Re: [PATCH v2 4/7] xen/evtchn: modify evtchn_bind_interdomain to support static evtchn

From: Jan Beulich <jbeulich@suse.com>
To: Rahul Singh <rahul.singh@arm.com>
Cc: bertrand.marquis@arm.com,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	George Dunlap <george.dunlap@citrix.com>,
	Julien Grall <julien@xen.org>,
	Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wl@xen.org>,
	xen-devel@lists.xenproject.org
Subject: Re: [PATCH v2 4/7] xen/evtchn: modify evtchn_bind_interdomain to support static evtchn
Date: Mon, 22 Aug 2022 15:53:54 +0200	[thread overview]
Message-ID: <1c669d36-0cb8-53a7-3fea-1caf06b7d363@suse.com> (raw)
In-Reply-To: <abe4c5be55125eb3da33dbd187fd9b8ad5ace714.1660902588.git.rahul.singh@arm.com>

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@arm.com>

Acked-by: Jan Beulich <jbeulich@suse.com>