KVM: Portability: move KVM_CHECK_EXTENSION

Make KVM_CHECK_EXTENSION code into a function, all archs can define its
capability independently.

Signed-off-by: Zhang Xiantao <xiantao.zhang@intel.com>
Acked-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

3 files changed, 25 insertions, 16 deletions

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 96d9c7da14c2..a7be0733bc48 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -628,6 +628,9 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
                          unsigned int ioctl, unsigned long arg);
 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
+
+int kvm_dev_ioctl_check_extension(long ext);
+
 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
                                    struct
                                    kvm_userspace_memory_region *mem,
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index e0f20d020281..c782f27265de 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -1198,23 +1198,9 @@ static long kvm_dev_ioctl(struct file *filp,
                         goto out;
                 r = kvm_dev_ioctl_create_vm();
                 break;
-        case KVM_CHECK_EXTENSION: {
-                int ext = (long)argp;
-
-                switch (ext) {
-                case KVM_CAP_IRQCHIP:
-                case KVM_CAP_HLT:
-                case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
-                case KVM_CAP_USER_MEMORY:
-                case KVM_CAP_SET_TSS_ADDR:
-                        r = 1;
-                        break;
-                default:
-                        r = 0;
-                        break;
-                }
+        case KVM_CHECK_EXTENSION:
+                r = kvm_dev_ioctl_check_extension((long)argp);
                 break;
-        }
         case KVM_GET_VCPU_MMAP_SIZE:
                 r = -EINVAL;
                 if (arg)
diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c
index bbfa810bf8bd..609792637fb4 100644
--- a/drivers/kvm/x86.c
+++ b/drivers/kvm/x86.c
@@ -599,6 +599,26 @@ void decache_vcpus_on_cpu(int cpu)
         spin_unlock(&kvm_lock);
 }
 
+int kvm_dev_ioctl_check_extension(long ext)
+{
+        int r;
+
+        switch (ext) {
+        case KVM_CAP_IRQCHIP:
+        case KVM_CAP_HLT:
+        case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
+        case KVM_CAP_USER_MEMORY:
+        case KVM_CAP_SET_TSS_ADDR:
+                r = 1;
+                break;
+        default:
+                r = 0;
+                break;
+        }
+        return r;
+
+}
+
 long kvm_arch_dev_ioctl(struct file *filp,
                         unsigned int ioctl, unsigned long arg)
 {