linux-kernel - Re: [PATCH v2 2/2] x86/boot/64: round memory hole size up to next PMD page.

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Message-ID: <edd60d59-fdfc-2383-6cc8-e084e86e7a37@intel.com>
Date:   Mon, 23 Sep 2019 14:20:35 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Steve Wahl <steve.wahl@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Juergen Gross <jgross@...e.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Brijesh Singh <brijesh.singh@....com>,
        Jordan Borgner <mail@...dan-borgner.de>,
        Feng Tang <feng.tang@...el.com>, linux-kernel@...r.kernel.org,
        Chao Fan <fanc.fnst@...fujitsu.com>,
        Zhenzhong Duan <zhenzhong.duan@...cle.com>
Cc:     Baoquan He <bhe@...hat.com>, russ.anderson@....com,
        dimitri.sivanich@....com, mike.travis@....com
Subject: Re: [PATCH v2 2/2] x86/boot/64: round memory hole size up to next PMD
 page.

On 9/23/19 11:15 AM, Steve Wahl wrote:
> The kernel image map is created using PMD pages, which can include
> some extra space beyond what's actually needed.  Round the size of the
> memory hole we search for up to the next PMD boundary, to be certain
> all of the space to be mapped is usable RAM and includes no reserved
> areas.

This looks good.  It also fully closes any possibility that anyone's
future hardware will hit issues like this as long as they mark the
memory reserved, right?

Reviewed-by: Dave Hansen <dave.hansen@...ux.intel.com>