linux-kernel - Re: [PATCH V3 1/2] xen: Update dm

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Date:   Tue, 25 Jul 2023 09:49:51 +0200
From:   Jan Beulich <jbeulich@...e.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
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>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
Subject: Re: [PATCH V3 1/2] xen: Update dm_op.h from Xen public header

On 25.07.2023 09:42, Viresh Kumar wrote:
> On 25-07-23, 09:18, Jan Beulich wrote:
>> I question that use, btw, but it is not up to me to decide whether to
>> accept such a layering violation in Linux. dm-op is, as its name says,
>> for device models to use. Your intended use doesn't fall in that
>> category, aiui. Imo the present contents of dm_op.h in Linux is indeed
>> all a kernel is supposed to know about, unless it was to gain in-kernel
>> device models.
> 
> Is there any other way by which an interrupt can be raised for the
> guest VM ? I was only aware of this method and so implemented it like
> this.
> 
> I am open to suggestions on this.

Well. I don't know your requirements. Generally I would suggest using
event channels, not interrupts, when talking about injecting events
into guests. If it strictly needs to be an interrupt, then I guess a
non-dm-op means would need introducing if none already exists.

Jan