linux-kernel - Re: [PATCH V4 3/4] xen: evtchn: Allow shared registration of IRQ handers

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Date:   Mon, 16 Oct 2023 09:17:48 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        Alex Bennée <alex.bennee@...aro.org>,
        stratos-dev@...lists.linaro.org,
        Erik Schilling <erik.schilling@...aro.org>,
        Manos Pitsidianakis <manos.pitsidianakis@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Arnd Bergmann <arnd@...nel.org>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4 3/4] xen: evtchn: Allow shared registration of IRQ
 handers

On 16.10.23 09:11, Viresh Kumar wrote:
> Currently the handling of events is supported either in the kernel or
> userspace, but not both.
> 
> In order to support fast delivery of interrupts from the guest to the
> backend, we need to handle the Queue notify part of Virtio protocol in
> kernel and the rest in userspace.
> 
> Update the interrupt handler registration flag to IRQF_SHARED for event
> channels, which would allow multiple entities to bind their interrupt
> handler for the same event channel port.
> 
> Also increment the reference count of irq_info when multiple entities
> try to bind event channel to irqchip, so the unbinding happens only
> after all the users are gone.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen


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