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
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
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
...
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
...
To pick the changes in:
9d7dfb95da ("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>
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
To pick the changes in:
885df2d210 ("KVM: x86: Add support for RDMSR/WRMSRNS w/ immediate on Intel")
c42856af8f ("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>
To pick the changes in:
b8c3c9f5d0 ("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>
To pick the changes in:
fddd07626b ("KVM: x86: Define AMD's #HV, #VC, and #SX exception vectors")
f2f5519aa4 ("KVM: x86: Define Control Protection Exception (#CP) vector")
9d6812d415 ("KVM: x86: Enable guest SSP read/write interface with new uAPIs")
06f2969c6a ("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>
To pick the changes from:
e19c062199 ("x86/cpufeatures: Add support for Assignable Bandwidth Monitoring Counters (ABMC)")
7b59c73fd6 ("x86/cpufeatures: Add SNP Secure TSC")
3c7cb84145 ("x86/cpufeatures: Add a CPU feature bit for MSR immediate form instructions")
2f8f173413 ("x86/vmscape: Add conditional IBPB mitigation")
a508cec6e5 ("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>
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>
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>
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
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
...
Pull VFIO updates from Alex Williamson:
- Use fdinfo to expose the sysfs path of a device represented by a vfio
device file (Alex Mastro)
- Mark vfio-fsl-mc, vfio-amba, and the reset functions for
vfio-platform for removal as these are either orphaned or believed to
be unused (Alex Williamson)
- Add reviewers for vfio-platform to save it from also being marked for
removal (Mostafa Saleh, Pranjal Shrivastava)
- VFIO selftests, including basic sanity testing and minimal userspace
drivers for testing against real hardware. This is also expected to
provide integration with KVM selftests for KVM-VFIO interfaces (David
Matlack, Josh Hilke)
- Fix drivers/cdx and vfio/cdx to build without CONFIG_GENERIC_MSI_IRQ
(Nipun Gupta)
- Fix reference leak in hisi_acc (Miaoqian Lin)
- Use consistent return for unsupported device feature (Alex Mastro)
- Unwind using the correct memory free callback in vfio/pds (Zilin
Guan)
- Use IRQ_DISABLE_LAZY flag to improve handling of pre-PCI2.3 INTx and
resolve stalled interrupt on ppc64 (Timothy Pearson)
- Enable GB300 in nvgrace-gpu vfio-pci variant driver (Tushar Dave)
- Misc:
- Drop unnecessary ternary conversion in vfio/pci (Xichao Zhao)
- Grammatical fix in nvgrace-gpu (Morduan Zang)
- Update Shameer's email address (Shameer Kolothum)
- Fix document build warning (Alex Williamson)
* tag 'vfio-v6.18-rc1' of https://github.com/awilliam/linux-vfio: (48 commits)
vfio/nvgrace-gpu: Add GB300 SKU to the devid table
vfio/pci: Fix INTx handling on legacy non-PCI 2.3 devices
vfio/pds: replace bitmap_free with vfree
vfio: return -ENOTTY for unsupported device feature
hisi_acc_vfio_pci: Fix reference leak in hisi_acc_vfio_debug_init
vfio/platform: Mark reset drivers for removal
vfio/amba: Mark for removal
MAINTAINERS: Add myself as VFIO-platform reviewer
MAINTAINERS: Add myself as VFIO-platform reviewer
docs: proc.rst: Fix VFIO Device title formatting
vfio: selftests: Fix .gitignore for already tracked files
vfio/cdx: update driver to build without CONFIG_GENERIC_MSI_IRQ
cdx: don't select CONFIG_GENERIC_MSI_IRQ
MAINTAINERS: Update Shameer Kolothum's email address
vfio: selftests: Add a script to help with running VFIO selftests
vfio: selftests: Make iommufd the default iommu_mode
vfio: selftests: Add iommufd mode
vfio: selftests: Add iommufd_compat_type1{,v2} modes
vfio: selftests: Add vfio_type1v2_mode
vfio: selftests: Replicate tests across all iommu_modes
...
