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Re: [Xen-devel] [PATCH RFC 09/13] xen: change quality of the MADT ACPI enumerator

On Thursday, February 13, 2014 8:49:24 pm Andrew Cooper wrote:
> On 08/02/2014 21:42, John Baldwin wrote:
> > On Tuesday, December 24, 2013 12:20:58 PM Roger Pau Monne wrote:
> >> Lower the quality of the MADT ACPI enumerator, so on Xen Dom0 we can
> >> force the usage of the Xen mptable enumerator even when ACPI is
> >> detected.
> > Hmm, so I think one question is why does the existing MADT parser
> > not work with the MADT table provided by Xen?  This may very well
> > be correct, but if it's only a small change to make the existing
> > MADT parser work with Xen's MADT table, that route might be
> > preferable.
> >
> For dom0, the MADT seen is the system MADT, which does not bear any
> reality to dom0's topology.  For PV domU, no MADT will be found.  For
> HVM domU, the MADT seen ought to represent (virtual) reality.

Hmm, the other changes suggested that you do want to use the I/O APIC
entries and interrupt overrides from the system MADT for dom0?  Just
not the CPU entries.  Is that correct?

John Baldwin

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