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Article <jwvedbygubo.fsf-monnier+comp.arch@gnu.org>

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Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: comp.arch
Subject: Re: Another security vulnerability
Date: Mon, 25 Mar 2024 12:18:18 -0400
Organization: A noiseless patient Spider
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Message-ID: <jwvedbygubo.fsf-monnier+comp.arch@gnu.org>
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> Principle:: an Architecturally visible unit of data can only become
> visible after the causing instruction retires. A high precision timer
> makes cache line [dis]placement visible; so either take away the HPT
> or don't alter cache visible state too early.

And parallelism (e.g. multicores) can be used to emulate HPT, so "take
away the HPT" is not really an option.


        Stefan