Re: [Xen-devel] <summary-1> (v2) Design proposal for RMRR fix

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Ian Campbell [mailto:Ian.Campbell@xxxxxxxxxx]
> Sent: Monday, January 12, 2015 9:42 PM
> 
> On Fri, 2015-01-09 at 06:57 +0000, Tian, Kevin wrote:
> > 3) report-sel vs. report-all
> 
> One thing I'm not clear on is whether you are suggesting to reserve RMRR
> (either -all or -sel) for every domain by default, or whether the guest
> CFG will need to explicitly opt-in, IOW is there a 3rd report-none
> option which is the default unless otherwise requested (e.g. by
> e820_host=1, or some other new option)?

only when a device is assigned (or potentially prepare for hotplug usage),
and report-all/sel is from hypervisor p.o.v to tell userspace about all RMRR
regions on this platform or just RMRR regions belonging to specified devices.
'e820_host' only makes holes to prepare (more than RMRR requires). finally 
we still need query actual reserved regions reported by hypervisor and 
then mark them reserved in guest e820 table and avoid conflict for PCI BAR 
allocation etc. 

Thanks
Kevin
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