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Date:   Thu, 4 Jul 2019 14:49:27 -0700
From:   Andy Lutomirski <>
To:     Peter Zijlstra <>
Cc:     Thomas Gleixner <>,
        Borislav Petkov <>, Ingo Molnar <>,
        Steven Rostedt <>,
        Andrew Lutomirski <>,
        Linus Torvalds <>,
        "H. Peter Anvin" <>,
        Dave Hansen <>,
        Juergen Gross <>,
        LKML <>,
        He Zhe <>,
        Joel Fernandes <>,
Subject: Re: [PATCH v2 1/7] x86/paravirt: Make read_cr2() CALLEE_SAVE

On Thu, Jul 4, 2019 at 1:03 PM Peter Zijlstra <> wrote:
> The one paravirt read_cr2() implementation (Xen) is actually quite
> trivial and doesn't need to clobber anything other than the return
> register. By making read_cr2() CALLEE_SAVE we avoid all the PUSH/POP
> nonsense and allow more convenient use from assembly.

Wow, this is incomprehensible! :)  I'll trust Juergen's review.


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