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Re: [Qemu-devel] [PATCH 14/27] iommu: Add IOMMU index concept to IOMMU A

From: Auger Eric
Subject: Re: [Qemu-devel] [PATCH 14/27] iommu: Add IOMMU index concept to IOMMU API
Date: Tue, 22 May 2018 16:22:48 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

On 05/22/2018 04:19 PM, Peter Maydell wrote:
> On 22 May 2018 at 15:11, Auger Eric <address@hidden> wrote:
>> Hi Peter,
>> On 05/22/2018 03:22 PM, Peter Maydell wrote:
>>> How many substream IDs do we expect to see in practice?
>> Spec says max 20 bits, matching the max size of the PASID
> Right, but do we actually expect to see transactions from
> devices that use the whole 2^20 possible values, or will
> they in practice mostly use 1..5, or somethnig else?

An example given in the spec mentions 8.

"An example would be a compute accelerator with 8 contexts that might
each map to a different user process, but where the single device has
common configuration meaning it must be assigned to a VM whole."


> thanks
> -- PMM

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