License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 22:07:57 +08:00
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/* SPDX-License-Identifier: GPL-2.0 */
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2016-01-27 05:12:04 +08:00
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#ifndef _ASM_X86_CPUFEATURES_H
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#define _ASM_X86_CPUFEATURES_H
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#ifndef _ASM_X86_REQUIRED_FEATURES_H
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#include <asm/required-features.h>
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#endif
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#ifndef _ASM_X86_DISABLED_FEATURES_H
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#include <asm/disabled-features.h>
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#endif
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/*
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* Defines x86 CPU feature bits
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*/
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2018-01-26 00:14:09 +08:00
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#define NCAPINTS 19 /* N 32-bit words worth of info */
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2017-10-31 20:17:22 +08:00
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#define NBUGINTS 1 /* N 32-bit bug flags */
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2016-01-27 05:12:04 +08:00
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/*
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* Note: If the comment begins with a quoted string, that string is used
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* in /proc/cpuinfo instead of the macro name. If the string is "",
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* this feature bit is not displayed in /proc/cpuinfo at all.
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2017-10-31 20:17:23 +08:00
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*
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2017-10-14 05:56:42 +08:00
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* When adding new features here that depend on other features,
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2017-10-31 20:17:23 +08:00
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* please update the table in kernel/cpu/cpuid-deps.c as well.
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2017-10-14 05:56:42 +08:00
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*/
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2017-10-31 20:17:23 +08:00
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/* Intel-defined CPU features, CPUID level 0x00000001 (EDX), word 0 */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_FPU ( 0*32+ 0) /* Onboard FPU */
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#define X86_FEATURE_VME ( 0*32+ 1) /* Virtual Mode Extensions */
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#define X86_FEATURE_DE ( 0*32+ 2) /* Debugging Extensions */
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#define X86_FEATURE_PSE ( 0*32+ 3) /* Page Size Extensions */
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#define X86_FEATURE_TSC ( 0*32+ 4) /* Time Stamp Counter */
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#define X86_FEATURE_MSR ( 0*32+ 5) /* Model-Specific Registers */
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#define X86_FEATURE_PAE ( 0*32+ 6) /* Physical Address Extensions */
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#define X86_FEATURE_MCE ( 0*32+ 7) /* Machine Check Exception */
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#define X86_FEATURE_CX8 ( 0*32+ 8) /* CMPXCHG8 instruction */
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#define X86_FEATURE_APIC ( 0*32+ 9) /* Onboard APIC */
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#define X86_FEATURE_SEP ( 0*32+11) /* SYSENTER/SYSEXIT */
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#define X86_FEATURE_MTRR ( 0*32+12) /* Memory Type Range Registers */
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#define X86_FEATURE_PGE ( 0*32+13) /* Page Global Enable */
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#define X86_FEATURE_MCA ( 0*32+14) /* Machine Check Architecture */
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2017-10-31 20:17:23 +08:00
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#define X86_FEATURE_CMOV ( 0*32+15) /* CMOV instructions (plus FCMOVcc, FCOMI with FPU) */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_PAT ( 0*32+16) /* Page Attribute Table */
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#define X86_FEATURE_PSE36 ( 0*32+17) /* 36-bit PSEs */
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#define X86_FEATURE_PN ( 0*32+18) /* Processor serial number */
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#define X86_FEATURE_CLFLUSH ( 0*32+19) /* CLFLUSH instruction */
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#define X86_FEATURE_DS ( 0*32+21) /* "dts" Debug Store */
