Kim Phillips 4957fd741d x86/cpu: Support AMD Automatic IBRS ... commit e7862eda30 upstream. The AMD Zen4 core supports a new feature called Automatic IBRS. It is a "set-and-forget" feature that means that, like Intel's Enhanced IBRS, h/w manages its IBRS mitigation resources automatically across CPL transitions. The feature is advertised by CPUID_Fn80000021_EAX bit 8 and is enabled by setting MSR C000_0080 (EFER) bit 21. Enable Automatic IBRS by default if the CPU feature is present. It typically provides greater performance over the incumbent generic retpolines mitigation. Reuse the SPECTRE_V2_EIBRS spectre_v2_mitigation enum. AMD Automatic IBRS and Intel Enhanced IBRS have similar enablement. Add NO_EIBRS_PBRSB to cpu_vuln_whitelist, since AMD Automatic IBRS isn't affected by PBRSB-eIBRS. The kernel command line option spectre_v2=eibrs is used to select AMD Automatic IBRS, if available. Signed-off-by: Kim Phillips <kim.phillips@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Acked-by: Sean Christopherson <seanjc@google.com> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Link: https://lore.kernel.org/r/20230124163319.2277355-8-kim.phillips@amd.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-04-10 16:18:33 +02:00
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ABI	platform/x86: asus-wmi: Document the dgpu_disable sysfs attribute	2024-03-01 13:21:52 +01:00
PCI	pci-v5.15-changes	2021-09-07 19:13:42 -07:00
RCU	doc: Update stallwarn.rst with recent changes	2021-07-20 13:36:33 -07:00
accounting	sched/psi: report zeroes for CPU full at the system level	2022-06-09 10:22:48 +02:00
admin-guide	x86/cpu: Support AMD Automatic IBRS	2024-04-10 16:18:33 +02:00
arm	Documentation: arm: marvell: Add 88F6825 model into list	2021-08-24 13:26:32 -06:00
arm64	arm64: Subscribe Microsoft Azure Cobalt 100 to ARM Neoverse N2 errata	2024-02-23 08:55:14 +01:00
block	Documentation: block: blk-mq: Fix small typo in multi-queue docs	2021-08-24 13:30:00 -06:00
bpf	libbpf: Rename libbpf documentation index file	2021-08-18 08:45:25 -07:00
cdrom	…
core-api	Reinstate some of "swiotlb: rework "fix info leak with DMA_FROM_DEVICE""	2022-04-08 14:24:13 +02:00
cpu-freq	cpufreq: Remove ready() callback	2021-09-02 18:04:17 +02:00
crypto	…
dev-tools	docs/scripts/gdb: add necessary make scripts_gdb step	2023-03-10 09:39:53 +01:00
devicetree	dt-bindings: nvmem: mxs-ocotp: Document fsl,ocotp	2024-01-05 15:13:34 +01:00
doc-guide	docs: doc-guide: avoid using ReST :doc:`foo` markup	2021-06-17 13:24:37 -06:00
driver-api	counter: fix docum. build problems after filename change	2023-04-20 12:13:57 +02:00
fault-injection	debugfs: fix error when writing negative value to atomic_t debugfs file	2022-12-31 13:14:03 +01:00
fb	…
features	RISC-V Patches for the 5.15 Merge Window, Part 2	2021-09-11 14:29:42 -07:00
filesystems	rename(): fix the locking of subdirectories	2024-02-23 08:54:26 +01:00
firmware-guide	Documentation: ACPI: EINJ: Fix obsolete example	2022-08-25 11:40:01 +02:00
firmware_class	…
fpga	fpga: fix spelling mistakes	2021-07-21 19:54:21 -07:00
gpu	drm/i915/display: Move DRRS code its own file	2022-03-08 19:12:40 +01:00