Pull x86 instruction decoder update from Borislav Petkov:
- Add instruction decoding support for the XOP-prefixed instruction set
present on the AMD Bulldozer uarch
[ These instructions don't normally happen, but a X86_NATIVE_CPU build
on a bulldozer host can make the compiler then use these unusual
instruction encodings ]
* tag 'x86_misc_for_v6.18_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/insn: Add XOP prefix instructions decoder support
Pull performance events updates from Ingo Molnar:
"Core perf code updates:
- Convert mmap() related reference counts to refcount_t. This is in
reaction to the recently fixed refcount bugs, which could have been
detected earlier and could have mitigated the bug somewhat (Thomas
Gleixner, Peter Zijlstra)
- Clean up and simplify the callchain code, in preparation for
sframes (Steven Rostedt, Josh Poimboeuf)
Uprobes updates:
- Add support to optimize usdt probes on x86-64, which gives a
substantial speedup (Jiri Olsa)
- Cleanups and fixes on x86 (Peter Zijlstra)
PMU driver updates:
- Various optimizations and fixes to the Intel PMU driver (Dapeng Mi)
Misc cleanups and fixes:
- Remove redundant __GFP_NOWARN (Qianfeng Rong)"
* tag 'perf-core-2025-09-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (57 commits)
selftests/bpf: Fix uprobe_sigill test for uprobe syscall error value
uprobes/x86: Return error from uprobe syscall when not called from trampoline
perf: Skip user unwind if the task is a kernel thread
perf: Simplify get_perf_callchain() user logic
perf: Use current->flags & PF_KTHREAD|PF_USER_WORKER instead of current->mm == NULL
perf: Have get_perf_callchain() return NULL if crosstask and user are set
perf: Remove get_perf_callchain() init_nr argument
perf/x86: Print PMU counters bitmap in x86_pmu_show_pmu_cap()
perf/x86/intel: Add ICL_FIXED_0_ADAPTIVE bit into INTEL_FIXED_BITS_MASK
perf/x86/intel: Change macro GLOBAL_CTRL_EN_PERF_METRICS to BIT_ULL(48)
perf/x86: Add PERF_CAP_PEBS_TIMING_INFO flag
perf/x86/intel: Fix IA32_PMC_x_CFG_B MSRs access error
perf/x86/intel: Use early_initcall() to hook bts_init()
uprobes: Remove redundant __GFP_NOWARN
selftests/seccomp: validate uprobe syscall passes through seccomp
seccomp: passthrough uprobe systemcall without filtering
selftests/bpf: Fix uprobe syscall shadow stack test
selftests/bpf: Change test_uretprobe_regs_change for uprobe and uretprobe
selftests/bpf: Add uprobe_regs_equal test
selftests/bpf: Add optimized usdt variant for basic usdt test
...
The minimum supported GCC version is 8.1, which supports flag output operands
and always defines __GCC_ASM_FLAG_OUTPUTS__ macro.
Remove code depending on __GCC_ASM_FLAG_OUTPUTS__ and use the "=@ccCOND" flag
output operand directly.
Use the equivalent "=@ccz" instead of "=@cce" flag output operand for
CMPXCHG8B and CMPXCHG16B instructions. These instructions set a single flag
bit - the Zero flag - and "=@ccz" is used to distinguish the CC user from
comparison instructions, where set ZERO flag indeed means that the values are
equal.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20250905121723.GCaLrU04lP2A50PT-B@fat_crate.local
IA32_PERF_CAPABILITIES.PEBS_TIMING_INFO[bit 17] is introduced to
indicate whether timed PEBS is supported. Timed PEBS adds a new "retired
latency" field in basic info group to show the timing info. Please find
detailed information about timed PEBS in section 8.4.1 "Timed Processor
Event Based Sampling" of "Intel Architecture Instruction Set Extensions
and Future Features".
This patch adds PERF_CAP_PEBS_TIMING_INFO flag and KVM module leverages
this flag to expose timed PEBS feature to guest.
Moreover, opportunistically refine the indents and make the macros
share consistent indents.
Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Tested-by: Yi Lai <yi1.lai@intel.com>
Link: https://lore.kernel.org/r/20250820023032.17128-5-dapeng1.mi@linux.intel.com
To pick up the changes in this cset:
7b306dfa32 x86/sev: Evict cache lines during SNP memory validation
65f55a3017 x86/CPU/AMD: Add CPUID faulting support
d8010d4ba4 x86/bugs: Add a Transient Scheduler Attacks mitigation
a3c4f3396b x86/msr-index: Add AMD workload classification MSRs
17ec2f9653 KVM: VMX: Allow guest to set DEBUGCTL.RTM_DEBUG if RTM is supported
This addresses these 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 for further details.
Cc: x86@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
To pick up the changes in this cset:
f55ce5a6cd KVM: arm64: Expose new KVM cap for cacheable PFNMAP
28224ef02b KVM: TDX: Report supported optional TDVMCALLs in TDX capabilities
4580dbef5c KVM: TDX: Exit to userspace for SetupEventNotifyInterrupt
25e8b1dd48 KVM: TDX: Exit to userspace for GetTdVmCallInfo
cf207eac06 KVM: TDX: Handle TDG.VP.VMCALL<GetQuote>
This addresses these 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 for further details.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
AMD Cyan Skillfish (Family 17h, Model 47h, Stepping 0h) has an error that
causes RDSEED to always return 0xffffffff, while RDRAND works correctly.
