Re: [Xen-devel] (v2) Design proposal for RMRR fix

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 09.01.15 at 03:29, <kevin.tian@xxxxxxxxx> wrote:
>>  From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> Sent: Thursday, January 08, 2015 8:59 PM
>> 
>> >>> On 08.01.15 at 13:49, <George.Dunlap@xxxxxxxxxxxxx> wrote:
>> > One question: where are these RMRRs typically located in memory?  Are
>> > they normally up in the MMIO region?  Or can they occur anywhere (even
>> > in really low areas, say, under 1GiB)?
>> 
>> They would typically sit in the MMIO hole or below 1Mb; that latter case
>> is particularly problematic as it might conflict with what we want to put
>> there (BIOS etc).
>> 
> 
> and later case is not solvable, which is then related to other discussion 
> whether
> we want to fail such case

That latter case is partially solvable: The BIOS put below 1Mb has a
permanent and a transient part. Dealing with the transient part
overlapping an RMRR ought to be possible (e.g. by delaying the
actual device assignment until the point where hvmloader knows it
is safe to do). An overlap of the permanent part with an RMRR is of
course fatal.

Jan


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