| Message ID | 20170120164126.27624-1-thgarnie@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Jan 20, 2017 at 8:41 AM, Thomas Garnier <thgarnie@google.com> 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> Looks good to me. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Thomas,
[auto build test ERROR on tip/auto-latest]
[also build test ERROR on v4.10-rc4 next-20170120]
[cannot apply to tip/x86/core]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Thomas-Garnier/x86-mm-Adapt-MODULES_END-based-on-Fixmap-section-size/20170121-094756
config: x86_64-randconfig-x002-201703 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All errors (new ones prefixed by >>):
arch/x86/mm/kasan_init_64.c: In function 'kasan_init':
>> arch/x86/mm/kasan_init_64.c:120:57: error: 'MODULES_END' undeclared (first use in this function)
kasan_populate_zero_shadow(kasan_mem_to_shadow((void *)MODULES_END),
^~~~~~~~~~~
arch/x86/mm/kasan_init_64.c:120:57: note: each undeclared identifier is reported only once for each function it appears in
vim +/MODULES_END +120 arch/x86/mm/kasan_init_64.c
c420f167d Andrey Ryabinin 2015-02-13 114 kasan_mem_to_shadow((void *)__START_KERNEL_map));
c420f167d Andrey Ryabinin 2015-02-13 115
c420f167d Andrey Ryabinin 2015-02-13 116 vmemmap_populate((unsigned long)kasan_mem_to_shadow(_stext),
c420f167d Andrey Ryabinin 2015-02-13 117 (unsigned long)kasan_mem_to_shadow(_end),
c420f167d Andrey Ryabinin 2015-02-13 118 NUMA_NO_NODE);
c420f167d Andrey Ryabinin 2015-02-13 119
69786cdb3 Andrey Ryabinin 2015-08-13 @120 kasan_populate_zero_shadow(kasan_mem_to_shadow((void *)MODULES_END),
ef7f0d6a6 Andrey Ryabinin 2015-02-13 121 (void *)KASAN_SHADOW_END);
ef7f0d6a6 Andrey Ryabinin 2015-02-13 122
ef7f0d6a6 Andrey Ryabinin 2015-02-13 123 load_cr3(init_level4_pgt);
:::::: The code at line 120 was first introduced by commit
:::::: 69786cdb379bbc6eab14cf2393c1abd879316e85 x86/kasan, mm: Introduce generic kasan_populate_zero_shadow()
:::::: TO: Andrey Ryabinin <ryabinin.a.a@gmail.com>
:::::: CC: Ingo Molnar <mingo@kernel.org>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
Hi Thomas,
[auto build test ERROR on tip/auto-latest]
[also build test ERROR on v4.10-rc4 next-20170120]
[cannot apply to tip/x86/core]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Thomas-Garnier/x86-mm-Adapt-MODULES_END-based-on-Fixmap-section-size/20170121-094756
config: x86_64-randconfig-x008-201703 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All errors (new ones prefixed by >>):
>> arch/x86/mm/dump_pagetables.c:85:4: error: 'MODULES_VADDR' undeclared here (not in a function)
{ MODULES_VADDR, "Modules" },
^~~~~~~~~~~~~
>> arch/x86/mm/dump_pagetables.c:86:4: error: 'MODULES_END' undeclared here (not in a function)
{ MODULES_END, "End Modules" },
^~~~~~~~~~~
vim +/MODULES_VADDR +85 arch/x86/mm/dump_pagetables.c
3891a04aa H. Peter Anvin 2014-04-29 79 { ESPFIX_BASE_ADDR, "ESPfix Area", 16 },
8a5a5d153 Mathias Krause 2014-09-07 80 # endif
8266e31ed Mathias Krause 2014-09-21 81 # ifdef CONFIG_EFI
8266e31ed Mathias Krause 2014-09-21 82 { EFI_VA_END, "EFI Runtime Services" },
8266e31ed Mathias Krause 2014-09-21 83 # endif
fe770bf03 H. Peter Anvin 2008-04-17 84 { __START_KERNEL_map, "High Kernel Mapping" },
9a79cf9c1 Yinghai Lu 2008-03-07 @85 { MODULES_VADDR, "Modules" },
9a79cf9c1 Yinghai Lu 2008-03-07 @86 { MODULES_END, "End Modules" },
fe770bf03 H. Peter Anvin 2008-04-17 87 #else
fe770bf03 H. Peter Anvin 2008-04-17 88 { PAGE_OFFSET, "Kernel Mapping" },
fe770bf03 H. Peter Anvin 2008-04-17 89 { 0/* VMALLOC_START */, "vmalloc() Area" },
:::::: The code at line 85 was first introduced by commit
:::::: 9a79cf9c1aa671325fa5ba37576c2cee23823d04 x86: sort address_markers for dump_pagetables
:::::: TO: Yinghai Lu <yhlu.kernel@gmail.com>
:::::: CC: Ingo Molnar <mingo@elte.hu>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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))
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> --- Based on next-20170119 --- arch/x86/include/asm/fixmap.h | 8 ++++++++ arch/x86/include/asm/pgtable_64_types.h | 3 --- 2 files changed, 8 insertions(+), 3 deletions(-)