[PATCH] memory: synchronize dirty bitmap before unmapping a range

Avi Kivity
2011-07-31T19:47:58Z

When a range is being unmapped, ask accelerators (e.g. kvm) to synchronize the
dirty bitmap to avoid losing information forever.

Fixes grub2 screen update.

Signed-off-by: Avi Kivity <avi@redhat.com>
---

Please apply before the PCI batch to avoid bisectability issues (and don't
pull, since that removes ordering).

memory.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/memory.c b/memory.c
index 5c6e63d..5f20320 100644
--- a/memory.c
+++ b/memory.c
@@ -245,6 +245,10 @@ static void as_memory_range_add(AddressSpace *as, FlatRange *fr)

static void as_memory_range_del(AddressSpace *as, FlatRange *fr)
{
+ if (fr->dirty_log_mask) {
+ cpu_physical_sync_dirty_bitmap(fr->addr.start,
+ fr->addr.start + fr->addr.size);
+ }
cpu_register_physical_memory(fr->addr.start, fr->addr.size,
IO_MEM_UNASSIGNED);
}
--
1.7.5.3