From: Avi Kivity <avi@qumranet.com>
Date: Thu, 1 Mar 2007 15:56:20 +0000 (+0200)
Subject: KVM: Add method to check for backwards-compatible API extensions
X-Git-Tag: v2.6.22-rc1~1008^2~54
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5d308f4550d9dc4c236e08b0377b610b9578577b;p=linux-2.6

KVM: Add method to check for backwards-compatible API extensions

Signed-off-by: Avi Kivity <avi@qumranet.com>
---

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 5d24203afd..39cf8fd343 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -2416,6 +2416,12 @@ static long kvm_dev_ioctl(struct file *filp,
 		r = 0;
 		break;
 	}
+	case KVM_CHECK_EXTENSION:
+		/*
+		 * No extensions defined at present.
+		 */
+		r = 0;
+		break;
 	default:
 		;
 	}
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 93472daec1..c93cf53953 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -232,6 +232,11 @@ struct kvm_cpuid {
 #define KVM_GET_API_VERSION       _IO(KVMIO,   0x00)
 #define KVM_CREATE_VM             _IO(KVMIO,   0x01) /* returns a VM fd */
 #define KVM_GET_MSR_INDEX_LIST    _IOWR(KVMIO, 0x02, struct kvm_msr_list)
+/*
+ * Check if a kvm extension is available.  Argument is extension number,
+ * return is 1 (yes) or 0 (no, sorry).
+ */
+#define KVM_CHECK_EXTENSION       _IO(KVMIO,   0x03)
 
 /*
  * ioctls for VM fds