linux-kernel - Re: [GIT pull] x86/urgent for v5.9-rc2

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Message-ID: <CAHk-=wi3RkhuNytiG5MR0O0wdnN6vMP2mOuTVwpEqo6+RBTqVw@mail.gmail.com>
Date:   Sun, 23 Aug 2020 15:29:07 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: [GIT pull] x86/urgent for v5.9-rc2

On Sun, Aug 23, 2020 at 3:01 PM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> > And I don't think we need the GDT for anything else normally, so it's
> > not even going to be cached.
>
> Who cares, really?
>
> It's pretty irrelevant because the main source of horrors are in having
> to run through _ALL_ registered NMI handlers. Why would you worry about
> the extra cache miss?

Yeah, it's probably not a big deal, it's just sad that KVM can't do
the simpler sequence well.

             Linus