On 04/03/2013 01:32:26 PM, Stuart Yoder wrote:
On Tue, Apr 2, 2013 at 5:50 PM, Scott Wood <scottwood@xxxxxxxxxxxxx>
wrote:
> On 04/02/2013 04:38:45 PM, Alex Williamson wrote:
>>
>> On Tue, 2013-04-02 at 16:08 -0500, Stuart Yoder wrote:
>> > VFIO_IOMMU_MAP_MSI(iova, size)
>
>
> Not sure how you mean "size" to be used -- for MPIC it would be 4K
per bank,
> and you can only map one bank at a time (which bank you're mapping
should be
> a parameter, if only so that the kernel doesn't have to keep
iteration state
> for you).
The intent was for user space to tell the kernel which windows to use
for MSI. So I envisioned a total size of window-size *
msi-bank-count.
Size doesn't tell the kernel *which* banks to use, only how many. If
it already knows which banks are used by the group, then it also knows
how many are used. And size is misleading because the mapping is not
generally going to be contiguous.
-Scott
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