On Wed, Oct 24, 2012 at 6:27 PM, Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> wrote: > Hi, > > I've tried to play with kexec using lkvm. Unfortunately, lkvm crashes when > I try to switch to crashkernel. > > I use Linus tree + penberg/kvmtool/next + one x86 mm patch[1]. > > Kernel is defconfig + kvmconfig. I use the same kernel image for system and > crash env. > > Host: > > % lkvm run --cpus 1 -m 1024 --params 'crashkernel=256M loglevel=8' > > Guest: > > # kexec -p bzImage --reuse-cmdline > # echo c > /proc/sysrq-trigger > ... > [ 0.947984] loop: module loaded > [ 0.950078] virtio-pci 0000:00:01.0: irq 40 for MSI/MSI-X > [ 0.950925] virtio-pci 0000:00:01.0: irq 41 for MSI/MSI-X > [ 0.952944] virtio-pci 0000:00:01.0: irq 42 for MSI/MSI-X > zsh: segmentation fault (core dumped) lkvm run --cpus 1 -m 1024 --params 'crashkernel=256M loglevel=8' This seems to work OK on my machine. > Guest kernel is somewhere in virtio_net initialization (for the second > time). I'm too lazy to find exact line. > > Backtrace: > > 0 irq__add_msix_route (kvm=kvm@entry=0xbf8010, msg=0xe3d090) at x86/irq.c:210 > #1 0x000000000041b3bf in virtio_pci__specific_io_out.isra.5 (offset=<optimized out>, > data=<optimized out>, kvm=0xbf8010) at virtio/pci.c:150 > #2 virtio_pci__io_out.9406 (ioport=<optimized out>, kvm=0xbf8010, port=<optimized out>, > data=<optimized out>, size=<optimized out>) at virtio/pci.c:208 > #3 0x000000000040f8c3 in kvm__emulate_io (count=<optimized out>, size=2, direction=1, > data=<optimized out>, port=25108, kvm=0xbf8010) at ioport.c:165 > #4 kvm_cpu__start (cpu=<optimized out>) at x86/include/kvm/kvm-cpu-arch.h:41 > #5 0x0000000000416ca2 in kvm_cpu_thread.2824 (arg=<optimized out>) at builtin-run.c:176 > #6 0x00007f701ebd0b50 in start_thread (arg=<optimized out>) at pthread_create.c:304 > #7 0x00007f701e1fe70d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112 > #8 0x0000000000000000 in ?? () Looks like vpci->msix_table might not be initialized properly. Sasha, Asias, care to take a look at this? Pekka -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html