[PATCH v4 0/2] Add gdbstub support to HVF

[francesco . cagnin]

From: Francesco Cagnin <fcagnin@quarkslab.com>

This patch series aims to add gdbstub support to HVF (the 'QEMU
accelerator on macOS that employs Hypervisor.framework') on Apple
Silicon hosts.

The proposed implementation, structured like the KVM counterpart,
handles single-stepping, software breakpoints, hardware breakpoints and
hardware watchpoints.

The patch has been most recently tested working on macOS Ventura 13.3
hosts and single-core Linux kernel 5.19 guests with the test script
'tests/guest-debug/test-gdbstub.py' (slightly updated to make it work
with Linux kernels compiled on macOS, see
https://gitlab.com/qemu-project/qemu/-/issues/1489).

The patch still has uninvestigated issues with multi-cores guests (see
thread https://www.mail-archive.com/qemu-devel@nongnu.org/msg932884.html).

v4:
* Add license and copyright comment in 'hyp_gdbstub.c'
* Fix build on x86 macos
* Add architecture specific functions to check guest debug support
* Move include to the top of the file in 'hvf.h'
* Merge patches 2 and 3 from previous patch series
* Re-inject EC_AA64_BKPT into the guest if unhandled
* Add comments explaining how debug registers are handled
* Minor refactor around debug registers for readability
* Other minor changes

Francesco Cagnin (2):
  arm: move KVM breakpoints helpers
  hvf: implement guest debugging on Apple Silicon hosts

 accel/hvf/hvf-accel-ops.c | 115 +++++++
 accel/hvf/hvf-all.c       |  23 ++
 include/sysemu/hvf.h      |  34 ++
 include/sysemu/hvf_int.h  |   1 +
 target/arm/hvf/hvf.c      | 709 +++++++++++++++++++++++++++++++++++++-
 target/arm/hyp_gdbstub.c  | 253 ++++++++++++++
 target/arm/internals.h    |  50 +++
 target/arm/kvm64.c        | 276 ---------------
 target/arm/meson.build    |   3 +-
 target/i386/hvf/hvf.c     |  33 ++
 10 files changed, 1218 insertions(+), 279 deletions(-)
 create mode 100644 target/arm/hyp_gdbstub.c

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2.40.0