vhost: Fix mmap size calculation
I had a bug where a requested size of 1G was resulting in
an aligned size of '1G + 2M', resulting in an OOM error.
Previous code was adding one huge page size
when memory is already aligned.
@@ -303,7 +303,7 @@ unmap_all_mem_regions (vhost_user_intf_t * vui)
ssize_t map_sz = (vui->regions[i].memory_size +
vui->regions[i].mmap_offset +
- page_sz) & ~(page_sz - 1);
+ page_sz - 1) & ~(page_sz - 1);
r =
munmap (vui->region_mmap_addr[i] - vui->regions[i].mmap_offset,
@@ -917,7 +917,7 @@ vhost_user_socket_read (unix_file_t * uf)
/* align size to 2M page */
ssize_t map_sz = (vui->regions[i].memory_size +
vui->regions[i].mmap_offset +
- page_sz) & ~(page_sz - 1);
+ page_sz - 1) & ~(page_sz - 1);
vui->region_mmap_addr[i] = mmap (0, map_sz, PROT_READ | PROT_WRITE,
MAP_SHARED, fds[i], 0);
@@ -1168,7 +1168,7 @@ vhost_user_socket_read (unix_file_t * uf)
/* align size to 2M page */
long page_sz = get_huge_page_size (fd);
ssize_t map_sz =
- (msg.log.size + msg.log.offset + page_sz) & ~(page_sz - 1);
+ (msg.log.size + msg.log.offset + page_sz - 1) & ~(page_sz - 1);
vui->log_base_addr = mmap (0, map_sz, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0);
