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authorDavid Vrabel <david.vrabel@citrix.com>2014-01-07 18:03:06 +0100
committerStefano Stabellini <stefano.stabellini@eu.citrix.com>2014-09-23 15:36:20 +0200
commitf955371ca9d3986bca100666041fcfa9b6d21962 (patch)
tree37433b98ce1cecf3865a398479b148a5ebfc2e9d /arch/x86/mm/init_64.c
parentx86/xen: do not use _PAGE_IOMAP PTE flag for I/O mappings (diff)
downloadlinux-f955371ca9d3986bca100666041fcfa9b6d21962.tar.xz
linux-f955371ca9d3986bca100666041fcfa9b6d21962.zip
x86: remove the Xen-specific _PAGE_IOMAP PTE flag
The _PAGE_IO_MAP PTE flag was only used by Xen PV guests to mark PTEs that were used to map I/O regions that are 1:1 in the p2m. This allowed Xen to obtain the correct PFN when converting the MFNs read from a PTE back to their PFN. Xen guests no longer use _PAGE_IOMAP for this. Instead mfn_to_pfn() returns the correct PFN by using a combination of the m2p and p2m to determine if an MFN corresponds to a 1:1 mapping in the the p2m. Remove _PAGE_IOMAP, replacing it with _PAGE_UNUSED2 to allow for future uses of the PTE flag. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Acked-by: "H. Peter Anvin" <hpa@zytor.com>
Diffstat (limited to 'arch/x86/mm/init_64.c')
-rw-r--r--arch/x86/mm/init_64.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 5621c47d7a1a..5d984769cbd8 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -151,7 +151,7 @@ early_param("gbpages", parse_direct_gbpages_on);
* around without checking the pgd every time.
*/
-pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP;
+pteval_t __supported_pte_mask __read_mostly = ~0;
EXPORT_SYMBOL_GPL(__supported_pte_mask);
int force_personality32;