All I like qemu very much and know it could debug the kernel.
I tried what I searched on web but couldn't stop at the break point. Below is what I did. 1. Both host and guest installed the same OS, Fedora16 x86_64. 2. Compile the qemu with ./configure --target-list=x86_64-softmmu --enable-kvm --enable-debug-tcg --enable-debug --enable-trace-backend=simple 3. With this command I can boot up my guest. ./../qemu/x86_64-softmmu/qemu-system-x86_64 -enable-kvm -smp 4 -m 1024 -boot dc fedora16.img -monitor stdio 4. I git clone the kernel source in the guest and make a new kernel and initrd. I start the guest with this new kernel successfully 5. I copy out the initrd.img and the .config of kernel to host. compile the kernel on host. the kernel source code is identical on host and gueset, 6. I start the guest with the kernel and initrd on host ./../qemu/x86_64-softmmu/qemu-system-x86_64 -enable-kvm -smp 4 -m 1024 -boot dc fedora16.img -monitor stdio -kernel ~/git/linux-yinghai/arch/x86_64/boot/bzImage -initrd ~/git/debug/initramfs-3.0.0.img -append "root=/dev/mapper/vg_wizard-lv_root ro rd.lvm.lv=vg_wizard/lv_root rd.md=0 rd.lvm.lv=vg_wizard/lv_swap" This works fine. 7. Then I start the guest with gdbstub option ./../qemu/x86_64-softmmu/qemu-system-x86_64 -enable-kvm -smp 4 -m 1024 -boot dc fedora16.img -monitor stdio -kernel /home/ywywyang/git/linux-yinghai/arch/x86_64/boot/bzImage -initrd /home/ywywyang/git/debug/initramfs-3.0.0.img -append "root=/dev/mapper/vg_wizard-lv_root ro rd.lvm.lv=vg_wizard/lv_root rd.md=0 rd.lvm.lv=vg_wizard/lv_swap" -S -gdb tcp::4321 Then the guest stop at the beginning. 8. Attach the gdb in the kernel source directory gdb file vmlinux target remote localhost:4321 b start_kernel c Then the guest will run very happily.... Also use the "info b " could show the break point is set. Which step I made a mistake? -- Wei Yang Help You, Help Me