memory: Add MemoryRegionIOMMUOps.notify_started/stopped callbacks
The IOMMU driver may change behavior depending on whether a notifier
client is present. In the case of POWER, this represents a change in
the visibility of the IOTLB, for other drivers such as intel-iommu and
future AMD-Vi emulation, notifier support is not yet enabled and this
provides the opportunity to flag that incompatibility.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Peter Xu <peterx@redhat.com>
Tested-by: Peter Xu <peterx@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
[new log & extracted from [PATCH qemu v17 12/12] spapr_iommu, vfio, memory: Notify IOMMU about starting/stopping listening]
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
diff --git a/include/exec/memory.h b/include/exec/memory.h
index e3829f7..23c7399 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -153,6 +153,10 @@
IOMMUTLBEntry (*translate)(MemoryRegion *iommu, hwaddr addr, bool is_write);
/* Returns minimum supported page size */
uint64_t (*get_min_page_size)(MemoryRegion *iommu);
+ /* Called when the first notifier is set */
+ void (*notify_started)(MemoryRegion *iommu);
+ /* Called when the last notifier is removed */
+ void (*notify_stopped)(MemoryRegion *iommu);
};
typedef struct CoalescedMemoryRange CoalescedMemoryRange;
@@ -622,9 +626,11 @@
* memory_region_unregister_iommu_notifier: unregister a notifier for
* changes to IOMMU translation entries.
*
+ * @mr: the memory region which was observed and for which notity_stopped()
+ * needs to be called
* @n: the notifier to be removed.
*/
-void memory_region_unregister_iommu_notifier(Notifier *n);
+void memory_region_unregister_iommu_notifier(MemoryRegion *mr, Notifier *n);
/**
* memory_region_name: get a memory region's name
