AuxXxilium/linux_dsm_epyc7002
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ecc7e37d4d
linux_dsm_epyc7002/arch/x86/kernel/cpu
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Thomas Gleixner ecc7e37d4d x86/io: Speedup schedule out of I/O bitmap user 
There is no requirement to update the TSS I/O bitmap when a thread using it is
scheduled out and the incoming thread does not use it.

For the permission check based on the TSS I/O bitmap the CPU calculates the memory
location of the I/O bitmap by the address of the TSS and the io_bitmap_base member
of the tss_struct. The easiest way to invalidate the I/O bitmap is to switch the
offset to an address outside of the TSS limit.

If an I/O instruction is issued from user space the TSS limit causes #GP to be
raised in the same was as valid I/O bitmap with all bits set to 1 would do.

This removes the extra work when an I/O bitmap using task is scheduled out
and puts the burden on the rare I/O bitmap users when they are scheduled
in.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2019-11-16 11:24:01 +01:00
..
mce Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-09-16 18:47:53 -07:00
microcode It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
mtrr x86: mtrr: cyrix: Mark expected switch fall-through 2019-08-07 15:12:01 +02:00
resctrl x86/resctrl: Prevent NULL pointer dereference when reading mondata 2019-11-03 17:51:22 +01:00
.gitignore
acrn.c x86/acrn: Use HYPERVISOR_CALLBACK_VECTOR for ACRN guest upcall vector 2019-06-11 21:31:31 +02:00
amd.c Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-09-16 18:47:53 -07:00
aperfmperf.c x86/cpu: Disable frequency requests via aperfmperf IPI for nohz_full CPUs 2019-06-22 17:23:48 +02:00
bugs.c Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-09-17 12:04:39 -07:00
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/io: Speedup schedule out of I/O bitmap user 2019-11-16 11:24:01 +01:00
cpu.h PM / arch: x86: Rework the MSR_IA32_ENERGY_PERF_BIAS handling 2019-04-07 22:33:19 +02:00
cpuid-deps.c x86/cpufeatures: Enable a new AVX512 CPU feature 2019-07-22 10:38:25 +02:00
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: Remove X86_FEATURE_MFENCE_RDTSC 2019-07-22 12:00:51 +02:00
hypervisor.c x86/paravirt: Remove const mark from x86_hyper_xen_hvm variable 2019-07-17 08:09:59 +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
intel.c x86/cpu: Update init data for new Airmont CPU model 2019-09-06 07:30:40 +02:00
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 x86/hyperv: Set pv_info.name to "Hyper-V" 2019-10-18 13:33:38 +02:00
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 KVM: vmx: Emulate MSR IA32_UMWAIT_CONTROL 2019-09-24 14:34:36 +02:00
vmware.c x86/cpu/vmware: Use the full form of INL in VMWARE_PORT 2019-10-08 13:26:42 +02:00
zhaoxin.c x86/cpu: Create Zhaoxin processors architecture support file 2019-06-22 11:45:57 +02:00