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Paolo Bonzini 9458a9a1df memory: fix race between TCG and accesses to dirty bitmap 
There is a race between TCG and accesses to the dirty log:

      vCPU thread                  reader thread
      -----------------------      -----------------------
      TLB check -> slow path
        notdirty_mem_write
          write to RAM
          set dirty flag
                                   clear dirty flag
      TLB check -> fast path
                                   read memory
        write to RAM

Fortunately, in order to fix it, no change is required to the
vCPU thread.  However, the reader thread must delay the read after
the vCPU thread has finished the write.  This can be approximated
conservatively by run_on_cpu, which waits for the end of the current
translation block.

A similar technique is used by KVM, which has to do a synchronous TLB
flush after doing a test-and-clear of the dirty-page flags.

Reported-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
 		2019-08-20 17:26:20 +02:00
..
Makefile.objs COLO: Remove colo_state migration struct 2018-10-19 11:15:03 +08:00
block-dirty-bitmap.c qapi: implement block-dirty-bitmap-remove transaction action 2019-08-16 16:28:03 -04:00
block.c block/dirty-bitmap: add bdrv_dirty_bitmap_get 2019-08-16 16:28:02 -04:00
block.h migration: disable auto-converge during bulk block migration 2017-09-27 11:27:14 +01:00
channel.c migration: fix the multifd code when receiving less channels 2019-01-23 15:02:07 +00:00
channel.h migration: Route errors down through migration_channel_connect 2018-02-06 10:55:12 +00:00
colo-failover.c migration/colo.c: Remove redundant input parameter 2019-05-14 17:33:35 +01:00
colo.c sysemu: Split sysemu/runstate.h off sysemu/sysemu.h 2019-08-16 13:37:36 +02:00
exec.c migration: unify incoming processing 2018-07-10 12:48:53 +01:00
exec.h migration: Export exec.c functions in its own file 2017-06-01 18:49:22 +02:00
fd.c migration: Fix fd protocol for incoming defer 2019-06-05 12:43:55 +02:00
fd.h migration: Fix fd protocol for incoming defer 2019-06-05 12:43:55 +02:00
global_state.c sysemu: Split sysemu/runstate.h off sysemu/sysemu.h 2019-08-16 13:37:36 +02:00
migration.c Header cleanup patches for 2019-08-13 2019-08-16 14:53:43 +01:00
migration.h Header cleanup patches for 2019-08-13 2019-08-16 14:53:43 +01:00
page_cache.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
page_cache.h migration: Make cache_init() take an error parameter 2017-10-23 18:03:25 +02:00
postcopy-ram.c Header cleanup patches for 2019-08-13 2019-08-16 14:53:43 +01:00
postcopy-ram.h migration/postcopy: make PostcopyDiscardState a static variable 2019-08-14 17:33:14 +01:00
qemu-file-channel.c Header cleanup patches for 2019-08-13 2019-08-16 14:53:43 +01:00
qemu-file-channel.h migration: Export qemu-file-channel.c functions in its own file 2017-05-18 19:20:50 +02:00
qemu-file.c migration: add qemu_file_update_transfer interface 2019-08-14 17:33:14 +01:00
qemu-file.h Header cleanup patches for 2019-08-13 2019-08-16 14:53:43 +01:00
qjson.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
qjson.h typedefs: add QJSON 2018-06-15 14:40:56 +01:00
ram.c memory: fix race between TCG and accesses to dirty bitmap 2019-08-20 17:26:20 +02:00
ram.h Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
rdma.c Header cleanup patches for 2019-08-13 2019-08-16 14:53:43 +01:00
rdma.h migration: Export rdma.c functions in its own file 2017-06-01 18:49:23 +02:00
savevm.c Header cleanup patches for 2019-08-13 2019-08-16 14:53:43 +01:00
savevm.h savevm: split the process of different stages for loadvm/savevm 2018-10-19 11:15:03 +08:00
socket.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
socket.h migration: Export functions to create send channels 2018-05-15 20:24:27 +02:00
tls.c migration: add support for a "tls-authz" migration parameter 2019-03-25 18:13:47 +01:00
tls.h migration: Export tls.c functions in its own file 2017-06-01 18:49:23 +02:00
trace-events migration: add some multifd traces 2019-08-14 17:33:14 +01:00
vmstate-types.c Clean up inclusion of exec/cpu-common.h 2019-08-16 13:31:52 +02:00
vmstate.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
xbzrle.c migration: Create migration/xbzrle.h 2017-05-18 18:04:54 +02:00
xbzrle.h migration: Create migration/xbzrle.h 2017-05-18 18:04:54 +02:00