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    Subject[PATCH 08/15] KVM: Add method to check for backwards-compatible API extensions
    Date
    Signed-off-by: Avi Kivity <avi@qumranet.com>
    ---
    drivers/kvm/kvm_main.c | 6 ++++++
    include/linux/kvm.h | 5 +++++
    2 files changed, 11 insertions(+), 0 deletions(-)

    diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
    index 747966e..376538c 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 93472da..c93cf53 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
    --
    1.5.0.2
    -
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