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. I sent an RFC[0] for this before to qemu-devel and lkml which didn't generate feedback, so let's discuss the concrete proposal. Patch 1 and 2 are general cleanups, that seems useful even without this proposal being implemented. A corresponding patch has been submitted for Linux [1]. This is also where the request was voiced to drop move away from a pvpanic uapi header in Linux. [0] https://lore.kernel.org/all/984794aa-4af0-4c68-a74e-7420ec315...@t-8ch.de/ [1] https://lore.kernel.org/lkml/20231104-pvpanic-shutdown-v1-1-5ee7c9b3e...@weissschuh.net/ Signed-off-by: Thomas Weißschuh <tho...@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 --- Thomas Weißschuh (4): 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 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 --------- scripts/update-linux-headers.sh | 3 +-- tests/qtest/pvpanic-pci-test.c | 5 +++-- tests/qtest/pvpanic-test.c | 5 +++-- 9 files changed, 22 insertions(+), 21 deletions(-) --- base-commit: abf635ddfe3242df907f58967f3c1e6763bbca2d change-id: 20231104-pvpanic-shutdown-02e4b4cb4949 Best regards, -- Thomas Weißschuh <tho...@t-8ch.de>
