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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 cpu updates from Dave Hansen:
- Complete LASS enabling: deal with vsyscall and EFI
The existing Linear Address Space Separation (LASS) support punted
on support for common EFI and vsyscall configs. Complete the
implementation by supporting EFI and vsyscall=xonly.
- Clean up CPUID usage in newer Intel "avs" audio driver and update the
x86-cpuid-db file
* tag 'x86_cpu_for_7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
tools/x86/kcpuid: Update bitfields to x86-cpuid-db v3.0
ASoC: Intel: avs: Include CPUID header at file scope
ASoC: Intel: avs: Check maximum valid CPUID leaf
x86/cpu: Remove LASS restriction on vsyscall emulation
x86/vsyscall: Disable LASS if vsyscall mode is set to EMULATE
x86/vsyscall: Restore vsyscall=xonly mode under LASS
x86/traps: Consolidate user fixups in the #GP handler
x86/vsyscall: Reorganize the page fault emulation code
x86/cpu: Remove LASS restriction on EFI
x86/efi: Disable LASS while executing runtime services
x86/cpu: Defer LASS enabling until userspace comes up
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull performance events updates from Ingo Molnar:
"Core updates:
- Try to allocate task_ctx_data quickly, to optimize O(N^2) algorithm
on large systems with O(100k) threads (Namhyung Kim)
AMD PMU driver IBS support updates and fixes, by Ravi Bangoria:
- Fix interrupt accounting for discarded samples
- Fix a Zen5-specific quirk
- Fix PhyAddrVal handling
- Fix NMI-safety with perf_allow_kernel()
- Fix a race between event add and NMIs
Intel PMU driver updates:
- Only check GP counters for PEBS constraints validation (Dapeng Mi)
MSR driver:
- Turn SMI_COUNT and PPERF on by default, instead of a long list of
CPU models to enable them on (Kan Liang)
... and misc cleanups and fixes by Aldf Conte, Anshuman Khandual,
Namhyung Kim, Ravi Bangoria and Yen-Hsiang Hsu"
* tag 'perf-core-2026-04-13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/events: Replace READ_ONCE() with standard pgtable accessors
perf/x86/msr: Make SMI and PPERF on by default
perf/x86/intel/p4: Fix unused variable warning in p4_pmu_init()
perf/x86/intel: Only check GP counters for PEBS constraints validation
perf/x86/amd/ibs: Fix comment typo in ibs_op_data
perf/amd/ibs: Advertise remote socket capability
perf/amd/ibs: Enable streaming store filter
perf/amd/ibs: Enable RIP bit63 hardware filtering
perf/amd/ibs: Enable fetch latency filtering
perf/amd/ibs: Support IBS_{FETCH|OP}_CTL2[Dis] to eliminate RMW race
perf/amd/ibs: Add new MSRs and CPUID bits definitions
perf/amd/ibs: Define macro for ldlat mask and shift
perf/amd/ibs: Avoid race between event add and NMI
perf/amd/ibs: Avoid calling perf_allow_kernel() from the IBS NMI handler
perf/amd/ibs: Preserve PhyAddrVal bit when clearing PhyAddr MSR
perf/amd/ibs: Limit ldlat->l3missonly dependency to Zen5
perf/amd/ibs: Account interrupt for discarded samples
perf/core: Simplify __detach_global_ctx_data()
perf/core: Try to allocate task_ctx_data quickly
perf/core: Pass GFP flags to attach_task_ctx_data()
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull objtool updates from Ingo Molnar:
- KLP support updates and fixes (Song Liu)
- KLP-build script updates and fixes (Joe Lawrence)
- Support Clang RAX DRAP sequence, to address clang false positive
(Josh Poimboeuf)
- Reorder ORC register numbering to match regular x86 register
numbering (Josh Poimboeuf)
- Misc cleanups (Wentong Tian, Song Liu)
* tag 'objtool-core-2026-04-13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
objtool/x86: Reorder ORC register numbering
objtool: Support Clang RAX DRAP sequence
livepatch/klp-build: report patch validation fuzz
livepatch/klp-build: add terminal color output
livepatch/klp-build: provide friendlier error messages
livepatch/klp-build: improve short-circuit validation
livepatch/klp-build: fix shellcheck complaints
livepatch/klp-build: add Makefile with check target
livepatch/klp-build: add grep-override function
livepatch/klp-build: switch to GNU patch and recountdiff
livepatch/klp-build: support patches that add/remove files
objtool/klp: Correlate locals to globals
objtool/klp: Match symbols based on demangled_name for global variables
objtool/klp: Remove .llvm suffix in demangle_name()
objtool/klp: Also demangle global objects
objtool/klp: Use sym->demangled_name for symbol_name hash
objtool/klp: Remove trailing '_' in demangle_name()
objtool/klp: Remove redundant strcmp() in correlate_symbols()
objtool: Use section/symbol type helpers
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ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/superm1/linux
Pull amd-pstate new content for 7.1 (2026-04-02) from Mario Limonciello:
"Add support for new features:
* CPPC performance priority
* Dynamic EPP
* Raw EPP
* New unit tests for new features
Fixes for:
* PREEMPT_RT
* sysfs files being present when HW missing
* Broken/outdated documentation"
* tag 'amd-pstate-v7.1-2026-04-02' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/superm1/linux: (22 commits)
MAINTAINERS: amd-pstate: Step down as maintainer, add Prateek as reviewer
cpufreq: Pass the policy to cpufreq_driver->adjust_perf()
cpufreq/amd-pstate: Pass the policy to amd_pstate_update()
cpufreq/amd-pstate-ut: Add a unit test for raw EPP
cpufreq/amd-pstate: Add support for raw EPP writes
cpufreq/amd-pstate: Add support for platform profile class
cpufreq/amd-pstate: add kernel command line to override dynamic epp
cpufreq/amd-pstate: Add dynamic energy performance preference
Documentation: amd-pstate: fix dead links in the reference section
cpufreq/amd-pstate: Cache the max frequency in cpudata
Documentation/amd-pstate: Add documentation for amd_pstate_floor_{freq,count}
Documentation/amd-pstate: List amd_pstate_prefcore_ranking sysfs file
Documentation/amd-pstate: List amd_pstate_hw_prefcore sysfs file
amd-pstate-ut: Add a testcase to validate the visibility of driver attributes
amd-pstate-ut: Add module parameter to select testcases
amd-pstate: Introduce a tracepoint trace_amd_pstate_cppc_req2()
amd-pstate: Add sysfs support for floor_freq and floor_count
amd-pstate: Add support for CPPC_REQ2 and FLOOR_PERF
x86/cpufeatures: Add AMD CPPC Performance Priority feature.
