Linus Torvalds ade8ff3b6a - AMD Zen CPUs before gen 4 do not flush the RAS (Return Address Stack) ... as part of IBPB. Make sure that happens by doing the flushing in software on those generations -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEzv7L6UO9uDPlPSfHEsHwGGHeVUoFAmcI+6UACgkQEsHwGGHe VUrYVw/+JmJHckfzI1jqc+FIGkG124X5l5ml3nUwExyL5anZk3KY6QEhvEjk8xgt 5pLYaHd76W21DWsP5AOXwsLAOBptsN8E7zwmG4Wg4H9EOkcQYDujlm0a8ne+zmqk NQh/y7NzACruYJoDzo0S89Gcz2IUZ3C5HTKp9GUor4cUOw1wZsEm5RHAkl+SlK9j amGq4ABO6xE6UjnrZMDW1uo253nCTZjH9DZvwzzLXULaAQjTvn6lowSPCJWZezNh ue2Tdl/GYo6qbHyd7OYK4N4IxWNJujHLlcIXJ/mU3EPVKBh98f3SZakvoXMuWkBL KS5xxHf86Un+8UM59ZYIK8263O8CmlgmOosk+wPV2DZfnomG/dxoYvaZ7x41X2I+ xdGMiHBP3SaQmqIxdvVCbtBIoLLd5MQ/JtAcDuLM4pbXBgLTxSfF7fDb4OtpuCwe QybeQ33QNCAn63DT+3bbWKxQpzC9vpu2+t48XV9a/rgQpsnMBodFP6RSxXxBsH4I zRDMoeyfn1mTiGRbbuhwNq52M01L1G8bkJ5sX0m/PB5XGhkg46998i93W8yAKKHY 5sF1sP53idK94CNcA0fs/Z8ZoKmkszoh8GDAn3Pb+eP+m9f7EDL9AVanBzerJhfJ i69EfM9r0ESIkmmmjaycn2EVzwQ5Vtv1r/LgDI4up2bQzbPS6So= =ovJa -----END PGP SIGNATURE----- Merge tag 'x86_bugs_post_ibpb' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 IBPB fixes from Borislav Petkov: "This fixes the IBPB implementation of older AMDs (< gen4) that do not flush the RSB (Return Address Stack) so you can still do some leaking when using a "=ibpb" mitigation for Retbleed or SRSO. Fix it by doing the flushing in software on those generations. IBPB is not the default setting so this is not likely to affect anybody in practice" * tag 'x86_bugs_post_ibpb' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/bugs: Do not use UNTRAIN_RET with IBPB on entry x86/bugs: Skip RSB fill at VMEXIT x86/entry: Have entry_ibpb() invalidate return predictions x86/cpufeatures: Add a IBPB_NO_RET BUG flag x86/cpufeatures: Define X86_FEATURE_AMD_IBPB_RET		2024-10-17 19:12:38 -07:00
..
boot	mm: rework accept memory helpers	2024-09-01 20:26:07 -07:00
coco	x86/tdx: Fix "in-kernel MMIO" check	2024-09-26 09:45:04 -07:00
configs	tinyconfig: remove unnecessary 'is not set' for choice blocks	2024-09-01 20:34:38 +09:00
crypto	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
entry	x86/entry: Have entry_ibpb() invalidate return predictions	2024-10-10 10:35:27 +02:00
events	Performance events changes for v6.12:	2024-09-18 15:03:58 +02:00
hyperv	hyperv-next for v6.12	2024-09-19 08:15:30 +02:00
ia32
include	x86/cpufeatures: Add a IBPB_NO_RET BUG flag	2024-10-10 10:34:29 +02:00
kernel	x86/bugs: Do not use UNTRAIN_RET with IBPB on entry	2024-10-10 10:38:21 +02:00
kvm	KVM/arm64 fixes for 6.12, take #1	2024-10-06 03:59:22 -04:00
lib	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
math-emu	x86/math-emu: Fix function cast warnings	2024-04-08 16:06:22 +02:00
mm	x86:	2024-09-28 09:20:14 -07:00
net	bpf, x64: Fix a jit convergence issue	2024-09-04 16:46:22 -07:00
pci	x86/PCI: Check pcie_find_root_port() return for NULL	2024-08-21 15:28:08 -05:00
platform	xen: branch for v6.12-rc1a	2024-09-27 09:55:30 -07:00
power	- Kuan-Wei Chiu has developed the well-named series "lib min_heap: Min	2024-03-14 18:03:09 -07:00
purgatory	Kbuild updates for v6.10	2024-05-18 12:39:20 -07:00
ras
realmode	Makefile: remove redundant tool coverage variables	2024-05-14 23:35:48 +09:00
tools	Changes:	2024-05-19 11:32:42 -07:00
um	This pull request contains the following changes for UML:	2024-09-27 12:48:48 -07:00
video	arch: Fix name collision with ACPI's video.o	2024-05-20 21:17:06 +00:00
virt	- Add support for running the kernel in a SEV-SNP guest, over a Secure	2024-07-16 11:12:25 -07:00
xen	x86/xen: mark boot CPU of PV guest in MSR_IA32_APICBASE	2024-10-08 16:18:57 +02:00
.gitignore
Kbuild	x86/build: Use obj-y to descend into arch/x86/virt/	2024-03-30 10:41:49 +01:00
Kconfig	ALong with the usual shower of singleton patches, notable patch series in	2024-09-21 07:29:05 -07:00
Kconfig.assembler	x86/kconfig: Add as-instr64 macro to properly evaluate AS_WRUSS	2024-06-20 19:48:18 +02:00
Kconfig.cpu	x86/Kconfig: Transmeta Crusoe is CPU family 5, not 6	2024-02-09 16:28:19 +01:00
Kconfig.debug	x86/kconfig: Select ARCH_WANT_FRAME_POINTERS again when UNWINDER_FRAME_POINTER=y	2024-05-20 11:37:23 +02:00
Makefile	rust: cfi: add support for CFI_CLANG with Rust	2024-09-16 17:29:58 +02:00
Makefile_32.cpu
Makefile.postlink
Makefile.um	arch: um: rust: Use the generated target.json again	2024-07-03 12:22:11 +02:00