[RFC PATCH 00/11] Avoid synchronous TLB invalidation for intermediate page-table entries on arm64

Will Deacon will.deacon at arm.com
Thu Sep 13 08:53:02 PDT 2018


On Fri, Sep 07, 2018 at 02:36:08AM -0400, Jon Masters wrote:
> On 09/05/2018 08:28 AM, Will Deacon wrote:
> > On Tue, Sep 04, 2018 at 02:38:02PM -0400, Jon Masters wrote:
> >> On 08/24/2018 11:52 AM, Will Deacon wrote:
> >>
> >>> I hacked up this RFC on the back of the recent changes to the mmu_gather
> >>> stuff in mainline. It's had a bit of testing and it looks pretty good so
> >>> far.
> >>
> >> I will request the server folks go and test this. You'll probably
> >> remember a couple of parts we've seen where aggressive walker caches
> >> ended up (correctly) seeing stale page table entries and we had all
> >> manner of horrifically hard to debug problems. We have some fairly nice
> >> reproducers that were able to find this last time that we can test.
> > 
> > Cheers, Jon, that would be very helpful. You're probably best off using
> > my (rebasing) tlb branch rather than picking the RFC:
> > 
> >   git://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git tlb
> > 
> > Let me know if you'd prefer something stable (I can tag it with a date).
> 
> That would be useful. I've prodded each of the Arm server SoC vendors I
> work with via our weekly call to have them each specifically check this.
> A tag would be helpful to that effort I expect. They all claim to be
> watching this thread now, so we'll see if they see cabbages here.

This is now all queued up in the (stable) arm64 for-next/core branch:

  https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=for-next/core

so that's the best place to grab the patches.

Will



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