amd-pstate: Make certain freq_attrs conditionally visible
...
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Some future AMD processors have feature named "CPPC Performance
Priority" which lets userspace specify different floor performance
levels for different CPUs. The platform firmware takes these different
floor performance levels into consideration while throttling the CPUs
under power/thermal constraints. The presence of this feature is
indicated by bit 16 of the EDX register for CPUID leaf
0x80000007. More details can be found in AMD Publication titled "AMD64
Collaborative Processor Performance Control (CPPC) Performance
Priority" Revision 1.10.
Define a new feature bit named X86_FEATURE_CPPC_PERF_PRIO to map to
CPUID 0x80000007.EDX[16].
Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
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Update kcpuid's CSV to version 3.0, as generated by x86-cpuid-db.
Summary of the v2.5 changes:
- Reduce the verbosity of leaf and bitfields descriptions, as formerly
requested by Boris.
- Leaf 0x8000000a: Add Page Modification Logging (PML) bit.
Summary of the v3.0 changes:
- Leaf 0x23: Introduce subleaf 2, Auto Counter Reload (ACR)
- Leaf 0x23: Introduce subleaf 4/5, PEBS capabilities and counters
- Leaf 0x1c: Return LBR depth as a bitmask instead of individual bits
- Leaf 0x0a: Use more descriptive PMU bitfield names
- Leaf 0x0a: Add various missing PMU events
- Leaf 0x06: Add missing IA32_HWP_CTL flag
- Leaf 0x0f: Add missing non-CPU (IO) Intel RDT bits
Thanks to Dave Hansen for reporting multiple missing bits.
Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://gitlab.com/x86-cpuid.org/x86-cpuid-db/-/blob/v2.5/CHANGELOG.rst
Link: https://gitlab.com/x86-cpuid.org/x86-cpuid-db/-/blob/v3.0/CHANGELOG.rst
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To pick the changes in:
e2ffe85b6d2bb778 ("KVM: x86: Introduce KVM_X86_QUIRK_VMCS12_ALLOW_FREEZE_IN_SMM")
That just rebuilds kvm-stat.c on x86, no change in functionality.
This silences these perf build warning:
Warning: Kernel ABI header differences:
diff -u tools/arch/x86/include/uapi/asm/kvm.h arch/x86/include/uapi/asm/kvm.h
Please see tools/include/uapi/README for further details.
Cc: Jim Mattson <jmattson@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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To pick up the changes from these csets:
9073428bb204d921 ("x86/sev: Allow IBPB-on-Entry feature for SNP guests")
That cause no changes to tooling as it doesn't include a new MSR to be
captured by the tools/perf/trace/beauty/tracepoints/x86_msr.sh script.
Just silences this perf build warning:
Warning: Kernel ABI header differences:
diff -u tools/arch/x86/include/asm/msr-index.h arch/x86/include/asm/msr-index.h
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Reorder the ORC register values so their ordering matches the x86
instruction set register encodings.
No functional change intended.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
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Recent Clang can use RAX as a temporary register for the DRAP stack
alignment sequence. Add support for that.
Fixes the following warning:
vmlinux.o: error: objtool: vmw_host_printf+0xd: unknown CFA base reg 0
Closes: https://lore.kernel.org/cefefdd1-7b82-406d-8ff4-e4b167e45ee6@app.fastmail.com
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/3f33dc720b83dc6d3a2b7094f75a5c90a0b1cbc5.1773708458.git.jpoimboe@kernel.org
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The comment for tag_to_ret_ctr in ibs_op_data says "15-31"
but it should be "16-31".
Fix the misleading comment. No functional changes.
