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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 /include/exec | |
| parent | 727b9d7e4926755e14d9ac2b09777c51cccb9b80 (diff) | |
| download | qemu-f9494614898f46e59bc2243de6fb11ebbfc9cda6.zip qemu-f9494614898f46e59bc2243de6fb11ebbfc9cda6.tar.gz qemu-f9494614898f46e59bc2243de6fb11ebbfc9cda6.tar.bz2 | |
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 'include/exec')
| -rw-r--r-- | include/exec/ram_addr.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h index d017639..6cbc02a 100644 --- a/include/exec/ram_addr.h +++ b/include/exec/ram_addr.h @@ -47,6 +47,8 @@ struct RAMBlock { * of the postcopy phase */ unsigned long *unsentmap; + /* bitmap of already received pages in postcopy */ + unsigned long *receivedmap; }; static inline bool offset_in_ramblock(RAMBlock *b, ram_addr_t offset) @@ -60,6 +62,14 @@ static inline void *ramblock_ptr(RAMBlock *block, ram_addr_t offset) return (char *)block->host + offset; } +static inline unsigned long int ramblock_recv_bitmap_offset(void *host_addr, + RAMBlock *rb) +{ + uint64_t host_addr_offset = + (uint64_t)(uintptr_t)(host_addr - (void *)rb->host); + return host_addr_offset >> TARGET_PAGE_BITS; +} + long qemu_getrampagesize(void); unsigned long last_ram_page(void); RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr, |