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Stefan Hajnoczi dd577a26ff block/file-posix: implement bdrv_co_invalidate_cache() on Linux 
On Linux posix_fadvise(POSIX_FADV_DONTNEED) invalidates pages*.  Use
this to drop page cache on the destination host during shared storage
migration.  This way the destination host will read the latest copy of
the data and will not use stale data from the page cache.

The flow is as follows:

1. Source host writes out all dirty pages and inactivates drives.
2. QEMU_VM_EOF is sent on migration stream.
3. Destination host invalidates caches before accessing drives.

This patch enables live migration even with -drive cache.direct=off.

* Terms and conditions may apply, please see patch for details.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20180427162312.18583-2-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
 		2018-05-11 16:43:05 +01:00
..
Makefile.objs block: x-blockdev-create QMP command 2018-03-09 15:17:47 +01:00
accounting.c block/accounting: introduce latency histogram 2018-03-19 14:58:37 -05:00
backup.c blockjobs: ensure abort is called for cancelled jobs 2018-03-19 12:01:24 +01:00
blkdebug.c qobject: Modify qobject_ref() to return obj 2018-05-04 08:27:53 +02:00
blkreplay.c block/blkreplay: Remove protocol-related fields 2018-03-26 12:16:00 +02:00
blkverify.c qobject: Modify qobject_ref() to return obj 2018-05-04 08:27:53 +02:00
block-backend.c block: let blk_add/remove_aio_context_notifier() tolerate BDS changes 2018-03-13 15:38:55 -05:00
bochs.c block: Deprecate bdrv_set_read_only() and users 2017-11-17 13:35:59 +01:00
cloop.c block: Deprecate bdrv_set_read_only() and users 2017-11-17 13:35:59 +01:00
commit.c commit/stream: Reset delay_ns 2018-04-10 16:33:47 +02:00
create.c block: x-blockdev-create QMP command 2018-03-09 15:17:47 +01:00
crypto.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
crypto.h qcow: convert QCow to use QCryptoBlock for encryption 2017-07-11 17:44:56 +02:00
curl.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
dirty-bitmap.c dirty-bitmap: add locked state 2018-03-13 17:05:00 -04:00
dmg-bz2.c dmg: Move libbz2 code to dmg-bz2.so 2016-10-07 14:14:06 +02:00
dmg.c block: Deprecate bdrv_set_read_only() and users 2017-11-17 13:35:59 +01:00
dmg.h block: remove "qemu/osdep.h" from header file 2017-12-18 17:07:02 +03:00
file-posix.c block/file-posix: implement bdrv_co_invalidate_cache() on Linux 2018-05-11 16:43:05 +01:00
file-win32.c file-win32: Support .bdrv_co_create 2018-03-09 15:17:47 +01:00
gluster.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
io.c coroutine: avoid co_queue_wakeup recursion 2018-03-27 13:05:28 +01:00
iscsi-opts.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
iscsi.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
linux-aio.c block: explicitly acquire aiocontext in aio callbacks that need it 2017-02-21 11:39:39 +00:00
mirror.c block/mirror: Make cancel always cancel pre-READY 2018-05-08 10:47:27 -04:00
nbd-client.c nbd/client: Relax handling of large NBD_CMD_BLOCK_STATUS reply 2018-05-04 08:23:39 -05:00
nbd-client.h nbd: BLOCK_STATUS for standard get_block_status function: client part 2018-03-13 15:43:48 -05:00
nbd.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
nfs.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
null.c qobject: Modify qobject_ref() to return obj 2018-05-04 08:27:53 +02:00
nvme.c qobject: Modify qobject_ref() to return obj 2018-05-04 08:27:53 +02:00
parallels.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
parallels.h Clean up includes 2018-02-09 05:05:11 +01:00
qapi.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
qcow.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
qcow2-bitmap.c qcow2-bitmap: add qcow2_reopen_bitmaps_rw_hint() 2018-03-26 21:17:24 +02:00
qcow2-cache.c qcow2: Allow configuring the L2 slice size 2018-02-13 17:00:00 +01:00
qcow2-cluster.c qcow2: Check L1 table parameters in qcow2_expand_zero_clusters() 2018-03-09 15:17:47 +01:00
qcow2-refcount.c qcow2: Reset free_cluster_index when allocating a new refcount block 2018-03-26 12:16:00 +02:00
qcow2-snapshot.c qcow2: Check snapshot L1 table in qcow2_snapshot_delete() 2018-03-09 15:17:47 +01:00
qcow2.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
qcow2.h qcow2: try load bitmaps only once 2018-04-16 13:35:32 +02:00
qed-check.c block: convert bdrv_check callback to coroutine_fn 2018-03-09 15:17:47 +01:00
qed-cluster.c qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
qed-l2-cache.c qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
qed-table.c block: convert bdrv_check callback to coroutine_fn 2018-03-09 15:17:47 +01:00
qed.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
qed.h qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
quorum.c qobject: Modify qobject_ref() to return obj 2018-05-04 08:27:53 +02:00
raw-format.c block: rename .bdrv_create() to .bdrv_co_create_opts() 2018-03-02 18:39:07 +01:00
rbd.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
replication.c block/replication: Remove protocol_name field 2018-03-26 12:16:00 +02:00
sheepdog.c sheepdog: Fix sd_co_create_opts() memory leaks 2018-05-08 10:47:27 -04:00
snapshot.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
ssh.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
stream.c commit/stream: Reset delay_ns 2018-04-10 16:33:47 +02:00
throttle-groups.c Include less of the generated modular QAPI headers 2018-03-02 13:45:50 -06:00
throttle.c block/throttle: Remove protocol-related fields 2018-03-26 12:16:00 +02:00
trace-events blockjobs: add block-job-finalize 2018-03-19 12:01:24 +01:00
vdi.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
vhdx-endian.c vhdx: Use QEMU UUID API 2016-09-23 11:42:52 +08:00
vhdx-log.c vhdx: use QEMU_ALIGN_DOWN 2017-08-31 12:29:07 +02:00
vhdx.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
vhdx.h block: vhdx - update PAYLOAD_BLOCK_UNMAPPED value to match 1.00 spec 2014-12-12 15:42:22 +00:00
vmdk.c vmdk: return ERROR when cluster sector is larger than vmdk limitation 2018-03-26 21:17:24 +02:00
vpc.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
vvfat.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
vxhs.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
win32-aio.c block: explicitly acquire aiocontext in aio callbacks that need it 2017-02-21 11:39:39 +00:00
write-threshold.c Include less of the generated modular QAPI headers 2018-03-02 13:45:50 -06:00