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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.

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>
This commit is contained in:
Alexey Kardashevskiy 2016-06-30 13:00:23 -06:00 • committed by Alex Williamson
parent e37dac06dc
commit d22d8956b1
3 changed files with 19 additions and 4 deletions
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10
memory.c
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@ -1499,6 +1499,10 @@ bool memory_region_is_logging(MemoryRegion *mr, uint8_t client)
void memory_region_register_iommu_notifier(MemoryRegion *mr, Notifier *n)
{
if (mr->iommu_ops->notify_started &&
QLIST_EMPTY(&mr->iommu_notify.notifiers)) {
mr->iommu_ops->notify_started(mr);
}
notifier_list_add(&mr->iommu_notify, n);
}
@ -1532,9 +1536,13 @@ void memory_region_iommu_replay(MemoryRegion *mr, Notifier *n, bool is_write)
}
}
void memory_region_unregister_iommu_notifier(Notifier *n)
void memory_region_unregister_iommu_notifier(MemoryRegion *mr, Notifier *n)
{
notifier_remove(n);
if (mr->iommu_ops->notify_stopped &&
QLIST_EMPTY(&mr->iommu_notify.notifiers)) {
mr->iommu_ops->notify_stopped(mr);
}
}
void memory_region_notify_iommu(MemoryRegion *mr,