From: Juergen Gross <jgross@suse.com>
To: Viresh Kumar <viresh.kumar@linaro.org>,
Stefano Stabellini <sstabellini@kernel.org>,
Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Cc: "Vincent Guittot" <vincent.guittot@linaro.org>,
"Alex Bennée" <alex.bennee@linaro.org>,
stratos-dev@op-lists.linaro.org,
"Erik Schilling" <erik.schilling@linaro.org>,
"Manos Pitsidianakis" <manos.pitsidianakis@linaro.org>,
"Mathieu Poirier" <mathieu.poirier@linaro.org>,
"Arnd Bergmann" <arnd@kernel.org>,
xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH V4 3/4] xen: evtchn: Allow shared registration of IRQ handers
Date: Mon, 16 Oct 2023 09:17:48 +0200 [thread overview]
Message-ID: <109e682d-c257-47b9-9d95-ba927cae46db@suse.com> (raw)
In-Reply-To: <99b1edfd3147c6b5d22a5139dab5861e767dc34a.1697439990.git.viresh.kumar@linaro.org>
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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@linaro.org>
Reviewed-by: Juergen Gross <jgross@suse.com>
Juergen
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next prev parent reply other threads:[~2023-10-16 7:17 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-16 7:11 [PATCH V4 0/4] xen: privcmd: Add ioeventfd and fix irqfd support Viresh Kumar
2023-10-16 7:11 ` [PATCH V4 1/4] xen: Make struct privcmd_irqfd's layout architecture independent Viresh Kumar
2023-10-16 7:13 ` Juergen Gross
2023-10-16 7:11 ` [PATCH V4 2/4] xen: irqfd: Use _IOW instead of the internal _IOC() macro Viresh Kumar
2023-10-16 7:14 ` Juergen Gross
2023-10-16 7:11 ` [PATCH V4 3/4] xen: evtchn: Allow shared registration of IRQ handers Viresh Kumar
2023-10-16 7:17 ` Juergen Gross [this message]
2023-10-16 7:11 ` [PATCH V4 4/4] xen: privcmd: Add support for ioeventfd Viresh Kumar
2023-10-16 7:25 ` Juergen Gross
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