On 08/24/2011 01:16 AM, Alexander Graf wrote:
On LinuxCon I had a nice chat with Linus on what he thinks kvm-tool would be doing and what he expects from it. Basically he wants a small and simple tool he and other developers can run to try out and see if the kernel they just built actually works.Fortunately, Qemu can do that today already! The only piece that was missing was the "simple" piece of the equation, so here is a script that wraps around Qemu and executes a kernel you just built. If you do have KVM around and are not cross-compiling, it will use KVM. But if you don't, you can still fall back to emulation mode and at least check if your kernel still does what you expect. I only implemented support for s390x and ppc there, but it's easily extensible to more platforms, as Qemu can emulate (and virtualize) pretty much any platform out there. If you don't have qemu installed, please do so before using this script. Your distro should provide a package for it (might even call it "kvm"). If not, just compile it from source - it's not hard! To quickly get going, just execute the following as user: $ ./Documentation/run-qemu.sh -r / -a init=/bin/bash This will drop you into a shell on your rootfs. Happy hacking! + +function has_config() { + grep "CONFIG_$1=y" .config +}
grep -q ?
+ case "$1" in + -a|--append) + KERNEL_APPEND2="$2"
Might want to append to KERNEL_APPEND2, so you could have multiple -a args.
+echo " + ################# Linux Qemu launcher ################# + +This script executes your currently built Linux kernel using Qemu. If KVM is +available, it will also use KVM for fast virtualization of your guest. + +The intent is to make it very easy to run your kernel. If you need to do more +advanced things, such as passing through real devices, please take the command +line shown below and modify it to your needs. This tool is for simplicity, not +world dominating functionality coverage.
Device assignment could be useful for driver developers, yes.
+" +echo "\ +Your guest is bound to the current foreground shell. To quit the guest, +please use Ctrl-A x" +echo " Executing: $QEMU_BIN $QEMU_OPTIONS -append \"$KERNEL_APPEND\" -smp $SMP" +echo + +exec $QEMU_BIN $QEMU_OPTIONS -append "$KERNEL_APPEND -smp $SMP"
Would be nice to support launching gdb in a separate terminal with vmlinux already loaded, and already attached to qemu.
-- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.
