[Libguestfs] hang after seabios

[Zetan Drableg]

Ok now we are getting somewhere! Those old vars did the trick.
libguestfs-test-tool launched with qemu-wrapper as expected with the
debug port open.
Now on to the fun part!

(gdb) set architecture i8086
The target architecture is assumed to be i8086
(gdb) break *0x7c00
Breakpoint 1 at 0x7c00
(gdb) target remote :1234
Remote debugging using :1234
0x0000fff0 in ?? ()
(gdb) cont
Continuing.

The breakpoint you documented as when the boot sector has been loaded
into memory by the BIOS and control is passed to the boot sector.
Never hits the breakpoint.....

Next steps?

Do I need to load a symbol table? Where might I find it?


On Fri, Aug 1, 2014 at 12:24 AM, Richard W.M. Jones <rjones at redhat.com> wrote:
> On Thu, Jul 31, 2014 at 03:32:18PM -0700, Zetan Drableg wrote:
>> Ok -
>> By the way, I looked into updating out KVM versions. Since we already
>> have so many KVM servers of this version in production, I can't easily
>> forklift update everything without much testing.
>>
>> exec /usr/libexec/qemu-kvm -s -S "$@"
>>
>> export LIBGUESTFS_HV=/root/work/qemu-wrapper
>> export LIBGUESTFS_BACKEND=direct
>>
>> How do I simulate the setup of devices the test tool perform?
>> Just copy/pasting the qemu-kvm argument list doesn't work.
>>
>> I was hoping that LIBGUESTFS_HV would replace usage of
>> /usr/libexec/qemu-kvm with /root/work/qemu-wrapper, but does not
>> appear to
>
> OK I think the problem is that it's libguestfs 1.20, where the
> environment variable names are different (check guestfs(3) in your
> local copy).  This should work:
>
>   export LIBGUESTFS_ATTACH_METHOD=appliance
>   export LIBGUESTFS_QEMU=/root/work/qemu-wrapper
>
> There's an additional problem which is you need the wrapper to
> distinguish between -help and -version tests and the final command.
> Use a wrapper like this:
>
> ----------------------------------------------------------------------
> #!/bin/bash -
>
> qemu=/usr/libexec/qemu-kvm
>
> if ! echo "$@" | grep -sqE -- '-help|-version'; then
>   echo QEMU debugging enabled.
>   debug="-s -S"
> fi
>
> exec $qemu $debug "$@"
> ----------------------------------------------------------------------
>
> The wrapper must be executable.
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-p2v converts physical machines to virtual machines.  Boot with a
> live CD or over the network (PXE) and turn machines into KVM guests.
> http://libguestfs.org/virt-v2v