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