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

[Peter Maydell]

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?

thanks
-- PMM