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Re: [Xen-devel] [RFC][PATCH v1] xen-fbfront: replace deferred io with buffer queue

On Mon, 19 Jan 2015, Sergiy Kibrik wrote:
> On 1/19/2015 3:25 PM, Stefano Stabellini wrote:
> >> This doesn't sound like a secure interface: a potentially very
> >> > significant and unbound memory allocation in dom0 is caused by a
> >> > parameter configured by the guest.
> >  
> > Sorry, I realize now that fortunately it is the other way around.
> > It would be nice to see a correspondent patch for xenfb (the backend).
> > Who configures num_bufs initially in your system?
> > 
> AFAIK there's no backend code in xen-4.x tree anymore, I found it in
> old releases. But I'll find a way to present backend as well.

The backend is in QEMU: hw/display/xenfb.c.

> num_bufs should be set by xl tool according to domain config file, but
> we don't have patch for xl yet (it's done manually via xenstore-write in
> our setup. Fairly ugly)

OK, we need that patch :-)

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