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xen-devel
Re: [Xen-devel] I cannot get any message from domU by console / pv_ops d
On Tue, 2009-12-22 at 15:47 +0000, Konrad Rzeszutek Wilk wrote:
> > I thought it used to be that you could only (successfully) make order>0
> > increase_reservation or mem_exchange hypercalls if you had I/O
> > privileges? Has this changed?
>
> I am looking at the 3.4 code I am not seeing any I/O privileges check.
>
> I did not even know that those existed actually - could you give me an idea
> when was the last time you saw it?
In xen-unstable multipage_allocation_permitted is called from
memory_exchange() and increase_reservation() and is defined as
#define multipage_allocation_permitted(d, order) \
(((order) <= 9) || /* allow 2MB superpages */ \
!rangeset_is_empty((d)->iomem_caps) || \
!rangeset_is_empty((d)->arch.ioport_caps))
The ((order) <= 9) || is new and isn't present in the 3.4 tree,
previously you would have had to add a passthrough device to cause one
of the other rangesets to become non-empty.
Ian.
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