xen: support CONFIG_MAXSMP

The MAXSMP config option requires CPUMASK_OFFSTACK, which in turn
requires we init the memory for the maps while we bring up the cpus.
MAXSMP also increases NR_CPUS to 4096. This increase in size exposed an
issue in the argument construction for multicalls from
xen_flush_tlb_others. The args should only need space for the actual
number of cpus.

Also in 2.6.39 it exposes a bootup problem.

BUG: unable to handle kernel NULL pointer dereference at           (null)
IP: [<ffffffff8157a1d3>] set_cpu_sibling_map+0x123/0x30d
...
Call Trace:
[<ffffffff81039a3f>] ? xen_restore_fl_direct_reloc+0x4/0x4
[<ffffffff819dc4db>] xen_smp_prepare_cpus+0x36/0x135
..

CC: stable@kernel.org
Signed-off-by: Andrew Jones <drjones@redhat.com>
[v2: Updated to compile on 3.0]
[v3: Updated to compile when CONFIG_SMP is not defined]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

2 files changed, 9 insertions, 1 deletions

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index afe1d54f980..673e968df3c 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -59,6 +59,7 @@
 #include <asm/page.h>
 #include <asm/init.h>
 #include <asm/pat.h>
+#include <asm/smp.h>
 
 #include <asm/xen/hypercall.h>
 #include <asm/xen/hypervisor.h>
@@ -1231,7 +1232,7 @@ static void xen_flush_tlb_others(const struct cpumask *cpus,
 {
         struct {
                 struct mmuext_op op;
-                DECLARE_BITMAP(mask, NR_CPUS);
+                DECLARE_BITMAP(mask, num_processors);
         } *args;
         struct multicall_space mcs;
 
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 41038c01de4..b4533a86d7e 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -205,11 +205,18 @@ static void __init xen_smp_prepare_boot_cpu(void)
 static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
 {
         unsigned cpu;
+        unsigned int i;
 
         xen_init_lock_cpu(0);
 
         smp_store_cpu_info(0);
         cpu_data(0).x86_max_cores = 1;
+
+        for_each_possible_cpu(i) {
+                zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
+                zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
+                zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
+        }
         set_cpu_sibling_map(0);
 
         if (xen_smp_intr_init(0))