1 files changed, 26 insertions, 0 deletions

diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index f4d010031465..72a4c7959045 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -28,6 +28,7 @@
 #include <asm/xen/interface.h>
 #include <asm/xen/hypercall.h>
 
+#include <xen/xen.h>
 #include <xen/page.h>
 #include <xen/events.h>
 
@@ -156,11 +157,35 @@ static void __init xen_fill_possible_map(void)
 {
         int i, rc;
 
+        if (xen_initial_domain())
+                return;
+
+        for (i = 0; i < nr_cpu_ids; i++) {
+                rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
+                if (rc >= 0) {
+                        num_processors++;
+                        set_cpu_possible(i, true);
+                }
+        }
+}
+
+static void __init xen_filter_cpu_maps(void)
+{
+        int i, rc;
+
+        if (!xen_initial_domain())
+                return;
+
+        num_processors = 0;
+        disabled_cpus = 0;
         for (i = 0; i < nr_cpu_ids; i++) {
                 rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
                 if (rc >= 0) {
                         num_processors++;
                         set_cpu_possible(i, true);
+                } else {
+                        set_cpu_possible(i, false);
+                        set_cpu_present(i, false);
                 }
         }
 }
@@ -174,6 +199,7 @@ static void __init xen_smp_prepare_boot_cpu(void)
            old memory can be recycled */
         make_lowmem_page_readwrite(xen_initial_gdt);
 
+        xen_filter_cpu_maps();
         xen_setup_vcpu_info_placement();
 }