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#define X86_FEATURE_ACPI ( 0*32+22) /* ACPI via MSR */
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#define X86_FEATURE_MMX ( 0*32+23) /* Multimedia Extensions */
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#define X86_FEATURE_FXSR ( 0*32+24) /* FXSAVE/FXRSTOR, CR4.OSFXSR */
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#define X86_FEATURE_XMM ( 0*32+25) /* "sse" */
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#define X86_FEATURE_XMM2 ( 0*32+26) /* "sse2" */
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#define X86_FEATURE_SELFSNOOP ( 0*32+27) /* "ss" CPU self snoop */
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#define X86_FEATURE_HT ( 0*32+28) /* Hyper-Threading */
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#define X86_FEATURE_ACC ( 0*32+29) /* "tm" Automatic clock control */
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#define X86_FEATURE_IA64 ( 0*32+30) /* IA-64 processor */
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#define X86_FEATURE_PBE ( 0*32+31) /* Pending Break Enable */
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2016-01-27 05:12:04 +08:00
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/* AMD-defined CPU features, CPUID level 0x80000001, word 1 */
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/* Don't duplicate feature flags which are redundant with Intel! */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_SYSCALL ( 1*32+11) /* SYSCALL/SYSRET */
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2017-10-31 20:17:23 +08:00
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#define X86_FEATURE_MP ( 1*32+19) /* MP Capable */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_NX ( 1*32+20) /* Execute Disable */
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#define X86_FEATURE_MMXEXT ( 1*32+22) /* AMD MMX extensions */
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#define X86_FEATURE_FXSR_OPT ( 1*32+25) /* FXSAVE/FXRSTOR optimizations */
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#define X86_FEATURE_GBPAGES ( 1*32+26) /* "pdpe1gb" GB pages */
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#define X86_FEATURE_RDTSCP ( 1*32+27) /* RDTSCP */
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2017-10-31 20:17:23 +08:00
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#define X86_FEATURE_LM ( 1*32+29) /* Long Mode (x86-64, 64-bit support) */
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#define X86_FEATURE_3DNOWEXT ( 1*32+30) /* AMD 3DNow extensions */
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#define X86_FEATURE_3DNOW ( 1*32+31) /* 3DNow */
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2016-01-27 05:12:04 +08:00
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/* Transmeta-defined CPU features, CPUID level 0x80860001, word 2 */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_RECOVERY ( 2*32+ 0) /* CPU in recovery mode */
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#define X86_FEATURE_LONGRUN ( 2*32+ 1) /* Longrun power control */
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#define X86_FEATURE_LRTI ( 2*32+ 3) /* LongRun table interface */
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2016-01-27 05:12:04 +08:00
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/* Other features, Linux-defined mapping, word 3 */
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/* This range is used for feature bits which conflict or are synthesized */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_CXMMX ( 3*32+ 0) /* Cyrix MMX extensions */
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#define X86_FEATURE_K6_MTRR ( 3*32+ 1) /* AMD K6 nonstandard MTRRs */
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#define X86_FEATURE_CYRIX_ARR ( 3*32+ 2) /* Cyrix ARRs (= MTRRs) */
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#define X86_FEATURE_CENTAUR_MCR ( 3*32+ 3) /* Centaur MCRs (= MTRRs) */
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2017-10-31 20:17:23 +08:00
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/* CPU types for specific tunings: */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_K8 ( 3*32+ 4) /* "" Opteron, Athlon64 */
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#define X86_FEATURE_K7 ( 3*32+ 5) /* "" Athlon */
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#define X86_FEATURE_P3 ( 3*32+ 6) /* "" P3 */
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#define X86_FEATURE_P4 ( 3*32+ 7) /* "" P4 */
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#define X86_FEATURE_CONSTANT_TSC ( 3*32+ 8) /* TSC ticks at a constant rate */
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2017-10-31 20:17:23 +08:00
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#define X86_FEATURE_UP ( 3*32+ 9) /* SMP kernel running on UP */
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#define X86_FEATURE_ART ( 3*32+10) /* Always running timer (ART) */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_ARCH_PERFMON ( 3*32+11) /* Intel Architectural PerfMon */
