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Date: Tue, 19 Jan 2021 13:19:42 +0800
From: Feng Tang <feng.tang@...el.com>
To: Borislav Petkov <bp@...en8.de>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H . Peter Anvin" <hpa@...or.com>,
Dave Hansen <dave.hansen@...el.com>, x86@...nel.org,
linux-kernel@...r.kernel.org
Cc: nivedita@...m.mit.edu, thomas.lendacky@....com,
yazen.ghannam@....com, wei.huang2@....com,
Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH v4] tools/x86: Add a kcpuid tool to show raw CPU features
Sorry, after testing on more platforms, the following is needed to fix
a potential array overflow ((a full patch with fix is also attached)
diff --git a/tools/arch/x86/kcpuid/kcpuid.c b/tools/arch/x86/kcpuid/kcpuid.c
index 3ea607b..bf68335 100644
--- a/tools/arch/x86/kcpuid/kcpuid.c
+++ b/tools/arch/x86/kcpuid/kcpuid.c
@@ -329,7 +329,8 @@ static int parse_line(char *line)
range = leafs_basic;
index &= 0x7FFFFFFF;
- if ((int)index > range->nr)
+ /* range->nr equals to max index plus 1 */
+ if ((int)index >= range->nr)
return -1;
func = &range->funcs[index];
Thanks,
Feng
On Mon, Jan 18, 2021 at 03:35:11PM +0800, Feng Tang wrote:
> End users frequently want to know what features their processor
> supports, independent of what the kernel supports.
>
> /proc/cpuinfo is great. It is omnipresent and since it is provided by
> the kernel it is always as up to date as the kernel. But, it could be
> ambiguous about processor features which can be disabled by the kernel
> at boot-time or compile-time.
>
> There are some user space tools showing more raw features, but they are
> not bound with kernel, and go with distros. Many end users are still
> using old distros with new kernels (upgraded by themselves), and may
> not upgrade the distros only to get a newer tool.
>
> So here arise the need for a new tool, which
> * shows raw CPU features read from the CPUID instruction
> * will be easier to update compared to existing userspace
> tooling (perhaps distributed like perf)
> * inherits "modern" kernel development process, in contrast to some
> of the existing userspace CPUID tools which are still being developed
> without git and distributed in tarballs from non-https sites.
> * Can produce output consistent with /proc/cpuinfo to make comparison
> easier.
>
> The CPUID leaf definitions are kept in an .csv file which allows for
> updating only that file to add support for new feature leafs.
>
> This is based on prototype code from Borislav Petkov
> (http://sr71.net/~dave/intel/stupid-cpuid.c).
>
> [ bp: Massage, add #define _GNU_SOURCE to fix implicit declaration of
> function ‘strcasestr' warning. ]
>
> Originally-from: Borislav Petkov <bp@...en8.de>
> Suggested-by: Dave Hansen <dave.hansen@...el.com>
> Suggested-by: Borislav Petkov <bp@...en8.de>
> Signed-off-by: Feng Tang <feng.tang@...el.com>
> Signed-off-by: Borislav Petkov <bp@...e.de>
> Link: https://lkml.kernel.org/r/1603344083-100742-1-git-send-email-feng.tang@intel.com
> ---
> Changelog:
>
> v4:
> * rebase against 5.11-rc4
> * Boris helped to find and fix a segmentation fault and one
> compile warning
> * add more cpuid info into cpuid.csv
> * will show boolean bit flags only by default
> * some code cleanup
>
> v3:
> * use .csv file instead of plain text file which also uses
> comma to separate fields (Borislav)
> * add option to support a user specified .csv file (Dave)
> * make install will put the csv file under /usr/share/hwdata/ (Dave)
>
> v2:
> * use a new text file to store all the bits definition of each
> CPUID leaf/subleafs, which is easier for future expansion, as
> the core .c file will be kept untouched, suggested by Borislav/Dave
> * some code cleanup
>
> tools/arch/x86/kcpuid/Makefile | 24 ++
> tools/arch/x86/kcpuid/cpuid.csv | 380 +++++++++++++++++++++++
> tools/arch/x86/kcpuid/kcpuid.c | 645 ++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 1049 insertions(+)
> create mode 100644 tools/arch/x86/kcpuid/Makefile
> create mode 100644 tools/arch/x86/kcpuid/cpuid.csv
> create mode 100644 tools/arch/x86/kcpuid/kcpuid.c
>
> diff --git a/tools/arch/x86/kcpuid/Makefile b/tools/arch/x86/kcpuid/Makefile
> new file mode 100644
> index 0000000..87b554f
> --- /dev/null
> +++ b/tools/arch/x86/kcpuid/Makefile
> @@ -0,0 +1,24 @@
> +# SPDX-License-Identifier: GPL-2.0
> +# Makefile for x86/kcpuid tool
> +
> +kcpuid : kcpuid.c
> +
> +CFLAGS = -Wextra
> +
> +BINDIR ?= /usr/sbin
> +
> +HWDATADIR ?= /usr/share/misc/
> +
> +override CFLAGS += -O2 -Wall -I../../../include
> +
> +%: %.c
> + $(CC) $(CFLAGS) -o $@ $< $(LDFLAGS)
> +
> +.PHONY : clean