Mask the RDSEED cap for this CPU so that both /proc/cpuinfo and direct CPUID
read report RDSEED as unavailable.
[ bp: Move to amd.c, massage. ]
Signed-off-by: Mikhail Paulyshka <me@mixaill.net>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/20250524145319.209075-1-me@mixaill.net
To pick the changes in:
827547bc3a ("KVM: SVM: Add architectural definitions/assets for Bus Lock Threshold")
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
The SVM_EXIT_BUS_LOCK exit reason was added to SVM_EXIT_REASONS, used in
kvm-stat.c.
This 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
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nikunj A Dadhania <nikunj@amd.com>
Cc: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/aErcjuTTCVEZ-8Nb@x1
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Pull perf tools updates from Arnaldo Carvalho de Melo:
"perf report/top/annotate TUI:
- Accept the left arrow key as a Zoom out if done on the first column
- Show if source code toggle status in title, to help spotting bugs
with the various disassemblers (capstone, llvm, objdump)
- Provide feedback on unhandled hotkeys
Build:
- Better inform when certain features are not available with warnings
in the build process and in 'perf version --build-options' or 'perf -vv'
perf record:
- Improve the --off-cpu code by synthesizing events for switch-out ->
switch-in intervals using a BPF program. This can be fine tuned
using a --off-cpu-thresh knob
perf report:
- Add 'tgid' sort key
perf mem/c2c:
- Add 'op', 'cache', 'snoop', 'dtlb' output fields
- Add support for 'ldlat' on AMD IBS (Instruction Based Sampling)
perf ftrace:
- Use process/session specific trace settings instead of messing with
the global ftrace knobs
perf trace:
- Implement syscall summary in BPF
- Support --summary-mode=cgroup
- Always print return value for syscalls returning a pid
- The rseq and set_robust_list don't return a pid, just -errno
perf lock contention:
- Symbolize zone->lock using BTF
- Add -J/--inject-delay option to estimate impact on application
performance by optimization of kernel locking behavior
perf stat:
- Improve hybrid support for the NMI watchdog warning
Symbol resolution:
- Handle 'u' and 'l' symbols in /proc/kallsyms, resolving some Rust
symbols
- Improve Rust demangler
Hardware tracing:
Intel PT:
- Fix PEBS-via-PT data_src
- Do not default to recording all switch events
- Fix pattern matching with python3 on the SQL viewer script
arm64:
- Fixups for the hip08 hha PMU
Vendor events:
- Update Intel events/metrics files for alderlake, alderlaken,
arrowlake, bonnell, broadwell, broadwellde, broadwellx,
cascadelakex, clearwaterforest, elkhartlake, emeraldrapids,
grandridge, graniterapids, haswell, haswellx, icelake, icelakex,
ivybridge, ivytown, jaketown, lunarlake, meteorlake, nehalemep,
nehalemex, rocketlake, sandybridge, sapphirerapids, sierraforest,
skylake, skylakex, snowridgex, tigerlake, westmereep-dp,
westmereep-sp, westmereep-sx
python support:
- Add support for event counts in the python binding, add a
counting.py example
perf list:
- Display the PMU name associated with a perf metric in JSON
perf test:
- Hybrid improvements for metric value validation test
- Fix LBR test by ignoring idle task
- Add AMD IBS sw filter ana d'ldlat' tests
- Add 'perf trace --summary-mode=cgroup' test
- Add tests for the various language symbol demanglers
Miscellaneous:
- Allow specifying the cpu an event will be tied using '-e
event/cpu=N/'
- Sync various headers with the kernel sources
- Add annotations to use clang's -Wthread-safety and fix some
problems it detected
- Make dump_stack() use perf's symbol resolution to provide better
backtraces
- Intel TPEBS support cleanups and fixes. TPEBS stands for Timed PEBS
(Precision Event-Based Sampling), that adds timing info, the
retirement latency of instructions
- Various memory allocation (some detected by ASAN) and reference
counting fixes
- Add a 8-byte aligned PERF_RECORD_COMPRESSED2 to replace
PERF_RECORD_COMPRESSED
- Skip unsupported event types in perf.data files, don't stop when
finding one
- Improve lookups using hashmaps and binary searches"
* tag 'perf-tools-for-v6.16-1-2025-06-03' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools: (206 commits)
perf callchain: Always populate the addr_location map when adding IP
perf lock contention: Reject more than 10ms delays for safety
perf trace: Set errpid to false for rseq and set_robust_list
perf symbol: Move demangling code out of symbol-elf.c
perf trace: Always print return value for syscalls returning a pid
perf script: Print PERF_AUX_FLAG_COLLISION flag
perf mem: Show absolute percent in mem_stat output
perf mem: Display sort order only if it's available
perf mem: Describe overhead calculation in brief
perf record: Fix incorrect --user-regs comments
Revert "perf thread: Ensure comm_lock held for comm_list"
perf test trace_summary: Skip --bpf-summary tests if no libbpf
perf test intel-pt: Skip jitdump test if no libelf
perf intel-tpebs: Avoid race when evlist is being deleted
perf test demangle-java: Don't segv if demangling fails
perf symbol: Fix use-after-free in filename__read_build_id
perf pmu: Avoid segv for missing name/alias_name in wildcarding
perf machine: Factor creating a "live" machine out of dwarf-unwind
perf test: Add AMD IBS sw filter test
perf mem: Count L2 HITM for c2c statistic
...
