From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <Ian.Campbell@citrix.com>
Subject: Re: Fatal crash on xen4.2 HVM + qemu-xen dm + NFS
Date: Mon, 21 Jan 2013 17:32:54 +0000
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To: Alex Bligh <alex@alex.org.uk>
Cc: Konrad Wilk <konrad.wilk@oracle.com>, Xen Devel <xen-devel@lists.xen.org>, Jan Beulich <JBeulich@suse.com>, Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
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On Mon, 2013-01-21 at 17:31 +0000, Alex Bligh wrote:
> 
> --On 21 January 2013 16:51:13 +0000 Ian Campbell <Ian.Campbell@citrix.com> 
> wrote:
> 
> >> Right, and I'm pretty sure we're not using O_DIRECT as we're using
> >> cache=writeback (which is the default). Is there some way to make it
> >> copy pages?
> >
> > Not as far as I know,
> 
> A thought: would it be possible for testing purposes to replace
> the grant-map by a grant-copy? How easy would that be? Would that
> not provide a page with the same lifecycle as a normal dom0 allocated
> one?

You would also need to malloc/free the buffer you are copying to/from. I
don't know how hard that is within qemu.

Ian.