linux-kernel - Re: [PATCH] rdma: don't make pages writeable if not requiested

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Date:	Thu, 21 Mar 2013 11:21:50 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Roland Dreier <roland@...nel.org>,
	"Michael R. Hines" <mrhines@...ux.vnet.ibm.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Yishai Hadas <yishaih@...lanox.com>,
	Christoph Lameter <cl@...ux.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, qemu-devel@...gnu.org
Subject: Re: [PATCH] rdma: don't make pages writeable if not requiested

On Thu, Mar 21, 2013 at 07:15:25PM +0200, Michael S. Tsirkin wrote:

> No because application does this:
> init page
> 
> ...
> 
> after a lot of time
> 
> ..
> 
> register
> send
> unregister
> 
> so it can not be read only.

mprotect(READONLY)
register
send
unregister
mprotect(WRITABLE)

?

With something like GIFT the app already has to give up writing to the
pages while they are moving, so changing the protection seems in line
with that?

Jason
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