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Date: Thu, 26 Jan 2017 08:59:38 -0800
From: Thomas Garnier <thgarnie@...gle.com>
To: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H . Peter Anvin" <hpa@...or.com>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Alexander Potapenko <glider@...gle.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Thomas Garnier <thgarnie@...gle.com>,
Kees Cook <keescook@...omium.org>,
Andy Lutomirski <luto@...nel.org>,
Arjan van de Ven <arjan@...ux.intel.com>,
Paul Gortmaker <paul.gortmaker@...driver.com>,
Borislav Petkov <bp@...e.de>,
Andy Lutomirski <luto@...capital.net>,
"Rafael J . Wysocki" <rjw@...ysocki.net>,
Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
Jiri Kosina <jikos@...nel.org>,
Matt Fleming <matt@...eblueprint.co.uk>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Juergen Gross <jgross@...e.com>,
Rusty Russell <rusty@...tcorp.com.au>,
Christian Borntraeger <borntraeger@...ibm.com>,
Fenghua Yu <fenghua.yu@...el.com>,
He Chen <he.chen@...ux.intel.com>,
Brian Gerst <brgerst@...il.com>,
"Luis R . Rodriguez" <mcgrof@...nel.org>,
Adam Buchbinder <adam.buchbinder@...il.com>,
Stanislaw Gruszka <sgruszka@...hat.com>,
Arnd Bergmann <arnd@...db.de>,
Dave Hansen <dave.hansen@...el.com>,
Chen Yucong <slaoub@...il.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
David Vrabel <david.vrabel@...rix.com>,
Josh Poimboeuf <jpoimboe@...hat.com>,
Tim Chen <tim.c.chen@...ux.intel.com>,
Rik van Riel <riel@...hat.com>,
Andi Kleen <ak@...ux.intel.com>, Jiri Olsa <jolsa@...hat.com>,
Prarit Bhargava <prarit@...hat.com>,
Michael Ellerman <mpe@...erman.id.au>,
Joerg Roedel <joro@...tes.org>,
Paolo Bonzini <pbonzini@...hat.com>,
Radim Krčmář <rkrcmar@...hat.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org,
kasan-dev@...glegroups.com, linux-pm@...r.kernel.org,
linux-efi@...r.kernel.org, xen-devel@...ts.xenproject.org,
lguest@...ts.ozlabs.org, kvm@...r.kernel.org,
kernel-hardening@...ts.openwall.com
Subject: [PATCH v2 1/3] x86/mm: Adapt MODULES_END based on Fixmap section size
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@...gle.com>
---
Based on next-20170125
---
arch/x86/include/asm/fixmap.h | 8 ++++++++
arch/x86/include/asm/pgtable_64_types.h | 3 ---
arch/x86/kernel/module.c | 1 +
arch/x86/mm/dump_pagetables.c | 1 +
arch/x86/mm/kasan_init_64.c | 1 +
5 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
index 8554f960e21b..c46289799b02 100644
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -132,6 +132,14 @@ enum fixed_addresses {
extern void reserve_top_address(unsigned long reserve);
+/* On 64bit, the module sections ends with the start of the fixmap */
+#ifdef CONFIG_X86_64
+#define MODULES_VADDR (__START_KERNEL_map + KERNEL_IMAGE_SIZE)
+#define MODULES_END __fix_to_virt(__end_of_fixed_addresses + 1)
+#define MODULES_LEN (MODULES_END - MODULES_VADDR)
+#endif /* CONFIG_X86_64 */
+
+
#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h
index 3a264200c62f..de8bace10200 100644
--- a/arch/x86/include/asm/pgtable_64_types.h
+++ b/arch/x86/include/asm/pgtable_64_types.h
@@ -66,9 +66,6 @@ typedef struct { pteval_t pte; } pte_t;
#define VMEMMAP_START __VMEMMAP_BASE
#endif /* CONFIG_RANDOMIZE_MEMORY */
#define VMALLOC_END (VMALLOC_START + _AC((VMALLOC_SIZE_TB << 40) - 1, UL))
-#define MODULES_VADDR (__START_KERNEL_map + KERNEL_IMAGE_SIZE)
-#define MODULES_END _AC(0xffffffffff000000, UL)
-#define MODULES_LEN (MODULES_END - MODULES_VADDR)
#define ESPFIX_PGD_ENTRY _AC(-2, UL)
#define ESPFIX_BASE_ADDR (ESPFIX_PGD_ENTRY << PGDIR_SHIFT)
#define EFI_VA_START ( -4 * (_AC(1, UL) << 30))
diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
index 477ae806c2fa..fad61caac75e 100644
--- a/arch/x86/kernel/module.c
+++ b/arch/x86/kernel/module.c
@@ -35,6 +35,7 @@
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/setup.h>
+#include <asm/fixmap.h>
#if 0
#define DEBUGP(fmt, ...) \
diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index ea9c49adaa1f..eefd6d015d02 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -18,6 +18,7 @@
#include <linux/seq_file.h>
#include <asm/pgtable.h>
+#include <asm/fixmap.h>
/*
* The dumper groups pagetable entries of the same type into one, and for
diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
index 0493c17b8a51..34f167cf3316 100644
--- a/arch/x86/mm/kasan_init_64.c
+++ b/arch/x86/mm/kasan_init_64.c
@@ -8,6 +8,7 @@
#include <asm/tlbflush.h>
#include <asm/sections.h>
+#include <asm/fixmap.h>
extern pgd_t early_level4_pgt[PTRS_PER_PGD];
extern struct range pfn_mapped[E820_X_MAX];
--
2.11.0.483.g087da7b7c-goog
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