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

To: Ingo Molnar <mingo@xxxxxxx>
Subject: [Xen-devel] [PATCH 13/16] x86: make /dev/mem mappings _PAGE_IOMAP
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Wed, 27 May 2009 00:15:35 -0700
Cc: Chris Wright <chrisw@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ky Srinivasan <ksrinivasan@xxxxxxxxxx>, kurt.hackel@xxxxxxxxxx, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, Jens Axboe <jens.axboe@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Greg KH <gregkh@xxxxxxx>
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From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

Use _PAGE_IOMAP on /dev/mem mappings.

[ Impact: allow hardware to be mapped via /dev/mem in Xen ]

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 5ba8d88..3f7886f 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -494,7 +494,7 @@ 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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