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

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Message-ID: <5EB0D195-8DEF-4817-89DC-62BAEB888720@arm.com>
Date:   Thu, 27 Jul 2023 08:27:22 +0000
From:   Rahul Singh <Rahul.Singh@....com>
To:     Juergen Gross <jgross@...e.com>
CC:     Xen-devel <xen-devel@...ts.xenproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        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

HI Juergen,

> On 27 Jul 2023, at 6:54 am, Juergen Gross <jgross@...e.com> wrote:
> 
> 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

Thanks.

Regards,
Rahul