It makes no sense to track dirty pages for those un-migratable memory
regions (e.g., Memory BAR region of the VFIO PCI device) and doing so
will potentially lead to some unpleasant issues during migration [1].
Skip dirty tracking for those regions by evaluating if the region is
migratable before setting dirty_log_mask (DIRTY_MEMORY_MIGRATION).
[1] https://lists.gnu.org/archive/html/qemu-devel/2020-11/msg03757.html
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
---
softmmu/memory.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/softmmu/memory.c b/softmmu/memory.c
index 71951fe4dc..aa393f1bb0 100644
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -1806,7 +1806,10 @@ bool memory_region_is_ram_device(MemoryRegion *mr)
uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr)
{
uint8_t mask = mr->dirty_log_mask;
- if (global_dirty_log && (mr->ram_block || memory_region_is_iommu(mr))) {
+ RAMBlock *rb = mr->ram_block;
+
+ if (global_dirty_log && ((rb && qemu_ram_is_migratable(rb)) ||
+ memory_region_is_iommu(mr))) {
mask |= (1 << DIRTY_MEMORY_MIGRATION);
}
return mask;