[PATCH] Allow PV superpages to work with live migration

[Dave McCracken <dcm@mccr.org>]

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PV superpages currently do not work with live migration.  They fall over dead 
when the shadow page table is enabled for dirty tracking.  The HVM support for 
superpages in this code has been tested and found to work just fine for PV 
superpages.  This patch modifies the test macro to allow the code to work with 
PV superpages.

Dave McCracken
Oracle Corp.

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--- xen-unstable//xen/include/asm-x86/guest_pt.h	2010-04-19 09:23:24.000000000 -0500
+++ xen-hmigrate//xen/include/asm-x86/guest_pt.h	2010-05-17 14:00:34.000000000 -0500
@@ -186,10 +186,11 @@ guest_supports_superpages(struct vcpu *v
     /* The _PAGE_PSE bit must be honoured in HVM guests, whenever
      * CR4.PSE is set or the guest is in PAE or long mode. 
      * It's also used in the dummy PT for vcpus with CR4.PG cleared. */
-    return (is_hvm_vcpu(v) && 
-            (GUEST_PAGING_LEVELS != 2 
-             || !hvm_paging_enabled(v)
-             || (v->arch.hvm_vcpu.guest_cr[4] & X86_CR4_PSE)));
+    return (opt_allow_hugepage ||
+	    (is_hvm_vcpu(v) && 
+	     (GUEST_PAGING_LEVELS != 2 
+	      || !hvm_paging_enabled(v)
+	      || (v->arch.hvm_vcpu.guest_cr[4] & X86_CR4_PSE))));
 }
 
 static inline int

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