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memory: Add reporting of supported page sizes

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Every IOMMU has some granularity which MemoryRegionIOMMUOps::translate
uses when translating, however this information is not available outside
the translate context for various checks.

This adds a get_min_page_size callback to MemoryRegionIOMMUOps and
a wrapper for it so IOMMU users (such as VFIO) can know the minimum
actual page size supported by an IOMMU.

As IOMMU MR represents a guest IOMMU, this uses TARGET_PAGE_SIZE
as fallback.

This removes vfio_container_granularity() and uses new helper in
memory_region_iommu_replay() when replaying IOMMU mappings on added
IOMMU memory region.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
[dwg: Removed an unnecessary calculation]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Alexey Kardashevskiy 2016-06-21 11:14:01 +10:00 • committed by David Gibson
parent f0278900d3
commit f682e9c244
4 changed files with 37 additions and 15 deletions
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9
hw/vfio/common.c
View file

@ -321,11 +321,6 @@ out:
rcu_read_unlock();
}
static hwaddr vfio_container_granularity(VFIOContainer *container)
{
return (hwaddr)1 << ctz64(container->iova_pgsizes);
}
static void vfio_listener_region_add(MemoryListener *listener,
MemoryRegionSection *section)
{
@ -392,9 +387,7 @@ static void vfio_listener_region_add(MemoryListener *listener,
QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next);
memory_region_register_iommu_notifier(giommu->iommu, &giommu->n);
memory_region_iommu_replay(giommu->iommu, &giommu->n,
vfio_container_granularity(container),
false);
memory_region_iommu_replay(giommu->iommu, &giommu->n, false);
return;
}