> +clean :
> + @rm -f kcpuid
> +
> +install : kcpuid
> + install -d $(DESTDIR)$(BINDIR)
> + install -m 755 -p kcpuid $(DESTDIR)$(BINDIR)/kcpuid
> + install -m 444 -p cpuid.csv $(HWDATADIR)/cpuid.csv
> diff --git a/tools/arch/x86/kcpuid/cpuid.csv b/tools/arch/x86/kcpuid/cpuid.csv
> new file mode 100644
> index 0000000..f4a5b85
> --- /dev/null
> +++ b/tools/arch/x86/kcpuid/cpuid.csv
> @@ -0,0 +1,380 @@
> +# The basic row format is:
> +# LEAF, SUBLEAF, register_name, bits, short_name, long_description
> +
> +# Leaf 00H
> + 0, 0, EAX, 31:0, max_basic_leafs, Max input value for supported subleafs
> +
> +# Leaf 01H
> + 1, 0, EAX, 3:0, stepping, Stepping ID
> + 1, 0, EAX, 7:4, model, Model
> + 1, 0, EAX, 11:8, family, Family ID
> + 1, 0, EAX, 13:12, processor, Processor Type
> + 1, 0, EAX, 19:16, model_ext, Extended Model ID
> + 1, 0, EAX, 27:20, family_ext, Extended Family ID
> +
> + 1, 0, EBX, 7:0, brand, Brand Index
> + 1, 0, EBX, 15:8, clflush_size, CLFLUSH line size (value * 8) in bytes
> + 1, 0, EBX, 23:16, max_cpu_id, Maxim number of addressable logic cpu in this package
> + 1, 0, EBX, 31:24, apic_id, Initial APIC ID
> +
> + 1, 0, ECX, 0, sse3, Streaming SIMD Extensions 3(SSE3)
> + 1, 0, ECX, 1, pclmulqdq, PCLMULQDQ instruction supported
> + 1, 0, ECX, 2, dtes64, DS area uses 64-bit layout
> + 1, 0, ECX, 3, mwait, MONITOR/MWAIT supported
> + 1, 0, ECX, 4, ds_cpl, CPL Qualified Debug Store which allows for branch message storage qualified by CPL
> + 1, 0, ECX, 5, vmx, Virtual Machine Extensions supported
> + 1, 0, ECX, 6, smx, Safer Mode Extension supported
> + 1, 0, ECX, 7, eist, Enhanced Intel SpeedStep Technology
> + 1, 0, ECX, 8, tm2, Thermal Monitor 2
> + 1, 0, ECX, 9, ssse3, Supplemental Streaming SIMD Extensions 3 (SSSE3)
> + 1, 0, ECX, 10, l1_ctx_id, L1 data cache could be set to either adaptive mode or shared mode (check IA32_MISC_ENABLE bit 24 definition)
> + 1, 0, ECX, 11, sdbg, IA32_DEBUG_INTERFACE MSR for silicon debug supported
> + 1, 0, ECX, 12, fma, FMA extensions using YMM state supported
> + 1, 0, ECX, 13, cmpxchg16b, 'CMPXCHG16B - Compare and Exchange Bytes' supported
> + 1, 0, ECX, 14, xtpr_update, xTPR Update Control supported
> + 1, 0, ECX, 15, pdcm, Perfmon and Debug Capability present
> + 1, 0, ECX, 17, pcid, Process-Context Identifiers feature present
> + 1, 0, ECX, 18, dca, Prefetching data from a memory mapped device supported
> + 1, 0, ECX, 19, sse4_1, SSE4.1 feature present
> + 1, 0, ECX, 20, sse4_2, SSE4.2 feature present
> + 1, 0, ECX, 21, x2apic, x2APIC supported
> + 1, 0, ECX, 22, movbe, MOVBE instruction supported
> + 1, 0, ECX, 23, popcnt, POPCNT instruction supported
> + 1, 0, ECX, 24, tsc_deadline_timer, LAPIC supports one-shot operation using a TSC deadline value
> + 1, 0, ECX, 25, aesni, AESNI instruction supported
> + 1, 0, ECX, 26, xsave, XSAVE/XRSTOR processor extended states (XSETBV/XGETBV/XCR0)
> + 1, 0, ECX, 27, osxsave, OS has set CR4.OSXSAVE bit to enable XSETBV/XGETBV/XCR0
> + 1, 0, ECX, 28, avx, AVX instruction supported
> + 1, 0, ECX, 29, f16c, 16-bit floating-point conversion instruction supported
> + 1, 0, ECX, 30, rdrand, RDRAND instruction supported
> +
> + 1, 0, EDX, 0, fpu, x87 FPU on chip
> + 1, 0, EDX, 1, vme, Virtual-8086 Mode Enhancement
> + 1, 0, EDX, 2, de, Debugging Extensions
> + 1, 0, EDX, 3, pse, Page Size Extensions
> + 1, 0, EDX, 4, tsc, Time Stamp Counter
> + 1, 0, EDX, 5, msr, RDMSR and WRMSR Support
> + 1, 0, EDX, 6, pae, Physical Address Extensions
> + 1, 0, EDX, 7, mce, Machine Check Exception
> + 1, 0, EDX, 8, cx8, CMPXCHG8B instr
> + 1, 0, EDX, 9, apic, APIC on Chip
> + 1, 0, EDX, 11, sep, SYSENTER and SYSEXIT instrs
> + 1, 0, EDX, 12, mtrr, Memory Type Range Registers
> + 1, 0, EDX, 13, pge, Page Global Bit
> + 1, 0, EDX, 14, mca, Machine Check Architecture
> + 1, 0, EDX, 15, cmov, Conditional Move Instrs
> + 1, 0, EDX, 16, pat, Page Attribute Table
> + 1, 0, EDX, 17, pse36, 36-Bit Page Size Extension
> + 1, 0, EDX, 18, psn, Processor Serial Number
> + 1, 0, EDX, 19, clflush, CLFLUSH instr
> +# 1, 0, EDX, 20,
> + 1, 0, EDX, 21, ds, Debug Store
> + 1, 0, EDX, 22, acpi, Thermal Monitor and Software Controlled Clock Facilities
> + 1, 0, EDX, 23, mmx, Intel MMX Technology
> + 1, 0, EDX, 24, fxsr, XSAVE and FXRSTOR Instrs
> + 1, 0, EDX, 25, sse, SSE
> + 1, 0, EDX, 26, sse2, SSE2
> + 1, 0, EDX, 27, ss, Self Snoop
> + 1, 0, EDX, 28, hit, Max APIC IDs
> + 1, 0, EDX, 29, tm, Thermal Monitor
> +# 1, 0, EDX, 30,
> + 1, 0, EDX, 31, pbe, Pending Break Enable
> +
> +# Leaf 02H
> +# cache and TLB descriptor info
> +
> +# Leaf 03H
