1 files changed, 28 insertions, 2 deletions

diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 141eb0de8b06..a01e6532b46a 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -522,11 +522,20 @@ static bool __init __early_alloc_p2m(unsigned long pfn)
         /* Boundary cross-over for the edges: */
         if (idx) {
                 unsigned long *p2m = extend_brk(PAGE_SIZE, PAGE_SIZE);
+                unsigned long *mid_mfn_p;
 
                 p2m_init(p2m);
 
                 p2m_top[topidx][mididx] = p2m;
 
+                /* For save/restore we need to MFN of the P2M saved */
+                
+                mid_mfn_p = p2m_top_mfn_p[topidx];
+                WARN(mid_mfn_p[mididx] != virt_to_mfn(p2m_missing),
+                        "P2M_TOP_P[%d][%d] != MFN of p2m_missing!\n",
+                        topidx, mididx);
+                mid_mfn_p[mididx] = virt_to_mfn(p2m);
+
         }
         return idx != 0;
 }
@@ -549,12 +558,29 @@ unsigned long __init set_phys_range_identity(unsigned long pfn_s,
                 pfn += P2M_MID_PER_PAGE * P2M_PER_PAGE)
         {
                 unsigned topidx = p2m_top_index(pfn);
-                if (p2m_top[topidx] == p2m_mid_missing) {
-                        unsigned long **mid = extend_brk(PAGE_SIZE, PAGE_SIZE);
+                unsigned long *mid_mfn_p;
+                unsigned long **mid;
+
+                mid = p2m_top[topidx];
+                mid_mfn_p = p2m_top_mfn_p[topidx];
+                if (mid == p2m_mid_missing) {
+                        mid = extend_brk(PAGE_SIZE, PAGE_SIZE);
 
                         p2m_mid_init(mid);
 
                         p2m_top[topidx] = mid;
+
+                        BUG_ON(mid_mfn_p != p2m_mid_missing_mfn);
+                }
+                /* And the save/restore P2M tables.. */
+                if (mid_mfn_p == p2m_mid_missing_mfn) {
+                        mid_mfn_p = extend_brk(PAGE_SIZE, PAGE_SIZE);
+                        p2m_mid_mfn_init(mid_mfn_p);
+
+                        p2m_top_mfn_p[topidx] = mid_mfn_p;
+                        p2m_top_mfn[topidx] = virt_to_mfn(mid_mfn_p);
+                        /* Note: we don't set mid_mfn_p[midix] here,
+                         * look in __early_alloc_p2m */
                 }
         }