Re: [tip:x86/platform] x86/hyper-v: Use hypercall for remote TLB flush
From: Peter Zijlstra
Date: Fri Aug 11 2017 - 12:26:23 EST
On Fri, Aug 11, 2017 at 09:16:29AM -0700, Linus Torvalds wrote:
> On Fri, Aug 11, 2017 at 2:03 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> >
> > I'm sure we talked about using HAVE_RCU_TABLE_FREE for x86 (and yes that
> > would make it work again), but this was some years ago and I cannot
> > readily find those emails.
>
> I think the only time we really talked about HAVE_RCU_TABLE_FREE for
> x86 (at least that I was cc'd on) was not because of RCU freeing, but
> because we just wanted to use the generic page table lookup code on
> x86 *despite* not using RCU freeing.
>
> And we just ended up renaming HAVE_GENERIC_RCU_GUP as HAVE_GENERIC_GUP.
>
> There was only passing mention of maybe making x86 use RCU, but the
> discussion was really about why the IF flag meant that x86 didn't need
> to, iirc.
>
> I don't recall us ever discussing *really* making x86 use RCU.
Google finds me this:
https://lwn.net/Articles/500188/
Which includes:
http://www.mail-archive.com/kvm@xxxxxxxxxxxxxxx/msg72918.html
which does as was suggested here, selects HAVE_RCU_TABLE_FREE for
PARAVIRT_TLB_FLUSH.
But yes, this is very much virt specific nonsense, native would never
need this.