From d22d8956b185c002b50a4d0883aff61f857347ef Mon Sep 17 00:00:00 2001 From: Alexey Kardashevskiy Date: Thu, 30 Jun 2016 13:00:23 -0600 Subject: 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 Reviewed-by: David Gibson Reviewed-by: Peter Xu Tested-by: Peter Xu Acked-by: Paolo Bonzini [new log & extracted from [PATCH qemu v17 12/12] spapr_iommu, vfio, memory: Notify IOMMU about starting/stopping listening] Signed-off-by: Alex Williamson --- include/exec/memory.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'include/exec/memory.h') diff --git a/include/exec/memory.h b/include/exec/memory.h index e3829f797a..23c7399131 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -153,6 +153,10 @@ struct MemoryRegionIOMMUOps { 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 @@ void memory_region_iommu_replay(MemoryRegion *mr, Notifier *n, bool is_write); * 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 -- cgit v1.2.3