diff options
| -rw-r--r-- | include/exec/memory.h | 13 | ||||
| -rw-r--r-- | memory.c | 20 |
2 files changed, 33 insertions, 0 deletions
diff --git a/include/exec/memory.h b/include/exec/memory.h index 5baaf48234..0f07159bb4 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -583,6 +583,19 @@ void memory_region_notify_iommu(MemoryRegion *mr, void memory_region_register_iommu_notifier(MemoryRegion *mr, Notifier *n); /** + * memory_region_iommu_replay: replay existing IOMMU translations to + * a notifier + * + * @mr: the memory region to observe + * @n: the notifier to which to replay iommu mappings + * @granularity: Minimum page granularity to replay notifications for + * @is_write: Whether to treat the replay as a translate "write" + * through the iommu + */ +void memory_region_iommu_replay(MemoryRegion *mr, Notifier *n, + hwaddr granularity, bool is_write); + +/** * memory_region_unregister_iommu_notifier: unregister a notifier for * changes to IOMMU translation entries. * diff --git a/memory.c b/memory.c index ef87363067..1b03d2251c 100644 --- a/memory.c +++ b/memory.c @@ -1403,6 +1403,26 @@ void memory_region_register_iommu_notifier(MemoryRegion *mr, Notifier *n) notifier_list_add(&mr->iommu_notify, n); } +void memory_region_iommu_replay(MemoryRegion *mr, Notifier *n, + hwaddr granularity, bool is_write) +{ + hwaddr addr; + IOMMUTLBEntry iotlb; + + for (addr = 0; addr < memory_region_size(mr); addr += granularity) { + iotlb = mr->iommu_ops->translate(mr, addr, is_write); + if (iotlb.perm != IOMMU_NONE) { + n->notify(n, &iotlb); + } + + /* if (2^64 - MR size) < granularity, it's possible to get an + * infinite loop here. This should catch such a wraparound */ + if ((addr + granularity) < addr) { + break; + } + } +} + void memory_region_unregister_iommu_notifier(Notifier *n) { notifier_remove(n); |