Merge tag 'migration-20240904-pull-request' of https://gitlab.com/farosas/qemu into staging

Migration pull request

- Steve's cleanup of unused variable
- Peter Maydell's fixes for several leaks in

Merge tag 'migration-20240904-pull-request' of https://gitlab.com/farosas/qemu into staging

Migration pull request

- Steve's cleanup of unused variable
- Peter Maydell's fixes for several leaks in migration-test
- Fabiano's flexibilization of multifd data structures for device
state migration
- Arman Nabiev's fix for ppc e500 migration
- Thomas' fix for migration-test vs. --without-default-devices

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# gpg: Good signature from "Fabiano Rosas <farosas@suse.de>" [unknown]
# gpg: aka "Fabiano Almeida Rosas <fabiano.rosas@suse.com>" [unknown]
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* tag 'migration-20240904-pull-request' of https://gitlab.com/farosas/qemu: (34 commits)
tests/qtest/migration: Add a check for the availability of the "pc" machine
target/ppc: Fix migration of CPUs with TLB_EMB TLB type
migration/multifd: Add documentation for multifd methods
migration/multifd: Add a couple of asserts for p->iov
migration/multifd: Fix p->iov leak in multifd-uadk.c
migration/multifd: Stop changing the packet on recv side
migration/multifd: Make MultiFDMethods const
migration/multifd: Move nocomp code into multifd-nocomp.c
migration/multifd: Register nocomp ops dynamically
migration/multifd: Standardize on multifd ops names
migration/multifd: Allow multifd sync without flush
migration/multifd: Replace multifd_send_state->pages with client data
migration/multifd: Don't send ram data during SYNC
migration/multifd: Isolate ram pages packet data
migration/multifd: Remove total pages tracing
migration/multifd: Move pages accounting into multifd_send_zero_page_detect()
migration/multifd: Replace p->pages with an union pointer
migration/multifd: Make MultiFDPages_t:offset a flexible array member
migration/multifd: Introduce MultiFDSendData
migration/multifd: Pass in MultiFDPages_t to file_write_ramblock_iov
...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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migration/multifd: Move pages accounting into multifd_send_zero_page_detect()

All references to pages are being removed from the multifd worker
threads in order to allow multifd to deal with differe

migration/multifd: Move pages accounting into multifd_send_zero_page_detect()

All references to pages are being removed from the multifd worker
threads in order to allow multifd to deal with different payload
types.

multifd_send_zero_page_detect() is called by all multifd migration
paths that deal with pages and is the last spot where zero pages and
normal page amounts are adjusted. Move the pages accounting into that
function.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>

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migration/multifd: Replace p->pages with an union pointer

We want multifd to be able to handle more types of data than just ram
pages. To start decoupling multifd from pages, replace p->pages
(Multi

migration/multifd: Replace p->pages with an union pointer

We want multifd to be able to handle more types of data than just ram
pages. To start decoupling multifd from pages, replace p->pages
(MultiFDPages_t) with the new type MultiFDSendData that hides the
client payload inside an union.

The general idea here is to isolate functions that *need* to handle
MultiFDPages_t and move them in the future to multifd-ram.c, while
multifd.c will stay with only the core functions that handle
MultiFDSendData/MultiFDRecvData.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>

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migration/multifd: Inline page_size and page_count

The MultiFD*Params structures are for per-channel data. Constant
values should not be there because that needlessly wastes cycles and
storage. The

migration/multifd: Inline page_size and page_count

The MultiFD*Params structures are for per-channel data. Constant
values should not be there because that needlessly wastes cycles and
storage. The page_size and page_count fall into this category so move
them inline in multifd.h.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>

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Merge tag 'migration-20240423-pull-request' of https://gitlab.com/peterx/qemu into staging

Migration pull for 9.1

- Het's new test cases for "channels"
- Het's fix for a typo for vsock parsing
- Ce

Merge tag 'migration-20240423-pull-request' of https://gitlab.com/peterx/qemu into staging

Migration pull for 9.1

- Het's new test cases for "channels"
- Het's fix for a typo for vsock parsing
- Cedric's VFIO error report series
- Cedric's one more patch for dirty-bitmap error reports
- Zhijian's rdma deprecation patch
- Yuan's zeropage optimization to fix double faults on anon mem
- Zhijian's COLO fix on a crash

