[PATCH 0/11] Rework guest debug interface / x86 debug register support -v2

[Jan Kiszka <jan.kiszka@web.de>]

Hi,

here comes the full series of patches to fix and enhance debugging
support of KVM. After completing hardware breakpoint support and
reorganizing the patches, I felt like I should post them all in a single
series, because my queue became quite long and potentially confusing in
the meantime.

The major changes or this revision are full hardware-assisted guest
debugging and a lot of refactoring on the userspace side. The latter was
motivated by an increasing inconsistency regarding which arch-specific
part should be handled in libkvm and which by qemu. I decided to push
everything into qemu, keeping the lib small (and easier to overcome one
day :->).

When I was trying to test the hardware breakpoint/watchpoint support
with gdb, the first result with quite disappointing: current gdb is
unable to handle such breakpoint remotely. There is hope, latest cvs has
it fixed - but suffers from other regressions which make it unusable for
kernel debugging. In the meantime, you can still write your own
"maintenance packet Z2,..." requests. :p

To give an overview of the series:
 Patch 1..3  - Critical debugger fixes for KVM (should be merge in any
               case)
 Patch 4..5  - QEMU refactoring, required for following KVM patches, but
               also of generic use for QEMU (rebase and feature
               enhancements are required to get them in shape for
               upstream)
 Patch 6..8  - New guest debugging interface and SMP support
 Patch 9..11 - Kernel-side changes for new guest debugging interface and
               proper x86 debug register virtualization

Jan

PS: If anyone wants to be dropped from CC, just let me know.