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x86/amd-iommu: Introduce increase_address_space function
This function will be used to increase the address space size of a protection domain. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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2 changed files with 31 additions and 0 deletions
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@ -160,6 +160,10 @@
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((1ULL << PM_LEVEL_SHIFT((x))) - 1): \
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(0xffffffffffffffffULL))
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#define PM_LEVEL_INDEX(x, a) (((a) >> PM_LEVEL_SHIFT((x))) & 0x1ffULL)
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#define PM_LEVEL_ENC(x) (((x) << 9) & 0xe00ULL)
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#define PM_LEVEL_PDE(x, a) ((a) | PM_LEVEL_ENC((x)) | \
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IOMMU_PTE_P | IOMMU_PTE_IR | IOMMU_PTE_IW)
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#define IOMMU_PTE_L2_INDEX(address) (((address) >> 30) & 0x1ffULL)
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#define IOMMU_PTE_L1_INDEX(address) (((address) >> 21) & 0x1ffULL)
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@ -1324,6 +1324,33 @@ static void update_domain(struct protection_domain *domain)
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domain->updated = false;
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}
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/*
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* This function is used to add another level to an IO page table. Adding
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* another level increases the size of the address space by 9 bits to a size up
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* to 64 bits.
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*/
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static bool increase_address_space(struct protection_domain *domain,
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gfp_t gfp)
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{
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u64 *pte;
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if (domain->mode == PAGE_MODE_6_LEVEL)
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/* address space already 64 bit large */
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return false;
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pte = (void *)get_zeroed_page(gfp);
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if (!pte)
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return false;
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*pte = PM_LEVEL_PDE(domain->mode,
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virt_to_phys(domain->pt_root));
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domain->pt_root = pte;
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domain->mode += 1;
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domain->updated = true;
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return true;
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}
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/*
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* If the pte_page is not yet allocated this function is called
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*/
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