linux-kernel - Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux

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Message-ID: <55F6DDB4.5000403@citrix.com>
Date:	Mon, 14 Sep 2015 15:46:12 +0100
From:	Julien Grall <julien.grall@...rix.com>
To:	Roger Pau Monné <roger.pau@...rix.com>,
	<xen-devel@...ts.xenproject.org>
CC:	<wei.liu2@...rix.com>, <ian.campbell@...rix.com>,
	<konrad.wilk@...cle.com>, <stefano.stabellini@...citrix.com>,
	<linux-kernel@...r.kernel.org>, <david.vrabel@...rix.com>,
	<boris.ostrovsky@...cle.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux

On 14/09/15 15:29, Roger Pau Monné wrote:
>> To give you an example, Centos 7, which will support Xen and only 64KB
>> page granularity, will be supported for years. Dropping any splitting in
>> a short future (3-5 years) will just break those guests to boot on Xen.
> 
> Can't the patches to support 64KB grants be backported to CentOS? In the
> past you said that distros had no problem in picking the needed Xen
> patches for 64KB support, I don't see how that would be different.

Centos 7 is not yet released so it's more easy to get patch in. I don't
know what will be position when the guest is shipped.

I bet they will still want to support 64KB with older Xen (i.e where
64KB grant is not supported).

Anyway, I don't expect to see the 64KB grants support before next year
as my TODO list is already pretty full. So let's talk about it when I
(or someone else) will send an RFC to extend the grant size.

Regards,

-- 
Julien Grall
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