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Subject: Re: [PATCH] xen/events: reset active flag for lateeoi events later
To:     Ross Lagerwall <ross.lagerwall@citrix.com>,
        xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org
Cc:     Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Stefano Stabellini <sstabellini@kernel.org>,
        Julien Grall <julien@xen.org>
References: <20210623130913.9405-1-jgross@suse.com>
 <41f6aeaa-583f-9b00-7789-d8a6f751b49d@citrix.com>
From:   Juergen Gross <jgross@suse.com>
Message-ID: <f8f83223-061c-84cf-41c6-cc64e8aedfcc@suse.com>
Date:   Mon, 5 Jul 2021 11:16:43 +0200
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From: Juergen Gross <jgross@suse.com>
To: Ross Lagerwall <ross.lagerwall@citrix.com>,
 xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>,
 Stefano Stabellini <sstabellini@kernel.org>, Julien Grall <julien@xen.org>
Message-ID: <f8f83223-061c-84cf-41c6-cc64e8aedfcc@suse.com>
Subject: Re: [PATCH] xen/events: reset active flag for lateeoi events later
References: <20210623130913.9405-1-jgross@suse.com>
 <41f6aeaa-583f-9b00-7789-d8a6f751b49d@citrix.com>
In-Reply-To: <41f6aeaa-583f-9b00-7789-d8a6f751b49d@citrix.com>

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On 05.07.21 11:00, Ross Lagerwall wrote:
> On 2021-06-23 14:09, Juergen Gross wrote:
>> In order to avoid a race condition for user events when changing
>> cpu affinity reset the active flag only when EOI-ing the event.
>>
>> This is working fine as all user events are lateeoi events. Note that
>> lateeoi_ack_mask_dynirq() is not modified as there is no explicit call=

>> to xen_irq_lateeoi() expected later.
>>
>> Reported-by: Julien Grall <julien@xen.org>
>> Fixes: b6622798bc50b62 ("xen/events: avoid handling the same event on =
two cpus at the same time")
>> Tested-by: Julien Grall <julien@xen.org>
>> Signed-off-by: Juergen Gross <jgross@suse.com>
>> ---
>=20
> Hi Juergen,
>=20
> Are you planning on backporting this fix to releases <=3D 5.10?

It is on my todo list. :-)


Juergen

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