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#define X86_FEATURE_PEBS ( 3*32+12) /* Precise-Event Based Sampling */
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#define X86_FEATURE_BTS ( 3*32+13) /* Branch Trace Store */
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2017-10-31 20:17:23 +08:00
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#define X86_FEATURE_SYSCALL32 ( 3*32+14) /* "" syscall in IA32 userspace */
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#define X86_FEATURE_SYSENTER32 ( 3*32+15) /* "" sysenter in IA32 userspace */
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#define X86_FEATURE_REP_GOOD ( 3*32+16) /* REP microcode works well */
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#define X86_FEATURE_MFENCE_RDTSC ( 3*32+17) /* "" MFENCE synchronizes RDTSC */
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#define X86_FEATURE_LFENCE_RDTSC ( 3*32+18) /* "" LFENCE synchronizes RDTSC */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_ACC_POWER ( 3*32+19) /* AMD Accumulated Power Mechanism */
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#define X86_FEATURE_NOPL ( 3*32+20) /* The NOPL (0F 1F) instructions */
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#define X86_FEATURE_ALWAYS ( 3*32+21) /* "" Always-present feature */
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2017-10-31 20:17:23 +08:00
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#define X86_FEATURE_XTOPOLOGY ( 3*32+22) /* CPU topology enum extensions */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_TSC_RELIABLE ( 3*32+23) /* TSC is known to be reliable */
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#define X86_FEATURE_NONSTOP_TSC ( 3*32+24) /* TSC does not stop in C states */
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#define X86_FEATURE_CPUID ( 3*32+25) /* CPU has CPUID instruction itself */
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2017-10-31 20:17:23 +08:00
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#define X86_FEATURE_EXTD_APICID ( 3*32+26) /* Extended APICID (8 bits) */
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#define X86_FEATURE_AMD_DCM ( 3*32+27) /* AMD multi-node processor */
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#define X86_FEATURE_APERFMPERF ( 3*32+28) /* P-State hardware coordination feedback capability (APERF/MPERF MSRs) */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_NONSTOP_TSC_S3 ( 3*32+30) /* TSC doesn't stop in S3 state */
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#define X86_FEATURE_TSC_KNOWN_FREQ ( 3*32+31) /* TSC has known frequency */
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2016-01-27 05:12:04 +08:00
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2017-10-31 20:17:23 +08:00
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/* Intel-defined CPU features, CPUID level 0x00000001 (ECX), word 4 */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_XMM3 ( 4*32+ 0) /* "pni" SSE-3 */
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#define X86_FEATURE_PCLMULQDQ ( 4*32+ 1) /* PCLMULQDQ instruction */
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#define X86_FEATURE_DTES64 ( 4*32+ 2) /* 64-bit Debug Store */
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2017-10-31 20:17:23 +08:00
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#define X86_FEATURE_MWAIT ( 4*32+ 3) /* "monitor" MONITOR/MWAIT support */
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#define X86_FEATURE_DSCPL ( 4*32+ 4) /* "ds_cpl" CPL-qualified (filtered) Debug Store */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_VMX ( 4*32+ 5) /* Hardware virtualization */
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2017-10-31 20:17:23 +08:00
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#define X86_FEATURE_SMX ( 4*32+ 6) /* Safer Mode eXtensions */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_EST ( 4*32+ 7) /* Enhanced SpeedStep */
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#define X86_FEATURE_TM2 ( 4*32+ 8) /* Thermal Monitor 2 */
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#define X86_FEATURE_SSSE3 ( 4*32+ 9) /* Supplemental SSE-3 */
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#define X86_FEATURE_CID ( 4*32+10) /* Context ID */
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#define X86_FEATURE_SDBG ( 4*32+11) /* Silicon Debug */
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#define X86_FEATURE_FMA ( 4*32+12) /* Fused multiply-add */
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2017-10-31 20:17:23 +08:00
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#define X86_FEATURE_CX16 ( 4*32+13) /* CMPXCHG16B instruction */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_XTPR ( 4*32+14) /* Send Task Priority Messages */
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2017-10-31 20:17:23 +08:00
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#define X86_FEATURE_PDCM ( 4*32+15) /* Perf/Debug Capabilities MSR */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_PCID ( 4*32+17) /* Process Context Identifiers */
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#define X86_FEATURE_DCA ( 4*32+18) /* Direct Cache Access */
