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Re: [PATCH] xen/events: reset active flag for lateeoi events later
- To: Juergen Gross <jgross@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
- From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- Date: Wed, 23 Jun 2021 19:18:36 -0400
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>
- Delivery-date: Wed, 23 Jun 2021 23:19:11 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 6/23/21 9:09 AM, 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@xxxxxxx>
> Fixes: b6622798bc50b62 ("xen/events: avoid handling the same event on two
> cpus at the same time")
> Tested-by: Julien Grall <julien@xxxxxxx>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrvsky@xxxxxxxxxx>
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