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iommu: Add IOMMU index argument to notifier APIs

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Add support for multiple IOMMU indexes to the IOMMU notifier APIs.
When initializing a notifier with iommu_notifier_init(), the caller
must pass the IOMMU index that it is interested in. When a change
happens, the IOMMU implementation must pass
memory_region_notify_iommu() the IOMMU index that has changed and
that notifiers must be called for.

IOMMUs which support only a single index don't need to change.
Callers which only really support working with IOMMUs with a single
index can use the result of passing MEMTXATTRS_UNSPECIFIED to
memory_region_iommu_attrs_to_index().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20180604152941.20374-3-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2018-06-15 14:57:16 +01:00
parent 21f402093c
commit cb1efcf462
7 changed files with 30 additions and 10 deletions
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7
hw/virtio/vhost.c
View file

@ -662,6 +662,8 @@ static void vhost_iommu_region_add(MemoryListener *listener,
iommu_listener);
struct vhost_iommu *iommu;
Int128 end;
int iommu_idx;
IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
if (!memory_region_is_iommu(section->mr)) {
return;
@ -671,10 +673,13 @@ static void vhost_iommu_region_add(MemoryListener *listener,
end = int128_add(int128_make64(section->offset_within_region),
section->size);
end = int128_sub(end, int128_one());
iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr,
MEMTXATTRS_UNSPECIFIED);
iommu_notifier_init(&iommu->n, vhost_iommu_unmap_notify,
IOMMU_NOTIFIER_UNMAP,
section->offset_within_region,
int128_get64(end));
int128_get64(end),
iommu_idx);
iommu->mr = section->mr;
iommu->iommu_offset = section->offset_within_address_space -
section->offset_within_region;