linux-kernel - Re: [PATCH 3/8] x86/xen: Redefine XEN_ELFNOTE_INIT_P2M using PUD_SIZE * PTRS_PER

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Date:   Mon, 17 Jul 2017 07:45:24 +0200
From:   Juergen Gross <jgross@...e.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Andy Lutomirski <luto@...capital.net>,
        linux-arch@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/8] x86/xen: Redefine XEN_ELFNOTE_INIT_P2M using PUD_SIZE
 * PTRS_PER_PUD

On 17/07/17 00:59, Kirill A. Shutemov wrote:
> XEN_ELFNOTE_INIT_P2M has to be 512GB for both 4- and 5-level paging.
> (PUD_SIZE * PTRS_PER_PUD) would do this.
> 
> Unfortunately, we cannot use P4D_SIZE, which would fit here. With
> current headers structure it cannot be used in assembly, if p4d
> level is folded.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

Reviewed-by: Juergen Gross <jgross@...e.com>


Thanks,

Juergen