From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f200.google.com (mail-wr0-f200.google.com [209.85.128.200]) by kanga.kvack.org (Postfix) with ESMTP id BB71C6B0437 for ; Thu, 6 Apr 2017 10:52:14 -0400 (EDT) Received: by mail-wr0-f200.google.com with SMTP id z109so6496022wrb.1 for ; Thu, 06 Apr 2017 07:52:14 -0700 (PDT) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id g26si2417880wrc.30.2017.04.06.07.52.13 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 06 Apr 2017 07:52:13 -0700 (PDT) Subject: Re: [PATCH 7/8] x86: Enable 5-level paging support References: <20170406140106.78087-1-kirill.shutemov@linux.intel.com> <20170406140106.78087-8-kirill.shutemov@linux.intel.com> From: Juergen Gross Message-ID: <469e1232-617c-daaa-90a6-a90d6f80059f@suse.com> Date: Thu, 6 Apr 2017 16:52:11 +0200 MIME-Version: 1.0 In-Reply-To: <20170406140106.78087-8-kirill.shutemov@linux.intel.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: "Kirill A. Shutemov" , Linus Torvalds , Andrew Morton , x86@kernel.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Cc: Andi Kleen , Dave Hansen , Andy Lutomirski , linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org On 06/04/17 16:01, Kirill A. Shutemov wrote: > Most of things are in place and we can enable support of 5-level paging. > > Enabling XEN with 5-level paging requires more work. The patch makes XEN > dependent on !X86_5LEVEL. > > Signed-off-by: Kirill A. Shutemov > --- > arch/x86/Kconfig | 5 +++++ > arch/x86/xen/Kconfig | 1 + > 2 files changed, 6 insertions(+) > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index 4e153e93273f..7a76dcac357e 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -318,6 +318,7 @@ config FIX_EARLYCON_MEM > > config PGTABLE_LEVELS > int > + default 5 if X86_5LEVEL > default 4 if X86_64 > default 3 if X86_PAE > default 2 > @@ -1390,6 +1391,10 @@ config X86_PAE > has the cost of more pagetable lookup overhead, and also > consumes more pagetable space per process. > > +config X86_5LEVEL > + bool "Enable 5-level page tables support" > + depends on X86_64 > + > config ARCH_PHYS_ADDR_T_64BIT > def_bool y > depends on X86_64 || X86_PAE > diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig > index 76b6dbd627df..b90d481ce5a1 100644 > --- a/arch/x86/xen/Kconfig > +++ b/arch/x86/xen/Kconfig > @@ -5,6 +5,7 @@ > config XEN > bool "Xen guest support" > depends on PARAVIRT > + depends on !X86_5LEVEL > select PARAVIRT_CLOCK > select XEN_HAVE_PVMMU > select XEN_HAVE_VPMU > Just a heads up: this last change will conflict with the Xen tree. Can't we just ignore the additional level in Xen pv mode and run with 4 levels instead? Juergen -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org