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Re: [Qemu-devel] Question on Qemu IOAPIC ID


From: Jan Kiszka
Subject: Re: [Qemu-devel] Question on Qemu IOAPIC ID
Date: Sat, 30 Jul 2016 09:41:31 +0200
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On 2016-07-23 10:12, David Kiarie wrote:
> Hello all,
> 
> I, working on AMD IOMMU interrupt remapping would like to ask some
> questions on Qemu IOAPIC id.
> 
> I currently have a problem in that Linux AMD IOMMU driver expects at least
> one IOAPIC on the chipset to have ID 0xa0 while Qemu IOAPIC id is always 0.
> I am faced with two options
>    -Change IOAPIC id so that it always matches what Linux AMD IOMMU driver
> expects. In this case I am not sure which problems I could encounter with
> this approach.
>    -Have a way to configure IOAPIC ID based on emulated IOMMU.
> 
> I prefer the first approach since it's quite simple but would like to hear
> other opinions regarding this issue.
> 
> David.
> 

Ping on this question by David:

If we can consolidate over AMD's IOAPIC ID now, before releasing 4.7
(later changes would be guest visible), we won't have to add a special
case for the AMD IOMMU later.

Jan

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