> +# Precessor Serial Number, introduced on Pentium III, not valid for
> +# latest models
> +
> +# Leaf 04H
> +# thread/core and cache topology
> + 4, 0, EAX, 4:0, cache_type, Cache type like instr/data or unified
> + 4, 0, EAX, 7:5, cache_level, Cache Level (starts at 1)
> + 4, 0, EAX, 8, cache_self_init, Cache Self Initialization
> + 4, 0, EAX, 9, fully_associate, Fully Associative cache
> +# 4, 0, EAX, 13:10, resvd, resvd
> + 4, 0, EAX, 25:14, max_logical_id, Max number of addressable IDs for logical processors sharing the cache
> + 4, 0, EAX, 31:26, max_phy_id, Max number of addressable IDs for processors in phy package
> +
> + 4, 0, EBX, 11:0, cache_linesize, Size of a cache line in bytes
> + 4, 0, EBX, 21:12, cache_partition, Physical Line partitions
> + 4, 0, EBX, 31:22, cache_ways, Ways of associativity
> + 4, 0, ECX, 31:0, cache_sets, Number of Sets - 1
> + 4, 0, EDX, 0, c_wbinvd, 1 means WBINVD/INVD is not ganranteed to act upon lower level caches of non-originating threads sharing this cache
> + 4, 0, EDX, 1, c_incl, Whether cache is inclusive of lower cache level
> + 4, 0, EDX, 2, c_comp_index, Complex Cache Indexing
> +
> +# Leaf 05H
> +# MONITOR/MWAIT
> + 5, 0, EAX, 15:0, min_mon_size, Smallest monitor line size in bytes
> + 5, 0, EBX, 15:0, max_mon_size, Largest monitor line size in bytes
> + 5, 0, ECX, 0, mwait_ext, Enum of Monitor-Mwait extensions supported
> + 5, 0, ECX, 1, mwait_irq_break, Largest monitor line size in bytes
> + 5, 0, EDX, 3:0, c0_sub_stats, Number of C0* sub C-states supported using MWAIT
> + 5, 0, EDX, 7:4, c1_sub_stats, Number of C1* sub C-states supported using MWAIT
> + 5, 0, EDX, 11:8, c2_sub_stats, Number of C2* sub C-states supported using MWAIT
> + 5, 0, EDX, 15:12, c3_sub_stats, Number of C3* sub C-states supported using MWAIT
> + 5, 0, EDX, 19:16, c4_sub_stats, Number of C4* sub C-states supported using MWAIT
> + 5, 0, EDX, 23:20, c5_sub_stats, Number of C5* sub C-states supported using MWAIT
> + 5, 0, EDX, 27:24, c6_sub_stats, Number of C6* sub C-states supported using MWAIT
> + 5, 0, EDX, 31:28, c7_sub_stats, Number of C7* sub C-states supported using MWAIT
> +
> +# Leaf 06H
> +# Thermal & Power Management
> +
> + 6, 0, EAX, 0, dig_temp, Digital temperature sensor supported
> + 6, 0, EAX, 1, turbo, Intel Turbo Boost
> + 6, 0, EAX, 2, arat, Always running APIC timer
> +# 6, 0, EAX, 3, resv, Reserved
> + 6, 0, EAX, 4, pln, Power limit notifications supported
> + 6, 0, EAX, 5, ecmd, Clock modulation duty cycle extension supported
> + 6, 0, EAX, 6, ptm, Package thermal management supported
> + 6, 0, EAX, 7, hwp, HWP base register
> + 6, 0, EAX, 8, hwp_notify, HWP notification
> + 6, 0, EAX, 9, hwp_act_window, HWP activity window
> + 6, 0, EAX, 10, hwp_energy, HWP energy performance preference
> + 6, 0, EAX, 11, hwp_pkg_req, HWP package level request
> +# 6, 0, EAX, 12, resv, Reserved
> + 6, 0, EAX, 13, hdc, HDC base registers supported
> + 6, 0, EAX, 14, turbo3, Turbo Boost Max 3.0
> + 6, 0, EAX, 15, hwp_cap, Highest Performance change supported
> + 6, 0, EAX, 16, hwp_peci, HWP PECI override is supported
> + 6, 0, EAX, 17, hwp_flex, Flexible HWP is supported
> + 6, 0, EAX, 18, hwp_fast, Fast access mode for the IA32_HWP_REQUEST MSR is supported
> +# 6, 0, EAX, 19, resv, Reserved
> + 6, 0, EAX, 20, hwp_ignr, Ignoring Idle Logical Processor HWP request is supported
> +
> + 6, 0, EBX, 3:0, therm_irq_thresh, Number of Interrupt Thresholds in Digital Thermal Sensor
> + 6, 0, ECX, 0, aperfmperf, Presence of IA32_MPERF and IA32_APERF
> + 6, 0, ECX, 3, energ_bias, Performance-energy bias preference supported
> +
> +# Leaf 07H
> +# ECX == 0
> +# AVX512 refers to https://en.wikipedia.org/wiki/AVX-512
> +# XXX: Do we really need to enumerate each and every AVX512 sub features
> +
> + 7, 0, EBX, 0, fsgsbase, RDFSBASE/RDGSBASE/WRFSBASE/WRGSBASE supported
> + 7, 0, EBX, 1, tsc_adjust, TSC_ADJUST MSR supported
> + 7, 0, EBX, 2, sgx, Software Guard Extensions
> + 7, 0, EBX, 3, bmi1, BMI1
> + 7, 0, EBX, 4, hle, Hardware Lock Elision
> + 7, 0, EBX, 5, avx2, AVX2
> +# 7, 0, EBX, 6, fdp_excp_only, x87 FPU Data Pointer updated only on x87 exceptions
> + 7, 0, EBX, 7, smep, Supervisor-Mode Execution Prevention
> + 7, 0, EBX, 8, bmi2, BMI2
> + 7, 0, EBX, 9, rep_movsb, Enhanced REP MOVSB/STOSB
> + 7, 0, EBX, 10, invpcid, INVPCID instruction
> + 7, 0, EBX, 11, rtm, Restricted Transactional Memory
> + 7, 0, EBX, 12, rdt_m, Intel RDT Monitoring capability
> + 7, 0, EBX, 13, depc_fpu_cs_ds, Deprecates FPU CS and FPU DS
> + 7, 0, EBX, 14, mpx, Memory Protection Extensions
> + 7, 0, EBX, 15, rdt_a, Intel RDT Allocation capability
