exec: extract address_space_translate_iommu, fix page_mask corner case
This will be used to process IOMMUs in a MemoryRegionCache. This includes a small bugfix, in that the returned page_mask is now correctly -1 if the IOMMU memory region maps the entire address space directly. Previously, address_space_get_iotlb_entry would return ~TARGET_PAGE_MASK. Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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exec.c
110
exec.c
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@ -461,6 +461,70 @@ address_space_translate_internal(AddressSpaceDispatch *d, hwaddr addr, hwaddr *x
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return section;
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return section;
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}
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}
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/**
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* address_space_translate_iommu - translate an address through an IOMMU
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* memory region and then through the target address space.
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*
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* @iommu_mr: the IOMMU memory region that we start the translation from
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* @addr: the address to be translated through the MMU
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* @xlat: the translated address offset within the destination memory region.
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* It cannot be %NULL.
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* @plen_out: valid read/write length of the translated address. It
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* cannot be %NULL.
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* @page_mask_out: page mask for the translated address. This
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* should only be meaningful for IOMMU translated
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* addresses, since there may be huge pages that this bit
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* would tell. It can be %NULL if we don't care about it.
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* @is_write: whether the translation operation is for write
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* @is_mmio: whether this can be MMIO, set true if it can
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* @target_as: the address space targeted by the IOMMU
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*
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* This function is called from RCU critical section. It is the common
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* part of flatview_do_translate and address_space_translate_cached.
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*/
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static MemoryRegionSection address_space_translate_iommu(IOMMUMemoryRegion *iommu_mr,
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hwaddr *xlat,
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hwaddr *plen_out,
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hwaddr *page_mask_out,
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bool is_write,
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bool is_mmio,
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AddressSpace **target_as)
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{
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MemoryRegionSection *section;
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hwaddr page_mask = (hwaddr)-1;
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do {
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hwaddr addr = *xlat;
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IOMMUMemoryRegionClass *imrc = memory_region_get_iommu_class_nocheck(iommu_mr);
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IOMMUTLBEntry iotlb = imrc->translate(iommu_mr, addr, is_write ?
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IOMMU_WO : IOMMU_RO);
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if (!(iotlb.perm & (1 << is_write))) {
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goto unassigned;
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}
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addr = ((iotlb.translated_addr & ~iotlb.addr_mask)
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| (addr & iotlb.addr_mask));
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page_mask &= iotlb.addr_mask;
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*plen_out = MIN(*plen_out, (addr | iotlb.addr_mask) - addr + 1);
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*target_as = iotlb.target_as;
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section = address_space_translate_internal(
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address_space_to_dispatch(iotlb.target_as), addr, xlat,
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plen_out, is_mmio);
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iommu_mr = memory_region_get_iommu(section->mr);
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} while (unlikely(iommu_mr));
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if (page_mask_out) {
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*page_mask_out = page_mask;
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}
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return *section;
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unassigned:
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return (MemoryRegionSection) { .mr = &io_mem_unassigned };
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}
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/**
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/**
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* flatview_do_translate - translate an address in FlatView
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* flatview_do_translate - translate an address in FlatView
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*
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*
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@ -489,55 +553,31 @@ static MemoryRegionSection flatview_do_translate(FlatView *fv,
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bool is_mmio,
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bool is_mmio,
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AddressSpace **target_as)
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AddressSpace **target_as)
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{
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{
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IOMMUTLBEntry iotlb;
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MemoryRegionSection *section;
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MemoryRegionSection *section;
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IOMMUMemoryRegion *iommu_mr;
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IOMMUMemoryRegion *iommu_mr;
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IOMMUMemoryRegionClass *imrc;
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hwaddr page_mask = (hwaddr)(-1);
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hwaddr plen = (hwaddr)(-1);
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hwaddr plen = (hwaddr)(-1);
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if (!plen_out) {
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if (!plen_out) {
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plen_out = &plen;
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plen_out = &plen;
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}
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}
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for (;;) {
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section = address_space_translate_internal(
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section = address_space_translate_internal(
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flatview_to_dispatch(fv), addr, xlat,
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flatview_to_dispatch(fv), addr, xlat,
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plen_out, is_mmio);
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plen_out, is_mmio);
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iommu_mr = memory_region_get_iommu(section->mr);
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iommu_mr = memory_region_get_iommu(section->mr);
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if (!iommu_mr) {
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if (unlikely(iommu_mr)) {
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break;
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return address_space_translate_iommu(iommu_mr, xlat,
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}
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plen_out, page_mask_out,
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imrc = memory_region_get_iommu_class_nocheck(iommu_mr);
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is_write, is_mmio,
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target_as);
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addr = *xlat;
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iotlb = imrc->translate(iommu_mr, addr, is_write ?
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IOMMU_WO : IOMMU_RO);
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if (!(iotlb.perm & (1 << is_write))) {
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goto translate_fail;
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}
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addr = ((iotlb.translated_addr & ~iotlb.addr_mask)
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| (addr & iotlb.addr_mask));
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page_mask &= iotlb.addr_mask;
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*plen_out = MIN(*plen_out, (addr | iotlb.addr_mask) - addr + 1);
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fv = address_space_to_flatview(iotlb.target_as);
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*target_as = iotlb.target_as;
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}
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}
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if (page_mask_out) {
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if (page_mask_out) {
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if (page_mask == (hwaddr)(-1)) {
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/* Not behind an IOMMU, use default page size. */
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/* Not behind an IOMMU, use default page size. */
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*page_mask_out = ~TARGET_PAGE_MASK;
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page_mask = ~TARGET_PAGE_MASK;
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}
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*page_mask_out = page_mask;
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}
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}
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return *section;
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return *section;
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translate_fail:
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return (MemoryRegionSection) { .mr = &io_mem_unassigned };
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}
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}
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/* Called from RCU critical section */
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/* Called from RCU critical section */
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