linux-kernel - [PATCH] [46/58] x86_64: fake apicid_to

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 19 Jul 2007 11:55:32 +0200 (CEST)
From:	Andi Kleen <ak@...e.de>
To:	rientjes@...gle.com, ak@...e.de, patches@...-64.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] [46/58] x86_64: fake apicid_to_node mapping for fake numa


From: David Rientjes <rientjes@...gle.com>

When we are in the emulated NUMA case, we need to make sure that all existing
apicid_to_node mappings that point to real node ID's now point to the
equivalent fake node ID's.

If we simply iterate over all apicid_to_node[] members for each node, we risk
remapping an entry if it shares a node ID with a real node.  Since apicid's
may not be consecutive, we're forced to create an automatic array of
apicid_to_node mappings and then copy it over once we have finished remapping
fake to real nodes.

Cc: Andi Kleen <ak@...e.de>
Signed-off-by: David Rientjes <rientjes@...gle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Andi Kleen <ak@...e.de>

---

 arch/x86_64/mm/srat.c |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

Index: linux/arch/x86_64/mm/srat.c
===================================================================
--- linux.orig/arch/x86_64/mm/srat.c
+++ linux/arch/x86_64/mm/srat.c
@@ -470,10 +470,13 @@ static int __init find_node_by_addr(unsi
  */
 void __init acpi_fake_nodes(const struct bootnode *fake_nodes, int num_nodes)
 {
-	int i;
+	int i, j;
 	int fake_node_to_pxm_map[MAX_NUMNODES] = {
 		[0 ... MAX_NUMNODES-1] = PXM_INVAL
 	};
+	unsigned char fake_apicid_to_node[MAX_LOCAL_APIC] = {
+		[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
+	};
 
 	printk(KERN_INFO "Faking PXM affinity for fake nodes on real "
 			 "topology.\n");
@@ -487,9 +490,17 @@ void __init acpi_fake_nodes(const struct
 		if (pxm == PXM_INVAL)
 			continue;
 		fake_node_to_pxm_map[i] = pxm;
+		/*
+		 * For each apicid_to_node mapping that exists for this real
+		 * node, it must now point to the fake node ID.
+		 */
+		for (j = 0; j < MAX_LOCAL_APIC; j++)
+			if (apicid_to_node[j] == nid)
+				fake_apicid_to_node[j] = i;
 	}
 	for (i = 0; i < num_nodes; i++)
 		__acpi_map_pxm_to_node(fake_node_to_pxm_map[i], i);
+	memcpy(apicid_to_node, fake_apicid_to_node, sizeof(apicid_to_node));
 
 	nodes_clear(nodes_parsed);
 	for (i = 0; i < num_nodes; i++)
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/