hid	…
hwmon	hwmon: (ftsteutates) Fix scaling of measurements	2023-03-10 09:39:21 +01:00
i2c	Documentation: i2c: add i2c-sysfs into index	2021-08-10 22:58:32 +02:00
ia64	…
ide	…
iio	…
infiniband	…
input	Input: iforce - add support for Boeder Force Feedback Wheel	2022-09-20 12:39:45 +02:00
isdn	…
kbuild	Merge branch 'akpm' (patches from Andrew)	2021-09-08 12:55:35 -07:00
kernel-hacking	docs: futex: Fix kernel-doc references after code split-up preparation	2023-04-26 13:51:53 +02:00
leds	Documentation: leds: standartizing LED names	2021-08-20 10:26:24 +02:00
litmus-tests	…
livepatch	…
locking	Documentation/locking/locktypes: Update migrate_disable() bits.	2021-12-14 10:57:18 +01:00
m68k	…
maintainer	…
mhi	…
mips	…
misc-devices	…
netlabel	…
networking	net: change accept_ra_min_rtr_lft to affect all RA lifetimes	2023-10-19 23:05:35 +02:00
nios2	…
nvdimm	…
openrisc	…
parisc	…
pcmcia	…
power	Documentation: power: include kernel-doc in Energy Model doc	2021-09-07 21:17:28 +02:00
powerpc	powerpc/doc: Fix htmldocs errors	2021-08-27 00:56:34 +10:00
process	docs/process/howto: Replace C89 with C11	2023-12-13 18:36:46 +01:00
riscv	riscv: Move early dtb mapping into the fixmap region	2023-05-01 08:23:24 +09:00
s390	vfio/mdev: Remove CONFIG_VFIO_MDEV_DEVICE	2021-06-21 15:29:25 -06:00
scheduler	This was a reasonably active cycle for documentation; this pull includes:	2021-06-28 16:53:05 -07:00
scsi	scsi: core: Fix the scsi_set_resid() documentation	2023-09-19 12:22:50 +02:00
security	KEYS: trusted: allow use of kernel RNG for key material	2023-10-19 23:05:33 +02:00
sh	…
sound	ASoC: doc: Fix undefined SND_SOC_DAPM_NOPM argument	2024-02-23 08:54:46 +01:00
sparc	…
sphinx	docs: Fix the docs build with Sphinx 6.0	2023-01-18 11:48:48 +01:00
sphinx-static	…
spi	…
staging	…
target	…
timers	…
trace	tracing/probes: Add symstr type for dynamic events	2023-08-03 10:22:30 +02:00
translations	docs/process/howto: Replace C89 with C11	2023-12-13 18:36:46 +01:00
tty/device_drivers	serial: 8250: Add proper clock handling for OxSemi PCIe devices	2022-08-17 14:24:23 +02:00
usb	docs: usb: fix malformed table	2021-08-05 12:31:51 +02:00
userspace-api	Remove DECnet support from kernel	2023-06-21 15:59:15 +02:00
virt	KVM: s390: disable migration mode when dirty tracking is disabled	2023-03-10 09:40:01 +01:00
vm	Merge branch 'akpm' (patches from Andrew)	2021-09-08 12:55:35 -07:00
w1	…
watchdog	…
x86	Another collection of documentation patches, mostly fixes but also includes	2021-09-08 16:28:14 -07:00
xtensa	…
.gitignore	…
COPYING-logo	…
Changes	…
CodingStyle	…
Kconfig	…
Makefile	docs: Makefile: Use CONFIG_SHELL not SHELL	2021-06-18 11:26:08 -06:00
SubmittingPatches	…
arch.rst	…
asm-annotations.rst	…
atomic_bitops.txt	locking/atomic: Make test_and_*_bit() ordered on failure	2022-08-25 11:39:54 +02:00
atomic_t.txt	Documentation/atomic_t: Document forward progress expectations	2021-08-04 15:16:47 +02:00
conf.py	docs/conf.py: Cope with removal of language=None in Sphinx 5.0.0	2022-06-09 10:23:30 +02:00
docutils.conf	…
dontdiff	…
index.rst	…
logo.gif	…
memory-barriers.txt	…
watch_queue.rst	…