[Xen-devel] [PATCH 4/5] [POST-4.0]: HVM NUMA guest: guest NUMA aware memory allocation

[Andre Przywara <andre.przywara@xxxxxxx>]

This patch allocates the guest's memory according to the given setup. 
The appropriate host node number will be determined by the guest_to_host 
mapping (which is simply round robin until the code for automatic 
allocation is in place).
Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>

Regards,
Andre.

--
Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
Tel: +49 351 488-3567-12
----to satisfy European Law for business letters:
Advanced Micro Devices GmbH
Karl-Hammerschmidt-Str. 34, 85609 Dornach b. Muenchen
Geschaeftsfuehrer: Andrew Bowd; Thomas M. McCoy; Giuliano Meroni
Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen
Registergericht Muenchen, HRB Nr. 43632

commit 1c5557b78834fac72ae2455295f31c017208156f
Author: Andre Przywara <andre.przywara@xxxxxxx>
Date:   Mon Feb 1 12:23:19 2010 +0100

    allocate guest memory according to specified NUMA setup

diff --git a/tools/libxc/xc_hvm_build.c b/tools/libxc/xc_hvm_build.c
index 02103b1..3eb06c8 100644
--- a/tools/libxc/xc_hvm_build.c
+++ b/tools/libxc/xc_hvm_build.c
@@ -121,6 +121,8 @@ static int setup_guest(int xc_handle,
     struct elf_binary elf;
     uint64_t v_start, v_end;
     int rc;
+    int hostnode, node;
+    uint64_t next_node;
     xen_capabilities_info_t caps;
     int pod_mode = 0;
     
@@ -174,8 +176,16 @@ static int setup_guest(int xc_handle,
      * We allocate pages in batches of no more than 8MB to ensure that
      * we can be preempted and hence dom0 remains responsive.
      */
+    hostnode = -1;
+    node = 0;
+    next_node = nr_pages;
+    if (numainfo != NULL && numainfo->num_nodes > 1)
+    {
+        next_node = numainfo->node_mem[node] >> (PAGE_SHIFT - 10);
+        hostnode = numainfo->guest_to_host_node[node];
+    }
     rc = xc_domain_memory_populate_physmap(
-        xc_handle, dom, 0xa0, 0, 0, &page_array[0x00]);
+        xc_handle, dom, 0xa0, 0, XENMEMF_node(hostnode), &page_array[0x00]);
     cur_pages = 0xc0;
     while ( (rc == 0) && (nr_pages > cur_pages) )
     {
@@ -184,6 +194,13 @@ static int setup_guest(int xc_handle,
         if ( count > 2048 )
             count = 2048;
 
+        if (cur_pages >= next_node)
+        {
+            node++;
+            next_node += numainfo->node_mem[node] >> (PAGE_SHIFT - 10);
+            hostnode = numainfo->guest_to_host_node[node];
+        }
+
         /* Clip partial superpage extents to superpage boundaries. */
         if ( ((cur_pages & (SUPERPAGE_NR_PFNS-1)) != 0) &&
              (count > (-cur_pages & (SUPERPAGE_NR_PFNS-1))) )
@@ -200,11 +217,12 @@ static int setup_guest(int xc_handle,
             struct xen_memory_reservation sp_req = {
                 .nr_extents   = count >> SUPERPAGE_PFN_SHIFT,
                 .extent_order = SUPERPAGE_PFN_SHIFT,
-                .domid        = dom
+                .domid        = dom,
+                .mem_flags    = XENMEMF_node(hostnode)
             };
 
             if ( pod_mode )
-                sp_req.mem_flags = XENMEMF_populate_on_demand;
+                sp_req.mem_flags |= XENMEMF_populate_on_demand;
 
             set_xen_guest_handle(sp_req.extent_start, sp_extents);
             for ( i = 0; i < sp_req.nr_extents; i++ )
@@ -227,7 +245,8 @@ static int setup_guest(int xc_handle,
         if ( count != 0 )
         {
             rc = xc_domain_memory_populate_physmap(
-                xc_handle, dom, count, 0, 0, &page_array[cur_pages]);
+                xc_handle, dom, count, 0, XENMEMF_node(hostnode),
+                &page_array[cur_pages]);
             cur_pages += count;
             if ( pod_mode )
                 pod_pages -= count;

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