Signed-off-by: Yen-Hsiang Hsu <rrrrr4413@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260113141830.3204114-1-rrrrr4413@gmail.com
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To get the comment changes in this commit:
171efc70097a9f5f ("x86/ibs: Fix typo in dc_l2tlb_miss comment")
This silences this perf build warning:
Warning: Kernel ABI header differences:
diff -u tools/arch/x86/include/asm/amd/ibs.h arch/x86/include/asm/amd/ibs.h
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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MSR_{OMR_[0-3],CORE_PERF_GLOBAL_STATUS_SET}
To pick up the changes in:
4e955c08d6dc76fb ("perf/x86/intel: Support the 4 new OMR MSRs introduced in DMR and NVL")
736a2dcfdae72483 ("x86/CPU/AMD: Simplify the spectral chicken fix")
56bb2736975068cc ("KVM: x86/pmu: Load/put mediated PMU context when entering/exiting guest")
Addressing this tools/perf build warning:
Warning: Kernel ABI header differences:
diff -u tools/arch/x86/include/asm/msr-index.h arch/x86/include/asm/msr-index.h
That makes the beautification scripts to pick some new entries:
$ tools/perf/trace/beauty/tracepoints/x86_msr.sh > before.txt
$ cp arch/x86/include/asm/msr-index.h tools/arch/x86/include/asm/msr-index.h
$ tools/perf/trace/beauty/tracepoints/x86_msr.sh > after.txt
$ diff -u before.txt after.txt
--- before.txt 2026-03-04 17:21:39.165956041 -0300
+++ after.txt 2026-03-04 17:21:52.479191640 -0300
@@ -130,6 +130,11 @@
[0x0000038e] = "CORE_PERF_GLOBAL_STATUS",
[0x0000038f] = "CORE_PERF_GLOBAL_CTRL",
[0x00000390] = "CORE_PERF_GLOBAL_OVF_CTRL",
+ [0x00000391] = "CORE_PERF_GLOBAL_STATUS_SET",
+ [0x000003e0] = "OMR_0",
+ [0x000003e1] = "OMR_1",
+ [0x000003e2] = "OMR_2",
+ [0x000003e3] = "OMR_3",
[0x000003f1] = "IA32_PEBS_ENABLE",
[0x000003f2] = "PEBS_DATA_CFG",
[0x000003f4] = "IA32_PEBS_BASE",
$
Now one can use those strings in 'perf trace' to do filtering, e.g.:
# perf trace -e msr:*_msr/max-stack=32/ --filter="msr==CORE_PERF_GLOBAL_STATUS_SET"
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Dapeng Mi <dapeng1.mi@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sean Christopherson <seanjc@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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To pick the changes in:
6517dfbcc918f970 ("KVM: x86: Add x2APIC "features" to control EOI broadcast suppression")
20c3c4108d58f87c ("KVM: SEV: Add KVM_SEV_SNP_ENABLE_REQ_CERTS command")
This silences these perf build warning:
Warning: Kernel ABI header differences:
diff -u tools/arch/x86/include/uapi/asm/kvm.h arch/x86/include/uapi/asm/kvm.h
Please see tools/include/uapi/README for further details.
Cc: Sean Christopherson <seanjc@google.com>
Cc: Khushit Shah <khushit.shah@nutanix.com>
Cc: Michael Roth <michael.roth@amd.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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To pick the changes from:
f24ef0093dd8cf60 ("KVM: x86: Advertise MOVRS CPUID to userspace")
f49ecf5e110ab0ed ("x86/cpufeature: Replace X86_FEATURE_SYSENTER32 with X86_FEATURE_SYSFAST32")
db5e82496492b489 ("KVM: SVM: Virtualize and advertise support for ERAPS")
This causes these perf files to be rebuilt and brings some X86_FEATURE
that may be used by:
CC /tmp/build/perf/bench/mem-memcpy-x86-64-asm.o
CC /tmp/build/perf/bench/mem-memset-x86-64-asm.o
And addresses this perf build warning:
Warning: Kernel ABI header differences:
diff -u tools/arch/x86/include/asm/cpufeatures.h arch/x86/include/asm/cpufeatures.h
Please see tools/include/uapi/README for further details.
Cc: Amit Shah <amit.shah@amd.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Pick up upstream work and
d9b40d7262a2 ("selftests/x86: Add selftests include path for kselftest.h after centralization")
especially which is a build fix needed for a selftests cleanup coming
ontop of this.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
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msr_set_bit() takes a bit number to set but MSR_ZEN2_SPECTRAL_CHICKEN_BIT
is a bit mask. The usual pattern that code uses is a _BIT-named type
macro instead of a mask.
So convert it to a bit number to reflect that.
Also, msr_set_bit() already does the reading and checking whether the
bit needs to be set so use that instead of a local variable.
Fixup tabbing while at it.
No functional changes.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Nikolay Borisov <nik.borisov@suse.com>
Link: https://patch.msgid.link/20251230110731.28108-1-bp@kernel.org
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To pick up changes from:
54de197c9a5e8f52 ("Merge tag 'x86_sgx_for_6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip")
679fcce0028bf101 ("Merge tag 'kvm-x86-svm-6.19' of https://github.com/kvm-x86/linux into HEAD")
3767def18f4cc394 ("x86/cpufeatures: Add support for L3 Smart Data Cache Injection Allocation Enforcement")
f6106d41ec84e552 ("x86/bugs: Use an x86 feature to track the MMIO Stale Data mitigation")
7baadd463e147fdc ("x86/cpufeatures: Enumerate the LASS feature bits")
47955b58cf9b97fe ("x86/cpufeatures: Correct LKGS feature flag description")
5d0316e25defee47 ("x86/cpufeatures: Add X86_FEATURE_X2AVIC_EXT")
6ffdb49101f02313 ("x86/cpufeatures: Add X86_FEATURE_SGX_EUPDATESVN feature flag")
4793f990ea152330 ("KVM: x86: Advertise EferLmsleUnsupported to userspace")
bb5f13df3c455110 ("perf/x86/intel: Add counter group support for arch-PEBS")
52448a0a739002ec ("perf/x86/intel: Setup PEBS data configuration and enable legacy groups")
d21954c8a0ffbc94 ("perf/x86/intel: Process arch-PEBS records or record fragments")
bffeb2fd0b9c99d8 ("x86/microcode/intel: Enable staging when available")
740144bc6bde9d44 ("x86/microcode/intel: Establish staging control logic")
This should address these tools/perf build warnings:
Warning: Kernel ABI header differences:
diff -u tools/arch/x86/include/asm/cpufeatures.h arch/x86/include/asm/cpufeatures.h
diff -u tools/arch/x86/include/asm/msr-index.h arch/x86/include/asm/msr-index.h
Please see tools/include/uapi/README.