> + 7, 0, EBX, 16, avx512f, AVX512 Foundation instr
> + 7, 0, EBX, 17, avx512dq, AVX512 Double and Quadword AVX512 instr
> + 7, 0, EBX, 18, rdseed, RDSEED instr
> + 7, 0, EBX, 19, adx, ADX instr
> + 7, 0, EBX, 20, smap, Supervisor Mode Access Prevention
> + 7, 0, EBX, 21, avx512ifma, AVX512 Integer Fused Multiply Add
> +# 7, 0, EBX, 22, resvd, resvd
> + 7, 0, EBX, 23, clflushopt, CLFLUSHOPT instr
> + 7, 0, EBX, 24, clwb, CLWB instr
> + 7, 0, EBX, 25, intel_pt, Intel Processor Trace instr
> + 7, 0, EBX, 26, avx512pf, Prefetch
> + 7, 0, EBX, 27, avx512er, AVX512 Exponent Reciproca instr
> + 7, 0, EBX, 28, avx512cd, AVX512 Conflict Detection instr
> + 7, 0, EBX, 29, sha, Intel Secure Hash Algorithm Extensions instr
> + 7, 0, EBX, 26, avx512bw, AVX512 Byte & Word instr
> + 7, 0, EBX, 28, avx512vl, AVX512 Vector Length Extentions (VL)
> + 7, 0, ECX, 0, prefetchwt1, X
> + 7, 0, ECX, 1, avx512vbmi, AVX512 Vector Byte Manipulation Instructions
> + 7, 0, ECX, 2, umip, User-mode Instruction Prevention
> +
> + 7, 0, ECX, 3, pku, Protection Keys for User-mode pages
> + 7, 0, ECX, 4, ospke, CR4 PKE set to enable protection keys
> +# 7, 0, ECX, 16:5, resvd, resvd
> + 7, 0, ECX, 21:17, mawau, The value of MAWAU used by the BNDLDX and BNDSTX instructions in 64-bit mode
> + 7, 0, ECX, 22, rdpid, RDPID and IA32_TSC_AUX
> +# 7, 0, ECX, 29:23, resvd, resvd
> + 7, 0, ECX, 30, sgx_lc, SGX Launch Configuration
> +# 7, 0, ECX, 31, resvd, resvd
> +
> +# Leaf 08H
> +#
> +
> +
> +# Leaf 09H
> +# Direct Cache Access (DCA) information
> + 9, 0, ECX, 31:0, dca_cap, The value of IA32_PLATFORM_DCA_CAP
> +
> +# Leaf 0AH
> +# Architectural Performance Monitoring
> +#
> +# Do we really need to print out the PMU related stuff?
> +# Does normal user really care about it?
> +#
> + 0xA, 0, EAX, 7:0, pmu_ver, Performance Monitoring Unit version
> + 0xA, 0, EAX, 15:8, pmu_gp_cnt_num, Numer of general-purose PMU counters per logical CPU
> + 0xA, 0, EAX, 23:16, pmu_cnt_bits, Bit wideth of PMU counter
> + 0xA, 0, EAX, 31:24, pmu_ebx_bits, Length of EBX bit vector to enumerate PMU events
> +
> + 0xA, 0, EBX, 0, pmu_no_core_cycle_evt, Core cycle event not available
> + 0xA, 0, EBX, 1, pmu_no_instr_ret_evt, Instruction retired event not available
> + 0xA, 0, EBX, 2, pmu_no_ref_cycle_evt, Reference cycles event not available
> + 0xA, 0, EBX, 3, pmu_no_llc_ref_evt, Last-level cache reference event not available
> + 0xA, 0, EBX, 4, pmu_no_llc_mis_evt, Last-level cache misses event not available
> + 0xA, 0, EBX, 5, pmu_no_br_instr_ret_evt, Branch instruction retired event not available
> + 0xA, 0, EBX, 6, pmu_no_br_mispredict_evt, Branch mispredict retired event not available
> +
> + 0xA, 0, ECX, 4:0, pmu_fixed_cnt_num, Performance Monitoring Unit version
> + 0xA, 0, ECX, 12:5, pmu_fixed_cnt_bits, Numer of PMU counters per logical CPU
> +
> +# Leaf 0BH
> +# Extended Topology Enumeration Leaf
> +#
> +
> + 0xB, 0, EAX, 4:0, id_shift, Number of bits to shift right on x2APIC ID to get a unique topology ID of the next level type
> + 0xB, 0, EBX, 15:0, cpu_nr, Number of logical processors at this level type
> + 0xB, 0, ECX, 15:8, lvl_type, 0-Invalid 1-SMT 2-Core
> + 0xB, 0, EDX, 31:0, x2apic_id, x2APIC ID the current logical processor
> +
> +
> +# Leaf 0DH
> +# Processor Extended State
> +
> + 0xD, 0, EAX, 0, x87, X87 state
> + 0xD, 0, EAX, 1, sse, SSE state
> + 0xD, 0, EAX, 2, avx, AVX state
> + 0xD, 0, EAX, 4:3, mpx, MPX state
> + 0xD, 0, EAX, 7:5, avx512, AVX-512 state
> + 0xD, 0, EAX, 9, pkru, PKRU state
> +
> + 0xD, 0, EBX, 31:0, max_sz_xcr0, Maximum size (bytes) required by enabled features in XCR0
> + 0xD, 0, ECX, 31:0, max_sz_xsave, Maximum size (bytes) of the XSAVE/XRSTOR save area
> +
> + 0xD, 1, EAX, 0, xsaveopt, XSAVEOPT available
> + 0xD, 1, EAX, 1, xsavec, XSAVEC and compacted form supported
> + 0xD, 1, EAX, 2, xgetbv, XGETBV supported
> + 0xD, 1, EAX, 3, xsaves, XSAVES/XRSTORS and IA32_XSS supported
> +
> + 0xD, 1, EBX, 31:0, max_sz_xcr0, Maximum size (bytes) required by enabled features in XCR0
> + 0xD, 1, ECX, 8, pt, PT state
> + 0xD, 1, ECX, 11, cet_usr, CET user state
> + 0xD, 1, ECX, 12, cet_supv, CET supervisor state
> + 0xD, 1, ECX, 13, hdc, HDC state
> + 0xD, 1, ECX, 16, hwp, HWP state
> +
> +# Leaf 0FH
> +# Intel RDT Monitoring
> +
> + 0xF, 0, EBX, 31:0, rmid_range, Maximum range (zero-based) of RMID within this physical processor of all types
> + 0xF, 0, EDX, 1, l3c_rdt_mon, L3 Cache RDT Monitoring supported
> +
> + 0xF, 1, ECX, 31:0, rmid_range, Maximum range (zero-based) of RMID of this types
> + 0xF, 1, EDX, 0, l3c_ocp_mon, L3 Cache occupancy Monitoring supported
