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    Subject[PATCH 07/14] x86/amd-iommu: Introduce increase_address_space function
    Date
    This function will be used to increase the address space
    size of a protection domain.

    Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    ---
    arch/x86/include/asm/amd_iommu_types.h | 4 ++++
    arch/x86/kernel/amd_iommu.c | 27 +++++++++++++++++++++++++++
    2 files changed, 31 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h
    index 97f3d09..1b4b3d6 100644
    --- a/arch/x86/include/asm/amd_iommu_types.h
    +++ b/arch/x86/include/asm/amd_iommu_types.h
    @@ -160,6 +160,10 @@
    ((1ULL << PM_LEVEL_SHIFT((x))) - 1): \
    (0xffffffffffffffffULL))
    #define PM_LEVEL_INDEX(x, a) (((a) >> PM_LEVEL_SHIFT((x))) & 0x1ffULL)
    +#define PM_LEVEL_ENC(x) (((x) << 9) & 0xe00ULL)
    +#define PM_LEVEL_PDE(x, a) ((a) | PM_LEVEL_ENC((x)) | \
    + IOMMU_PTE_P | IOMMU_PTE_IR | IOMMU_PTE_IW)
    +

    #define IOMMU_PTE_L2_INDEX(address) (((address) >> 30) & 0x1ffULL)
    #define IOMMU_PTE_L1_INDEX(address) (((address) >> 21) & 0x1ffULL)
    diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
    index 5eab6a8..fc97b51 100644
    --- a/arch/x86/kernel/amd_iommu.c
    +++ b/arch/x86/kernel/amd_iommu.c
    @@ -1325,6 +1325,33 @@ static void update_domain(struct protection_domain *domain)
    }

    /*
    + * This function is used to add another level to an IO page table. Adding
    + * another level increases the size of the address space by 9 bits to a size up
    + * to 64 bits.
    + */
    +static bool increase_address_space(struct protection_domain *domain,
    + gfp_t gfp)
    +{
    + u64 *pte;
    +
    + if (domain->mode == PAGE_MODE_6_LEVEL)
    + /* address space already 64 bit large */
    + return false;
    +
    + pte = (void *)get_zeroed_page(gfp);
    + if (!pte)
    + return false;
    +
    + *pte = PM_LEVEL_PDE(domain->mode,
    + virt_to_phys(domain->pt_root));
    + domain->pt_root = pte;
    + domain->mode += 1;
    + domain->updated = true;
    +
    + return true;
    +}
    +
    +/*
    * If the pte_page is not yet allocated this function is called
    */
    static u64* alloc_pte(struct protection_domain *dom,
    --
    1.6.3.3



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