linux-kernel - RE: [PATCH V3 2/4] misc: vop: do not allocate and reassign the used ring

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Message-ID: <VI1PR04MB49603783EF3FD3F3635FCDAF92170@VI1PR04MB4960.eurprd04.prod.outlook.com>
Date:   Wed, 28 Oct 2020 01:47:49 +0000
From:   Sherry Sun <sherry.sun@....com>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>
CC:     "sudeep.dutt@...el.com" <sudeep.dutt@...el.com>,
        "ashutosh.dixit@...el.com" <ashutosh.dixit@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "arnd@...db.de" <arnd@...db.de>, "kishon@...com" <kishon@...com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V3 2/4] misc: vop: do not allocate and reassign the used
 ring

Hi Vincent,

> Subject: Re: [PATCH V3 2/4] misc: vop: do not allocate and reassign the used
> ring
> 
> On Tue, Oct 27, 2020 at 08:05:43AM +0100, Sherry Sun wrote:
> > Can you help test the patch about removing the codes of reassign used
> > ring, and comment on the impact for Intel MIC platform?  Thanks for
> > any help.
> 
> I don't have access to MIC hardware myself, either.
> 
> But this patch is quite certainly going to break it since guests using a kernel
> without the patch will not work with hosts with a kernel with the patch.

Thanks for your reply.
This patch can be used by both guests and hosts.
I have tested it on imx8qm platform(both guest and host are ARM64 architecture), and it works well.
So I guess Intel MIC won't meet big problems when both guest and host apply this patch. But it is best if it can be tested.

Best regards
Sherry