[XenPPC] [RFC][PATCH] 1/5] [POWERPC] Introduce a PFN decoration.

[Tony Breeds <tony@xxxxxxxxxxxxxxxxxx>]

This bit can be OR'ed into a MFN, to allow dom0 to map it.

Signed-off-by: Tony Breeds <tony@xxxxxxxxxxxxxxxxxx>
---

 xen/arch/powerpc/mm.c        |    5 ++++-
 xen/include/asm-powerpc/mm.h |    3 +++
 2 files changed, 7 insertions(+), 1 deletion(-)

Index: xenppc-unstable.hg.working/xen/arch/powerpc/mm.c
===================================================================
--- xenppc-unstable.hg.working.orig/xen/arch/powerpc/mm.c
+++ xenppc-unstable.hg.working/xen/arch/powerpc/mm.c
@@ -408,7 +408,10 @@ ulong pfn2mfn(struct domain *d, ulong pf
     ulong foreign_map_pfn = 1UL << cpu_foreign_map_order();
 
     /* quick tests first */
-    if (pfn & foreign_map_pfn) {
+    if (pfn & PFN_DECOR) {
+        /* FIXME: Better PFN_TYPE: PFN_TYPE_XEN? */
+        mfn = pfn & ~(PFN_DECOR);
+    } else if (pfn & foreign_map_pfn) {
         t = PFN_TYPE_FOREIGN;
         mfn = foreign_to_mfn(d, pfn);
     } else if (pfn >= max_page && pfn < (max_page + NR_GRANT_FRAMES)) {
Index: xenppc-unstable.hg.working/xen/include/asm-powerpc/mm.h
===================================================================
--- xenppc-unstable.hg.working.orig/xen/include/asm-powerpc/mm.h
+++ xenppc-unstable.hg.working/xen/include/asm-powerpc/mm.h
@@ -246,6 +246,9 @@ extern unsigned long paddr_to_maddr(unsi
 #define PFN_TYPE_FOREIGN 4
 #define PFN_TYPE_GNTTAB 5
 
+/* Or'd into xenheap MFNs to ensure dom0 can access these pages */
+#define PFN_DECOR      (1<<31)
+
 extern ulong pfn2mfn(struct domain *d, ulong pfn, int *type);
 static inline unsigned long gmfn_to_mfn(struct domain *d, unsigned long gmfn)
 {


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