memory: differentiate memory_region_is_logging and memory_region_get_dirty_log_mask

For now memory regions only track DIRTY_MEMORY_VGA individually, but
this will change soon.  To support this, split memory_region_is_logging
in two functions: one that returns a given bit from dirty_log_mask,
and one that returns the entire mask.  memory_region_is_logging gets an
extra parameter so that the compiler flags misuse.

While VGA-specific users (including the Xen listener!) will want to keep
checking that bit, KVM and vhost check for "any bit except migration"
(because migration is handled via the global start/stop listener
callbacks).

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/memory.c b/memory.c
index a8f8599079..72e33e853b 100644
--- a/memory.c
+++ b/memory.c
@@ -1389,11 +1389,16 @@ bool memory_region_is_skip_dump(MemoryRegion *mr)
     return mr->skip_dump;
 }
 
-bool memory_region_is_logging(MemoryRegion *mr)
+uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr)
 {
     return mr->dirty_log_mask;
 }
 
+bool memory_region_is_logging(MemoryRegion *mr, uint8_t client)
+{
+    return memory_region_get_dirty_log_mask(mr) & (1 << client);
+}
+
 bool memory_region_is_rom(MemoryRegion *mr)
 {
     return mr->ram && mr->readonly;