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-rw-r--r--include/exec/memory.h1
-rw-r--r--memory.c7
2 files changed, 8 insertions, 0 deletions
diff --git a/include/exec/memory.h b/include/exec/memory.h
index 139471500f..94d20eae05 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -180,6 +180,7 @@ struct MemoryRegion {
bool warning_printed; /* For reservations */
bool flush_coalesced_mmio;
bool global_locking;
+ uint8_t vga_logging_count;
MemoryRegion *alias;
hwaddr alias_offset;
int32_t priority;
diff --git a/memory.c b/memory.c
index 0acebb1f22..5e5f32540e 100644
--- a/memory.c
+++ b/memory.c
@@ -1433,8 +1433,15 @@ void memory_region_notify_iommu(MemoryRegion *mr,
void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
{
uint8_t mask = 1 << client;
+ uint8_t old_logging;
assert(client == DIRTY_MEMORY_VGA);
+ old_logging = mr->vga_logging_count;
+ mr->vga_logging_count += log ? 1 : -1;
+ if (!!old_logging == !!mr->vga_logging_count) {
+ return;
+ }
+
memory_region_transaction_begin();
mr->dirty_log_mask = (mr->dirty_log_mask & ~mask) | (log * mask);
memory_region_update_pending |= mr->enabled;