Cc: x86@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
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To pick up changes from:
ad9c62bd8946621e ("KVM: arm64: VM exit to userspace to handle SEA")
8e8678e740ecde2a ("KVM: s390: Add capability that forwards operation exceptions")
e0c26d47def7382d ("Merge tag 'kvm-s390-next-6.19-1' of https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD")
7a61d61396b97fd6 ("KVM: SEV: Publish supported SEV-SNP policy bits")
This should be used to beautify DRM syscall arguments and it addresses
these tools/perf build warnings:
Warning: Kernel ABI header differences:
diff -u tools/include/uapi/linux/kvm.h include/uapi/linux/kvm.h
diff -u tools/arch/x86/include/uapi/asm/kvm.h arch/x86/include/uapi/asm/kvm.h
Please see tools/include/uapi/README.
Cc: kvm@vger.kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 CPU feature updates from Dave Hansen:
"The biggest thing of note here is Linear Address Space Separation
(LASS). It represents the first time I can think of that the
upper=>kernel/lower=>user address space convention is actually
recognized by the hardware on x86. It ensures that userspace can not
even get the hardware to _start_ page walks for the kernel address
space. This, of course, is a really nice generic side channel defense.
This is really only a down payment on LASS support. There are still
some details to work out in its interaction with EFI calls and
vsyscall emulation. For now, LASS is disabled if either of those
features is compiled in (which is almost always the case).
There's also one straggler commit in here which converts an
under-utilized AMD CPU feature leaf into a generic Linux-defined leaf
so more feature can be packed in there.
Summary:
- Enable Linear Address Space Separation (LASS)
- Change X86_FEATURE leaf 17 from an AMD leaf to Linux-defined"
* tag 'x86_cpu_for_6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/cpu: Enable LASS during CPU initialization
selftests/x86: Update the negative vsyscall tests to expect a #GP
x86/traps: Communicate a LASS violation in #GP message
x86/kexec: Disable LASS during relocate kernel
x86/alternatives: Disable LASS when patching kernel code
x86/asm: Introduce inline memcpy and memset
x86/cpu: Add an LASS dependency on SMAP
x86/cpufeatures: Enumerate the LASS feature bits
x86/cpufeatures: Make X86_FEATURE leaf 17 Linux-specific
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 cleanups from Borislav Petkov:
- The mandatory pile of cleanups the cat drags in every merge window
* tag 'x86_cleanups_for_v6.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/boot: Clean up whitespace in a20.c
x86/mm: Delete disabled debug code
x86/{boot,mtrr}: Remove unused function declarations
x86/percpu: Use BIT_WORD() and BIT_MASK() macros
x86/cpufeatures: Correct LKGS feature flag description
x86/idtentry: Add missing '*' to kernel-doc lines
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull performance events updates from Ingo Molnar:
"Callchain support:
- Add support for deferred user-space stack unwinding for perf,
enabled on x86. (Peter Zijlstra, Steven Rostedt)
- unwind_user/x86: Enable frame pointer unwinding on x86 (Josh
Poimboeuf)
x86 PMU support and infrastructure:
- x86/insn: Simplify for_each_insn_prefix() (Peter Zijlstra)
- x86/insn,uprobes,alternative: Unify insn_is_nop() (Peter Zijlstra)
Intel PMU driver:
- Large series to prepare for and implement architectural PEBS
support for Intel platforms such as Clearwater Forest (CWF) and
Panther Lake (PTL). (Dapeng Mi, Kan Liang)
- Check dynamic constraints (Kan Liang)
- Optimize PEBS extended config (Peter Zijlstra)
- cstates:
- Remove PC3 support from LunarLake (Zhang Rui)
- Add Pantherlake support (Zhang Rui)
- Clearwater Forest support (Zide Chen)
AMD PMU driver:
- x86/amd: Check event before enable to avoid GPF (George Kennedy)
Fixes and cleanups:
- task_work: Fix NMI race condition (Peter Zijlstra)
- perf/x86: Fix NULL event access and potential PEBS record loss
(Dapeng Mi)
- Misc other fixes and cleanups (Dapeng Mi, Ingo Molnar, Peter
Zijlstra)"
* tag 'perf-core-2025-12-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (38 commits)
perf/x86/intel: Fix and clean up intel_pmu_drain_arch_pebs() type use
perf/x86/intel: Optimize PEBS extended config
perf/x86/intel: Check PEBS dyn_constraints
perf/x86/intel: Add a check for dynamic constraints
perf/x86/intel: Add counter group support for arch-PEBS
perf/x86/intel: Setup PEBS data configuration and enable legacy groups
perf/x86/intel: Update dyn_constraint base on PEBS event precise level
perf/x86/intel: Allocate arch-PEBS buffer and initialize PEBS_BASE MSR
perf/x86/intel: Process arch-PEBS records or record fragments
perf/x86/intel/ds: Factor out PEBS group processing code to functions
perf/x86/intel/ds: Factor out PEBS record processing code to functions
perf/x86/intel: Initialize architectural PEBS
perf/x86/intel: Correct large PEBS flag check
perf/x86/intel: Replace x86_pmu.drain_pebs calling with static call
perf/x86: Fix NULL event access and potential PEBS record loss
perf/x86: Remove redundant is_x86_event() prototype
entry,unwind/deferred: Fix unwind_reset_info() placement
unwind_user/x86: Fix arch=um build
perf: Support deferred user unwind
unwind_user/x86: Teach FP unwind about start of function
...
