linux-kernel - Re: [PATCH v3] xen/evtchn: Introduce new IOCTL to bind static evtchn

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Message-ID: <270ed8f7-c645-502e-39c5-c93823037b9c@suse.com>
Date:   Thu, 27 Jul 2023 07:54:48 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Rahul Singh <rahul.singh@....com>, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org
Cc:     Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Jane Malalane <jane.malalane@...rix.com>
Subject: Re: [PATCH v3] xen/evtchn: Introduce new IOCTL to bind static evtchn

On 18.07.23 13:31, Rahul Singh wrote:
> Xen 4.17 supports the creation of static evtchns. To allow user space
> application to bind static evtchns introduce new ioctl
> "IOCTL_EVTCHN_BIND_STATIC". Existing IOCTL doing more than binding
> that’s why we need to introduce the new IOCTL to only bind the static
> event channels.
> 
> Static evtchns to be available for use during the lifetime of the
> guest. When the application exits, __unbind_from_irq() ends up being
> called from release() file operations because of that static evtchns
> are getting closed. To avoid closing the static event channel, add the
> new bool variable "is_static" in "struct irq_info" to mark the event
> channel static when creating the event channel to avoid closing the
> static evtchn.
> 
> Also, take this opportunity to remove the open-coded version of the
> evtchn close in drivers/xen/evtchn.c file and use xen_evtchn_close().
> 
> Signed-off-by: Rahul Singh <rahul.singh@....com>

Pushed to xen/tip.git for-linus-6.5a


Juergen


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