[Xen-devel] [PATCH 13/23] x86/PCI: make sure _PAGE_IOMAP it set on pci mappings

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

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@xxxxxxxxxx>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Reviewed-by: "H. Peter Anvin" <hpa@xxxxxxxxx>
Reviewed-by: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
---
 arch/x86/pci/i386.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 5525309..8379c2c 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -311,6 +311,8 @@ int pci_mmap_page_range(struct pci_dev *dev, struct 
vm_area_struct *vma,
                 */
                prot |= _PAGE_CACHE_UC_MINUS;
 
+       prot |= _PAGE_IOMAP;    /* creating a mapping for IO */
+
        vma->vm_page_prot = __pgprot(prot);
 
        if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
-- 
1.7.0.4


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