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

[Ed Maste]

On 25 January 2018 at 17:21, Ian FREISLICH
<ian.freislich at capeaugusta.com> wrote:
>> 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.
>
> Maybe there should be an "interlock" on these knobs, although judging
> from the number of reports I'm the only that shot my foot.

Sorry for the trouble.

Once D13985 is committed these knobs can both be set to 1 (and in fact
that will be the default configuration on Intel systems). I suspect
the commit will happen soon and until then it's just a temporary bump
inherent in running -current.