lkml.org 
[lkml]   [2018]   [Jan]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v3 03/16] iommu: introduce iommu invalidate API function
From
Date
On 28/12/17 19:25, Jacob Pan wrote:
[...]
>>> + * @size: 2^size of 4K pages, 0 for 4k, 9 for 2MB,
>>> etc.
>>
>> Having only power of two invalidation seems too restrictive for a
>> software interface. You might have the same problem as above, where
>> the guest or userspace needs to send lots of invalidation requests,
>> They could be multiplexed by passing an arbitrary range instead. How
>> about making @size a __u64?
>>
> Sure if you have such need for non power of two. So it will be __u64 of
> 4k pages?

4k granule would work for us right now, but other architectures may plan
to support arbitrary sizes. The map/unmap API does support arbitrary
sizes, so it might be better to have a byte granularity in @size.

Thanks,
Jean

\
 
 \ /
  Last update: 2018-01-14 23:21    [W:0.146 / U:0.080 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site