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xen: use _PAGE_IOMAP in ioremap to do machine mappings

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In a Xen domain, ioremap operates on machine addresses, not
pseudo-physical addresses.  We use _PAGE_IOMAP to determine whether a
mapping is intended for machine addresses.

[ Impact: allow Xen domain to map real hardware ]

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Jeremy Fitzhardinge
2010-02-04 14:46:34 -08:00
committed by Konrad Rzeszutek Wilk
parent e40152ee1e
commit c0011dbfce
2 changed files with 71 additions and 8 deletions
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8
arch/x86/include/asm/xen/page.h
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@@ -112,13 +112,9 @@ static inline xpaddr_t machine_to_phys(xmaddr_t machine)
*/
static inline unsigned long mfn_to_local_pfn(unsigned long mfn)
{
extern unsigned long max_mapnr;
unsigned long pfn = mfn_to_pfn(mfn);
if ((pfn < max_mapnr)
&& !xen_feature(XENFEAT_auto_translated_physmap)
&& (get_phys_to_machine(pfn) != mfn))
return max_mapnr; /* force !pfn_valid() */
/* XXX fixme; not true with sparsemem */
if (get_phys_to_machine(pfn) != mfn)
return -1; /* force !pfn_valid() */
return pfn;
}