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memory/iommu: QOM'fy IOMMU MemoryRegion

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This defines new QOM object - IOMMUMemoryRegion - with MemoryRegion
as a parent.

This moves IOMMU-related fields from MR to IOMMU MR. However to avoid
dymanic QOM casting in fast path (address_space_translate, etc),
this adds an @is_iommu boolean flag to MR and provides new helper to
do simple cast to IOMMU MR - memory_region_get_iommu. The flag
is set in the instance init callback. This defines
memory_region_is_iommu as memory_region_get_iommu()!=NULL.

This switches MemoryRegion to IOMMUMemoryRegion in most places except
the ones where MemoryRegion may be an alias.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <20170711035620.4232-2-aik@ozlabs.ru>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alexey Kardashevskiy 2017-07-11 13:56:19 +10:00 • committed by Paolo Bonzini
parent 98fab4c163
commit 3df9d74806
20 changed files with 170 additions and 109 deletions
Download patch file Download diff file Expand all files Collapse all files

12
exec.c
View file

@ -480,19 +480,19 @@ static MemoryRegionSection address_space_do_translate(AddressSpace *as,
{
IOMMUTLBEntry iotlb;
MemoryRegionSection *section;
MemoryRegion *mr;
IOMMUMemoryRegion *iommu_mr;
for (;;) {
AddressSpaceDispatch *d = atomic_rcu_read(&as->dispatch);
section = address_space_translate_internal(d, addr, &addr, plen, is_mmio);
mr = section->mr;
if (!mr->iommu_ops) {
iommu_mr = memory_region_get_iommu(section->mr);
if (!iommu_mr) {
break;
}
iotlb = mr->iommu_ops->translate(mr, addr, is_write ?
IOMMU_WO : IOMMU_RO);
iotlb = iommu_mr->iommu_ops->translate(iommu_mr, addr, is_write ?
IOMMU_WO : IOMMU_RO);
addr = ((iotlb.translated_addr & ~iotlb.addr_mask)
| (addr & iotlb.addr_mask));
*plen = MIN(*plen, (addr | iotlb.addr_mask) - addr + 1);
@ -588,7 +588,7 @@ address_space_translate_for_iotlb(CPUState *cpu, int asidx, hwaddr addr,
section = address_space_translate_internal(d, addr, xlat, plen, false);
assert(!section->mr->iommu_ops);
assert(!memory_region_is_iommu(section->mr));
return section;
}
#endif