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull objtool updates from Ingo Molnar:
- klp-build livepatch module generation (Josh Poimboeuf)
Introduce new objtool features and a klp-build script to generate
livepatch modules using a source .patch as input.
This builds on concepts from the longstanding out-of-tree kpatch
project which began in 2012 and has been used for many years to
generate livepatch modules for production kernels. However, this is a
complete rewrite which incorporates hard-earned lessons from 12+
years of maintaining kpatch.
Key improvements compared to kpatch-build:
- Integrated with objtool: Leverages objtool's existing control-flow
graph analysis to help detect changed functions.
- Works on vmlinux.o: Supports late-linked objects, making it
compatible with LTO, IBT, and similar.
- Simplified code base: ~3k fewer lines of code.
- Upstream: No more out-of-tree #ifdef hacks, far less cruft.
- Cleaner internals: Vastly simplified logic for
symbol/section/reloc inclusion and special section extraction.
- Robust __LINE__ macro handling: Avoids false positive binary diffs
caused by the __LINE__ macro by introducing a fix-patch-lines
script which injects #line directives into the source .patch to
preserve the original line numbers at compile time.
- Disassemble code with libopcodes instead of running objdump
(Alexandre Chartre)
- Disassemble support (-d option to objtool) by Alexandre Chartre,
which supports the decoding of various Linux kernel code generation
specials such as alternatives:
17ef: sched_balance_find_dst_group+0x62f mov 0x34(%r9),%edx
17f3: sched_balance_find_dst_group+0x633 | <alternative.17f3> | X86_FEATURE_POPCNT
17f3: sched_balance_find_dst_group+0x633 | call 0x17f8 <__sw_hweight64> | popcnt %rdi,%rax
17f8: sched_balance_find_dst_group+0x638 cmp %eax,%edx
... jump table alternatives:
1895: sched_use_asym_prio+0x5 test $0x8,%ch
1898: sched_use_asym_prio+0x8 je 0x18a9 <sched_use_asym_prio+0x19>
189a: sched_use_asym_prio+0xa | <jump_table.189a> | JUMP
189a: sched_use_asym_prio+0xa | jmp 0x18ae <sched_use_asym_prio+0x1e> | nop2
189c: sched_use_asym_prio+0xc mov $0x1,%eax
18a1: sched_use_asym_prio+0x11 and $0x80,%ecx
... exception table alternatives:
native_read_msr:
5b80: native_read_msr+0x0 mov %edi,%ecx
5b82: native_read_msr+0x2 | <ex_table.5b82> | EXCEPTION
5b82: native_read_msr+0x2 | rdmsr | resume at 0x5b84 <native_read_msr+0x4>
5b84: native_read_msr+0x4 shl $0x20,%rdx
.... x86 feature flag decoding (also see the X86_FEATURE_POPCNT
example in sched_balance_find_dst_group() above):
2faaf: start_thread_common.constprop.0+0x1f jne 0x2fba4 <start_thread_common.constprop.0+0x114>
2fab5: start_thread_common.constprop.0+0x25 | <alternative.2fab5> | X86_FEATURE_ALWAYS | X86_BUG_NULL_SEG
2fab5: start_thread_common.constprop.0+0x25 | jmp 0x2faba <.altinstr_aux+0x2f4> | jmp 0x4b0 <start_thread_common.constprop.0+0x3f> | nop5
2faba: start_thread_common.constprop.0+0x2a mov $0x2b,%eax
... NOP sequence shortening:
1048e2: snapshot_write_finalize+0xc2 je 0x104917 <snapshot_write_finalize+0xf7>
1048e4: snapshot_write_finalize+0xc4 nop6
1048ea: snapshot_write_finalize+0xca nop11
1048f5: snapshot_write_finalize+0xd5 nop11
104900: snapshot_write_finalize+0xe0 mov %rax,%rcx
104903: snapshot_write_finalize+0xe3 mov 0x10(%rdx),%rax
... and much more.
- Function validation tracing support (Alexandre Chartre)
- Various -ffunction-sections fixes (Josh Poimboeuf)
- Clang AutoFDO (Automated Feedback-Directed Optimizations) support
(Josh Poimboeuf)
- Misc fixes and cleanups (Borislav Petkov, Chen Ni, Dylan Hatch, Ingo
Molnar, John Wang, Josh Poimboeuf, Pankaj Raghav, Peter Zijlstra,
Thorsten Blum)
* tag 'objtool-core-2025-12-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (129 commits)
objtool: Fix segfault on unknown alternatives
objtool: Build with disassembly can fail when including bdf.h
objtool: Trim trailing NOPs in alternative
objtool: Add wide output for disassembly
objtool: Compact output for alternatives with one instruction
objtool: Improve naming of group alternatives
objtool: Add Function to get the name of a CPU feature
objtool: Provide access to feature and flags of group alternatives
objtool: Fix address references in alternatives
objtool: Disassemble jump table alternatives
objtool: Disassemble exception table alternatives
objtool: Print addresses with alternative instructions
objtool: Disassemble group alternatives
objtool: Print headers for alternatives
objtool: Preserve alternatives order
objtool: Add the --disas=<function-pattern> action
objtool: Do not validate IBT for .return_sites and .call_sites
objtool: Improve tracing of alternative instructions
objtool: Add functions to better name alternatives
objtool: Identify the different types of alternatives
...
