[lkml]   [2017]   [Nov]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 21/23] x86, pcid, kaiser: allow flushing for future ASID switches
On 11/01/2017 01:03 AM, Andy Lutomirski wrote:
>> This ensures that any futuee context switches will do a full flush
>> of the TLB so they pick up the changes.
> I'm convuced. What was wrong with the old code? I guess I just don't
> see what the problem is that is solved by this patch.

Instead of flushing *now* with INVPCID, this lets us flush *later* with
CR3. It just hijacks the code that you already have that flushes CR3
when loading a new ASID by making all ASIDs look new in the future.

We have to load CR3 anyway, so we might as well just do this flush then.

 \ /
  Last update: 2017-11-01 15:18    [W:6.097 / U:4.932 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site