>:
>> On Tue, Aug 26, 2014 at 12:17:17PM +0200, Zbigniew Bodek wrote:
>>> 2014-08-25 21:30 GMT+02:00 Joel Schopp <joel.schopp@xxxxxxx>:
>>> >
>>> > On 08/25/2014 02:03 PM, Peter Maydell wrote:
>>> >> On 25 August 2014 19:49, Joel Schopp <joel.schopp@xxxxxxx> wrote:
>>> >>> I'm guessing that the patches Peter posted recently might have a
>>> >>> positive effect on breakpoints and debugging with gdb.
>>> >>> https://lists.nongnu.org/archive/html/qemu-devel/2014-08/msg01291.html
>>> >> No, those relate to running a GDB inside the QEMU TCG guest,
>>> >> and won't affect an external gdb. What Zbigniew wants to do
>>> >> is use the QEMU gdbstub to debug the whole guest. For
>>> >> breakpoints to work in that when KVM is enabled requires
>>> >> implementing support for breakpoints and the debug
>>> >> interface in KVM and then the corresponding support for it
>>> >> in QEMU. This is on our todo list (those with cards.linaro.org
>>> >> access can find it as VIRT-116) but I don't think anybody's
>>> >> working on it right now.
>>> >>
>>> > Thanks for the clarification. So many todos, so little time.
>>>
>>> Hello again,
>>>
>>> Thank you all very much for your answers.
>>> Actually I use qemu with GDB as described here (-s -S, etc.), I've
>>> just posted the simplest command that I use to trigger the bug.
>>> So regarding your answers I would like to ask for some more clarification:
>>> * Has anyone encountered/reproduce this problem on your ARM host?
>>> * Any suggestion where to look in the KVM source for these kind of problems?
>>> * Maybe there is some unstable feature that I could disable in
>>> host/guest to narrow this issue?
>>>
>> Just checking: Are you compiling any of your kernels in Thumb-2 mode?
>> I believe the 5250 has a hardware bug with Thumb-2 and Hyp mode.
No, I am not compiling my kernels in Thumb-2 mode.
>>
>> Continuous reboots seems to work fine on my TC2. I can try giving it a
>> test on an Arndale some time in the near future. Which kernel version
>> (exact commit) are you using for your host and guest?
I used v3.17-rc1 which is: 7d1311b93e58ed55f3a31cc8f94c4b8fe988a2b9
Ok, and when you say reboot, do you mean executing 'reboot' in the guest or are you shutting down the qemu process completely and starting a new VM? Do you run any specific workload in the VM?
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