Re: [Xen-devel] [PATCHv1] xen/evtchn: add IOCTL_EVTCHN_RESTRICT

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 07/11/2016 10:57 AM, David Vrabel wrote:
> diff --git a/include/uapi/xen/evtchn.h b/include/uapi/xen/evtchn.h
> index 14e833ee4..f057b53 100644
> --- a/include/uapi/xen/evtchn.h
> +++ b/include/uapi/xen/evtchn.h
> @@ -85,4 +85,19 @@ struct ioctl_evtchn_notify {
>  #define IOCTL_EVTCHN_RESET                           \
>       _IOC(_IOC_NONE, 'E', 5, 0)
>  
> +/*
> + * Restrict this file descriptor so that it can only be used to bind
> + * new interdomain events from one domain.
> + *
> + * Once a file descriptor has been restricted it cannot be
> + * de-restricted, and must be closed and re-opened.  Event channels
> + * which were bound before restricting remain bound afterwards, and
> + * can be notified as usual.
> + */
> +#define IOCTL_EVTCHN_RESTRICT_DOMID                  \
> +     _IOC(_IOC_NONE, 'E', 100, sizeof(struct ioctl_evtchn_restrict_domid))

Is there a reason why you picked 100 and not 6?

-boris



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