Re: [Qemu-devel] [Xen-devel] [PATCH RFC v2 4/4] xen/MSI: re-expose masking capability

[Ian Campbell <ian.campbell@citrix.com>]

On Fri, 2015-12-11 at 16:44 +0000, Stefano Stabellini wrote:
>  
> It is not possible to do this at runtime. I think we should do this at
> compile time because in any case it is not supported to run a QEMU built
> for a given Xen version on a different Xen version.

I am currently working pretty hard to make this possible in the future, it
would be a shame to add another reason it wasn't possible at this stage.

I proposed (in <1445442435.9563.184.camel@citrix.com>) that as well as the
various stable libraries extracted from libxenctrl we will probably also
want to have a libxendevicemodel.so at some point, to provide a stable way
to interface with all the stuff which being a DM involves.

Maybe that library could contain a way to get this information? (In which
case it could be hardcoded at compile time now and I'll see what I can do
when I get to producing the library).

For the original issue here, could the flag be exposed as a
XEN_SYSCTL_PHYSCAP_????

Ian.