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Subject: Re: [PATCH v7 1/3] x86/mm: Adapt MODULES_END based on Fixmap section
 size
References: <20170314170508.100882-1-thgarnie@google.com>
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Message-ID: <799314af-e529-bc83-6322-54f5f5d28a40@oracle.com>
Date: Wed, 15 Mar 2017 09:52:54 -0400
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To: Thomas Garnier <thgarnie@google.com>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, "H . Peter Anvin" <hpa@zytor.com>, Jonathan Corbet <corbet@lwn.net>, Andrey Ryabinin <aryabinin@virtuozzo.com>, Alexander Potapenko <glider@google.com>, Dmitry Vyukov <dvyukov@google.com>, Lorenzo Stoakes <lstoakes@gmail.com>, Kees Cook <keescook@chromium.org>, Juergen Gross <jgross@suse.com>, Andy Lutomirski <luto@kernel.org>, Paul Gortmaker <paul.gortmaker@windriver.com>, Andrew Morton <akpm@linux-foundation.org>, Michal Hocko <mhocko@suse.com>, zijun_hu <zijun_hu@htc.com>, Chris Wilson <chris@chris-wilson.co.uk>, Andy Lutomirski <luto@amacapital.net>, "Rafael J . Wysocki" <rjw@rjwysocki.net>, Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>, Jiri Kosina <jikos@kernel.org>, Matt Fleming <matt@codeblueprint.co.uk>, Ard Biesheuvel <ard.biesheuvel@linaro.org>, Rusty Russell <rusty@rustcorp.com.au>, Paolo Bonzini <pbonzini@redhat.com>, Borislav Petkov <bp@suse.de>, Christian Borntraeger <borntraeger@de.ibm.com>, Frederic Weisbecker <fweisbec@gmail.com>, "Luis R . Rodriguez" <mcgrof@kernel.org>, Stanislaw Gruszka <sgruszka@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Josh Poimboeuf <jpoimboe@redhat.com>, Vitaly Kuznetsov <vkuznets@redhat.com>, Tim Chen <tim.c.chen@linux.intel.com>, Joerg Roedel <joro@8bytes.org>, =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-pm@vger.kernel.org, linux-efi@vger.kernel.org, xen-devel@lists.xenproject.org, lguest@lists.ozlabs.org, kvm@vger.kernel.org, kernel-hardening@lists.openwall.com

On 03/14/2017 01:05 PM, Thomas Garnier wrote:
> This patch aligns MODULES_END to the beginning of the Fixmap section.
> It optimizes the space available for both sections. The address is
> pre-computed based on the number of pages required by the Fixmap
> section.
>
> It will allow GDT remapping in the Fixmap section. The current
> MODULES_END static address does not provide enough space for the kernel
> to support a large number of processors.
>
> Signed-off-by: Thomas Garnier <thgarnie@google.com>

For Xen bits (and to some extent bare-metal):

Reviewed-and-Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>


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