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Avihai Horon 94f775e428 vfio/migration: Add P2P support for VFIO migration 
VFIO migration uAPI defines an optional intermediate P2P quiescent
state. While in the P2P quiescent state, P2P DMA transactions cannot be
initiated by the device, but the device can respond to incoming ones.
Additionally, all outstanding P2P transactions are guaranteed to have
been completed by the time the device enters this state.

The purpose of this state is to support migration of multiple devices
that might do P2P transactions between themselves.

Add support for P2P migration by transitioning all the devices to the
P2P quiescent state before stopping or starting the devices. Use the new
VMChangeStateHandler prepare_cb to achieve that behavior.

This will allow migration of multiple VFIO devices if all of them
support P2P migration.

Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Tested-by: YangHang Liu <yanghliu@redhat.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
2023-09-11 08:34:05 +02:00
..
acpi-bits.rst Revert "tests: Use separate virtual environment for avocado" 2023-08-28 09:55:48 +02:00
atomics.rst atomics: eliminate mb_read/mb_set 2023-06-06 09:42:14 +02:00
bitops.rst docs: Create bitops.rst as example of kernel-docs 2019-12-17 19:36:57 +01:00
blkdebug.txt docs/: fix some comment spelling errors 2020-09-17 20:37:13 +02:00
blkverify.txt meson: link emulators without Makefile.target 2020-08-21 06:30:40 -04:00
block-coroutine-wrapper.rst block-coroutine-wrapper.py: introduce co_wrapper 2022-12-15 16:07:43 +01:00
build-system.rst meson: list leftover CONFIG_* symbols 2023-09-07 13:32:37 +02:00
ci-definitions.rst.inc tests/acceptance: rename tests acceptance to tests avocado 2021-11-08 17:00:22 +01:00
ci-jobs.rst.inc gitlab: enable ccache for many build jobs 2023-08-30 14:57:33 +01:00
ci-runners.rst.inc docs: name included files ".rst.inc" 2021-10-01 19:04:45 +02:00
ci.rst docs/devel: clean-up the CI links in the docs 2022-06-01 18:55:04 +01:00
clocks.rst clock: Provide builtin multiplier/divider 2021-09-01 11:08:19 +01:00
code-of-conduct.rst docs/devel: add a maintainers section to development process 2022-11-22 09:49:07 +00:00
conflict-resolution.rst docs: Add a QEMU Code of Conduct and Conflict Resolution Policy document 2021-04-01 13:21:02 +02:00
control-flow-integrity.rst Fix typo in CFI build documentation 2021-05-02 17:24:50 +02:00
decodetree.rst docs: Document decodetree named field syntax 2023-05-30 10:55:39 -07:00
ebpf_rss.rst docs/devel/ebpf_rss.rst: Format literals correctly 2021-08-02 11:42:38 +01:00
fuzzing.rst docs/fuzz: remove mentions of fork-based fuzzing 2023-02-16 23:02:46 -05:00
index-api.rst docs/devel: split qom-api reference into new file 2023-07-03 12:52:22 +01:00
index-build.rst acpi/tests/avocado/bits/doc: add a doc file to describe the acpi bits test 2022-11-02 06:56:32 -04:00
index-internals.rst docs/devel: start documenting writing VirtIO devices 2022-05-16 04:38:40 -04:00
index-process.rst docs/devel: add some front matter to the devel index 2023-07-03 12:52:08 +01:00
index-tcg.rst docs/devel: add some front matter to the devel index 2023-07-03 12:52:08 +01:00
index.rst docs/devel: add some front matter to the devel index 2023-07-03 12:52:08 +01:00
kconfig.rst configure, meson: remove target OS symbols from config-host.mak 2023-09-07 13:32:37 +02:00
