From: Tetsu Yamamoto <tyamamot@redhat.com>
Date: Tue, 2 Sep 2008 16:06:11 -0400
Subject: [xen] NUMA: extend physinfo sysctl to export topo info
Message-id: 20080902200611.7876.9459.sendpatchset@pq0-1.lab.bos.redhat.com
O-Subject: [RHEL5.3 PATCH 5/5] xen: Extended the physinfo sysctl to export NUMA cpu_to_node topology info
Bugzilla: 454711
RH-Acked-by: Bill Burns <bburns@redhat.com>

bz454711
# HG changeset patch
# User kfraser@localhost.localdomain
# Date 1183734727 -3600
# Node ID 89d2192942befb0daf56e730be61d3a3c06926dd
# Parent  538c3d8aa4b14833174423ec506284279d5a33ab
Extended the physinfo sysctl to export NUMA cpu_to_node topology info.
Print this in 'xm info'.
Signed-off-by: Ryan Harper <ryanh@us.ibm.com>
Signed-off-by: Keir Fraser <keir@xensource.com>

diff --git a/include/xen/interface/sysctl.h b/include/xen/interface/sysctl.h
index be3aba1..c2badcd 100644
--- a/include/xen/interface/sysctl.h
+++ b/include/xen/interface/sysctl.h
@@ -58,6 +58,7 @@ DEFINE_XEN_GUEST_HANDLE(xen_sysctl_tbuf_op_t);
  */
 #define XEN_SYSCTL_physinfo          3
 struct xen_sysctl_physinfo {
+    /* IN variables. */
     uint32_t threads_per_core;
     uint32_t cores_per_socket;
     uint32_t sockets_per_node;
@@ -67,6 +68,23 @@ struct xen_sysctl_physinfo {
     uint64_t free_pages;
     uint64_t scrub_pages;
     uint32_t hw_cap[8];
+
+    /* IN/OUT variables. */
+    /*
+     * IN: maximum addressable entry in the caller-provided cpu_to_node array.
+     * OUT: largest cpu identifier in the system.
+     * If OUT is greater than IN then the cpu_to_node array is truncated!
+     */
+    uint32_t max_cpu_id;
+    /*
+     * If not NULL, this array is filled with node identifier for each cpu.
+     * If a cpu has no node information (e.g., cpu not present) then the
+     * sentinel value ~0u is written.
+     * The size of this array is specified by the caller in @max_cpu_id.
+     * If the actual @max_cpu_id is smaller than the array then the trailing
+     * elements of the array will not be written by the sysctl.
+     */
+    XEN_GUEST_HANDLE_64(uint32_t) cpu_to_node;
 };
 typedef struct xen_sysctl_physinfo xen_sysctl_physinfo_t;
 DEFINE_XEN_GUEST_HANDLE(xen_sysctl_physinfo_t);