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    Subject[PATCH 08/10] x86/pci: make sure _PAGE_IOMAP it set on pci mappings
    Date
    From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

    When mapping pci space via /sys or /proc, make sure we're really
    doing a hardware mapping by setting _PAGE_IOMAP.

    [ Impact: bugfix; make PCI mappings map the right pages ]
    Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
    Reviewed-by: "H. Peter Anvin" <hpa@zytor.com>
    Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
    ---
    arch/x86/pci/i386.c | 3 +++
    1 files changed, 3 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
    index a85bef2..88a1080 100644
    --- a/arch/x86/pci/i386.c
    +++ b/arch/x86/pci/i386.c
    @@ -278,6 +278,9 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
    return -EINVAL;

    prot = pgprot_val(vma->vm_page_prot);
    +
    + prot |= _PAGE_IOMAP; /* creating a mapping for IO */
    +
    if (pat_enabled && write_combine)
    prot |= _PAGE_CACHE_WC;
    else if (pat_enabled || boot_cpu_data.x86 > 3)
    --
    1.6.0.6


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