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Diffstat (limited to 'arch/x86/xen/smp.c')
-rw-r--r--arch/x86/xen/smp.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 82ac611f2fc1..e7f02eb73727 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -1,4 +1,5 @@
#include <linux/smp.h>
+#include <linux/cpu.h>
#include <linux/slab.h>
#include <linux/cpumask.h>
#include <linux/percpu.h>
@@ -114,6 +115,36 @@ int xen_smp_intr_init(unsigned int cpu)
return rc;
}
+void __init xen_smp_cpus_done(unsigned int max_cpus)
+{
+ int cpu, rc, count = 0;
+
+ if (xen_hvm_domain())
+ native_smp_cpus_done(max_cpus);
+
+ if (xen_have_vcpu_info_placement)
+ return;
+
+ for_each_online_cpu(cpu) {
+ if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS)
+ continue;
+
+ rc = cpu_down(cpu);
+
+ if (rc == 0) {
+ /*
+ * Reset vcpu_info so this cpu cannot be onlined again.
+ */
+ xen_vcpu_info_reset(cpu);
+ count++;
+ } else {
+ pr_warn("%s: failed to bring CPU %d down, error %d\n",
+ __func__, cpu, rc);
+ }
+ }
+ WARN(count, "%s: brought %d CPUs offline\n", __func__, count);
+}
+
void xen_smp_send_reschedule(int cpu)
{
xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);