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memory: Add MemoryRegionIOMMUOps.notify_started/stopped callbacks

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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.

Backports commit d22d8956b185c002b50a4d0883aff61f857347ef from qemu
This commit is contained in:
Alexey Kardashevskiy 2018-02-25 00:22:53 -05:00 committed by Lioncash
parent c14d8226ab
commit 7187d77cfa
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1 changed files with 4 additions and 0 deletions
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qemu/include/exec/memory.h
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@ -147,6 +147,10 @@ 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);
};
struct MemoryRegion {