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Re: [Xen-devel] [PATCH] evtchn: make support for different ABIs tunable
- To: Eslam Elnikety <elnikety@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 7 Aug 2019 14:41:58 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, David Woodhouse <dwmw@xxxxxxxxxxxx>
- Delivery-date: Wed, 07 Aug 2019 13:42:31 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 07/08/2019 12:20, Eslam Elnikety wrote:
> diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
> index 19486d5e32..654b4fdd22 100644
> --- a/xen/include/public/domctl.h
> +++ b/xen/include/public/domctl.h
> @@ -64,6 +64,9 @@ struct xen_domctl_createdomain {
> /* Is this a xenstore domain? */
> #define _XEN_DOMCTL_CDF_xs_domain 4
> #define XEN_DOMCTL_CDF_xs_domain (1U<<_XEN_DOMCTL_CDF_xs_domain)
> + /* Disable FIFO event channels? */
> +#define _XEN_DOMCTL_CDF_disable_fifo 5
> +#define XEN_DOMCTL_CDF_disable_fifo (1U<<_XEN_DOMCTL_CDF_disable_fifo)
> uint32_t flags;
On the subject of the the patch itself, I think this is broadly the
right principle, but wants to be expressed differently.
First, you'll want to rebase onto a very recent master, and specifically
over c/s d8f2490561eb which has changed how this field is handled in Xen.
Furthermore, if there is this problem for event channels, then there is
almost certainly a related problem for grant tables.
The control in Xen should be expressed in a positive form, or the logic
will become a tangle. It should be a bit permitting the use of the FIFO
ABI, rather than a bit saying "oh actually, you can't use that".
That said, it might be easier to declare FIFO to be "event channel v2",
and specify max_{grant,evntchn}_ver instead.
I'm open to other suggestions as well.
~Andrew
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