linux-kernel - Re: [GIT PULL] x86/mm changes for v4.21

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Date:   Thu, 7 Feb 2019 10:50:56 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     "Luck, Tony" <tony.luck@...el.com>, Ingo Molnar <mingo@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rik van Riel <riel@...riel.com>
Subject: Re: [GIT PULL] x86/mm changes for v4.21

On Wed, Feb 06, 2019 at 04:33:54PM -0800, Dave Hansen wrote:

> I wonder if the patches that you bisected to just changed the flushing
> from being CR3-based (and not taking an address) to being INVPCID-based,
> and taking an address that is sensitive to canonicality.

That is indeed one of the things that patch series does; before this it
would always flush world for ARRAY interfaces.

I'll have a look at the code; I seem to remember there being test for
canonical addresses, maybe they're not in the right place.