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#define X86_FEATURE_XMM4_1 ( 4*32+19) /* "sse4_1" SSE-4.1 */
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#define X86_FEATURE_XMM4_2 ( 4*32+20) /* "sse4_2" SSE-4.2 */
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2017-10-31 20:17:23 +08:00
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#define X86_FEATURE_X2APIC ( 4*32+21) /* X2APIC */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_MOVBE ( 4*32+22) /* MOVBE instruction */
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#define X86_FEATURE_POPCNT ( 4*32+23) /* POPCNT instruction */
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2017-10-31 20:17:23 +08:00
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#define X86_FEATURE_TSC_DEADLINE_TIMER ( 4*32+24) /* TSC deadline timer */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_AES ( 4*32+25) /* AES instructions */
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2017-10-31 20:17:23 +08:00
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#define X86_FEATURE_XSAVE ( 4*32+26) /* XSAVE/XRSTOR/XSETBV/XGETBV instructions */
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#define X86_FEATURE_OSXSAVE ( 4*32+27) /* "" XSAVE instruction enabled in the OS */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_AVX ( 4*32+28) /* Advanced Vector Extensions */
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2017-10-31 20:17:23 +08:00
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#define X86_FEATURE_F16C ( 4*32+29) /* 16-bit FP conversions */
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#define X86_FEATURE_RDRAND ( 4*32+30) /* RDRAND instruction */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_HYPERVISOR ( 4*32+31) /* Running on a hypervisor */
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2016-01-27 05:12:04 +08:00
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/* VIA/Cyrix/Centaur-defined CPU features, CPUID level 0xC0000001, word 5 */
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2017-10-31 20:17:22 +08:00
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#define X86_FEATURE_XSTORE ( 5*32+ 2) /* "rng" RNG present (xstore) */
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#define X86_FEATURE_XSTORE_EN ( 5*32+ 3) /* "rng_en" RNG enabled */
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#define X86_FEATURE_XCRYPT ( 5*32+ 6) /* "ace" on-CPU crypto (xcrypt) */
|
|
|
|
|
#define X86_FEATURE_XCRYPT_EN ( 5*32+ 7) /* "ace_en" on-CPU crypto enabled */
|
|
|
|
|
#define X86_FEATURE_ACE2 ( 5*32+ 8) /* Advanced Cryptography Engine v2 */
|
|
|
|
|
#define X86_FEATURE_ACE2_EN ( 5*32+ 9) /* ACE v2 enabled */
|
|
|
|
|
#define X86_FEATURE_PHE ( 5*32+10) /* PadLock Hash Engine */
|
|
|
|
|
#define X86_FEATURE_PHE_EN ( 5*32+11) /* PHE enabled */
|
|
|
|
|
#define X86_FEATURE_PMM ( 5*32+12) /* PadLock Montgomery Multiplier */
|
|
|
|
|
#define X86_FEATURE_PMM_EN ( 5*32+13) /* PMM enabled */
|
2016-01-27 05:12:04 +08:00
|
|
|
|
2017-10-31 20:17:23 +08:00
|
|
|
/* More extended AMD flags: CPUID level 0x80000001, ECX, word 6 */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_LAHF_LM ( 6*32+ 0) /* LAHF/SAHF in long mode */
|
|
|
|
|
#define X86_FEATURE_CMP_LEGACY ( 6*32+ 1) /* If yes HyperThreading not valid */
|
2017-10-31 20:17:23 +08:00
|
|
|
#define X86_FEATURE_SVM ( 6*32+ 2) /* Secure Virtual Machine */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_EXTAPIC ( 6*32+ 3) /* Extended APIC space */
|
|
|
|
|
#define X86_FEATURE_CR8_LEGACY ( 6*32+ 4) /* CR8 in 32-bit mode */
|
|
|
|
|
#define X86_FEATURE_ABM ( 6*32+ 5) /* Advanced bit manipulation */
|
|
|
|
|
#define X86_FEATURE_SSE4A ( 6*32+ 6) /* SSE-4A */
|
|
|
|
|
#define X86_FEATURE_MISALIGNSSE ( 6*32+ 7) /* Misaligned SSE mode */
|
|
|
|
|
#define X86_FEATURE_3DNOWPREFETCH ( 6*32+ 8) /* 3DNow prefetch instructions */
|
|
|
|
|
#define X86_FEATURE_OSVW ( 6*32+ 9) /* OS Visible Workaround */
|
|
|
|
|
#define X86_FEATURE_IBS ( 6*32+10) /* Instruction Based Sampling */
|
|
|
|
|
#define X86_FEATURE_XOP ( 6*32+11) /* extended AVX instructions */
|
|
|
|
|
#define X86_FEATURE_SKINIT ( 6*32+12) /* SKINIT/STGI instructions */
|
|
|
|
|
#define X86_FEATURE_WDT ( 6*32+13) /* Watchdog timer */
|
|
|
|
|
#define X86_FEATURE_LWP ( 6*32+15) /* Light Weight Profiling */
|
|
|
|
|
#define X86_FEATURE_FMA4 ( 6*32+16) /* 4 operands MAC instructions */
|
2017-10-31 20:17:23 +08:00
|
|
|
#define X86_FEATURE_TCE ( 6*32+17) /* Translation Cache Extension */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_NODEID_MSR ( 6*32+19) /* NodeId MSR */
|
2017-10-31 20:17:23 +08:00
|
|
|
#define X86_FEATURE_TBM ( 6*32+21) /* Trailing Bit Manipulations */
|
|
|
|
|
#define X86_FEATURE_TOPOEXT ( 6*32+22) /* Topology extensions CPUID leafs */
|
|
|
|
|
#define X86_FEATURE_PERFCTR_CORE ( 6*32+23) /* Core performance counter extensions */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_PERFCTR_NB ( 6*32+24) /* NB performance counter extensions */
|
2017-10-31 20:17:23 +08:00
|
|
|
#define X86_FEATURE_BPEXT ( 6*32+26) /* Data breakpoint extension */
|
|
|
|
|
