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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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16
memory.c
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@ -1502,12 +1502,22 @@ void memory_region_register_iommu_notifier(MemoryRegion *mr, Notifier *n)
notifier_list_add(&mr->iommu_notify, n);
}
void memory_region_iommu_replay(MemoryRegion *mr, Notifier *n,
hwaddr granularity, bool is_write)
uint64_t memory_region_iommu_get_min_page_size(MemoryRegion *mr)
{
hwaddr addr;
assert(memory_region_is_iommu(mr));
if (mr->iommu_ops && mr->iommu_ops->get_min_page_size) {
return mr->iommu_ops->get_min_page_size(mr);
}
return TARGET_PAGE_SIZE;
}
void memory_region_iommu_replay(MemoryRegion *mr, Notifier *n, bool is_write)
{
hwaddr addr, granularity;
IOMMUTLBEntry iotlb;
granularity = memory_region_iommu_get_min_page_size(mr);
for (addr = 0; addr < memory_region_size(mr); addr += granularity) {
iotlb = mr->iommu_ops->translate(mr, addr, is_write);
if (iotlb.perm != IOMMU_NONE) {