Re: Insta-reset-bootloop with r328166 and vm.pmap.pcid_enabled=1

From: Konstantin Belousov <kostikbel_at_gmail.com>
Date: Fri, 26 Jan 2018 00:13:12 +0200
On Thu, Jan 25, 2018 at 04:58:04PM -0500, Ian FREISLICH wrote:
> Hi
> 
> I cannot for the life of me recall why I had vm.pmap.pcid_enabled=1 set
> in loader.conf, but I did.š Most likely very historical reasons.
> 
> r328166 and later reset without dropping into the debugger during boot,
> no panic message.

Yes, this is how it is currently behaves.
PCID can be used to optimize PTI, see https://reviews.freebsd.org/D13985.
It is used for very differrent algorithm when PTI=1, comparing with PTI=0.
Received on Thu Jan 25 2018 - 21:13:22 UTC

This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:41:14 UTC