linux-kernel - Re: [PATCH 15/24] x86/mm: Allow flushing for future ASID switches

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Date:   Thu, 30 Nov 2017 21:01:44 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H . Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 15/24] x86/mm: Allow flushing for future ASID switches

On Thu, Nov 30, 2017 at 10:48:56AM -0800, Andy Lutomirski wrote:
> Should it be tlb_flush_shared_nonglobals_if_kernel_and_user_pagetables_are_separate()?

Its effectively invpcid_flush_all_other() or something like that. Of
course, its not invpcid based, so we should not name it such.

flush_asid_other() ?

> The whole idea that we can get away with ambiguous functions like
> __flush_tlb() seems to be much less true with KAISER.  I think we
> should maybe start getting rid of overly vague functions like this.

There is a lot of cleanup to be done for sure. I had to actually draw
pictures to untangle this stuff.