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

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Feb 17, 2015 at 02:14:20PM +0000, Andrew Cooper wrote:
> On 17/02/15 13:39, Jan Beulich wrote:
> >>>> 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
> 
> In an ideal world.
> 
> > (unless by manual you mean errata documentation).
> 
> Also a valid source of information.

The way Elena found it is by looking at the EPT violations. Perhaps
that should be also mentioned in the Documentation for said parameter?

> 
> ~Andrew
> 
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