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linux/arch/x86/kernel/cpu
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Thomas Gleixner f36cf386e3 x86/speculation/swapgs: Exclude ATOMs from speculation through SWAPGS 
Intel provided the following information:

 On all current Atom processors, instructions that use a segment register
 value (e.g. a load or store) will not speculatively execute before the
 last writer of that segment retires. Thus they will not use a
 speculatively written segment value.

That means on ATOMs there is no speculation through SWAPGS, so the SWAPGS
entry paths can be excluded from the extra LFENCE if PTI is disabled.

Create a separate bug flag for the through SWAPGS speculation and mark all
out-of-order ATOMs and AMD/HYGON CPUs as not affected. The in-order ATOMs
are excluded from the whole mitigation mess anyway.

Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Tyler Hicks <tyhicks@canonical.com>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
2019-07-28 21:39:55 +02:00
..
mce Merge branch 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-07-08 16:31:06 -07:00
microcode Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-06-29 19:42:30 +08:00
mtrr x86/mtrr: Skip cache flushes on CPUs with cache self-snooping 2019-06-28 07:21:00 +02:00
resctrl Merge branch 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-07-08 17:25:53 -07:00
.gitignore
acrn.c x86/acrn: Use HYPERVISOR_CALLBACK_VECTOR for ACRN guest upcall vector 2019-06-11 21:31:31 +02:00
amd.c x86/CPU/AMD: Don't force the CPB cap when running under a hypervisor 2019-05-24 08:50:32 +02:00
aperfmperf.c x86/cpu: Disable frequency requests via aperfmperf IPI for nohz_full CPUs 2019-06-22 17:23:48 +02:00
bugs.c x86/speculation/swapgs: Exclude ATOMs from speculation through SWAPGS 2019-07-28 21:39:55 +02:00
cacheinfo.c x86/cacheinfo: Fix a -Wtype-limits warning 2019-06-19 19:21:32 +02:00
centaur.c x86/CPU: Move x86_cpuinfo::x86_max_cores assignment to detect_num_cpu_cores() 2018-05-13 16:14:24 +02:00
common.c x86/speculation/swapgs: Exclude ATOMs from speculation through SWAPGS 2019-07-28 21:39:55 +02:00
cpu.h PM / arch: x86: Rework the MSR_IA32_ENERGY_PERF_BIAS handling 2019-04-07 22:33:19 +02:00
cpuid-deps.c Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-07-08 11:59:59 -07:00
cyrix.c x86/cpu/cyrix: Use correct macros for Cyrix calls on Geode processors 2019-03-21 12:28:50 +01:00
hygon.c x86/CPU/hygon: Fix phys_proc_id calculation logic for multi-die processors 2019-03-23 17:41:09 +01:00
hypervisor.c x86: Add support for Linux guests on an ACRN hypervisor 2019-06-11 21:29:22 +02:00
intel.c x86/cpu/intel: Clear cache self-snoop capability in CPUs with known errata 2019-06-28 07:20:48 +02:00
intel_epb.c x86: intel_epb: Do not build when CONFIG_PM is unset 2019-05-30 10:58:36 +02:00
intel_pconfig.c x86/pconfig: Detect PCONFIG targets 2018-03-12 12:10:54 +01:00
Makefile Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-07-08 17:49:45 -07:00
match.c x86/cpufeature: Add facility to check for min microcode revisions 2019-02-11 07:59:23 +01:00
mkcapflags.sh x86/build: Add 'set -e' to mkcapflags.sh to delete broken capflags.c 2019-06-25 09:52:05 +02:00
mshyperv.c Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-07-08 11:22:57 -07:00
perfctr-watchdog.c x86/events: Add Hygon Dhyana support to PMU infrastructure 2018-09-27 18:28:57 +02:00
powerflags.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
proc.c x86: Convert some slow-path static_cpu_has() callers to boot_cpu_has() 2019-04-08 12:13:34 +02:00
rdrand.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 335 2019-06-05 17:37:06 +02:00
scattered.c x86/cpufeatures: Combine word 11 and 12 into a new scattered features word 2019-06-20 12:38:44 +02:00
topology.c x86/topology: Create topology_max_die_per_package() 2019-05-23 10:08:30 +02:00
transmeta.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
umc.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
umwait.c x86/umwait: Add sysfs interface to control umwait maximum time 2019-06-24 01:44:20 +02:00
vmware.c x86/apic: Rename 'lapic_timer_frequency' to 'lapic_timer_period' 2019-05-09 11:06:49 +02:00
zhaoxin.c x86/cpu: Create Zhaoxin processors architecture support file 2019-06-22 11:45:57 +02:00