#define X86_FEATURE_PTSC ( 6*32+27) /* Performance time-stamp counter */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_PERFCTR_LLC ( 6*32+28) /* Last Level Cache performance counter extensions */
|
2017-10-31 20:17:23 +08:00
|
|
|
#define X86_FEATURE_MWAITX ( 6*32+29) /* MWAIT extension (MONITORX/MWAITX instructions) */
|
2016-01-27 05:12:04 +08:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Auxiliary flags: Linux defined - For features scattered in various
|
|
|
|
|
* CPUID levels like 0x6, 0xA etc, word 7.
|
|
|
|
|
*
|
|
|
|
|
* Reuse free bits when adding new feature flags!
|
|
|
|
|
*/
|
2017-10-31 20:17:23 +08:00
|
|
|
#define X86_FEATURE_RING3MWAIT ( 7*32+ 0) /* Ring 3 MONITOR/MWAIT instructions */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_CPUID_FAULT ( 7*32+ 1) /* Intel CPUID faulting */
|
|
|
|
|
#define X86_FEATURE_CPB ( 7*32+ 2) /* AMD Core Performance Boost */
|
|
|
|
|
#define X86_FEATURE_EPB ( 7*32+ 3) /* IA32_ENERGY_PERF_BIAS support */
|
|
|
|
|
#define X86_FEATURE_CAT_L3 ( 7*32+ 4) /* Cache Allocation Technology L3 */
|
|
|
|
|
#define X86_FEATURE_CAT_L2 ( 7*32+ 5) /* Cache Allocation Technology L2 */
|
|
|
|
|
#define X86_FEATURE_CDP_L3 ( 7*32+ 6) /* Code and Data Prioritization L3 */
|
2017-12-04 22:08:01 +08:00
|
|
|
#define X86_FEATURE_INVPCID_SINGLE ( 7*32+ 7) /* Effectively INVPCID && CR4.PCIDE=1 */
|
2016-01-27 05:12:04 +08:00
|
|
|
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_HW_PSTATE ( 7*32+ 8) /* AMD HW-PState */
|
|
|
|
|
#define X86_FEATURE_PROC_FEEDBACK ( 7*32+ 9) /* AMD ProcFeedbackInterface */
|
|
|
|
|
#define X86_FEATURE_SME ( 7*32+10) /* AMD Secure Memory Encryption */
|
2017-12-04 22:07:33 +08:00
|
|
|
#define X86_FEATURE_PTI ( 7*32+11) /* Kernel Page Table Isolation enabled */
|
2018-01-28 00:24:32 +08:00
|
|
|
#define X86_FEATURE_RETPOLINE ( 7*32+12) /* "" Generic Retpoline mitigation for Spectre variant 2 */
|
|
|
|
|
#define X86_FEATURE_RETPOLINE_AMD ( 7*32+13) /* "" AMD Retpoline mitigation for Spectre variant 2 */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_INTEL_PPIN ( 7*32+14) /* Intel Processor Inventory Number */
|
2017-12-21 06:57:21 +08:00
|
|
|
#define X86_FEATURE_CDP_L2 ( 7*32+15) /* Code and Data Prioritization L2 */
|
2016-01-27 05:12:04 +08:00
|
|
|
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_MBA ( 7*32+18) /* Memory Bandwidth Allocation */
|
2018-01-28 00:24:32 +08:00
|
|
|
#define X86_FEATURE_RSB_CTXSW ( 7*32+19) /* "" Fill RSB on context switches */
|
2018-02-01 22:04:17 +08:00
|
|
|
#define X86_FEATURE_SEV ( 7*32+20) /* AMD Secure Encrypted Virtualization */
|
2017-04-08 08:33:52 +08:00
|
|
|
|
2018-01-28 00:24:32 +08:00
|
|
|
#define X86_FEATURE_USE_IBPB ( 7*32+21) /* "" Indirect Branch Prediction Barrier enabled */
|
2018-02-19 18:50:54 +08:00
|
|
|
#define X86_FEATURE_USE_IBRS_FW ( 7*32+22) /* "" Use IBRS during runtime firmware calls */
|
2017-04-08 08:33:52 +08:00
|
|
|
|
2016-01-27 05:12:04 +08:00
|
|
|
/* Virtualization flags: Linux defined, word 8 */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_TPR_SHADOW ( 8*32+ 0) /* Intel TPR Shadow */
|
|
|
|
|
#define X86_FEATURE_VNMI ( 8*32+ 1) /* Intel Virtual NMI */
|
|
|
|
|
#define X86_FEATURE_FLEXPRIORITY ( 8*32+ 2) /* Intel FlexPriority */
|
|
|
|
|
#define X86_FEATURE_EPT ( 8*32+ 3) /* Intel Extended Page Table */
|
|
|
|
|
#define X86_FEATURE_VPID ( 8*32+ 4) /* Intel Virtual Processor ID */
|
2016-01-27 05:12:04 +08:00
|
|
|
|
2017-10-31 20:17:23 +08:00
|
|
|
#define X86_FEATURE_VMMCALL ( 8*32+15) /* Prefer VMMCALL to VMCALL */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_XENPV ( 8*32+16) /* "" Xen paravirtual guest */
|
2016-01-27 05:12:04 +08:00
|
|
|
|
|
|
|
|
|
2017-10-31 20:17:23 +08:00
|
|
|
/* Intel-defined CPU features, CPUID level 0x00000007:0 (EBX), word 9 */
|
|
|
|
|
#define X86_FEATURE_FSGSBASE ( 9*32+ 0) /* RDFSBASE, WRFSBASE, RDGSBASE, WRGSBASE instructions*/
|
|
|
|
|
#define X86_FEATURE_TSC_ADJUST ( 9*32+ 1) /* TSC adjustment MSR 0x3B */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_BMI1 ( 9*32+ 3) /* 1st group bit manipulation extensions */
|
|
|
|
|
#define X86_FEATURE_HLE ( 9*32+ 4) /* Hardware Lock Elision */
|
|
|
|
|
#define X86_FEATURE_AVX2 ( 9*32+ 5) /* AVX2 instructions */
|
|
|
|
|
#define X86_FEATURE_SMEP ( 9*32+ 7) /* Supervisor Mode Execution Protection */
|
|
|
|
|
#define X86_FEATURE_BMI2 ( 9*32+ 8) /* 2nd group bit manipulation extensions */
|
2017-10-31 20:17:23 +08:00
|
|
|
#define X86_FEATURE_ERMS ( 9*32+ 9) /* Enhanced REP MOVSB/STOSB instructions */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_INVPCID ( 9*32+10) /* Invalidate Processor Context ID */
|
|
|
|
|
#define X86_FEATURE_RTM ( 9*32+11) /* Restricted Transactional Memory */
|
|
|
|
|
#define X86_FEATURE_CQM ( 9*32+12) /* Cache QoS Monitoring */
|
|
|
|
|
#define X86_FEATURE_MPX ( 9*32+14) /* Memory Protection Extension */
|
|
|
|
|
#define X86_FEATURE_RDT_A ( 9*32+15) /* Resource Director Technology Allocation */
|
|
|
|
|
#define X86_FEATURE_AVX512F ( 9*32+16) /* AVX-512 Foundation */
|
|
|
|
|
#define X86_FEATURE_AVX512DQ ( 9*32+17) /* AVX-512 DQ (Double/Quad granular) Instructions */
|
2017-10-31 20:17:23 +08:00
|
|
|
#define X86_FEATURE_RDSEED ( 9*32+18) /* RDSEED instruction */
