Re: [Xen-devel] [PATCH RFC 5/5] pvh: dom0 boot option to specify iommu rw ranges

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 14.02.15 at 00:21, <elena.ufimtseva@xxxxxxxxxx> wrote:
> On Fri, Feb 13, 2015 at 10:09:39PM +0000, Andrew Cooper wrote:
>> If I understand the problem correctly, I believe that the correct
>> solution would be to add a dmar_rmrr[ command line parameter along the
>> same lines as ivrs_hpet[ and ivrs_ioapic[ which allows the user to
>> inject corrections to the ACPI tables via the command line.
> 
> Yes, if we agree to classify those magic locations as being not reported
> by ACPI machinery.

One fundamental problem for someone to use this proposed option
in practice is - how does(s)he learn which region(s) to specify?

Jan


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