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Add a function to get the name of a CPU feature. The function is
architecture dependent and currently only implemented for x86. The
feature names are automatically generated from the cpufeatures.h
include file.
Signed-off-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://patch.msgid.link/20251121095340.464045-27-alexandre.chartre@oracle.com
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reason
To pick the changes in:
9d7dfb95da2cb5c1 ("KVM: VMX: Inject #UD if guest tries to execute SEAMCALL or TDCALL")
The 'perf kvm-stat' tool uses the exit reasons that are included in the
VMX_EXIT_REASONS define, this new SEAMCALL isn't included there (TDCALL
is), so shouldn't be causing any change in behaviour, this patch ends up
being just addressess the following perf build warning:
Warning: Kernel ABI header differences:
diff -u tools/arch/x86/include/uapi/asm/vmx.h arch/x86/include/uapi/asm/vmx.h
Please see tools/include/uapi/README for further details.
Cc: Sean Christopherson <seanjc@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Quotation marks in cpufeatures.h comments are special and when the
comment begins with a quoted string, that string lands in /proc/cpuinfo,
turning it into a user-visible one.
The LKGS comment doesn't begin with a quoted string but just in case
drop the quoted "kernel" in there to avoid confusion. And while at it,
simply change the description into what the LKGS instruction does for
more clarity.
No functional changes.
Reviewed-by: Xin Li (Intel) <xin@zytor.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20251015103548.10194-1-bp@kernel.org
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handle new exit reasons
To pick the changes in:
885df2d2109a60f8 ("KVM: x86: Add support for RDMSR/WRMSRNS w/ immediate on Intel")
c42856af8f70d983 ("KVM: TDX: Add a place holder for handler of TDX hypercalls (TDG.VP.VMCALL)")
That makes 'perf kvm-stat' aware of these new TDCALL and
MSR_{READ,WRITE}_IMM exit reasons, thus addressing the following perf
build warning:
Warning: Kernel ABI header differences:
diff -u tools/arch/x86/include/uapi/asm/vmx.h arch/x86/include/uapi/asm/vmx.h
Please see tools/include/uapi/README for further details.
Cc: Sean Christopherson <seanjc@google.com>
Cc: Xin Li <xin@zytor.com>
Cc: Isaku Yamahata <isaku.yamahata@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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To pick the changes in:
b8c3c9f5d0505905 ("x86/apic: Initialize Secure AVIC APIC backing page")
That triggers:
CC /tmp/build/perf-tools/arch/x86/util/kvm-stat.o
LD /tmp/build/perf-tools/arch/x86/util/perf-util-in.o
LD /tmp/build/perf-tools/arch/x86/perf-util-in.o
LD /tmp/build/perf-tools/arch/perf-util-in.o
LD /tmp/build/perf-tools/perf-util-in.o
AR /tmp/build/perf-tools/libperf-util.a
LINK /tmp/build/perf-tools/perf
But this time causes no changes in tooling results, as the introduced
SVM_VMGEXIT_SAVIC exit reason wasn't added to SVM_EXIT_REASONS, that is
used in kvm-stat.c.
And addresses this perf build warning:
Warning: Kernel ABI header differences:
diff -u tools/arch/x86/include/uapi/asm/svm.h arch/x86/include/uapi/asm/svm.h
Please see tools/include/uapi/README for further details.
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Neeraj Upadhyay <Neeraj.Upadhyay@amd.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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To pick the changes in:
fddd07626baa419c ("KVM: x86: Define AMD's #HV, #VC, and #SX exception vectors")
f2f5519aa4e3ec4e ("KVM: x86: Define Control Protection Exception (#CP) vector")
9d6812d415358372 ("KVM: x86: Enable guest SSP read/write interface with new uAPIs")
06f2969c6a1237f0 ("KVM: x86: Introduce KVM_{G,S}ET_ONE_REG uAPIs support")
That just rebuilds kvm-stat.c on x86, no change in functionality.
This silences these perf build warning:
Warning: Kernel ABI header differences:
diff -u tools/arch/x86/include/uapi/asm/kvm.h arch/x86/include/uapi/asm/kvm.h
Please see tools/include/uapi/README for further details.
Cc: Sean Christopherson <seanjc@google.com>
Cc: Yang Weijiang <weijiang.yang@intel.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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To pick the changes from:
e19c06219985f2be ("x86/cpufeatures: Add support for Assignable Bandwidth Monitoring Counters (ABMC)")
7b59c73fd611eae8 ("x86/cpufeatures: Add SNP Secure TSC")
3c7cb84145336721 ("x86/cpufeatures: Add a CPU feature bit for MSR immediate form instructions")
2f8f173413f1cbf5 ("x86/vmscape: Add conditional IBPB mitigation")
a508cec6e5215a3f ("x86/vmscape: Enumerate VMSCAPE bug")
This causes these perf files to be rebuilt and brings some X86_FEATURE
that may be used by:
CC /tmp/build/perf/bench/mem-memcpy-x86-64-asm.o
CC /tmp/build/perf/bench/mem-memset-x86-64-asm.o
And addresses this perf build warning:
Warning: Kernel ABI header differences:
diff -u tools/arch/x86/include/asm/cpufeatures.h arch/x86/include/asm/cpufeatures.h
Please see tools/include/uapi/README for further details.
