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| author | Jagannathan Raman <jag.raman@oracle.com> | 2021-01-29 11:46:04 -0500 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2021-02-09 20:53:56 +0000 |
| commit | 44a4ff31c01082ffce08ec3b9a87a4fdf15919d5 (patch) | |
| tree | 12d221ae0ba47bf3a853248b3b42bae208a07c6b /util/mmap-alloc.c | |
| parent | 639090d85057e7e8251e2509fa136f1a2384f131 (diff) | |
memory: alloc RAM from file at offset
Allow RAM MemoryRegion to be created from an offset in a file, instead
of allocating at offset of 0 by default. This is needed to synchronize
RAM between QEMU & remote process.
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 609996697ad8617e3b01df38accc5c208c24d74e.1611938319.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'util/mmap-alloc.c')
| -rw-r--r-- | util/mmap-alloc.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c index 890fda6a35..e6fa8b598b 100644 --- a/util/mmap-alloc.c +++ b/util/mmap-alloc.c @@ -87,7 +87,8 @@ void *qemu_ram_mmap(int fd, size_t align, bool readonly, bool shared, - bool is_pmem) + bool is_pmem, + off_t map_offset) { int prot; int flags; @@ -150,7 +151,8 @@ void *qemu_ram_mmap(int fd, prot = PROT_READ | (readonly ? 0 : PROT_WRITE); - ptr = mmap(guardptr + offset, size, prot, flags | map_sync_flags, fd, 0); + ptr = mmap(guardptr + offset, size, prot, + flags | map_sync_flags, fd, map_offset); if (ptr == MAP_FAILED && map_sync_flags) { if (errno == ENOTSUP) { @@ -174,7 +176,7 @@ void *qemu_ram_mmap(int fd, * if map failed with MAP_SHARED_VALIDATE | MAP_SYNC, * we will remove these flags to handle compatibility. */ - ptr = mmap(guardptr + offset, size, prot, flags, fd, 0); + ptr = mmap(guardptr + offset, size, prot, flags, fd, map_offset); } if (ptr == MAP_FAILED) { |