Shutdown requests are normally hardware dependent. By extending pvpanic to also handle shutdown requests, guests can submit such requests with an easily implementable and cross-platform mechanism.
The background is the usage of minimal Linux kernels with different architectures for testing purposes. Poweroff support varies highly per architecture and requires a bunch of code to be compiled to work. pvpanic on the other hand is very small and uniform. Patch 1, 2 and 3 are general cleanups, which seem useful even without this proposal being implemented. They should also be ready to be picked up from the series on their own. A corresponding patch has been submitted for Linux [0]. This is also where the request was voiced to drop move away from a pvpanic uapi header in Linux. [0] https://lore.kernel.org/lkml/20231104-pvpanic-shutdown-v1-1-5ee7c9b3e...@weissschuh.net/ Signed-off-by: Thomas Weißschuh <tho...@t-8ch.de> --- Changes in v6: - Replace magic constant "4" in tests with PVPANIC_SHUTDOWN - Link to v5: https://lore.kernel.org/r/20240129-pvpanic-shutdown-v5-0-f5a060b87...@t-8ch.de Changes in v5: - Add patch from Alejandro to emit a QMP event. - Update cover letter. - Add tests. - Link to v4: https://lore.kernel.org/r/20240107-pvpanic-shutdown-v4-0-81500a7e4...@t-8ch.de Changes in v4: - Rebase on 8.2 master - Resend after tree reopened and holidays - Link to v3: https://lore.kernel.org/r/20231129-pvpanic-shutdown-v3-0-c9a2892fc...@t-8ch.de Changes in v3: - Drop from Linux imported pvpanic header as discussed with Cornelia and requested by Greg - Link to v2: https://lore.kernel.org/r/20231128-pvpanic-shutdown-v2-0-830393b45...@t-8ch.de Changes in v2: - Remove RFC status - Add Ack from Thomas to 2nd patch - Fix typo in title of 2nd patch - Link to v1: https://lore.kernel.org/r/20231104-pvpanic-shutdown-v1-0-023531578...@t-8ch.de --- Alejandro Jimenez (1): pvpanic: Emit GUEST_PVSHUTDOWN QMP event on pvpanic shutdown signal Thomas Weißschuh (5): linux-headers: drop pvpanic.h hw/misc/pvpanic: centralize definition of supported events tests/qtest/pvpanic: use centralized definition of supported events hw/misc/pvpanic: add support for normal shutdowns tests/qtest/pvpanic: add tests for pvshutdown event docs/specs/pvpanic.rst | 2 ++ hw/misc/pvpanic-isa.c | 3 +-- hw/misc/pvpanic-pci.c | 3 +-- hw/misc/pvpanic.c | 8 ++++-- include/hw/misc/pvpanic.h | 5 ++++ include/standard-headers/linux/pvpanic.h | 9 ------- include/sysemu/runstate.h | 1 + qapi/run-state.json | 14 ++++++++++ scripts/update-linux-headers.sh | 3 +-- system/runstate.c | 6 +++++ tests/qtest/pvpanic-pci-test.c | 44 ++++++++++++++++++++++++++++++-- tests/qtest/pvpanic-test.c | 34 ++++++++++++++++++++++-- 12 files changed, 111 insertions(+), 21 deletions(-) --- base-commit: 9e34f127f419b3941b36dfdfac79640dc81e97e2 change-id: 20231104-pvpanic-shutdown-02e4b4cb4949 Best regards, -- Thomas Weißschuh <tho...@t-8ch.de>
