linux-kernel - Re: [PATCH 4/5] x86/kernel: Move page table macros to new header

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Date: Thu, 23 May 2024 13:40:18 +0200
From: Juergen Gross <jgross@...e.com>
To: Jason Andryuk <jason.andryuk@....com>,
 Boris Ostrovsky <boris.ostrovsky@...cle.com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
 Stefano Stabellini <sstabellini@...nel.org>,
 Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
 Paolo Bonzini <pbonzini@...hat.com>
Cc: xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] x86/kernel: Move page table macros to new header

On 10.04.24 21:48, Jason Andryuk wrote:
> The PVH entry point will need an additional set of prebuild page tables.
> Move the macros and defines to a new header so they can be re-used.
> 
> Signed-off-by: Jason Andryuk <jason.andryuk@....com>

With the one nit below addressed:

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

...

> diff --git a/arch/x86/kernel/pgtable_64_helpers.h b/arch/x86/kernel/pgtable_64_helpers.h
> new file mode 100644
> index 000000000000..0ae87d768ce2
> --- /dev/null
> +++ b/arch/x86/kernel/pgtable_64_helpers.h
> @@ -0,0 +1,28 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __PGTABLES_64_H__
> +#define __PGTABLES_64_H__
> +
> +#ifdef __ASSEMBLY__
> +
> +#define l4_index(x)	(((x) >> 39) & 511)
> +#define pud_index(x)	(((x) >> PUD_SHIFT) & (PTRS_PER_PUD-1))

Please fix the minor style issue in this line by s/-/ - /

Juergen

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