Cc: Babu Moger <babu.moger@amd.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Nikunj A Dadhania <nikunj@amd.com>
Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Xin Li <xin@zytor.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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AMD64_{PERF_CNTR_GLOBAL_STATUS_SET,SAVIC_CONTROL}, IA32_L3_QOS_{ABMC,EXT}_CFG
To pick up the changes in:
cdfed9370b96aaba ("KVM: x86/pmu: Move PMU_CAP_{FW_WRITES,LBR_FMT} into msr-index.h header")
bc6397cf0bc4f2b7 ("x86/cpu/topology: Define AMD64_CPUID_EXT_FEAT MSR")
84ecefb766748916 ("x86/resctrl: Add data structures and definitions for ABMC assignment")
faebbc58cde9d8f6 ("x86/resctrl: Add support to enable/disable AMD ABMC feature")
c4074ab87f3483de ("x86/apic: Enable Secure AVIC in the control MSR")
869e36b9660dd72a ("x86/apic: Allow NMI to be injected from hypervisor for Secure AVIC")
30c2b98aa84c76f2 ("x86/apic: Add new driver for Secure AVIC")
0c5caea762de31a8 ("perf/x86: Add PERF_CAP_PEBS_TIMING_INFO flag")
68e61f6fd65610e7 ("KVM: SVM: Emulate PERF_CNTR_GLOBAL_STATUS_SET for PerfMonV2")
a3c4f3396b82849a ("x86/msr-index: Add AMD workload classification MSRs")
65f55a30176662ee ("x86/CPU/AMD: Add CPUID faulting support")
17ec2f965344ee3f ("KVM: VMX: Allow guest to set DEBUGCTL.RTM_DEBUG if RTM is supported")
Addressing this tools/perf build warning:
Warning: Kernel ABI header differences:
diff -u tools/arch/x86/include/asm/msr-index.h arch/x86/include/asm/msr-index.h
That makes the beautification scripts to pick some new entries:
$ tools/perf/trace/beauty/tracepoints/x86_msr.sh > before
$ cp arch/x86/include/asm/msr-index.h tools/arch/x86/include/asm/msr-index.h
$ tools/perf/trace/beauty/tracepoints/x86_msr.sh > after
$ diff -u before after
--- before 2025-10-30 09:34:49.283533597 -0300
+++ after 2025-10-30 09:35:00.971426811 -0300
@@ -272,6 +272,9 @@
[0xc0000300 - x86_64_specific_MSRs_offset] = "AMD64_PERF_CNTR_GLOBAL_STATUS",
[0xc0000301 - x86_64_specific_MSRs_offset] = "AMD64_PERF_CNTR_GLOBAL_CTL",
[0xc0000302 - x86_64_specific_MSRs_offset] = "AMD64_PERF_CNTR_GLOBAL_STATUS_CLR",
+ [0xc0000303 - x86_64_specific_MSRs_offset] = "AMD64_PERF_CNTR_GLOBAL_STATUS_SET",
+ [0xc00003fd - x86_64_specific_MSRs_offset] = "IA32_L3_QOS_ABMC_CFG",
+ [0xc00003ff - x86_64_specific_MSRs_offset] = "IA32_L3_QOS_EXT_CFG",
[0xc0000400 - x86_64_specific_MSRs_offset] = "IA32_EVT_CFG_BASE",
[0xc0000500 - x86_64_specific_MSRs_offset] = "AMD_WORKLOAD_CLASS_CONFIG",
[0xc0000501 - x86_64_specific_MSRs_offset] = "AMD_WORKLOAD_CLASS_ID",
@@ -319,6 +322,7 @@
[0xc0010133 - x86_AMD_V_KVM_MSRs_offset] = "AMD64_RMP_END",
[0xc0010134 - x86_AMD_V_KVM_MSRs_offset] = "AMD64_GUEST_TSC_FREQ",
[0xc0010136 - x86_AMD_V_KVM_MSRs_offset] = "AMD64_RMP_CFG",
+ [0xc0010138 - x86_AMD_V_KVM_MSRs_offset] = "AMD64_SAVIC_CONTROL",
[0xc0010140 - x86_AMD_V_KVM_MSRs_offset] = "AMD64_OSVW_ID_LENGTH",
[0xc0010141 - x86_AMD_V_KVM_MSRs_offset] = "AMD64_OSVW_STATUS",
[0xc0010200 - x86_AMD_V_KVM_MSRs_offset] = "F15H_PERF_CTL",
$
Now one can trace systemwide asking to see backtraces to where that MSR
is being read/written:
root@x1:~# perf trace -e msr:*_msr/max-stack=32/ --filter="msr==IA32_L3_QOS_ABMC_CFG"
^Croot@x1:~#
If we use -v (verbose mode) we can see what it does behind the scenes:
root@x1:~# perf trace -v -e msr:*_msr/max-stack=32/ --filter="msr==IA32_L3_QOS_ABMC_CFG"
0xc00003fd
New filter for msr:write_msr: (msr==0xc00003fd) && (common_pid != 449842 && common_pid != 433756)
0xc00003fd
New filter for msr:read_msr: (msr==0xc00003fd) && (common_pid != 449842 && common_pid != 433756)
mmap size 528384B
^Croot@x1:~#
Example with a frequent msr:
# perf trace -v -e msr:*_msr/max-stack=32/ --filter="msr==IA32_SPEC_CTRL" --max-events 2
Using CPUID AuthenticAMD-25-21-0
0x48
New filter for msr:read_msr: (msr==0x48) && (common_pid != 2612129 && common_pid != 3841)
0x48
New filter for msr:write_msr: (msr==0x48) && (common_pid != 2612129 && common_pid != 3841)
mmap size 528384B
Looking at the vmlinux_path (8 entries long)
symsrc__init: build id mismatch for vmlinux.
