Re: [Xen-devel] Re: userspace block backend / gntdev problems

[Markus Armbruster <armbru@xxxxxxxxxx>]

Pat Campbell <plc@xxxxxxxxxx> writes:

[...]
> In my latest post on "Dynamic modes support for PV xenfb" I am using
> grants to map an extended framebuffer. I have a single grant ref that
> points to 10 other refs. The other refs contain MFNs. Same technique as
> the current framebuffer pd array but avoids the 64bit long issue. Kind
> of a hybrid approach. I am able to map a 22MB framebuffer when running a
> 64 bit guest and 44MB when running a 32 bit guest. When the backend is
> done with the mapping it sends a message to the frontend to free up the
> refs.

Uhm, I fear I didn't get the advantage of your hybrid approach.  Could
you explain?

> I did try to map the whole framebuffers via grants, failed. Like you say
> you need a whole bunch of them.

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