Re: [Xen-devel] [PATCH 1/3] xen/tools: Add 64 bits big bar support

["Jan Beulich" <jbeulich@xxxxxxxx>]

>>> "Hao, Xudong" <xudong.hao@xxxxxxxxx> 08/22/12 3:03 AM >>>
>> > Where does present the 36-bit physical addresses limit, could you help to
>> > point out in the current Xen code?
>> 
>> Look at xen/arch/x86/hvm/mtrr.c, e.g. hvm_mtrr_pat_init() or
>> mtrr_var_range_msr_set().
>
> So if common 36-bit(guest) physical address could not change, can we use
> top down from 64G, Jan, do you have any suggestion? 

Sorry, I already said that I think the only viable option is top down from
top of physical address space. No new address space holes please if at
all possible - just do it in ways real firmware would do it (which would
unlikely alter the RAM layout for this purpose).

Jan


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