linux-kernel - Re: [PATCH v3 2/2] xen: modify kernel mappings corresponding to granted pages

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Date:	Wed, 07 Sep 2011 12:05:18 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	Ian Campbell <Ian.Campbell@...citrix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH v3 2/2] xen: modify kernel mappings corresponding to granted
 pages

On 09/07/2011 10:38 AM, Stefano Stabellini wrote:
>
>> But also, this pattern of getting results back from batched calls is
>> unusual - actually, I think this is unique.  If you have batched up a
>> map operation which has its map_op args allocated from the multicall
>> buffer, then the flush will implicitly free them as well, so it isn't
>> valid to read back from the structure later on.  If you want to have an
>> args structure you can use once the hypercall has been issued, you need
>> to manually manage its lifetime.
> But I am not using the multicall buffer as argument, I am using the
> kmap_op passed to m2p_add_override.

Yep, I overlooked that.

    J
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