Pull more kvm updates from Paolo Bonzini:
Generic:
- Clean up locking of all vCPUs for a VM by using the *_nest_lock()
family of functions, and move duplicated code to virt/kvm/. kernel/
patches acked by Peter Zijlstra
- Add MGLRU support to the access tracking perf test
ARM fixes:
- Make the irqbypass hooks resilient to changes in the GSI<->MSI
routing, avoiding behind stale vLPI mappings being left behind. The
fix is to resolve the VGIC IRQ using the host IRQ (which is stable)
and nuking the vLPI mapping upon a routing change
- Close another VGIC race where vCPU creation races with VGIC
creation, leading to in-flight vCPUs entering the kernel w/o
private IRQs allocated
- Fix a build issue triggered by the recently added workaround for
Ampere's AC04_CPU_23 erratum
- Correctly sign-extend the VA when emulating a TLBI instruction
potentially targeting a VNCR mapping
- Avoid dereferencing a NULL pointer in the VGIC debug code, which
can happen if the device doesn't have any mapping yet
s390:
- Fix interaction between some filesystems and Secure Execution
- Some cleanups and refactorings, preparing for an upcoming big
series
x86:
- Wait for target vCPU to ack KVM_REQ_UPDATE_PROTECTED_GUEST_STATE
to fix a race between AP destroy and VMRUN
- Decrypt and dump the VMSA in dump_vmcb() if debugging enabled for
the VM
- Refine and harden handling of spurious faults
- Add support for ALLOWED_SEV_FEATURES
- Add #VMGEXIT to the set of handlers special cased for
CONFIG_RETPOLINE=y
- Treat DEBUGCTL[5:2] as reserved to pave the way for virtualizing
features that utilize those bits
- Don't account temporary allocations in sev_send_update_data()
- Add support for KVM_CAP_X86_BUS_LOCK_EXIT on SVM, via Bus Lock
Threshold
- Unify virtualization of IBRS on nested VM-Exit, and cross-vCPU
IBPB, between SVM and VMX
- Advertise support to userspace for WRMSRNS and PREFETCHI
- Rescan I/O APIC routes after handling EOI that needed to be
intercepted due to the old/previous routing, but not the
new/current routing
- Add a module param to control and enumerate support for device
posted interrupts
- Fix a potential overflow with nested virt on Intel systems running
32-bit kernels
- Flush shadow VMCSes on emergency reboot
- Add support for SNP to the various SEV selftests
- Add a selftest to verify fastops instructions via forced emulation
- Refine and optimize KVM's software processing of the posted
interrupt bitmap, and share the harvesting code between KVM and the
kernel's Posted MSI handler"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (93 commits)
rtmutex_api: provide correct extern functions
KVM: arm64: vgic-debug: Avoid dereferencing NULL ITE pointer
KVM: arm64: vgic-init: Plug vCPU vs. VGIC creation race
KVM: arm64: Unmap vLPIs affected by changes to GSI routing information
KVM: arm64: Resolve vLPI by host IRQ in vgic_v4_unset_forwarding()
KVM: arm64: Protect vLPI translation with vgic_irq::irq_lock
KVM: arm64: Use lock guard in vgic_v4_set_forwarding()
KVM: arm64: Mask out non-VA bits from TLBI VA* on VNCR invalidation
arm64: sysreg: Drag linux/kconfig.h to work around vdso build issue
KVM: s390: Simplify and move pv code
KVM: s390: Refactor and split some gmap helpers
KVM: s390: Remove unneeded srcu lock
s390: Remove unneeded includes
s390/uv: Improve splitting of large folios that cannot be split while dirty
s390/uv: Always return 0 from s390_wiggle_split_folio() if successful
s390/uv: Don't return 0 from make_hva_secure() if the operation was not successful
rust: add helper for mutex_trylock
RISC-V: KVM: use kvm_trylock_all_vcpus when locking all vCPUs
KVM: arm64: use kvm_trylock_all_vcpus when locking all vCPUs
x86: KVM: SVM: use kvm_lock_all_vcpus instead of a custom implementation
...
