17 Sep
2019
17 Sep
'19
8:42 a.m.
Paul - be careful. All CPU's post the IBM AGS that used branch prediction
are suspect. Russ Robelen (who was the 360/50 lead, worked on 360/90 and
lead AGS) has the speculative executing patent. I tweaked him when it all
came out and said - look at what you did.
What Russ and team are great ideas and we all have used them since they
first published about it. And the fact is that it took 40 years before
someone even proposed that it was an issue and could become security
exploit (by some folks in German at a security conference) and it Google 18
months to reduce it to practice.
?
On Tue, Sep 17, 2019 at 9:55 AM Paul Koning <paulkoning at comcast.net> wrote:
"Spectre" is one of two notorious bugs of
modern CPUs involving
speculative execution. I rather doubt that VAX is affected by this but I
suspect others here have a lot more knowledge.
paul
Begin forwarded message:
*From: *coypu at sdf.org
*Subject: **VAX + Spectre*
*Date: *September 17, 2019 at 5:32:42 AM EDT
*To: *port-vax at netbsd.org
So, this is a bug report:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86811
GCC would like to know if VAX needs Spectre-related work.
Are any of the VAXes ever made capable of speculative execution? the
first tech for doing it was in 1967, so not entirely far-fetched.
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