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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.02.15 at 14:32, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 17/02/15 12:36, Jan Beulich wrote:
>>>>> 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?
> 
> Trial and improvement, or find a manual for the affected system.

If such an address range would appear in a manual, it would
almost certainly also appear in the ACPI tables (unless by manual
you mean errata documentation).

Jan


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