Re: [Xen-devel] [PATCH v2 18/30] xen/x86: setup PVHv2 Dom0 ACPI tables

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 10/27/2016 10:02 AM, Jan Beulich wrote:
> > > > On 27.10.16 at 15:51, <boris.ostrovsky@xxxxxxxxxx> wrote:
> > I re-read this thread and I am not sure I understand why we can't keep
> > host's RSDP descriptor. We are not mapping dom0 memory 1:1 (right?) so
> > we can place our versions of RSDT/XSDT at the address that the
> > descriptor points to.
> >
> > Unless that address is beyond dom0 memory allocation so that could be a
> > problem I guess.
> Also eventually we may want to add tables, not just remove some,
> and then there may not be enough space at the original location.
> Plus I think nothing precludes the XSDT living below 1Mb, and then
> we're back into the same problems discussed in another branch of
> this thread.
Yes, that is a problem.

I guess we will need to do something in Linux to override descriptor 
search. There is already some cruft for this but it appears to be 
kexec-specific.

-boris

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