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Subject: Re: [PATCH v3 2/8] xen/events: don't unmask an event channel when an
 eoi is pending
To:     Juergen Gross <jgross@suse.com>, xen-devel@lists.xenproject.org,
        linux-kernel@vger.kernel.org
Cc:     Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Stefano Stabellini <sstabellini@kernel.org>,
        stable@vger.kernel.org
References: <20210219154030.10892-1-jgross@suse.com>
 <20210219154030.10892-3-jgross@suse.com>
From:   Julien Grall <julien@xen.org>
Message-ID: <66b1d440-2500-99fc-70a3-3d24d27f0334@xen.org>
Date:   Sat, 20 Feb 2021 12:10:28 +0000
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Hi Juergen,

On 19/02/2021 15:40, Juergen Gross wrote:
> An event channel should be kept masked when an eoi is pending for it.
> When being migrated to another cpu it might be unmasked, though.
> 
> In order to avoid this keep three different flags for each event channel
> to be able to distinguish "normal" masking/unmasking from eoi related
> masking/unmasking and temporary masking. The event channel should only
> be able to generate an interrupt if all flags are cleared.
> 
> Cc: stable@vger.kernel.org
> Fixes: 54c9de89895e0a36047 ("xen/events: add a new late EOI evtchn framework")
> Reported-by: Julien Grall <julien@xen.org>
> Signed-off-by: Juergen Gross <jgross@suse.com>

Reviewed-by: Julien Grall <jgrall@amazon.com>

Cheers,

-- 
Julien Grall