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bianbu-linux-6.6/arch/x86/kernel/cpu
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Pawan Gupta eb23b5ef91 x86/bugs: Warn when "ibrs" mitigation is selected on Enhanced IBRS parts 
IBRS mitigation for spectre_v2 forces write to MSR_IA32_SPEC_CTRL at
every kernel entry/exit. On Enhanced IBRS parts setting
MSR_IA32_SPEC_CTRL[IBRS] only once at boot is sufficient. MSR writes at
every kernel entry/exit incur unnecessary performance loss.

When Enhanced IBRS feature is present, print a warning about this
unnecessary performance loss.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/2a5eaf54583c2bfe0edc4fea64006656256cca17.1657814857.git.pawan.kumar.gupta@linux.intel.com
2022-07-20 19:24:53 +02:00
..
mce libnvdimm for 5.19 2022-05-27 15:49:30 -07:00
microcode x86/microcode: Remove unnecessary perf callback 2022-05-31 09:31:19 +02:00
mtrr x86/mtrr: Replace deprecated CPU-hotplug functions. 2021-08-10 14:46:27 +02:00
resctrl x86: Replace cpumask_weight() with cpumask_empty() where appropriate 2022-04-10 22:35:38 +02:00
sgx x86/sgx: Set active memcg prior to shmem allocation 2022-06-02 10:58:47 -07:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
acrn.c x86/acrn: Introduce acrn_cpuid_base() and hypervisor feature bits 2021-02-09 10:58:18 +01:00
amd.c x86/retbleed: Add fine grained Kconfig knobs 2022-06-29 17:43:41 +02:00
aperfmperf.c x86/aperfmperf: Integrate the fallback code from show_cpuinfo() 2022-04-27 20:22:20 +02:00
bugs.c x86/bugs: Warn when "ibrs" mitigation is selected on Enhanced IBRS parts 2022-07-20 19:24:53 +02:00
cacheinfo.c sched: Add cluster scheduler level for x86 2021-10-15 11:25:16 +02:00
centaur.c x86/cpu/centaur: Add Centaur family >=7 CPUs initialization support 2020-09-11 10:53:19 +02:00
common.c x86/bugs: Add Cannon lake to RETBleed affected CPU list 2022-07-07 12:33:53 +02:00
cpu.h x86/cpu/amd: Add Spectral Chicken 2022-06-27 10:34:00 +02:00
cpuid-deps.c x86/fpu: Optimize out sigframe xfeatures when in init state 2021-11-03 22:42:35 +01:00
cyrix.c x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
feat_ctl.c x86/cpu/intel: Allow SGX virtualization without Launch Control support 2021-04-06 09:43:41 +02:00
hygon.c x86/cpu/amd: Add Spectral Chicken 2022-06-27 10:34:00 +02:00
hypervisor.c x86/paravirt: Remove const mark from x86_hyper_xen_hvm variable 2019-07-17 08:09:59 +02:00
intel.c platform-drivers-x86 for v5.19-1 2022-05-23 20:38:39 -07:00
intel_epb.c x86: intel_epb: Allow model specific normal EPB value 2022-01-04 16:37:23 +01:00
intel_pconfig.c x86/pconfig: Detect PCONFIG targets 2018-03-12 12:10:54 +01:00
Makefile x86/CPU: Add support for Vortex CPUs 2021-10-21 15:49:07 +02:00
match.c x86/cpu: Add a steppings field to struct x86_cpu_id 2020-04-20 12:19:21 +02:00
mkcapflags.sh x86/cpu: Print VMX flags in /proc/cpuinfo using VMX_FEATURES_* 2020-01-13 18:36:02 +01:00
mshyperv.c hyperv-next for 5.19 2022-05-28 11:39:01 -07:00
perfctr-watchdog.c x86/nmi_watchdog: Fix old-style NMI watchdog regression on old Intel CPUs 2021-06-10 10:04:40 +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/aperfmperf: Integrate the fallback code from show_cpuinfo() 2022-04-27 20:22:20 +02:00
rdrand.c x86/rdrand: Sanity-check RDRAND output 2019-10-01 19:55:32 +02:00
scattered.c x86/speculation: Disable RRSBA behavior 2022-07-09 13:12:45 +02:00
topology.c x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
transmeta.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tsx.c x86/tsx: Disable TSX development mode at boot 2022-04-11 09:58:40 +02:00
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 KVM: VMX: Stop context switching MSR_IA32_UMWAIT_CONTROL 2020-06-22 20:54:57 -04:00
vmware.c Have vmware guests skip the refined TSC calibration when the TSC 2021-04-26 09:13:43 -07:00
vortex.c x86/CPU: Add support for Vortex CPUs 2021-10-21 15:49:07 +02:00
zhaoxin.c x86/cpu: Reinitialize IA32_FEAT_CTL MSR on BSP during wakeup 2020-06-15 14:18:37 +02:00