Re: [Xen-devel] [PATCH 2/2] hvmloader: don't hard-code IO-APIC parameters

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 16.06.16 at 18:49, <boris.ostrovsky@xxxxxxxxxx> wrote:
> On 06/16/2016 05:40 AM, Jan Beulich wrote:
>> The IO-APIC address has variable bits determined by the PCI-to-ISA
>> bridge, and the IO-APIC version should be read from the IO-APIC. (Note
>> that there's still implicit rather than explicit agreement on the
>> IO-APIC base address between qemu and the hypervisor.)
> 
> It probably doesn't matter now for PVHv2 since we are not going to
> initially emulate IOAPIC but when/if we do, how do we query for base
> address and version? Should we just rely on the same implicit agreement?

If this refers to the sentence in parentheses, then this was really
meant to indicate a work item. I.e. qemu should negotiate with
Xen. For PVHv2 this would then probably mean for hvmloader to
query Xen (via new hypercall).

Jan


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