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Re: [Xen-devel] [PATCH RFC 2/4] x86/dom0: prevent PVH Dom0 from mapping read-only the IO APIC area

>>> On 30.06.17 at 17:34, <roger.pau@xxxxxxxxxx> wrote:
> On Fri, Jun 30, 2017 at 05:31:36AM -0600, Jan Beulich wrote:
>> >>> Roger Pau Monne <roger.pau@xxxxxxxxxx> 04/24/17 1:52 PM >>>
>> >This is emulated by Xen and must not be mapped into PVH Dom0 p2m.
>> Yes, but this reminds of of the reason we permit the r/o mapping in PV
>> Dom0, and I wonder how well the emulated variant is going to work with
>> ACPI methods accessing the IO-APICs. Let's hope there's not going to
>> be any problems.
> Won't ACPI be satisfied by accessing the emulated vIO APIC? That's
> available, and should reflect the real IO APIC state in most cases
> (except for GSIs in use by Xen).

This "most cases" is what I'm not sufficiently happy with; hence the
"let's hope ...".


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