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| author | Zenghui Yu <yuzenghui@huawei.com> | 2020-11-16 21:22:10 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-11-16 13:22:25 -0500 |
| commit | 1370d61ae3c9934861d2349349447605202f04e9 (patch) | |
| tree | b3806f1b4dd09986a734816267858bc6feb18d9b | |
| parent | 42ccce19818e4e8fb55026f50b20d533cccc48f6 (diff) | |
| download | qemu-1370d61ae3c9934861d2349349447605202f04e9.zip qemu-1370d61ae3c9934861d2349349447605202f04e9.tar.gz qemu-1370d61ae3c9934861d2349349447605202f04e9.tar.bz2 | |
memory: Skip dirty tracking for un-migratable memory regions
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>
Message-Id: <20201116132210.1730-1-yuzenghui@huawei.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | softmmu/memory.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/softmmu/memory.c b/softmmu/memory.c index 71951fe..aa393f1 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; |