> + 0xF, 1, EDX, 1, l3c_tbw_mon, L3 Cache Total Bandwidth Monitoring supported
> + 0xF, 1, EDX, 2, l3c_lbw_mon, L3 Cache Local Bandwidth Monitoring supported
> +
> +# Leaf 10H
> +# Intel RDT Allocation
> +
> + 0x10, 0, EBX, 1, l3c_rdt_alloc, L3 Cache Allocation supported
> + 0x10, 0, EBX, 2, l2c_rdt_alloc, L2 Cache Allocation supported
> + 0x10, 0, EBX, 3, mem_bw_alloc, Memory Bandwidth Allocation supported
> +
> +
> +# Leaf 12H
> +# SGX Capability
> +#
> +# Some detailed SGX features not added yet
> +
> + 0x12, 0, EAX, 0, sgx1, L3 Cache Allocation supported
> + 0x12, 1, EAX, 0, sgx2, L3 Cache Allocation supported
> +
> +
> +# Leaf 14H
> +# Intel Processor Tracer
> +#
> +
> +# Leaf 15H
> +# Time Stamp Counter and Nominal Core Crystal Clock Information
> +
> + 0x15, 0, EAX, 31:0, tsc_denominator, The denominator of the TSC/”core crystal clock” ratio
> + 0x15, 0, EBX, 31:0, tsc_numerator, The numerator of the TSC/”core crystal clock” ratio
> + 0x15, 0, ECX, 31:0, nom_freq, Nominal frequency of the core crystal clock in Hz
> +
> +# Leaf 16H
> +# Processor Frequency Information
> +
> + 0x16, 0, EAX, 15:0, cpu_base_freq, Processor Base Frequency in MHz
> + 0x16, 0, EBX, 15:0, cpu_max_freq, Maximum Frequency in MHz
> + 0x16, 0, ECX, 15:0, bus_freq, Bus (Reference) Frequency in MHz
> +
> +# Leaf 17H
> +# System-On-Chip Vendor Attribute
> +
> + 0x17, 0, EAX, 31:0, max_socid, Maximum input value of supported sub-leaf
> + 0x17, 0, EBX, 15:0, soc_vid, SOC Vendor ID
> + 0x17, 0, EBX, 16, std_vid, SOC Vendor ID is assigned via an industry standard scheme
> + 0x17, 0, ECX, 31:0, soc_pid, SOC Project ID assigned by vendor
> + 0x17, 0, EDX, 31:0, soc_sid, SOC Stepping ID
> +
> +# Leaf 18H
> +# Deterministic Address Translation Parameters
> +
> +
> +# Leaf 19H
> +# Key Locker Leaf
> +
> +
> +# Leaf 1AH
> +# Hybrid Information
> +
> + 0x1A, 0, EAX, 31:24, core_type, 20H-Intel_Atom 40H-Intel_Core
> +
> +
> +# Leaf 1FH
> +# V2 Extended Topology - A preferred superset to leaf 0BH
> +
> +
> +# According to SDM
> +# 40000000H - 4FFFFFFFH is invalid range
> +
> +
> +# Leaf 80000001H
> +# Extended Processor Signature and Feature Bits
> +
> +0x80000001, 0, ECX, 0, lahf_lm, LAHF/SAHF available in 64-bit mode
> +0x80000001, 0, ECX, 5, lzcnt, LZCNT
> +0x80000001, 0, ECX, 8, prefetchw, PREFETCHW
> +
> +0x80000001, 0, EDX, 11, sysret, SYSCALL/SYSRET supported
> +0x80000001, 0, EDX, 20, exec_dis, Execute Disable Bit available
> +0x80000001, 0, EDX, 26, 1gb_page, 1GB page supported
> +0x80000001, 0, EDX, 27, rdtscp, RDTSCP and IA32_TSC_AUX are available
> +#0x80000001, 0, EDX, 29, 64b, 64b Architecture supported
> +
> +# Leaf 80000002H/80000003H/80000004H
> +# Processor Brand String
> +
> +# Leaf 80000005H
> +# Reserved
> +
> +# Leaf 80000006H
> +# Extended L2 Cache Features
> +
> +0x80000006, 0, ECX, 7:0, clsize, Cache Line size in bytes
> +0x80000006, 0, ECX, 15:12, l2c_assoc, L2 Associativity
> +0x80000006, 0, ECX, 31:16, csize, Cache size in 1K units
> +
> +
> +# Leaf 80000007H
> +
> +0x80000007, 0, EDX, 8, nonstop_tsc, Invariant TSC available
> +
> +
> +# Leaf 80000008H
> +
> +0x80000008, 0, EAX, 7:0, phy_adr_bits, Physical Address Bits
> +0x80000008, 0, EAX, 15:8, lnr_adr_bits, Linear Address Bits
> +0x80000007, 0, EBX, 9, wbnoinvd, WBNOINVD
> diff --git a/tools/arch/x86/kcpuid/kcpuid.c b/tools/arch/x86/kcpuid/kcpuid.c
> new file mode 100644
> index 0000000..3ea607b
> --- /dev/null
> +++ b/tools/arch/x86/kcpuid/kcpuid.c
> @@ -0,0 +1,645 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#define _GNU_SOURCE
> +
> +#include <stdio.h>
> +#include <stdbool.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <getopt.h>
> +
> +#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
> +
> +typedef unsigned int u32;
> +typedef unsigned long long u64;
> +
> +char *def_csv = "/usr/share/misc/cpuid.csv";
> +char *user_csv;
> +
> +
> +/* Cover both single-bit flag and multiple-bits fields */
> +struct bits_desc {
> + int start, end; /* start and end bits */
> + int value; /* 0 or 1 for 1-bit flag */
> + char simp[32];
> + char detail[256];
> +};
> +
> +/* descriptor info for eax/ebx/ecx/edx */
> +struct reg_desc {
> + int nr; /* number of valid entries */
> + struct bits_desc descs[32];
> +};
> +
> +enum {
> + R_EAX = 0,
> + R_EBX,
> + R_ECX,
> + R_EDX,
> + NR_REGS
> +};
> +
> +struct subleaf {
> + u32 index;
> + u32 sub;
> + u32 eax, ebx, ecx, edx;
> + struct reg_desc info[NR_REGS]; /* eax, ebx, ecx, edx */
> +};
> +
> +/* Represent one leaf (basic or extended) */
> +struct cpuid_func {
> + /*
> + * Array of subleafs for this func, if there is no subleafs
