The existing guest debugging interface of kvm is limited in several ways: - depends on hardware breakpoints, thus suffers from running out of this scarce resource. - assumes that there are only 4 hardware breakpoints (even if some archs may once provide more) - doesn't support watchpoint or additional arch-specific debugging features
This patch series reworks the interface, providing usable software-based
breakpoint support, but also laying the ground for patches under
development that will add full hardware debugging features.
Content:
Patch 1 - Replace KVM_DEBUG_GUEST with KVM_SET_GUEST_DEBUG interface,
implement kernel side support
Patch 2 - Tiny helper that allows pause and resume for a single vcpu
Patch 3 - Userland changes that adopt KVM_SET_GUEST_DEBUG and switch to
software breakpoints
Depends on:
- "Fix monitor and gdbstub deadlocks v2" [1]
- "Proper vm_stop on debug events" [2]
It's late here and the series is still fresh, but everything seems to
works nicely - even using gdb inside the guest while the host has active
breakpoints on the guest as well.
Looking forward to feedback and review.
Jan
[1] http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/17444
[2] http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/17775
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