Re: [Xen-devel] [PATCH v5 7/9] ioreq-server: remove p2m entries when server is enabled

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Ian Campbell
> Sent: 06 May 2014 11:48
> To: Paul Durrant
> Cc: xen-devel@xxxxxxxxxxxxx; Ian Jackson; Stefano Stabellini; Jan Beulich
> Subject: Re: [PATCH v5 7/9] ioreq-server: remove p2m entries when server is
> enabled
> 
> On Thu, 2014-05-01 at 13:08 +0100, Paul Durrant wrote:
> > For secondary servers, add a hvm op to enable/disable the server. The
> > server will not accept IO until it is enabled and the act of enabling
> > the server removes its pages from the guest p2m, thus preventing the
> guest
> > from directly mapping the pages and synthesizing ioreqs.
> 
> Does the ring get reset when the server is enabled? Otherwise what
> prevents the guest from preloading something before the ring is
> activated?
> 

Good point. For secondary emulators the ioreq pages should be reset.

  Paul

> In terms of the tools side binding of the interface this looks fine to me.
> 
> Ian.

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