> + * then the leafs[0] is the main leaf
> + */
> + struct subleaf *leafs;
> + int nr;
> +};
> +
> +struct cpuid_range {
> + struct cpuid_func *funcs; /* array of main leafs */
> + int nr; /* number of valid leafs */
> + bool is_ext;
> +};
> +
> +/*
> + * basic: basic functions started from 0
> + * ext: extended functions started from 0x80000000
> + */
> +struct cpuid_range *leafs_basic, *leafs_ext;
> +
> +static int num_leafs;
> +static bool is_amd;
> +static bool show_details;
> +static bool show_raw;
> +static bool show_flags_only = true;
> +static u32 user_index = 0xFFFFFFFF;
> +static u32 user_sub = 0xFFFFFFFF;
> +static int flines;
> +
> +static inline void cpuid(u32 *eax, u32 *ebx, u32 *ecx, u32 *edx)
> +{
> + /* ecx is often an input as well as an output. */
> + asm volatile("cpuid"
> + : "=a" (*eax),
> + "=b" (*ebx),
> + "=c" (*ecx),
> + "=d" (*edx)
> + : "0" (*eax), "2" (*ecx));
> +}
> +
> +static inline bool has_subleafs(u32 f)
> +{
> + if (f == 0x7 || f == 0xd)
> + return true;
> +
> + if (is_amd) {
> + if (f == 0x8000001d)
> + return true;
> + return false;
> + }
> +
> + switch (f) {
> + case 0x4:
> + case 0xb:
> + case 0xf:
> + case 0x10:
> + case 0x14:
> + case 0x18:
> + case 0x1f:
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> +static void leaf_print_raw(struct subleaf *leaf)
> +{
> + if (has_subleafs(leaf->index)) {
> + if (leaf->sub == 0)
> + printf("0x%08x: subleafs:\n", leaf->index);
> +
> + printf(" %2d: EAX=0x%08x, EBX=0x%08x, ECX=0x%08x, EDX=0x%08x\n",
> + leaf->sub, leaf->eax, leaf->ebx, leaf->ecx, leaf->edx);
> + } else {
> + printf("0x%08x: EAX=0x%08x, EBX=0x%08x, ECX=0x%08x, EDX=0x%08x\n",
> + leaf->index, leaf->eax, leaf->ebx, leaf->ecx, leaf->edx);
> + }
> +}
> +
> +/* Return true is the input eax/ebx/ecx/edx are all zero */
> +static bool cpuid_store(struct cpuid_range *range, u32 f, int subleaf,
> + u32 a, u32 b, u32 c, u32 d)
> +{
> + struct cpuid_func *func;
> + struct subleaf *leaf;
> + int s = 0;
> +
> + if (a == 0 && b == 0 && c == 0 && d == 0)
> + return true;
> +
> + /*
> + * Cut off vendor-prefix from CPUID function as we're using it as an
> + * index into ->funcs.
> + */
> + func = &range->funcs[f & 0xffff];
> +
> + if (!func->leafs) {
> + func->leafs = malloc(sizeof(struct subleaf));
> + if (!func->leafs)
> + perror("malloc func leaf");
> +
> + func->nr = 1;
> + } else {
> + s = func->nr;
> + func->leafs = realloc(func->leafs, (s + 1) * sizeof(*leaf));
> + if (!func->leafs)
> + perror("realloc f->leafs");
> +
> + func->nr++;
> + }
> +
> + leaf = &func->leafs[s];
> +
> + leaf->index = f;
> + leaf->sub = subleaf;
> + leaf->eax = a;
> + leaf->ebx = b;
> + leaf->ecx = c;
> + leaf->edx = d;
> +
> + return false;
> +}
> +
> +static void raw_dump_range(struct cpuid_range *range)
> +{
> + u32 f;
> + int i;
> +
> + printf("\n%s Leafs :\n", range->is_ext ? "Extended" : "Basic");
> + printf("================\n");
> +
> + for (f = 0; (int)f < range->nr; f++) {
> + struct cpuid_func *func = &range->funcs[f];
> + u32 index = f;
> +
> + if (range->is_ext)
> + index += 0x80000000;
> +
> + /* Skip leaf without valid items */
> + if (!func->nr)
> + continue;
> +
> + /* First item is the main leaf, followed by all subleafs */
> + for (i = 0; i < func->nr; i++)
> + leaf_print_raw(&func->leafs[i]);
> + }
> +}
> +
> +#define MAX_SUBLEAF_NUM 32
> +struct cpuid_range *setup_cpuid_range(u32 input_eax)
> +{
> + u32 max_func, idx_func;
> + int subleaf;
> + struct cpuid_range *range;
> + u32 eax, ebx, ecx, edx;
> + u32 f = input_eax;
> + int max_subleaf;
> + bool allzero;
> +
> + eax = input_eax;
> + ebx = ecx = edx = 0;
> +
> + cpuid(&eax, &ebx, &ecx, &edx);
> + max_func = eax;
> + idx_func = (max_func & 0xffff) + 1;
> +
> + range = malloc(sizeof(struct cpuid_range));
> + if (!range)
> + perror("malloc range");
> +
> + if (input_eax & 0x80000000)
> + range->is_ext = true;
> + else
> + range->is_ext = false;
> +
> + range->funcs = malloc(sizeof(struct cpuid_func) * idx_func);
> + if (!range->funcs)
> + perror("malloc range->funcs");
> +
> + range->nr = idx_func;
> + memset(range->funcs, 0, sizeof(struct cpuid_func) * idx_func);
> +
> + for (; f <= max_func; f++) {
> + eax = f;
> + subleaf = ecx = 0;
> +
> + cpuid(&eax, &ebx, &ecx, &edx);
> + allzero = cpuid_store(range, f, subleaf, eax, ebx, ecx, edx);
> + if (allzero)
> + continue;
> + num_leafs++;
> +
> + if (!has_subleafs(f))
> + continue;
> +
> + max_subleaf = MAX_SUBLEAF_NUM;
> +
> + /*
> + * Some can provide the exact number of subleafs,
> + * others have to be tried (0xf)
> + */
> + if (f == 0x7 || f == 0x14 || f == 0x17 || f == 0x18)
