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Date:   Fri, 8 Dec 2017 14:07:22 +0300
From:   "Kirill A. Shutemov" <>
To:     Ingo Molnar <>
Cc:     "Kirill A. Shutemov" <>,
        Ingo Molnar <>,,
        Thomas Gleixner <>,
        "H. Peter Anvin" <>,
        Linus Torvalds <>,
        Andy Lutomirski <>,
        Cyrill Gorcunov <>,
        Borislav Petkov <>, Andi Kleen <>,,
Subject: Re: [PATCHv4 3/4] x86/boot/compressed/64: Introduce

On Thu, Dec 07, 2017 at 07:30:48AM +0100, Ingo Molnar wrote:
> > We also need a small stack in the trampoline to re-enable long mode via
> > long return. But stack and code can share the page just fine.
> BTW., I'm not sure this is necessarily a good idea: it means writable+executable 
> memory, which we generally try to avoid. How complicated would it be to have them 
> separate?

It's trivial: you only need to bump TRAMPOLINE_32BIT_SIZE.

But it doesn't make much sense. We're running from indentity mapping: all
memory is r/w without NX bit set (and IA32_EFER.NXE is 0).

 Kirill A. Shutemov

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