Rework guest debug interface
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b4 am [email protected]Versions newest first
- v1 Latest3 patches 1 replyIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/3 | KVM: Rework guest debugging interfacearch/ arch/ arch/ +11 more | +168 | 0 replies | |
| 2/3 | qemu-kvm: Introduce single vcpu pause/resumeqemu/ | +22 | 1 reply | |
| 3/3 | kvm-userspace: Switch to KVM_SET_GUEST_DEBUGlibkvm/ libkvm/ libkvm/ +7 more | +268 | 0 replies |
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Cover letter [PATCH 0/3] Rework guest debug interface
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