diff options
| author | David Vrabel <david.vrabel@citrix.com> | 2014-02-24 17:39:24 +0000 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2014-02-28 15:26:59 -0500 |
| commit | aac808f01c79c1f4e2062d7b73a25b040c7b3098 (patch) | |
| tree | d0371b9c0c2f94f4b84d7dd032961ffa7395bafa /arch/x86/xen | |
| parent | a37c2d05ea77355118ff1b72dcfe9339b8f5e474 (diff) | |
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>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Acked-by: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
--
This depends on the preceeding Xen changes, so I think it would be
best if this was acked by an x86 maintainer and merged via the Xen
tree.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86/xen')
| -rw-r--r-- | arch/x86/xen/enlighten.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 201d09a7c46b..c5e21e36a119 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -1555,8 +1555,6 @@ asmlinkage void __init xen_start_kernel(void) #endif __supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD); - __supported_pte_mask |= _PAGE_IOMAP; - /* * Prevent page tables from being allocated in highmem, even * if CONFIG_HIGHPTE is enabled. |