> + max_subleaf = (eax & 0xff) + 1;
> +
> + if (f == 0xb)
> + max_subleaf = 2;
> +
> + for (subleaf = 1; subleaf < max_subleaf; subleaf++) {
> + eax = f;
> + ecx = subleaf;
> +
> + cpuid(&eax, &ebx, &ecx, &edx);
> + allzero = cpuid_store(range, f, subleaf,
> + eax, ebx, ecx, edx);
> + if (allzero)
> + continue;
> + num_leafs++;
> + }
> +
> + }
> +
> + return range;
> +}
> +
> +/*
> + * The basic row format for cpuid.csv is
> + * LEAF,SUBLEAF,register_name,bits,short name,long description
> + *
> + * like:
> + * 0, 0, EAX, 31:0, max_basic_leafs, Max input value for supported subleafs
> + * 1, 0, ECX, 0, sse3, Streaming SIMD Extensions 3(SSE3)
> + */
> +static int parse_line(char *line)
> +{
> + char *str;
> + int i;
> + struct cpuid_range *range;
> + struct cpuid_func *func;
> + struct subleaf *leaf;
> + u32 index;
> + u32 sub;
> + char buffer[512];
> + char *buf;
> + /*
> + * Tokens:
> + * 1. leaf
> + * 2. subleaf
> + * 3. register
> + * 4. bits
> + * 5. short name
> + * 6. long detail
> + */
> + char *tokens[6];
> + struct reg_desc *reg;
> + struct bits_desc *bdesc;
> + int reg_index;
> + char *start, *end;
> +
> + /* Skip comments and NULL line */
> + if (line[0] == '#' || line[0] == '\n')
> + return 0;
> +
> + strncpy(buffer, line, 511);
> + buffer[511] = 0;
> + str = buffer;
> + for (i = 0; i < 5; i++) {
> + tokens[i] = strtok(str, ",");
> + if (!tokens[i])
> + goto err_exit;
> + str = NULL;
> + }
> + tokens[5] = strtok(str, "\n");
> +
> + /* index/main-leaf */
> + index = strtoull(tokens[0], NULL, 0);
> +
> + if (index & 0x80000000)
> + range = leafs_ext;
> + else
> + range = leafs_basic;
> +
> + index &= 0x7FFFFFFF;
> + if ((int)index > range->nr)
> + return -1;
> +
> + func = &range->funcs[index];
> +
> + /* Return if the index has no valid item on this platform */
> + if (!func->nr)
> + return 0;
> +
> + /* subleaf */
> + sub = strtoul(tokens[1], NULL, 0);
> + if ((int)sub > func->nr)
> + return -1;
> +
> + leaf = &func->leafs[sub];
> + buf = tokens[2];
> +
> + if (strcasestr(buf, "EAX"))
> + reg_index = R_EAX;
> + else if (strcasestr(buf, "EBX"))
> + reg_index = R_EBX;
> + else if (strcasestr(buf, "ECX"))
> + reg_index = R_ECX;
> + else if (strcasestr(buf, "EDX"))
> + reg_index = R_EDX;
> + else
> + goto err_exit;
> +
> + reg = &leaf->info[reg_index];
> + bdesc = ®->descs[reg->nr++];
> +
> + /* bit flag or bits field */
> + buf = tokens[3];
> +
> + end = strtok(buf, ":");
> + bdesc->end = strtoul(end, NULL, 0);
> + bdesc->start = bdesc->end;
> +
> + /* start != NULL means it is bit fields */
> + start = strtok(NULL, ":");
> + if (start)
> + bdesc->start = strtoul(start, NULL, 0);
> +
> + strcpy(bdesc->simp, tokens[4]);
> + strcpy(bdesc->detail, tokens[5]);
> + return 0;
> +
> +err_exit:
> + printf("Warning: wrong line format:\n");
> + printf("\tline[%d]: %s\n", flines, line);
> + return -1;
> +}
> +
> +/* Parse csv file, and construct the array of all leafs and subleafs */
> +static void parse_text(void)
> +{
> + FILE *file;
> + char *filename, *line = NULL;
> + size_t len = 0;
> + int ret;
> +
> + if (show_raw)
> + return;
> +
> + filename = user_csv ? user_csv : def_csv;
> + file = fopen(filename, "r");
> + if (!file) {
> + printf("Fail to open '%s'\n", filename);
> + return;
> + }
> +
> + while (1) {
> + ret = getline(&line, &len, file);
> + flines++;
> + if (ret > 0)
> + parse_line(line);
> +
> + if (feof(file))
> + break;
> + }
> +
> + fclose(file);
> +}
> +
> +
> +/* Decode every eax/ebx/ecx/edx */
> +static void decode_bits(u32 value, struct reg_desc *rdesc)
> +{
> + struct bits_desc *bdesc;
> + int start, end, i;
> + u32 mask;
> +
> + for (i = 0; i < rdesc->nr; i++) {
> + bdesc = &rdesc->descs[i];
> +
> + start = bdesc->start;
> + end = bdesc->end;
> + if (start == end) {
> + /* single bit flag */
> + if (value & (1 << start))
> + printf("\t%-20s %s%s\n",
> + bdesc->simp,
> + show_details ? "-" : "",
> + show_details ? bdesc->detail : ""
> + );
> + } else {
> + /* bit fields */
> + if (show_flags_only)
> + continue;
> +
> + mask = ((u64)1 << (end - start + 1)) - 1;
> + printf("\t%-20s\t: 0x%-8x\t%s%s\n",
> + bdesc->simp,
> + (value >> start) & mask,
> + show_details ? "-" : "",
> + show_details ? bdesc->detail : ""
> + );
> + }
> + }
> +}
> +
> +static void show_leaf(struct subleaf *leaf)
> +{
> + if (!leaf)
> + return;
> +
> + if (show_raw)
> + leaf_print_raw(leaf);
> +
> + decode_bits(leaf->eax, &leaf->info[R_EAX]);
> + decode_bits(leaf->ebx, &leaf->info[R_EBX]);
> + decode_bits(leaf->ecx, &leaf->info[R_ECX]);
> + decode_bits(leaf->edx, &leaf->info[R_EDX]);
> +}
> +
