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Re: [PATCH v2 4/7] xen/evtchn: modify evtchn_bind_interdomain to support static evtchn
- To: Rahul Singh <rahul.singh@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 22 Aug 2022 15:53:54 +0200
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- Cc: bertrand.marquis@xxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 22 Aug 2022 13:54:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19.08.2022 12:02, Rahul Singh wrote:
> Static event channel support will be added for dom0less domains. Modify
> evtchn_bind_interdomain to support static evtchn.
>
> It is necessary to have access to the evtchn_bind_interdomain function
> to do that, so make evtchn_bind_interdomain global and also make it
> __must_check.
>
> evtchn_bind_interdomain() always allocates the next available local
> port. Static event channel support for dom0less domains requires
> allocating a specified port. Modify the evtchn_bind_interdomain to
> accept the port number as an argument and allocate the specified port
> if available. If the port number argument is zero, the next available
> port will be allocated.
>
> evtchn_bind_interdomain() finds the local domain from "current->domain"
> pointer. evtchn_bind_interdomain() will be called from the XEN to create
> static event channel during domain creation. "current" pointer is not
> valid at that time, therefore modify the evtchn_bind_interdomain() to
> pass domain as an argument.
>
> Signed-off-by: Rahul Singh <rahul.singh@xxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
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