The event channel ABI passes a pointer to a subop-specific structure. Some of
these structures however are smaller than the pointers passed in the ABI;
EVTCHNOP_send specifically passes a 4 byte evtchn port, using a 4 or 8 byte
pointer.
For translated guests (x86 HVM and all ARM), passing the por
Pau Monne
> Subject: [Xen-devel] [PATCH RFC] xen/evtchn: Implement
> EVTCHNOP_send_imm as a companian to EVTCHNOP_send
>
> The event channel ABI passes a pointer to a subop-specific structure. Some
> of
> these structures however are smaller than the pointers passed in the ABI;
On 07/13/2017 09:50 AM, Andrew Cooper wrote:
The event channel ABI passes a pointer to a subop-specific structure. Some of
these structures however are smaller than the pointers passed in the ABI;
EVTCHNOP_send specifically passes a 4 byte evtchn port, using a 4 or 8 byte
pointer.
For translate
On Thu, Jul 13, 2017 at 12:14:35PM +0200, Juergen Groß wrote:
> On 07/13/2017 09:50 AM, Andrew Cooper wrote:
> > The event channel ABI passes a pointer to a subop-specific structure. Some
> > of
> > these structures however are smaller than the pointers passed in the ABI;
> > EVTCHNOP_send specif
>>> Andrew Cooper 07/13/17 9:50 AM >>>
>RFC: is it worth converting the close, unmask, reset (and possibly
>expand_array) as well?
I can't see close and even more so reset to be performance critical.
Unmask otoh may be (depending on use); no sure about expand_array.
Jan
___
ger Pau Monne
> Subject: Re: [Xen-devel] [PATCH RFC] xen/evtchn: Implement
> EVTCHNOP_send_imm as a companian to EVTCHNOP_send
>
> >>> Andrew Cooper 07/13/17 9:50 AM >>>
> >RFC: is it worth converting the close, unmask, reset (and possibly
> >expand_a
>>> On 13.07.17 at 09:50, wrote:
> --- a/xen/common/event_channel.c
> +++ b/xen/common/event_channel.c
> @@ -1098,6 +1098,10 @@ long do_event_channel_op(int cmd,
> XEN_GUEST_HANDLE_PARAM(void) arg)
> break;
> }
>
> +case EVTCHNOP_send_imm:
> +rc = evtchn_send(current->
On Fri, 14 Jul 2017, Jan Beulich wrote:
> >>> On 13.07.17 at 09:50, wrote:
> > --- a/xen/common/event_channel.c
> > +++ b/xen/common/event_channel.c
> > @@ -1098,6 +1098,10 @@ long do_event_channel_op(int cmd,
> > XEN_GUEST_HANDLE_PARAM(void) arg)
> > break;
> > }
> >
> > +cas
On 17/07/2017 19:30, Stefano Stabellini wrote:
> On Fri, 14 Jul 2017, Jan Beulich wrote:
> On 13.07.17 at 09:50, wrote:
>>> --- a/xen/common/event_channel.c
>>> +++ b/xen/common/event_channel.c
>>> @@ -1098,6 +1098,10 @@ long do_event_channel_op(int cmd,
>>> XEN_GUEST_HANDLE_PARAM(void) arg)