> +static void show_func(struct cpuid_func *func)
> +{
> + int i;
> +
> + if (!func)
> + return;
> +
> + for (i = 0; i < func->nr; i++)
> + show_leaf(&func->leafs[i]);
> +}
> +
> +static void show_range(struct cpuid_range *range)
> +{
> + int i;
> +
> + for (i = 0; i < range->nr; i++)
> + show_func(&range->funcs[i]);
> +}
> +
> +static inline struct cpuid_func *index_to_func(u32 index)
> +{
> + struct cpuid_range *range;
> +
> + range = (index & 0x80000000) ? leafs_ext : leafs_basic;
> + index &= 0x7FFFFFFF;
> +
> + if (((index & 0xFFFF) + 1) > (u32)range->nr) {
> + printf("ERR: invalid input index (0x%x)\n", index);
> + return NULL;
> + }
> + return &range->funcs[index];
> +}
> +
> +static void show_info(void)
> +{
> + struct cpuid_func *func;
> +
> + if (show_raw) {
> + /* Show all of the raw output of 'cpuid' instr */
> + raw_dump_range(leafs_basic);
> + raw_dump_range(leafs_ext);
> + return;
> + }
> +
> + if (user_index != 0xFFFFFFFF) {
> + /* Only show specific leaf/subleaf info */
> + func = index_to_func(user_index);
> + if (!func)
> + return;
> +
> + /* Dump the raw data also */
> + show_raw = true;
> +
> + if (user_sub != 0xFFFFFFFF) {
> + if (user_sub + 1 <= (u32)func->nr) {
> + show_leaf(&func->leafs[user_sub]);
> + return;
> + }
> +
> + printf("ERR: invalid input subleaf (0x%x)\n", user_sub);
> + }
> +
> + show_func(func);
> + return;
> + }
> +
> + printf("CPU features:\n=============\n\n");
> + show_range(leafs_basic);
> + show_range(leafs_ext);
> +}
> +
> +static void setup_platform_cpuid(void)
> +{
> + u32 eax, ebx, ecx, edx;
> +
> + /* Check vendor */
> + eax = ebx = ecx = edx = 0;
> + cpuid(&eax, &ebx, &ecx, &edx);
> +
> + /* "htuA" */
> + if (ebx == 0x68747541)
> + is_amd = true;
> +
> + /* Setup leafs for the basic and extended range */
> + leafs_basic = setup_cpuid_range(0x0);
> + leafs_ext = setup_cpuid_range(0x80000000);
> +}
> +
> +static void usage(void)
> +{
> + printf(" usage: kcpuid [-abdfhr] [-l leaf] [-s subleaf]\n"
> + "\t-a|--all Show both bit flags and complex bit fields info\n"
> + "\t-b|--bitflags Show boolean flags only\n"
> + "\t-d|--detail Show details of the flag/fields (default)\n"
> + "\t-f|--flags Specify the cpuid csv file\n"
> + "\t-h|--help Show usage info\n"
> + "\t-l|--leaf=index Specify the leaf you want to check\n"
> + "\t-r|--raw Show raw cpuid data\n"
> + "\t-s|--subleaf=sub Specify the subleaf you want to check\n"
> + "\n"
> + );
> +}
> +
> +static struct option opts[] = {
> + { "all", no_argument, NULL, 'a' }, /* show both bit flags and fields */
> + { "bitflags", no_argument, NULL, 'b' }, /* only show bit flags, default on */
> + { "detail", no_argument, NULL, 'd' }, /* show detail descriptions */
> + { "file", required_argument, NULL, 'f' }, /* use user's cpuid file */
> + { "help", no_argument, NULL, 'h'}, /* show usage */
> + { "leaf", required_argument, NULL, 'l'}, /* only check a specific leaf */
> + { "raw", no_argument, NULL, 'r'}, /* show raw CPUID leaf data */
> + { "subleaf", required_argument, NULL, 's'}, /* check a specific subleaf */
> + { NULL, 0, NULL, 0 }
> +};
> +
> +static int parse_options(int argc, char *argv[])
> +{
> + int c;
> +
> + while ((c = getopt_long(argc, argv, "abdf:hl:rs:",
> + opts, NULL)) != -1)
> + switch (c) {
> + case 'a':
> + show_flags_only = false;
> + break;
> + case 'b':
> + show_flags_only = true;
> + break;
> + case 'd':
> + show_details = true;
> + break;
> + case 'f':
> + user_csv = optarg;
> + break;
> + case 'h':
> + usage();
> + exit(1);
> + break;
> + case 'l':
> + /* main leaf */
> + user_index = strtoul(optarg, NULL, 0);
> + break;
> + case 'r':
> + show_raw = true;
> + break;
> + case 's':
> + /* subleaf */
> + user_sub = strtoul(optarg, NULL, 0);
> + break;
> + default:
> + printf("%s: Invalid option '%c'\n", argv[0], optopt);
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * Do 4 things in turn:
> + * 1. Parse user options
> + * 2. Parse and store all the CPUID leaf data supported on this platform
> + * 2. Parse the csv file, while skipping leafs which are not available
> + * on this platform
> + * 3. Print leafs info based on uers options
> + */
> +int main(int argc, char *argv[])
> +{
> + if (parse_options(argc, argv))
> + return -1;
> +
> + /* Setup the cpuid leafs of current platform */
> + setup_platform_cpuid();
> +
> + /* Read and parse the 'cpuid.csv' */
> + parse_text();
> +
> + show_info();
> + return 0;
> +}
> --
> 2.7.4
View attachment "v4-updated-0001-tools-x86-Add-a-kcpuid-tool-to-show-raw-CPU-features.patch" of type "text/x-diff" (36345 bytes)
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