KVM: VMX: Add cpu consistency check

All the physical CPUs on the board should support the same VMX feature
set.  Add check_processor_compatibility to kvm_arch_ops for the consistency
check.

Signed-off-by: Sheng Yang <sheng.yang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 5dee3024579d..2be6b1ca1a06 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -3102,6 +3102,7 @@ int kvm_init_arch(struct kvm_arch_ops *ops, unsigned int vcpu_size,
                   struct module *module)
 {
         int r;
+        int cpu;
 
         if (kvm_arch_ops) {
                 printk(KERN_ERR "kvm: already loaded the other module\n");
@@ -3123,6 +3124,14 @@ int kvm_init_arch(struct kvm_arch_ops *ops, unsigned int vcpu_size,
         if (r < 0)
                 goto out;
 
+        for_each_online_cpu(cpu) {
+                smp_call_function_single(cpu,
+                                kvm_arch_ops->check_processor_compatibility,
+                                &r, 0, 1);
+                if (r < 0)
+                        goto out_free_0;
+        }
+
         on_each_cpu(hardware_enable, NULL, 0, 1);
         r = register_cpu_notifier(&kvm_cpu_notifier);
         if (r)
@@ -3169,6 +3178,7 @@ out_free_2:
         unregister_cpu_notifier(&kvm_cpu_notifier);
 out_free_1:
         on_each_cpu(hardware_disable, NULL, 0, 1);
+out_free_0:
         kvm_arch_ops->hardware_unsetup();
 out:
         kvm_arch_ops = NULL;