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| author | David Vrabel <david.vrabel@citrix.com> | 2014-01-07 17:03:06 +0000 |
|---|---|---|
| committer | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2014-09-23 13:36:20 +0000 |
| commit | f955371ca9d3986bca100666041fcfa9b6d21962 (patch) | |
| tree | 37433b98ce1cecf3865a398479b148a5ebfc2e9d /arch/x86/xen/enlighten.c | |
| parent | 7f2f88224517cdaad68b772b2a2095b87dc72886 (diff) | |
| download | linux-f955371ca9d3986bca100666041fcfa9b6d21962.tar.gz linux-f955371ca9d3986bca100666041fcfa9b6d21962.tar.bz2 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/xen/enlighten.c')
| -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 c0cb11fb5008..be1cff572ccf 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -1559,8 +1559,6 @@ asmlinkage __visible 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. |