|
|
|
|
|
#define X86_FEATURE_ADX ( 9*32+19) /* ADCX and ADOX instructions */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_SMAP ( 9*32+20) /* Supervisor Mode Access Prevention */
|
|
|
|
|
#define X86_FEATURE_AVX512IFMA ( 9*32+21) /* AVX-512 Integer Fused Multiply-Add instructions */
|
|
|
|
|
#define X86_FEATURE_CLFLUSHOPT ( 9*32+23) /* CLFLUSHOPT instruction */
|
|
|
|
|
#define X86_FEATURE_CLWB ( 9*32+24) /* CLWB instruction */
|
2018-01-16 23:42:25 +08:00
|
|
|
#define X86_FEATURE_INTEL_PT ( 9*32+25) /* Intel Processor Trace */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_AVX512PF ( 9*32+26) /* AVX-512 Prefetch */
|
|
|
|
|
#define X86_FEATURE_AVX512ER ( 9*32+27) /* AVX-512 Exponential and Reciprocal */
|
|
|
|
|
#define X86_FEATURE_AVX512CD ( 9*32+28) /* AVX-512 Conflict Detection */
|
|
|
|
|
#define X86_FEATURE_SHA_NI ( 9*32+29) /* SHA1/SHA256 Instruction Extensions */
|
|
|
|
|
#define X86_FEATURE_AVX512BW ( 9*32+30) /* AVX-512 BW (Byte/Word granular) Instructions */
|
|
|
|
|
#define X86_FEATURE_AVX512VL ( 9*32+31) /* AVX-512 VL (128/256 Vector Length) Extensions */
|
2016-01-27 05:12:04 +08:00
|
|
|
|
2017-10-31 20:17:23 +08:00
|
|
|
/* Extended state features, CPUID level 0x0000000d:1 (EAX), word 10 */
|
|
|
|
|
#define X86_FEATURE_XSAVEOPT (10*32+ 0) /* XSAVEOPT instruction */
|
|
|
|
|
#define X86_FEATURE_XSAVEC (10*32+ 1) /* XSAVEC instruction */
|
|
|
|
|
#define X86_FEATURE_XGETBV1 (10*32+ 2) /* XGETBV with ECX = 1 instruction */
|
|
|
|
|
#define X86_FEATURE_XSAVES (10*32+ 3) /* XSAVES/XRSTORS instructions */
|
2016-01-27 05:12:04 +08:00
|
|
|
|
2017-10-31 20:17:23 +08:00
|
|
|
/* Intel-defined CPU QoS Sub-leaf, CPUID level 0x0000000F:0 (EDX), word 11 */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_CQM_LLC (11*32+ 1) /* LLC QoS if 1 */
|
2016-01-27 05:12:04 +08:00
|
|
|
|
2017-10-31 20:17:23 +08:00
|
|
|
/* Intel-defined CPU QoS Sub-leaf, CPUID level 0x0000000F:1 (EDX), word 12 */
|
|
|
|
|
#define X86_FEATURE_CQM_OCCUP_LLC (12*32+ 0) /* LLC occupancy monitoring */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_CQM_MBM_TOTAL (12*32+ 1) /* LLC Total MBM monitoring */
|
|
|
|
|
#define X86_FEATURE_CQM_MBM_LOCAL (12*32+ 2) /* LLC Local MBM monitoring */
|
2016-01-27 05:12:04 +08:00
|
|
|
|
2017-10-31 20:17:23 +08:00
|
|
|
/* AMD-defined CPU features, CPUID level 0x80000008 (EBX), word 13 */
|
|
|
|
|
#define X86_FEATURE_CLZERO (13*32+ 0) /* CLZERO instruction */
|
|
|
|
|
#define X86_FEATURE_IRPERF (13*32+ 1) /* Instructions Retired Count */
|
2017-11-29 05:01:06 +08:00
|
|
|
#define X86_FEATURE_XSAVEERPTR (13*32+ 2) /* Always save/restore FP error pointers */
|
2018-01-28 00:24:32 +08:00
|
|
|
#define X86_FEATURE_IBPB (13*32+12) /* Indirect Branch Prediction Barrier */
|
|
|
|
|
#define X86_FEATURE_IBRS (13*32+14) /* Indirect Branch Restricted Speculation */
|
|
|
|
|
#define X86_FEATURE_STIBP (13*32+15) /* Single Thread Indirect Branch Predictors */
|
2016-01-27 05:12:04 +08:00
|
|
|
|
2017-10-31 20:17:23 +08:00
|
|
|
/* Thermal and Power Management Leaf, CPUID level 0x00000006 (EAX), word 14 */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_DTHERM (14*32+ 0) /* Digital Thermal Sensor */
|
|
|
|
|
#define X86_FEATURE_IDA (14*32+ 1) /* Intel Dynamic Acceleration */
|
|
|
|
|
#define X86_FEATURE_ARAT (14*32+ 2) /* Always Running APIC Timer */
|
|
|
|
|
#define X86_FEATURE_PLN (14*32+ 4) /* Intel Power Limit Notification */
|
|
|
|
|
#define X86_FEATURE_PTS (14*32+ 6) /* Intel Package Thermal Status */
|
|
|
|
|
#define X86_FEATURE_HWP (14*32+ 7) /* Intel Hardware P-states */
|
|
|
|
|
#define X86_FEATURE_HWP_NOTIFY (14*32+ 8) /* HWP Notification */
|
|
|
|
|
#define X86_FEATURE_HWP_ACT_WINDOW (14*32+ 9) /* HWP Activity Window */
|
|
|
|
|
#define X86_FEATURE_HWP_EPP (14*32+10) /* HWP Energy Perf. Preference */
|
|
|
|
|
#define X86_FEATURE_HWP_PKG_REQ (14*32+11) /* HWP Package Level Request */
|
2016-01-27 05:12:04 +08:00
|
|
|
|
2017-10-31 20:17:23 +08:00
|
|
|
/* AMD SVM Feature Identification, CPUID level 0x8000000a (EDX), word 15 */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_NPT (15*32+ 0) /* Nested Page Table support */
|
|
|
|
|
#define X86_FEATURE_LBRV (15*32+ 1) /* LBR Virtualization support */
|
|
|
|
|
#define X86_FEATURE_SVML (15*32+ 2) /* "svm_lock" SVM locking MSR */
|
|
|
|
|
#define X86_FEATURE_NRIPS (15*32+ 3) /* "nrip_save" SVM next_rip save */
|
|
|
|
|
#define X86_FEATURE_TSCRATEMSR (15*32+ 4) /* "tsc_scale" TSC scaling support */
|
|
|
|
|
#define X86_FEATURE_VMCBCLEAN (15*32+ 5) /* "vmcb_clean" VMCB clean bits support */
|
|
|
|
|
#define X86_FEATURE_FLUSHBYASID (15*32+ 6) /* flush-by-ASID support */
|
|
|
|
|
#define X86_FEATURE_DECODEASSISTS (15*32+ 7) /* Decode Assists support */
|
|
|
|
|
#define X86_FEATURE_PAUSEFILTER (15*32+10) /* filtered pause intercept */
|
|
|
|
|
#define X86_FEATURE_PFTHRESHOLD (15*32+12) /* pause filter threshold */
|
|
|
|
|
#define X86_FEATURE_AVIC (15*32+13) /* Virtual Interrupt Controller */
|
|
|
|
|
#define X86_FEATURE_V_VMSAVE_VMLOAD (15*32+15) /* Virtual VMSAVE VMLOAD */
|
|
|
|
|
#define X86_FEATURE_VGIF (15*32+16) /* Virtual GIF */
|
2016-01-27 05:12:04 +08:00
