[PATCH][P2M] check whether hap mode is enabled before using 2mb pages

[PATCH][P2M] check whether hap mode is enabled before using 2mb pages

[Wei Huang]

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This small patch checks whether hap mode is enabled when guest is trying 
to allocate 2MB pages inside P2M. This prevents potential errors when 
hap is disabled.

Cc: Chris Lalancette <clalance@redhat.com>
Cc: Sarathy, Bhavna <Bhavna.Sarathy@amd.com>
Signed-off-by: Wei Huang <wei.huang2@amd.com>




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diff -r 55ca7ef865b4 xen/arch/x86/mm/p2m.c
--- a/xen/arch/x86/mm/p2m.c	Tue Jun 16 11:01:17 2009 +0100
+++ b/xen/arch/x86/mm/p2m.c	Thu Jun 18 13:07:10 2009 -0500
@@ -1499,7 +1499,11 @@ int set_p2m_entry(struct domain *d, unsi
 
     while ( todo )
     {
-        order = (((gfn | mfn_x(mfn) | todo) & ((1ul << 9) - 1)) == 0) ? 9 : 0;
+        if ( is_hvm_domain(d) && d->arch.hvm_domain.hap_enabled )
+            order = (((gfn | mfn_x(mfn) | todo) & ((1ul << 9) - 1)) == 0) ?
+                9 : 0;
+        else
+            order = 0;
         rc = d->arch.p2m->set_entry(d, gfn, mfn, order, p2mt);
         gfn += 1ul << order;
         if ( mfn_x(mfn) != INVALID_MFN )

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