Re: [Xen-devel] how to assign resources exclusive to a single domU

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Fri, 2015-02-27 at 09:19 +0100, Olaf Hering wrote:
> On Fri, Feb 27, JÃrgen Groà wrote:
> 
> > On 02/26/2015 09:57 AM, Olaf Hering wrote:
> > >I wonder what should be done in my changes for libxl.
> > If you are doing something, please add a flag to be able to disable
> > the additional security checks regarding multiple assignment.
> 
> I think libxl should just allow multiple assignments of physical
> devices. Its up to the admin to make sure the overall config is sane.

I can't remember what libxl does today but WRT disks (with the phy
backend at least) xend used to have sharing checks and refuse to allow
sharing (for writeable disks) unless overridden (by "w+" in the mode
string, IIRC).

I don't think libxl implements those checks, so the override isn't
supported, but maybe it would be good to do so, and maybe it would be a
good idea for pvscsi to at least be consistent with what we might
eventually do for disks?

(FWIW I think most of the checks were actually in the block-* scripts,
I'm not sure why they are active under libxl)

Ian.


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