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* tag 'migration-20240423-pull-request' of https://gitlab.com/peterx/qemu: (26 commits)
migration/colo: Fix bdrv_graph_rdlock_main_loop: Assertion `!qemu_in_coroutine()' failed.
migration/multifd: solve zero page causing multiple page faults
migration: Add Error** argument to add_bitmaps_to_list()
migration: Modify ram_init_bitmaps() to report dirty tracking errors
migration: Add Error** argument to xbzrle_init()
migration: Add Error** argument to ram_state_init()
memory: Add Error** argument to the global_dirty_log routines
migration: Introduce ram_bitmaps_destroy()
memory: Add Error** argument to .log_global_start() handler
migration: Add Error** argument to .load_setup() handler
migration: Add Error** argument to .save_setup() handler
migration: Add Error** argument to qemu_savevm_state_setup()
migration: Add Error** argument to vmstate_save()
migration: Always report an error in ram_save_setup()
migration: Always report an error in block_save_setup()
vfio: Always report an error in vfio_save_setup()
s390/stattrib: Add Error** argument to set_migrationmode() handler
tests/qtest/migration: Fix typo for vsock in SocketAddress_to_str
tests/qtest/migration: Add negative tests to validate migration QAPIs
tests/qtest/migration: Add multifd_tcp_plain test using list of channels instead of uri
...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

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migration/multifd: solve zero page causing multiple page faults

Implemented recvbitmap tracking of received pages in multifd.

If the zero page appears for the first time in the recvbitmap, this
pag

migration/multifd: solve zero page causing multiple page faults

Implemented recvbitmap tracking of received pages in multifd.

If the zero page appears for the first time in the recvbitmap, this
page is not checked and set.

If the zero page has already appeared in the recvbitmap, there is no
need to check the data but directly set the data to 0, because it is
unlikely that the zero page will be migrated multiple times.

Signed-off-by: Yuan Liu <yuan1.liu@intel.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240401154110.2028453-2-yuan1.liu@intel.com
[peterx: touch up the comment, as the bitmap is used outside postcopy now]
Signed-off-by: Peter Xu <peterx@redhat.com>

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Merge tag 'migration-20240311-pull-request' of https://gitlab.com/peterx/qemu into staging

Migration pull request

- Avihai's fix to allow vmstate iterators to not starve for VFIO
- Maksim's fix on

Merge tag 'migration-20240311-pull-request' of https://gitlab.com/peterx/qemu into staging

Migration pull request

- Avihai's fix to allow vmstate iterators to not starve for VFIO
- Maksim's fix on additional check on precopy load error
- Fabiano's fix on fdatasync() hang in mapped-ram
- Jonathan's fix on vring cached access over MMIO regions
- Cedric's cleanup patches 1-4 out of his error report series
- Yu's fix for RDMA migration (which used to be broken even for 8.2)
- Anthony's small cleanup/fix on err message
- Steve's patches on privatize migration.h
- Xiang's patchset to enable zero page detections in multifd threads

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* tag 'migration-20240311-pull-request' of https://gitlab.com/peterx/qemu: (34 commits)
migration/multifd: Add new migration test cases for legacy zero page checking.
migration/multifd: Enable multifd zero page checking by default.
migration/multifd: Implement ram_save_target_page_multifd to handle multifd version of MigrationOps::ram_save_target_page.
migration/multifd: Implement zero page transmission on the multifd thread.
migration/multifd: Add new migration option zero-page-detection.
migration/multifd: Allow clearing of the file_bmap from multifd
migration/multifd: Allow zero pages in file migration
migration: purge MigrationState from public interface
migration: delete unused accessors
migration: privatize colo interfaces
migration: migration_file_set_error
migration: migration_is_device
migration: migration_thread_is_self
migration: export vcpu_dirty_limit_period
migration: export migration_is_running
migration: export migration_is_active
migration: export migration_is_setup_or_active
migration: remove migration.h references
migration: export fewer options
migration: Fix format in error message
...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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migration/multifd: Implement zero page transmission on the multifd thread.

1. Add zero_pages field in MultiFDPacket_t.
2. Implements the zero page detection and handling on the multifd
threads for n

migration/multifd: Implement zero page transmission on the multifd thread.

1. Add zero_pages field in MultiFDPacket_t.
2. Implements the zero page detection and handling on the multifd
threads for non-compression, zlib and zstd compression backends.
3. Added a new value 'multifd' in ZeroPageDetection enumeration.
4. Adds zero page counters and updates multifd send/receive tracing
format to track the newly added counters.

Signed-off-by: Hao Xiang <hao.xiang@bytedance.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240311180015.3359271-5-hao.xiang@linux.dev
Signed-off-by: Peter Xu <peterx@redhat.com>

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