[Xen-devel] RFT: gdbserver-xen update to 6.8 and SMP fixes

["Kip Macy" <kip.macy@xxxxxxxxx>]

Could anyone who is using the gdbserver-xen from tools/debugger/gdb
please try out the following patch:

http://www.fsmware.com/xen/gdbserver-xen-6.8-upgrade.diff

It should apply cleanly to xen-3.3-testing.hg.

You will need to re-build and re-install libxenctl before building
gdbserver-xen.

This patch makes the following changes:
- Make xc_ptrace and xc_waitdomain look and act sufficiently like
ptrace and waitpid that code calling ptrace and waitpid does not need
to be modified
- Fix handling for case when attaching to a guest where not all APs are online
- Detect which vcpu hit a breakpoint or was doing single-stepping so
that gdb will switch to the vcpu that caused the trap

Debugging SMP guests should actually work reliably now. Note that when
using the remote protocol the GDB client won't know about any new
threads until 'info threads' is requested.

The changes to support xen using gdbserver are much less intrusive
than previously. In principle, future updates should be quite easy.
The code has only been changed to account for the fact that pid and
lwpid are not the same for VMs whereas they are for user processes.
The pid is analogous to the domid and lwpid is analogous to the
vcpuid.

Thanks,
Kip

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