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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [rfc 00/18] ioemu: use devfn instead of slots as the unit for passthrough
On 04/03/2009 22:26, "Simon Horman" <horms@xxxxxxxxxxxx> wrote: >> Please note that _PRT method in ACPI AML should reflect GSIs. If you expand >> GSIs, it will be necessary to change the _PRT method. Please see >> tools/firmware/hvmloader/acpi/dsdt.asl. > > Could someone explain why the current code uses 32 GSIs rather than using 128? 32 should be plenty, and I'd want to emulate multiple IO-APICs beyond that just out of fear that some OS will choke on an IO-APIC with 128 pins (since no real single IO-APIC has so many pins). It just seemed a bit unnecessary when this support was originally implemented. At this point I haven't heard any concrete evidence so far that 32 GSIs is insufficient in any real scenario. So that's what we'll be sticking with for the time being, I think. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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