From: Julien Grall <julien@xen.org>
To: Jens Wiklander <jens.wiklander@linaro.org>,
Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>
Cc: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
Stefano Stabellini <sstabellini@kernel.org>
Subject: Re: [PATCH v2 2/2] xen/arm: add FF-A mediator
Date: Fri, 17 Jun 2022 09:16:50 +0100 [thread overview]
Message-ID: <94122e8d-224d-2632-27ad-d56d3a24b367@xen.org> (raw)
In-Reply-To: <20220616223728.GA71444@jade>
Hi Jens,
On 16/06/2022 23:37, Jens Wiklander wrote:
> On Tue, Jun 14, 2022 at 07:47:18PM +0000, Volodymyr Babchuk wrote:
>>
>> Hello Jens,
>>
>> Sorry for late review, I was busy with internal projects.
>>
>> This is preliminary review. I gave up at scatter-gather operations. Need
>> more time to review them properly.
>
> No problem, thanks for taking the time.
>
>>
>> One thing that bothers me is that Xen is non-preemptive and there are
>> plenty potentially long-running operations.
>
> There's room to deal with that in the FF-A specification. These scatter
> gather operation are quite complicated so I started with the minimum. We
> can as a future optimization address the problem with long running
> operations.
I would be OK to defer this work. However, I think this should be
written down as Xen community will not be able to security support until
we resolved the known places where a vCPU may hog pCPU longer than
necessary.
This reminds me that this series doesn't add a support statement for the
new subsystem in SUPPORT.md. AFAICT, this should be tech preview for now.
Cheers,
--
Julien Grall
next prev parent reply other threads:[~2022-06-17 8:17 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-09 6:18 [PATCH v2 0/2] Xen FF-A mediator Jens Wiklander
2022-06-09 6:18 ` [PATCH v2 1/2] xen/arm: smccc: add support for SMCCCv1.2 extended input/output registers Jens Wiklander
2022-06-11 0:41 ` Stefano Stabellini
2022-06-11 9:41 ` Julien Grall
2022-06-13 23:18 ` Stefano Stabellini
2022-06-15 15:58 ` Jens Wiklander
2022-06-15 19:01 ` Julien Grall
2022-06-15 22:09 ` Jens Wiklander
2022-06-16 15:13 ` Julien Grall
2022-06-15 19:43 ` Julien Grall
2022-06-16 0:09 ` Stefano Stabellini
2022-06-09 6:18 ` [PATCH v2 2/2] xen/arm: add FF-A mediator Jens Wiklander
2022-06-11 1:23 ` Stefano Stabellini
2022-06-11 9:08 ` Julien Grall
2022-06-13 23:18 ` Stefano Stabellini
2022-06-16 18:05 ` Jens Wiklander
2022-06-14 19:47 ` Volodymyr Babchuk
2022-06-15 18:15 ` Julien Grall
2022-06-16 22:37 ` Jens Wiklander
2022-06-17 8:16 ` Julien Grall [this message]
2022-06-20 13:05 ` Jens Wiklander
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