Re: [Xen-devel] [PATCH v4 7/8] ioreq-server: make buffered ioreq handling optional

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2014-04-02 at 16:11 +0100, Paul Durrant wrote:
> Some emulators will only register regions that require non-buffered
> access. (In practice the only region that a guest uses buffered access
> for today is the VGA aperture from 0xa0000-0xbffff). This patch therefore
> makes allocation of the buffered ioreq page and event channel optional for
> secondary ioreq servers.
> 
> If a guest attempts buffered access to an ioreq server that does not
> support it, the access will be handled via the normal synchronous path.

In terms of the guest PFN space do the magic PFNs get packed together or
are there holes? (Mostly just curious...)



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