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x86/xen: fix set_phys_range_identity() if pfn_e > MAX_P2M_PFN

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Allow set_phys_range_identity() to work with a range that overlaps
MAX_P2M_PFN by clamping pfn_e to MAX_P2M_PFN.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
David Vrabel
2014-01-06 11:55:13 +00:00
parent fcca2e3119
commit a9b5bff66b
1 changed files with 4 additions and 1 deletions
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5
arch/x86/xen/p2m.c
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@@ -774,7 +774,7 @@ unsigned long __init set_phys_range_identity(unsigned long pfn_s,
{ {
unsigned long pfn; unsigned long pfn;
if (unlikely(pfn_s >= MAX_P2M_PFN || pfn_e >= MAX_P2M_PFN)) if (unlikely(pfn_s >= MAX_P2M_PFN))
return 0; return 0;
if (unlikely(xen_feature(XENFEAT_auto_translated_physmap))) if (unlikely(xen_feature(XENFEAT_auto_translated_physmap)))
@@ -783,6 +783,9 @@ unsigned long __init set_phys_range_identity(unsigned long pfn_s,
if (pfn_s > pfn_e) if (pfn_s > pfn_e)
return 0; return 0;
if (pfn_e > MAX_P2M_PFN)
pfn_e = MAX_P2M_PFN;
for (pfn = (pfn_s & ~(P2M_MID_PER_PAGE * P2M_PER_PAGE - 1)); for (pfn = (pfn_s & ~(P2M_MID_PER_PAGE * P2M_PER_PAGE - 1));
pfn < ALIGN(pfn_e, (P2M_MID_PER_PAGE * P2M_PER_PAGE)); pfn < ALIGN(pfn_e, (P2M_MID_PER_PAGE * P2M_PER_PAGE));
pfn += P2M_MID_PER_PAGE * P2M_PER_PAGE) pfn += P2M_MID_PER_PAGE * P2M_PER_PAGE)