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 >> >> Thanks, >> -Christoffer _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
