[Xen-devel] [PATCH 13/16] x86: make /dev/mem mappings _PAGE_IOMAP

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

Impact: allow hardware to be mapped via /dev/mem

Use _PAGE_IOMAP on /dev/mem mappings.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
 arch/x86/mm/pat.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 4d2a4df..56899ae 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -504,7 +504,7 @@ int free_memtype(u64 start, u64 end)
 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
                                unsigned long size, pgprot_t vma_prot)
 {
-       return vma_prot;
+       return __pgprot(pgprot_val(vma_prot) | _PAGE_IOMAP);
 }
 
 #ifdef CONFIG_STRICT_DEVMEM
-- 
1.6.0.6


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