KVM selftests changes for 6.16:
- Add support for SNP to the various SEV selftests.
- Add a selftest to verify fastops instructions via forced emulation.
- Add MGLRU support to the access tracking perf test.
KVM x86 misc changes for 6.16:
- Unify virtualization of IBRS on nested VM-Exit, and cross-vCPU IBPB, between
SVM and VMX.
- Advertise support to userspace for WRMSRNS and PREFETCHI.
- Rescan I/O APIC routes after handling EOI that needed to be intercepted due
to the old/previous routing, but not the new/current routing.
- Add a module param to control and enumerate support for device posted
interrupts.
- Misc cleanups.
To pick up the changes from these csets:
159013a7ca ("x86/its: Enumerate Indirect Target Selection (ITS) bug")
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,
for instance:
$ tools/perf/trace/beauty/tracepoints/x86_msr.sh | head
static const char * const x86_MSRs[] = {
[0x00000000] = "IA32_P5_MC_ADDR",
[0x00000001] = "IA32_P5_MC_TYPE",
[0x00000010] = "IA32_TSC",
[0x00000017] = "IA32_PLATFORM_ID",
[0x0000001b] = "IA32_APICBASE",
[0x00000020] = "KNC_PERFCTR0",
[0x00000021] = "KNC_PERFCTR1",
[0x00000028] = "KNC_EVNTSEL0",
[0x00000029] = "KNC_EVNTSEL1",
$
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
Please see tools/include/uapi/README for further details.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Link: https://lore.kernel.org/r/20250519214126.1652491-3-acme@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
In commit 2e044911be ("x86/traps: Decode 0xEA instructions as #UD")
FineIBT starts using 0xEA as an invalid instruction like UD2. But
insn decoder always returns the length of "0xea" instruction as 7
because it does not check the (i64) superscript.
The x86 instruction decoder should also decode 0xEA on x86-64 as
a one-byte invalid instruction by decoding the "(i64)" superscript tag.
This stops decoding instruction which has (i64) but does not have (o64)
superscript in 64-bit mode at opcode and skips other fields.
With this change, insn_decoder_test says 0xea is 1 byte length if
x86-64 (-y option means 64-bit):
$ printf "0:\tea\t\n" | insn_decoder_test -y -v
insn_decoder_test: success: Decoded and checked 1 instructions
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/174580490000.388420.5225447607417115496.stgit@devnote2
Commit:
159039af8c ("x86/insn: x86/insn: Add support for REX2 prefix to the instruction decoder opcode map")
added (!REX2) superscript with a space, but the correct format requires ','
for concatination with other superscript tags.
Add ',' to generate correct insn attribute tables.
I confirmed with following command:
arch/x86/lib/x86-opcode-map.txt | grep e8 | head -n 1
[0xe8] = INAT_MAKE_IMM(INAT_IMM_VWORD32) | INAT_FORCE64 | INAT_NO_REX2,
Fixes: 159039af8c ("x86/insn: x86/insn: Add support for REX2 prefix to the instruction decoder opcode map")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/174580489027.388420.15539375184727726142.stgit@devnote2
Per the APM [1]:
Some processors, identified by CPUID Fn8000_0008_EBX[IbrsSameMode]
(bit 19) = 1, provide additional speculation limits. For these
processors, when IBRS is set, indirect branch predictions are not
influenced by any prior indirect branches, regardless of mode (CPL
and guest/host) and regardless of whether the prior indirect branches
occurred before or after the setting of IBRS. This is referred to as
Same Mode IBRS.
Define this feature bit, which will be used by KVM to determine if an
IBPB is required on nested VM-exits in SVM.
[1] AMD64 Architecture Programmer's Manual Pub. 40332, Rev 4.08 - April
2024, Volume 2, 3.2.9 Speculation Control MSRs
Signed-off-by: Yosry Ahmed <yosry.ahmed@linux.dev>
Reviewed-by: Jim Mattson <jmattson@google.com>
Link: https://lore.kernel.org/r/20250221163352.3818347-2-yosry.ahmed@linux.dev
Signed-off-by: Sean Christopherson <seanjc@google.com>
