testing and gdbstub updates:

- add a check-rust test to docker builds
   - re-factor the qtest logic to be cleaner
   - fix tests to not clock_step when no timers enabled
   - roll-up log prefix into qtest_send
   - cleaner error reporting when qtest_clock_set fails
   - revert old deadlock fix now tests are updated
   - only run full set of migration tests under HW acceleration
   - support late attachment to user-mode gdbstubs
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Merge tag 'pull-10.0-testing-and-gdstub-updates-100225-1' of https://gitlab.com/stsquad/qemu into staging

testing and gdbstub updates:

  - add a check-rust test to docker builds
  - re-factor the qtest logic to be cleaner
  - fix tests to not clock_step when no timers enabled
  - roll-up log prefix into qtest_send
  - cleaner error reporting when qtest_clock_set fails
  - revert old deadlock fix now tests are updated
  - only run full set of migration tests under HW acceleration
  - support late attachment to user-mode gdbstubs

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# gpg: Signature made Mon 10 Feb 2025 08:54:51 EST
# gpg:                using RSA key 6685AE99E75167BCAFC8DF35FBD0DB095A9E2A44
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* tag 'pull-10.0-testing-and-gdstub-updates-100225-1' of https://gitlab.com/stsquad/qemu:
  tests/tcg: Add late gdbstub attach test
  docs/user: Document the %d placeholder and suspend=n QEMU_GDB features
  gdbstub: Allow late attachment
  osdep: Introduce qemu_kill_thread()
  user: Introduce host_interrupt_signal
  user: Introduce user/signal.h
  gdbstub: Try unlinking the unix socket before binding
  gdbstub: Allow the %d placeholder in the socket path
  tests/qtest/migration: Pick smoke tests
  tests/qtest/migration: Add --full option
  Revert "util/timer: avoid deadlock when shutting down"
  tests/qtest: tighten up the checks on clock_step
  tests/qtest: rename qtest_send_prefix and roll-up into qtest_send
  tests/qtest: simplify qtest_process_inbuf
  tests/qtest: don't step clock at start of npcm7xx periodic IRQ test
  tests/qtest: don't attempt to clock_step while waiting for virtio ISR
  tests/docker: replicate the check-rust-tools-nightly CI job

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

docs/user/main.rst

@@ -54,7 +54,7 @@ Command line options
 
 ::
 
-   qemu-i386 [-h] [-d] [-L path] [-s size] [-cpu model] [-g port] [-B offset] [-R size] program [arguments...]
+   qemu-i386 [-h] [-d] [-L path] [-s size] [-cpu model] [-g endpoint] [-B offset] [-R size] program [arguments...]
 
 ``-h``
    Print the help
@@ -91,8 +91,18 @@ Debug options:
    Activate logging of the specified items (use '-d help' for a list of
    log items)
 
-``-g port``
-   Wait gdb connection to port
+``-g endpoint``
+   Wait gdb connection to a port (e.g., ``1234``) or a unix socket (e.g.,
+   ``/tmp/qemu.sock``).
+
+   If a unix socket path contains single ``%d`` placeholder (e.g.,
+   ``/tmp/qemu-%d.sock``), it is replaced by the emulator PID, which is useful
+   when passing this option via the ``QEMU_GDB`` environment variable to a
+   multi-process application.
+
+   If the endpoint address is followed by ``,suspend=n`` (e.g.,
+   ``1234,suspend=n``), then the emulated program starts without waiting for a
+   connection, which can be established at any later point in time.
 
 ``-one-insn-per-tb``
    Run the emulation with one guest instruction per translation block.