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Date: Mon, 20 Oct 2014 20:27:08 +0200
From: Jan Kiszka <jan.kiszka@siemens.com>
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Subject: Re: [Qemu-devel] [PATCH] intel_iommu: fix VTD_SID_TO_BUS
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: qemu-devel <qemu-devel@nongnu.org>, Le Tan <tamlokveer@gmail.com>, Anthony Liguori <aliguori@amazon.com>, Markus Armbruster <armbru@redhat.com>

On 2014-10-20 19:20, Michael S. Tsirkin wrote:
> On Mon, Oct 20, 2014 at 04:37:15PM +0200, Jan Kiszka wrote:
>> On 2014-10-20 16:23, Michael S. Tsirkin wrote:
>>>
>>> WRT intel_iommu, it does not yet seem to be as fully functional as I
>>> hoped.
>>
>> What is missing or broken?
> 
> PCI to PCI bridges don't work, do they?

Knut had an answer, but there was something, right.

> 
>>>  People also discussed the best way to handle virtio versus iommu
>>> (it bypasses it ATM).
>>
>> We need to declare in the ACPI tables that the emulated IOMMUs do not
>> cover those "special" virtio devices.
> 
> I'd also be fine if we flat out disallow adding virtio
> devices to such systems for now, or anything else that
> does not work.

I wouldn't (heavily used in my test setups).

> Patches for either approach aren't yet available, are they?

If no one else is quicker, I'll look into the ACPI tables.

Jan

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