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xen/mmu: Set _PAGE_IOMAP if PFN is an identity PFN.
If we find that the PFN is within the P2M as an identity PFN make sure to tack on the _PAGE_IOMAP flag. Reviewed-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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@ -416,8 +416,12 @@ static pteval_t pte_pfn_to_mfn(pteval_t val)
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if (val & _PAGE_PRESENT) {
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unsigned long pfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
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pteval_t flags = val & PTE_FLAGS_MASK;
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unsigned long mfn = pfn_to_mfn(pfn);
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unsigned long mfn;
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if (!xen_feature(XENFEAT_auto_translated_physmap))
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mfn = get_phys_to_machine(pfn);
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else
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mfn = pfn;
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/*
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* If there's no mfn for the pfn, then just create an
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* empty non-present pte. Unfortunately this loses
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@ -427,8 +431,18 @@ static pteval_t pte_pfn_to_mfn(pteval_t val)
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if (unlikely(mfn == INVALID_P2M_ENTRY)) {
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mfn = 0;
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flags = 0;
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} else {
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/*
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* Paramount to do this test _after_ the
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* INVALID_P2M_ENTRY as INVALID_P2M_ENTRY &
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* IDENTITY_FRAME_BIT resolves to true.
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*/
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mfn &= ~FOREIGN_FRAME_BIT;
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if (mfn & IDENTITY_FRAME_BIT) {
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mfn &= ~IDENTITY_FRAME_BIT;
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flags |= _PAGE_IOMAP;
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}
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}
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val = ((pteval_t)mfn << PAGE_SHIFT) | flags;
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}
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