kernel/linux
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-10-22 19:14:51 +00:00
Code Issues Releases Packages Activity
linux/arch/x86/lib
History
Borislav Petkov e5a3331a2e x86/bugs: KVM: Add support for SRSO_MSR_FIX 
commit 8442df2b49 upstream.

Add support for

  CPUID Fn8000_0021_EAX[31] (SRSO_MSR_FIX). If this bit is 1, it
  indicates that software may use MSR BP_CFG[BpSpecReduce] to mitigate
  SRSO.

Enable BpSpecReduce to mitigate SRSO across guest/host boundaries.

Switch back to enabling the bit when virtualization is enabled and to
clear the bit when virtualization is disabled because using a MSR slot
would clear the bit when the guest is exited and any training the guest
has done, would potentially influence the host kernel when execution
enters the kernel and hasn't VMRUN the guest yet.

More detail on the public thread in Link below.

Co-developed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20241202120416.6054-1-bp@kernel.org
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-09-25 11:13:49 +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 2021-12-08 12:25:37 +01:00
atomic64_cx8_32.S locking/atomic/x86: Introduce the read64_nonatomic macro to x86_32 with cx8 2024-07-17 16:28:11 +02:00
cache-smp.c x86: fix missing includes/forward declarations 2023-12-20 16:40:30 -05:00
checksum_32.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
clear_page_64.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
cmdline.c x86/setup: Parse the builtin command line before merging 2024-07-31 21:46:35 +02:00
cmpxchg8b_emu.S Linux 6.8-rc4 2024-02-14 10:45:07 +01:00
cmpxchg16b_emu.S x86/percpu: Introduce %rip-relative addressing to PER_CPU_VAR() 2023-10-20 12:19:51 +02:00
copy_mc.c x86: call instrumentation hooks from copy_mc.c 2024-04-25 21:07:02 -07:00
copy_mc_64.S x86/copy_mc_64: Remove .fixup usage 2021-12-11 09:09:46 +01:00
copy_page_64.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
copy_user_64.S x86/uaccess: Improve performance by aligning writes to 8 bytes in copy_user_generic(), on non-FSRM/ERMS CPUs 2025-04-10 14:39:32 +02:00
copy_user_uncached_64.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +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 2021-12-08 12:25:37 +01:00
csum-partial_64.c x86/csum: clean up `csum_partial' further 2024-01-04 15:42:30 -08:00
csum-wrappers_64.c x86/lib: Address kernel-doc warnings 2023-10-03 22:46:47 +02:00
delay.c arch/x86: Fix typos 2024-01-03 11:46:22 +01:00
error-inject.c x86/error_inject: Align function properly 2022-10-17 16:40:59 +02:00
getuser.S x86: fix user address masking non-canonical speculation issue 2024-10-25 09:53:03 -07:00
hweight.S x86 assembly code improvements for v6.7 are: 2023-10-30 14:18:00 -10:00
inat.c x86/insn: Add a __ignore_sync_check__ marker 2021-03-15 11:00:57 +01:00
insn-eval.c x86/insn-eval: Fix function param name in get_eff_addr_sib() 2024-02-13 22:41:25 +01:00
insn.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
iomem.c x86/kmsan: Fix hook for unaligned accesses 2024-06-25 11:37:21 +02:00
kaslr.c x86/kaslr: Fix build warning in KASLR code in boot stub 2022-04-11 09:41:12 +02:00
Makefile x86: Stop using weak symbols for __iowrite32_copy() 2024-04-22 17:11:19 -03:00
memcpy_32.c x86/mem: Move memmove to out of line assembler 2022-11-01 15:44:07 -07:00
memcpy_64.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
memmove_32.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
memmove_64.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
memset_64.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
misc.c x86/lib: Fix overflow when counting digits 2023-11-17 06:26:14 -08:00
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 2021-12-08 12:25:37 +01:00
msr-smp.c x86/msr: Add missing __percpu annotations 2024-03-04 12:01:54 +01:00
msr.c x86/bugs: KVM: Add support for SRSO_MSR_FIX 2025-09-25 11:13:49 +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/lib: Revert to _ASM_EXTABLE_UA() for {get,put}_user() fixups 2024-01-29 11:40:41 +01:00
retpoline.S x86/its: Add support for ITS-safe return thunk 2025-05-18 08:24:59 +02:00
string_32.c lib/string: Move helper functions out of string.c 2021-09-25 08:20:49 -07:00
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: instrument copy_from_user_nmi() 2022-11-08 15:57:24 -08:00
usercopy_32.c x86/usercopy: Remove .fixup usage 2021-12-11 09:09:50 +01:00
usercopy_64.c x86/usercopy: Include arch_wb_cache_pmem() declaration 2023-05-18 11:56:18 -07:00
x86-opcode-map.txt x86/insn: Fix opcode map (!REX2) superscript tags 2025-06-19 15:31:28 +02:00