loads-stores.rst bswap: Add the ability to store to an unaligned 24 bit field 2023-06-22 18:55:14 -04:00
lockcnt.txt docs: fix references to docs/devel/atomics.rst 2021-06-02 06:51:09 +02:00
maintainers.rst docs/devel: add a maintainers section to development process 2022-11-22 09:49:07 +00:00
memory.rst docs/devel: add some clarifying text for aliases 2022-01-18 12:56:29 +01:00
migration.rst docs/migration: Update postcopy bits 2023-07-26 10:55:56 +02:00
modules.rst docs: Spell QEMU all caps 2021-11-19 10:16:58 +01:00
multi-process.rst docs: Render binary names as monospaced text 2021-11-22 15:02:38 +01:00
multi-thread-tcg.rst docs: Spell QEMU all caps 2021-11-19 10:16:58 +01:00
multiple-iothreads.txt async: Add an optional reentrancy guard to the BH API 2023-04-28 11:31:07 +02:00
qapi-code-gen.rst docs/interop: Convert qmp-spec.txt to rST 2023-05-22 10:21:01 +02:00
qdev-api.rst docs/devel: split qom-api reference into new file 2023-07-03 12:52:22 +01:00
qgraph.rst Fix some typos in documentation (found by codespell) 2021-11-22 15:02:38 +01:00
qom-api.rst docs/devel: split qom-api reference into new file 2023-07-03 12:52:22 +01:00
qom.rst misc: Fix some typos in documentation and comments 2023-08-01 23:52:23 +02:00
qtest.rst tests: move libqtest.h back under qtest/ 2022-05-03 15:16:51 +04:00
rcu.txt Docs/RCU: Correct sample code of qatomic_rcu_set 2021-01-12 12:38:03 +01:00
replay.rst docs: move replay docs to docs/system/replay.rst 2022-06-06 09:26:54 +02:00
reset.rst hw/core/resettable: fix reset level counting 2022-10-27 10:27:23 +01:00
s390-dasd-ipl.rst docs: rstfy s390 dasd ipl documentation 2020-02-26 18:57:07 +01:00
secure-coding-practices.rst docs/secure-coding-practices: Describe how to use 'null-co' block driver 2021-06-02 14:29:14 +02:00
stable-process.rst docs: Fix botched rST conversion of 'submitting-a-patch.rst' 2021-11-22 15:02:38 +01:00
style.rst docs/style: permit inline loop variables 2023-08-30 14:57:44 +01:00
submitting-a-patch.rst docs/devel: try and improve the language around patch review 2022-11-22 09:52:23 +00:00
submitting-a-pull-request.rst docs/devel: add a maintainers section to development process 2022-11-22 09:49:07 +00:00
tcg-icount.rst tcg: Drop gen_io_end() 2021-09-08 11:09:45 +01:00
tcg-ops.rst docs/devel/tcg-ops: fix missing newlines in "Host vector operations" 2023-08-24 11:22:42 -07:00
tcg-plugins.rst docs: add a new section to outline emulation support 2023-02-02 10:44:23 +00:00
tcg.rst docs/devel: add some front matter to the devel index 2023-07-03 12:52:08 +01:00
testing.rst Revert "tests: Use separate virtual environment for avocado" 2023-08-28 09:55:48 +02:00
tracing.rst docs: trace-events-all is installed without renaming 2022-04-21 17:03:51 +04:00
trivial-patches.rst docs: Fix botched rST conversion of 'submitting-a-patch.rst' 2021-11-22 15:02:38 +01:00
ui.rst docs: Spell QEMU all caps 2021-11-19 10:16:58 +01:00
vfio-migration.rst vfio/migration: Add P2P support for VFIO migration 2023-09-11 08:34:05 +02:00
virtio-backends.rst docs/devel: start documenting writing VirtIO devices 2022-05-16 04:38:40 -04:00
virtio-migration.txt
writing-monitor-commands.rst qapi: Start to elide redundant has_FOO in generated C 2022-12-13 18:31:37 +01:00
zoned-storage.rst docs/zoned-storage:add zoned emulation use case 2023-05-15 08:19:04 -04:00