diff options
| -rw-r--r-- | hw/virtio/virtio-balloon.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c index bf93148486..e4cd8d566b 100644 --- a/hw/virtio/virtio-balloon.c +++ b/hw/virtio/virtio-balloon.c @@ -37,8 +37,29 @@ static void balloon_inflate_page(VirtIOBalloon *balloon, MemoryRegion *mr, hwaddr offset) { void *addr = memory_region_get_ram_ptr(mr) + offset; + RAMBlock *rb; + size_t rb_page_size; + ram_addr_t ram_offset; - qemu_madvise(addr, BALLOON_PAGE_SIZE, QEMU_MADV_DONTNEED); + /* XXX is there a better way to get to the RAMBlock than via a + * host address? */ + rb = qemu_ram_block_from_host(addr, false, &ram_offset); + rb_page_size = qemu_ram_pagesize(rb); + + /* Silently ignore hugepage RAM blocks */ + if (rb_page_size != getpagesize()) { + return; + } + + /* Silently ignore unaligned requests */ + if (ram_offset & (rb_page_size - 1)) { + return; + } + + ram_block_discard_range(rb, ram_offset, rb_page_size); + /* We ignore errors from ram_block_discard_range(), because it has + * already reported them, and failing to discard a balloon page is + * not fatal */ } static const char *balloon_stat_names[] = { |