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linux/arch/x86/lib
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Pawan Gupta 5d19a0574b x86/its: Add support for ITS-safe return thunk 
commit a75bf27fe4 upstream.

RETs in the lower half of cacheline may be affected by ITS bug,
specifically when the RSB-underflows. Use ITS-safe return thunk for such
RETs.

RETs that are not patched:

- RET in retpoline sequence does not need to be patched, because the
  sequence itself fills an RSB before RET.
- RETs in .init section are not reachable after init.
- RETs that are explicitly marked safe with ANNOTATE_UNRET_SAFE.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-05-22 14:08:23 +02:00
..
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
atomic64_32.c x86: Adjust asm constraints in atomic64 wrappers 2012-01-20 17:29:31 -08:00
atomic64_386_32.S x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
atomic64_cx8_32.S x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
cache-smp.c smp: Remove smp_call_function() and on_each_cpu() return values 2019-06-23 14:26:26 +02:00
checksum_32.S x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
clear_page_64.S x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
cmdline.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
cmpxchg8b_emu.S x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
cmpxchg16b_emu.S x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
copy_mc.c iov_iter, x86: Be consistent about the __user tag on copy_mc_to_user() 2023-11-20 11:08:12 +01:00
copy_mc_64.S x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
copy_page_64.S x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
copy_user_64.S x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
cpu.c x86/lib/cpu: Address missing prototypes warning 2019-08-08 08:25:53 +02:00
csum-copy_64.S x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
csum-partial_64.c x86/lib: Fix indentation issue, remove extra tab 2019-03-21 12:24:38 +01:00
csum-wrappers_64.c amd64: switch csum_partial_copy_generic() to new calling conventions 2020-08-20 15:45:22 -04:00
delay.c x86/delay: Fix the wrong asm constraint in delay_loop() 2022-06-09 10:22:45 +02:00
error-inject.c x86: Prepare inline-asm for straight-line-speculation 2022-05-15 20:18:50 +02:00
getuser.S x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
hweight.S x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
inat.c x86/insn: Add a __ignore_sync_check__ marker 2021-03-15 11:00:57 +01:00
insn-eval.c x86/entry_32: Fix segment exceptions 2022-07-29 17:25:33 +02:00
insn.c x86/insn: Use get_unaligned() instead of memcpy() 2021-11-18 19:16:30 +01:00
iomap_copy_64.S x86/asm: Fix an assembler warning with current binutils 2023-01-24 07:22:42 +01:00
iomem.c x86: explicitly align IO accesses in memcpy_{to,from}io 2019-02-01 09:07:48 -08:00
kaslr.c x86/kaslr: Fix incorrect i8254 outb() parameters 2019-01-11 21:35:47 +01:00
Makefile x86: Add support for 0x22/0x23 port I/O configuration space 2021-08-10 23:31:43 +02:00
memcpy_32.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
memcpy_64.S x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
memmove_64.S x86: Use return-thunk in asm code 2022-07-23 12:54:00 +02:00
memset_64.S x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
misc.c x86/lib: Fix overflow when counting digits 2024-01-25 14:52:32 -08:00
mmx_32.c x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
msr-reg-export.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
msr-reg.S x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
msr-smp.c x86/msr: Fix wr/rdmsr_safe_regs_on_cpu() prototypes 2021-03-22 21:37:03 +01:00
msr.c x86/msr: Make locally used functions static 2021-04-08 11:57:40 +02:00
pc-conf-reg.c x86: Add support for 0x22/0x23 port I/O configuration space 2021-08-10 23:31:43 +02:00
putuser.S x86: Prepare asm files for straight-line-speculation 2022-05-15 20:18:49 +02:00
retpoline.S x86/its: Add support for ITS-safe return thunk 2025-05-22 14:08:23 +02:00
string_32.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
strstr_32.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
usercopy.c x86/uaccess: Document copy_from_user_nmi() 2020-11-18 13:19:01 +01:00
usercopy_32.c docs/core-api/mm: fix user memory accessors formatting 2019-03-05 21:07:20 -08:00
usercopy_64.c x86: __memcpy_flushcache: fix wrong alignment if size > 2^32 2022-05-09 09:14:40 +02:00
x86-opcode-map.txt x86/insn: Fix PUSH instruction in x86 instruction decoder opcode map 2024-06-16 13:39:31 +02:00