[lkml]   [2019]   [Jul]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC PATCH, x86]: Disable CPA cache flush for selfsnoop targets
On Mon, Jul 15, 2019 at 12:39 PM Andi Kleen <> wrote:
> > Right, we don't know where the PAT invocation comes from and whether they
> > are safe to omit flushing the cache. The module load code would be one
> > obvious candidate.
> Module load just changes the writable/executable status, right? That shouldn't
> need to flush in any case because it doesn't change the caching attributes.

Indeed. module load should require a single TLB flush and no cache
flushes. I don't think we're currently efficient enough to do it with
a single TLB flush, but we should be able to...

 \ /
  Last update: 2019-07-15 21:45    [W:0.064 / U:4.896 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site