Using /proc/kcore for kernel data
Using /proc/kallsyms for symbols
0.000 Timer/2525383 msr:write_msr(msr: IA32_SPEC_CTRL, val: 6)
do_trace_write_msr ([kernel.kallsyms])
do_trace_write_msr ([kernel.kallsyms])
__switch_to_xtra ([kernel.kallsyms])
__switch_to ([kernel.kallsyms])
__schedule ([kernel.kallsyms])
schedule ([kernel.kallsyms])
futex_wait_queue_me ([kernel.kallsyms])
futex_wait ([kernel.kallsyms])
do_futex ([kernel.kallsyms])
__x64_sys_futex ([kernel.kallsyms])
do_syscall_64 ([kernel.kallsyms])
entry_SYSCALL_64_after_hwframe ([kernel.kallsyms])
__futex_abstimed_wait_common64 (/usr/lib64/libpthread-2.33.so)
0.030 :0/0 msr:write_msr(msr: IA32_SPEC_CTRL, val: 2)
do_trace_write_msr ([kernel.kallsyms])
do_trace_write_msr ([kernel.kallsyms])
__switch_to_xtra ([kernel.kallsyms])
__switch_to ([kernel.kallsyms])
__schedule ([kernel.kallsyms])
schedule_idle ([kernel.kallsyms])
do_idle ([kernel.kallsyms])
cpu_startup_entry ([kernel.kallsyms])
secondary_startup_64_no_verify ([kernel.kallsyms])
#
Please see tools/include/uapi/README for further details.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Babu Moger <babu.moger@amd.com>
Cc: Dapeng Mi <dapeng1.mi@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Neeraj Upadhyay <Neeraj.Upadhyay@amd.com>
Cc: Perry Yuan <perry.yuan@amd.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sean Christopherson <seanjc@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Use the new-found freedom of allowing variable declarions inside
for() to simplify the for_each_insn_prefix() iterator to no longer
need an external temporary.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
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That cpuinfo_x86.x86_capability[] element was supposed to mirror CPUID flags
from CPUID_0x80000007_EBX but that leaf has still to this day only three bits
defined in it. So move those bits to scattered.c and free the capability
element for synthetic flags.
No functional changes.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 cleanups from Borislav Petkov:
- Simplify inline asm flag output operands now that the minimum
compiler version supports the =@ccCOND syntax
- Remove a bunch of AS_* Kconfig symbols which detect assembler support
for various instruction mnemonics now that the minimum assembler
version supports them all
- The usual cleanups all over the place
* tag 'x86_cleanups_for_v6.18_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/asm: Remove code depending on __GCC_ASM_FLAG_OUTPUTS__
x86/sgx: Use ENCLS mnemonic in <kernel/cpu/sgx/encls.h>
x86/mtrr: Remove license boilerplate text with bad FSF address
x86/asm: Use RDPKRU and WRPKRU mnemonics in <asm/special_insns.h>
x86/idle: Use MONITORX and MWAITX mnemonics in <asm/mwait.h>
x86/entry/fred: Push __KERNEL_CS directly
x86/kconfig: Remove CONFIG_AS_AVX512
crypto: x86 - Remove CONFIG_AS_VPCLMULQDQ
crypto: X86 - Remove CONFIG_AS_VAES
crypto: x86 - Remove CONFIG_AS_GFNI
x86/kconfig: Drop unused and needless config X86_64_SMP
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git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools
Pull perf tools updates from Arnaldo Carvalho de Melo:
- Extended 'perf annotate' with DWARF type information
(--code-with-type) integration in the TUI, including a 'T'
hotkey to toggle it
- Enhanced 'perf bench mem' with new mmap() workloads and control
over page/chunk sizes
- Fix 'perf stat' error handling to correctly display unsupported
events
- Improved support for Clang cross-compilation
- Refactored LLVM and Capstone disasm for modularity
- Introduced the :X modifier to exclude an event from automatic
regrouping
- Adjusted KVM sampling defaults to use the "cycles" event to prevent
failures
- Added comprehensive support for decoding PowerPC Dispatch Trace Log
(DTL)
- Updated Arm SPE tracing logic for better analysis of memory and snoop
details
- Synchronized Intel PMU events and metrics with TMA 5.1 across
multiple processor generations
- Converted dependencies like libperl and libtracefs to be opt-in
- Handle more Rust symbols in kallsyms ('N', debugging)
- Improve the python binding to allow for python based tools to use
more of the libraries, add a 'ilist' utility to test those new
bindings
- Various 'perf test' fixes
- Kan Liang no longer a perf tools reviewer
* tag 'perf-tools-for-v6.18-1-2025-10-08' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools: (192 commits)
perf tools: Fix arm64 libjvmti build by generating unistd_64.h
perf tests: Don't retest sections in "Object code reading"
perf docs: Document building with Clang
perf build: Support build with clang
perf test coresight: Dismiss clang warning for unroll loop thread
perf test coresight: Dismiss clang warning for thread loop
perf test coresight: Dismiss clang warning for memcpy thread
perf build: Disable thread safety analysis for perl header
perf build: Correct CROSS_ARCH for clang
perf python: split Clang options when invoking Popen
tools build: Align warning options with perf
perf disasm: Remove unused evsel from 'struct annotate_args'
perf srcline: Fallback between addr2line implementations
perf disasm: Make ins__scnprintf() and ins__is_nop() static
perf dso: Clean up read_symbol() error handling
perf dso: Support BPF programs in dso__read_symbol()
perf dso: Move read_symbol() from llvm/capstone to dso
perf llvm: Reduce LLVM initialization
perf check: Add libLLVM feature
perf parse-events: Fix parsing of >30kb event strings
...
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