[Xen-changelog] [xen-unstable] x86 dom builder: Allocate domU pages in batches.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1237457055 0
# Node ID f0d033f0a319d4ce0b20244cee68998a7afd3317
# Parent  2039e82710512f2b4b45f83cf4cdb3b037bf0d7c
x86 dom builder: Allocate domU pages in batches.

Allows a 32-bit dom0 to create very large guests.

Signed-off-by: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
 tools/libxc/xc_dom_x86.c |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)

diff -r 2039e8271051 -r f0d033f0a319 tools/libxc/xc_dom_x86.c
--- a/tools/libxc/xc_dom_x86.c  Wed Mar 18 17:30:13 2009 +0000
+++ b/tools/libxc/xc_dom_x86.c  Thu Mar 19 10:04:15 2009 +0000
@@ -694,7 +694,7 @@ int arch_setup_meminit(struct xc_dom_ima
 int arch_setup_meminit(struct xc_dom_image *dom)
 {
     int rc;
-    xen_pfn_t pfn;
+    xen_pfn_t pfn, allocsz, i;
 
     rc = x86_compat(dom->guest_xc, dom->guest_domid, dom->guest_type);
     if ( rc )
@@ -713,9 +713,15 @@ int arch_setup_meminit(struct xc_dom_ima
         dom->p2m_host[pfn] = pfn;
 
     /* allocate guest memory */
-    rc = xc_domain_memory_populate_physmap(dom->guest_xc, dom->guest_domid,
-                                           dom->total_pages, 0, 0,
-                                           dom->p2m_host);
+    for ( i = rc = allocsz = 0; (i < dom->total_pages) && !rc; i += allocsz )
+    {
+        allocsz = dom->total_pages - i;
+        if ( allocsz > 1024*1024 )
+            allocsz = 1024*1024;
+        rc = xc_domain_memory_populate_physmap(
+            dom->guest_xc, dom->guest_domid, allocsz, 0, 0, &dom->p2m_host[i]);
+    }
+
     return rc;
 }
 

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