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Date:   Wed, 6 Mar 2019 09:27:38 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Julien Thierry <julien.thierry@....com>,
        Will Deacon <will.deacon@....com>,
        Andy Lutomirski <luto@...capital.net>,
        Ingo Molnar <mingo@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        James Morse <james.morse@....com>, valentin.schneider@....com,
        Brian Gerst <brgerst@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Juergen Gross <jgross@...e.com>
Subject: Re: [PATCH 1/8] kasan,x86: Frob kasan_report() in an exception

On Wed, Mar 6, 2019 at 9:14 AM Peter Zijlstra <peterz@...radead.org> wrote:
>
> And that (obviously) explodes.. Anybody got any clue why that Xen
> trainwreck wants to paravirt: "PUSHF;POP" and "PUSH;POPF" !?

Trying to regenerate the IF flag? I dunno.

But yeah, I think you could just force all of it into an explicit asm.
Or just use native_save_fl(). Except now that I look at it, for some
reason that is "extern inline" and we have an out-of-line option. I
can't for the life of me imagine why.

[ Looking at history. Oh, it's because of that same Xen issue and Xen
wanting to use it as a function pointer. Ugh. What a crock. ]

                  Linus

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