|
|
|
|
2017-10-31 20:17:23 +08:00
|
|
|
/* Intel-defined CPU features, CPUID level 0x00000007:0 (ECX), word 16 */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_AVX512VBMI (16*32+ 1) /* AVX512 Vector Bit Manipulation instructions*/
|
2017-11-06 10:27:51 +08:00
|
|
|
#define X86_FEATURE_UMIP (16*32+ 2) /* User Mode Instruction Protection */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_PKU (16*32+ 3) /* Protection Keys for Userspace */
|
|
|
|
|
#define X86_FEATURE_OSPKE (16*32+ 4) /* OS Protection Keys Enable */
|
|
|
|
|
#define X86_FEATURE_AVX512_VBMI2 (16*32+ 6) /* Additional AVX512 Vector Bit Manipulation Instructions */
|
|
|
|
|
#define X86_FEATURE_GFNI (16*32+ 8) /* Galois Field New Instructions */
|
|
|
|
|
#define X86_FEATURE_VAES (16*32+ 9) /* Vector AES */
|
2017-10-31 20:17:23 +08:00
|
|
|
#define X86_FEATURE_VPCLMULQDQ (16*32+10) /* Carry-Less Multiplication Double Quadword */
|
|
|
|
|
#define X86_FEATURE_AVX512_VNNI (16*32+11) /* Vector Neural Network Instructions */
|
|
|
|
|
#define X86_FEATURE_AVX512_BITALG (16*32+12) /* Support for VPOPCNT[B,W] and VPSHUF-BITQMB instructions */
|
2018-03-06 00:25:49 +08:00
|
|
|
#define X86_FEATURE_TME (16*32+13) /* Intel Total Memory Encryption */
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_FEATURE_AVX512_VPOPCNTDQ (16*32+14) /* POPCNT for vectors of DW/QW */
|
|
|
|
|
#define X86_FEATURE_LA57 (16*32+16) /* 5-level page tables */
|
|
|
|
|
#define X86_FEATURE_RDPID (16*32+22) /* RDPID instruction */
|
2016-03-11 06:12:13 +08:00
|
|
|
|
2017-10-31 20:17:23 +08:00
|
|
|
/* AMD-defined CPU features, CPUID level 0x80000007 (EBX), word 17 */
|
|
|
|
|
#define X86_FEATURE_OVERFLOW_RECOV (17*32+ 0) /* MCA overflow recovery support */
|
|
|
|
|
#define X86_FEATURE_SUCCOR (17*32+ 1) /* Uncorrectable error containment and recovery */
|
|
|
|
|
#define X86_FEATURE_SMCA (17*32+ 3) /* Scalable MCA */
|
2016-05-11 20:58:26 +08:00
|
|
|
|
2018-01-26 00:14:09 +08:00
|
|
|
/* Intel-defined CPU features, CPUID level 0x00000007:0 (EDX), word 18 */
|
|
|
|
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#define X86_FEATURE_AVX512_4VNNIW (18*32+ 2) /* AVX-512 Neural Network Instructions */
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#define X86_FEATURE_AVX512_4FMAPS (18*32+ 3) /* AVX-512 Multiply Accumulation Single precision */
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2018-03-06 00:25:51 +08:00
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#define X86_FEATURE_PCONFIG (18*32+18) /* Intel PCONFIG */
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2018-01-28 00:24:32 +08:00
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#define X86_FEATURE_SPEC_CTRL (18*32+26) /* "" Speculation Control (IBRS + IBPB) */
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#define X86_FEATURE_INTEL_STIBP (18*32+27) /* "" Single Thread Indirect Branch Predictors */
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2018-01-26 00:14:10 +08:00
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#define X86_FEATURE_ARCH_CAPABILITIES (18*32+29) /* IA32_ARCH_CAPABILITIES MSR (Intel) */
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2018-01-26 00:14:09 +08:00
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2016-01-27 05:12:04 +08:00
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/*
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* BUG word(s)
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*/
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2017-10-31 20:17:22 +08:00
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#define X86_BUG(x) (NCAPINTS*32 + (x))
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2016-01-27 05:12:04 +08:00
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2017-10-31 20:17:22 +08:00
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#define X86_BUG_F00F X86_BUG(0) /* Intel F00F */
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#define X86_BUG_FDIV X86_BUG(1) /* FPU FDIV */
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#define X86_BUG_COMA X86_BUG(2) /* Cyrix 6x86 coma */
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#define X86_BUG_AMD_TLB_MMATCH X86_BUG(3) /* "tlb_mmatch" AMD Erratum 383 */
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#define X86_BUG_AMD_APIC_C1E X86_BUG(4) /* "apic_c1e" AMD Erratum 400 */
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#define X86_BUG_11AP X86_BUG(5) /* Bad local APIC aka 11AP */
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#define X86_BUG_FXSAVE_LEAK X86_BUG(6) /* FXSAVE leaks FOP/FIP/FOP */
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#define X86_BUG_CLFLUSH_MONITOR X86_BUG(7) /* AAI65, CLFLUSH required before MONITOR */
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#define X86_BUG_SYSRET_SS_ATTRS X86_BUG(8) /* SYSRET doesn't fix up SS attrs */
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x86/entry/32: Introduce and use X86_BUG_ESPFIX instead of paravirt_enabled
x86_64 has very clean espfix handling on paravirt: espfix64 is set
up in native_iret, so paravirt systems that override iret bypass
espfix64 automatically. This is robust and straightforward.
