Xen devel - Jul 2010 - [PATCH] xen: make the shadow allocation hypercalls include the p2m

xen: make the shadow allocation hypercalls include the p2m memory
in the total shadow allocation. This makes the effect of allocation
changes consistent regardless of p2m activity on boot.

Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com>

diff -r f84ac3cbeb0d xen/arch/x86/mm/hap/hap.c
--- a/xen/arch/x86/mm/hap/hap.c	Fri Jun 05 11:42:07 2009 +0100
+++ b/xen/arch/x86/mm/hap/hap.c	Mon Jun 08 11:20:54 2009 +0100
@@ -181,7 +181,8 @@
 static unsigned int
 hap_get_allocation(struct domain *d)
 {
-    unsigned int pg = d->arch.paging.hap.total_pages;
+    unsigned int pg = d->arch.paging.hap.total_pages
+        + d->arch.paging.hap.p2m_pages;
 
     return ((pg >> (20 - PAGE_SHIFT))
             + ((pg & ((1 << (20 - PAGE_SHIFT)) - 1)) ? 1 : 0));
@@ -195,6 +196,11 @@
     struct page_info *pg;
 
     ASSERT(hap_locked_by_me(d));
+
+    if ( pages < d->arch.paging.hap.p2m_pages )
+        pages = 0;
+    else
+        pages -= d->arch.paging.hap.p2m_pages;
 
     while ( d->arch.paging.hap.total_pages != pages )
     {
@@ -214,6 +220,11 @@
         else if ( d->arch.paging.hap.total_pages > pages )
         {
             /* Need to return memory to domheap */
+            if ( page_list_empty(&d->arch.paging.hap.freelist) )
+            {
+                HAP_PRINTK("failed to free enough hap pages.\n");
+                return -ENOMEM;
+            }
             pg = page_list_remove_head(&d->arch.paging.hap.freelist);
             ASSERT(pg);
             d->arch.paging.hap.free_pages--;
diff -r f84ac3cbeb0d xen/arch/x86/mm/shadow/common.c
--- a/xen/arch/x86/mm/shadow/common.c	Fri Jun 05 11:42:07 2009 +0100
+++ b/xen/arch/x86/mm/shadow/common.c	Mon Jun 08 11:20:54 2009 +0100
@@ -1788,14 +1788,24 @@
     unsigned int j, order = shadow_max_order(d);
 
     ASSERT(shadow_locked_by_me(d));
-    
-    /* Don''t allocate less than the minimum acceptable, plus one page
per
-     * megabyte of RAM (for the p2m table) */
-    lower_bound = shadow_min_acceptable_pages(d) + (d->tot_pages / 256);
-    if ( pages > 0 && pages < lower_bound )
-        pages = lower_bound;
-    /* Round up to largest block size */
-    pages = (pages + ((1<<SHADOW_MAX_ORDER)-1)) &
~((1<<SHADOW_MAX_ORDER)-1);
+
+    if ( pages > 0 )
+    {
+        /* Check for minimum value. */
+        if ( pages < d->arch.paging.shadow.p2m_pages )
+            pages = 0;
+        else
+            pages -= d->arch.paging.shadow.p2m_pages;
+        
+        /* Don''t allocate less than the minimum acceptable, plus one
page per
+         * megabyte of RAM (for the p2m table) */
+        lower_bound = shadow_min_acceptable_pages(d) + (d->tot_pages / 256);
+        if ( pages < lower_bound )
+            pages = lower_bound;
+        
+        /* Round up to largest block size */
+        pages = (pages + ((1<<SHADOW_MAX_ORDER)-1)) &
~((1<<SHADOW_MAX_ORDER)-1);
+    }
 
     SHADOW_PRINTK("current %i target %i\n", 
                    d->arch.paging.shadow.total_pages, pages);
@@ -1855,7 +1865,8 @@
 /* Return the size of the shadow pool, rounded up to the nearest MB */
 static unsigned int shadow_get_allocation(struct domain *d)
 {
-    unsigned int pg = d->arch.paging.shadow.total_pages;
+    unsigned int pg = d->arch.paging.shadow.total_pages
+        + d->arch.paging.shadow.p2m_pages;
     return ((pg >> (20 - PAGE_SHIFT))
             + ((pg & ((1 << (20 - PAGE_SHIFT)) - 1)) ? 1 : 0));
 }

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