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xen: fix address truncation in pte mfn<->pfn conversion 

When converting the page number in a pte/pmd/pud/pgd between
machine and pseudo-physical addresses, the converted result was
being truncated at 32-bits.  This caused failures on machines
with more than 4G of physical memory.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: "Christopher S. Aker" <caker@theshore.net>
Cc: Ian Campbell <Ian.Campbell@eu.citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2008-07-03 22:10:18 -07:00 committed by Ingo Molnar
parent 27df66a406
commit d8355aca23
1 changed files with 2 additions and 2 deletions
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4
arch/x86/xen/mmu.c
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@ -185,7 +185,7 @@ static pteval_t pte_mfn_to_pfn(pteval_t val)
if (val & _PAGE_PRESENT) {
unsigned long mfn = (val & PTE_MASK) >> PAGE_SHIFT;
pteval_t flags = val & ~PTE_MASK;
val = (mfn_to_pfn(mfn) << PAGE_SHIFT) | flags;
val = ((pteval_t)mfn_to_pfn(mfn) << PAGE_SHIFT) | flags;
}
return val;
@ -196,7 +196,7 @@ static pteval_t pte_pfn_to_mfn(pteval_t val)
if (val & _PAGE_PRESENT) {
unsigned long pfn = (val & PTE_MASK) >> PAGE_SHIFT;
pteval_t flags = val & ~PTE_MASK;
val = (pfn_to_mfn(pfn) << PAGE_SHIFT) | flags;
val = ((pteval_t)pfn_to_mfn(pfn) << PAGE_SHIFT) | flags;
}
return val;