x86_32 is messier. espfix is set up before the IRET paravirt patch
point, so it can't be directly conditionalized on whether we use
native_iret. We also can't easily move it into native_iret without
regressing performance due to a bizarre consideration. Specifically,
on 64-bit kernels, the logic is:
if (regs->ss & 0x4)
setup_espfix;
On 32-bit kernels, the logic is:
if ((regs->ss & 0x4) && (regs->cs & 0x3) == 3 &&
(regs->flags & X86_EFLAGS_VM) == 0)
setup_espfix;
The performance of setup_espfix itself is essentially irrelevant, but
the comparison happens on every IRET so its performance matters. On
x86_64, there's no need for any registers except flags to implement
the comparison, so we fold the whole thing into native_iret. On
x86_32, we don't do that because we need a free register to
implement the comparison efficiently. We therefore do espfix setup
before restoring registers on x86_32.
This patch gets rid of the explicit paravirt_enabled check by
introducing X86_BUG_ESPFIX on 32-bit systems and using an ALTERNATIVE
to skip espfix on paravirt systems where iret != native_iret. This is
also messy, but it's at least in line with other things we do.
This improves espfix performance by removing a branch, but no one
cares. More importantly, it removes a paravirt_enabled user, which is
good because paravirt_enabled is ill-defined and is going away.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luis R. Rodriguez <mcgrof@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: boris.ostrovsky@oracle.com
Cc: david.vrabel@citrix.com
Cc: konrad.wilk@oracle.com
Cc: lguest@lists.ozlabs.org
Cc: xen-devel@lists.xensource.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-03-01 07:50:19 +08:00
|
|
|
#ifdef CONFIG_X86_32
|
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|
|
/*
|
|
|
|
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* 64-bit kernels don't use X86_BUG_ESPFIX. Make the define conditional
|
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* to avoid confusion.
|
|
|
|
|
*/
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_BUG_ESPFIX X86_BUG(9) /* "" IRET to 16-bit SS corrupts ESP/RSP high bits */
|
x86/entry/32: Introduce and use X86_BUG_ESPFIX instead of paravirt_enabled
x86_64 has very clean espfix handling on paravirt: espfix64 is set
up in native_iret, so paravirt systems that override iret bypass
espfix64 automatically. This is robust and straightforward.
x86_32 is messier. espfix is set up before the IRET paravirt patch
point, so it can't be directly conditionalized on whether we use
native_iret. We also can't easily move it into native_iret without
regressing performance due to a bizarre consideration. Specifically,
on 64-bit kernels, the logic is:
if (regs->ss & 0x4)
setup_espfix;
On 32-bit kernels, the logic is:
if ((regs->ss & 0x4) && (regs->cs & 0x3) == 3 &&
(regs->flags & X86_EFLAGS_VM) == 0)
setup_espfix;
The performance of setup_espfix itself is essentially irrelevant, but
the comparison happens on every IRET so its performance matters. On
x86_64, there's no need for any registers except flags to implement
the comparison, so we fold the whole thing into native_iret. On
x86_32, we don't do that because we need a free register to
implement the comparison efficiently. We therefore do espfix setup
before restoring registers on x86_32.
This patch gets rid of the explicit paravirt_enabled check by
introducing X86_BUG_ESPFIX on 32-bit systems and using an ALTERNATIVE
to skip espfix on paravirt systems where iret != native_iret. This is
also messy, but it's at least in line with other things we do.
This improves espfix performance by removing a branch, but no one
cares. More importantly, it removes a paravirt_enabled user, which is
good because paravirt_enabled is ill-defined and is going away.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luis R. Rodriguez <mcgrof@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: boris.ostrovsky@oracle.com
Cc: david.vrabel@citrix.com
Cc: konrad.wilk@oracle.com
Cc: lguest@lists.ozlabs.org
Cc: xen-devel@lists.xensource.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-03-01 07:50:19 +08:00
|
|
|
#endif
|
2017-10-31 20:17:22 +08:00
|
|
|
#define X86_BUG_NULL_SEG X86_BUG(10) /* Nulling a selector preserves the base */
|
|
|
|
|
#define X86_BUG_SWAPGS_FENCE X86_BUG(11) /* SWAPGS without input dep on GS */
|
|
|
|
|
#define X86_BUG_MONITOR X86_BUG(12) /* IPI required to wake up remote CPU */
|
|
|
|
|
#define X86_BUG_AMD_E400 X86_BUG(13) /* CPU is among the affected by Erratum 400 */
|
2018-01-05 22:27:34 +08:00
|
|
|
#define X86_BUG_CPU_MELTDOWN X86_BUG(14) /* CPU is affected by meltdown attack and needs kernel page table isolation */
|
2018-01-06 19:49:23 +08:00
|
|
|
#define X86_BUG_SPECTRE_V1 X86_BUG(15) /* CPU is affected by Spectre variant 1 attack with conditional branches */
|
|
|
|
|
#define X86_BUG_SPECTRE_V2 X86_BUG(16) /* CPU is affected by Spectre variant 2 attack with indirect branches */
|
2017-10-31 20:17:23 +08:00
|
|
|
|
2016-01-27 05:12:04 +08:00
|
|
|
#endif /* _ASM_X86_CPUFEATURES_H */
|
