linux-kernel - Re: [PATCH 3/4] x86/boot/compressed/64: Introduce place

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Message-ID: <20171110095256.vmndegdixd5keyqo@node.shutemov.name>
Date:   Fri, 10 Nov 2017 12:52:56 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...capital.net>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Borislav Petkov <bp@...e.de>, Andi Kleen <ak@...ux.intel.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] x86/boot/compressed/64: Introduce place_trampoline()

On Fri, Nov 10, 2017 at 10:14:53AM +0100, Ingo Molnar wrote:
> I'm wondering, how did you test it if no current bootloader puts the kernel to 
> above addresses of 4G?

I didn't test it directly.

I've checked with debugger that there's no memory accesses above 1M
between disabling paging in the trampoline and returning back from
trampoline to the main kernel image code.

-- 
 Kirill A. Shutemov