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memory: synchronize dirty bitmap before unmapping a range 

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>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Avi Kivity 2011-07-31 22:47:58 +03:00 committed by Anthony Liguori
parent 9510a48638
commit 39b796f28c
1 changed files with 4 additions and 0 deletions
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4
memory.c
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@ -245,6 +245,10 @@ static void as_memory_range_add(AddressSpace *as, FlatRange *fr)
static void as_memory_range_del(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, cpu_register_physical_memory(fr->addr.start, fr->addr.size,
IO_MEM_UNASSIGNED); IO_MEM_UNASSIGNED);
} }