Re: [Qemu-devel] [Xen-devel] [PATCH v4] Hvmloader: Modify ACPI to only supply _EJ0 methods for PCIslots that support hotplug by runtime patching

[Ian Campbell]

On Mon, 2014-05-12 at 10:14 +0100, Jan Beulich wrote:
> >>> On 12.05.14 at 11:05, <address@hidden> wrote:
> > Given that there are 32 PCI slots we would be talking about a total of
> > 4k of space in hvmloader to provide a precompiled SSDT for each slot,
> > which can be inserted at runtime depending on each slots configuration.
> 
> 32 slots only? Are we unable to have anything on buses 1 and up?

I was basing this on mk_dsdt.c:
        /* hotplug_slot */
        for (slot = 1; slot <= 31; slot++) {

I suppose today we can have other PCI devices, just not hotpluggable.
But I suppose you are right than in the future we might want to
implement more hotplug slots, which would certainly affect the tradeoff
of dynamic vs. static SSDT generation.

Ian.