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Commit 5d308f45 authored by Avi Kivity's avatar Avi Kivity
Browse files

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



Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent 739872c5

drivers/kvm/kvm_main.c

+6 −0
Original line number Original line Diff line number Diff line
@@ -2416,6 +2416,12 @@ static long kvm_dev_ioctl(struct file *filp, 
		r = 0;

		r = 0;

		break;

		break;

	}

	}

	case KVM_CHECK_EXTENSION:

		/*

		 * No extensions defined at present.

		 */

		r = 0;

		break;

	default:

	default:

		;

		;

	}

	}

include/linux/kvm.h

+5 −0
Original line number Original line Diff line number Diff line
@@ -232,6 +232,11 @@ struct kvm_cpuid { 
#define KVM_GET_API_VERSION       _IO(KVMIO,   0x00)

#define KVM_GET_API_VERSION       _IO(KVMIO,   0x00)

#define KVM_CREATE_VM             _IO(KVMIO,   0x01) /* returns a VM fd */

#define KVM_CREATE_VM             _IO(KVMIO,   0x01) /* returns a VM fd */

#define KVM_GET_MSR_INDEX_LIST    _IOWR(KVMIO, 0x02, struct kvm_msr_list)

#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

 * ioctls for VM fds