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| author | Alexey Perevalov <a.perevalov@samsung.com> | 2017-10-05 14:13:20 +0300 |
|---|---|---|
| committer | Juan Quintela <quintela@redhat.com> | 2017-10-23 18:03:41 +0200 |
| commit | f9494614898f46e59bc2243de6fb11ebbfc9cda6 (patch) | |
| tree | 4bca843ea17e88237db53722a1f7792bd527257d /migration/ram.h | |
| parent | 727b9d7e4926755e14d9ac2b09777c51cccb9b80 (diff) | |
| download | qemu-f9494614898f46e59bc2243de6fb11ebbfc9cda6.tar.gz | |
migration: add bitmap for received page
This patch adds ability to track down already received
pages, it's necessary for calculation vCPU block time in
postcopy migration feature, and for recovery after
postcopy migration failure.
Also it's necessary to solve shared memory issue in
postcopy livemigration. Information about received pages
will be transferred to the software virtual bridge
(e.g. OVS-VSWITCHD), to avoid fallocate (unmap) for
already received pages. fallocate syscall is required for
remmaped shared memory, due to remmaping itself blocks
ioctl(UFFDIO_COPY, ioctl in this case will end with EEXIT
error (struct page is exists after remmap).
Bitmap is placed into RAMBlock as another postcopy/precopy
related bitmaps.
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Alexey Perevalov <a.perevalov@samsung.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Diffstat (limited to 'migration/ram.h')
| -rw-r--r-- | migration/ram.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/migration/ram.h b/migration/ram.h index 511b3dc582..f9f7eef894 100644 --- a/migration/ram.h +++ b/migration/ram.h @@ -57,4 +57,9 @@ int ram_discard_range(const char *block_name, uint64_t start, size_t length); int ram_postcopy_incoming_init(MigrationIncomingState *mis); void ram_handle_compressed(void *host, uint8_t ch, uint64_t size); + +int ramblock_recv_bitmap_test(RAMBlock *rb, void *host_addr); +void ramblock_recv_bitmap_set(RAMBlock *rb, void *host_addr); +void ramblock_recv_bitmap_set_range(RAMBlock *rb, void *host_addr, size_t nr); + #endif |