Changes in Build

fdf08e4b5a33e840b6c2a988cd4392b4443ca51b - perf unwind-libunwind: Make libunwind register reading cross platform

Thu, 14 May 2026 01:31:48 +0200

perf unwind-libunwind: Make libunwind register reading cross platformMove the libunwind register to perf register mapping functions inarch/../util/unwind-libunwind.c into a new libunwind-archdirectory. Rename the functions to__get_perf_regnum_for_unw_regnum_. Add untested ppc32 and s390functions. Add a get_perf_regnum_for_unw_regnum function that takes anELF machine as well as a register number and chooses the appropriatearchitecture implementation.Split the x86 and powerpc 32 and 64-bit implementations apart so thata single libunwind-.h header is included.Move the e_machine into the unwind_info struct to make it easier topass.Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Albert Ou Cc: Alexander Shishkin Cc: Alexandre Ghiti Cc: Andrew Jones Cc: Athira Rajeev Cc: Dapeng Mi Cc: Dmitrii Dolgov <9erthalion6@gmail.com>Cc: Florian Fainelli Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Li Guan Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Shimin Guo Cc: Thomas Richter Cc: Tomas Glozar Cc: Will Deacon [ Map UNW_PPC32_NIP to PERF_REG_POWERPC_NIP like done for 64-bit, pointed out by a local sashiko ]Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/loongarch/util/Build

841dbf4871c57ce2da18c4ea7ffac5487d0eda16 - perf loongarch: Fix build failure with CONFIG_LIBDW_DWARF_UNWIND

Tue, 14 Apr 2026 02:51:52 +0200

perf loongarch: Fix build failure with CONFIG_LIBDW_DWARF_UNWINDBuilding perf for LoongArch fails when CONFIG_LIBDW_DWARF_UNWIND isenabled because unwind-libdw.o is still referenced inarch/loongarch/util/Build.Fixes: e62fae9d9e8 ("perf unwind-libdw: Fix a cross-arch unwinding bug")Signed-off-by: WANG Rui Acked-by: Huacai Chen Signed-off-by: Namhyung Kim List of files: /linux/tools/perf/arch/loongarch/util/Build

16dccbb84203196dab2e578b27c3c8f549ebff66 - perf regs: Remove weak attributive archxxx_reg_mask() functions

Tue, 03 Feb 2026 03:43:55 +0100

perf regs: Remove __weak attributive arch__xxx_reg_mask() functionsCurrently, some architecture-specific perf-regs functions, such asarch__intr_reg_mask() and arch__user_reg_mask(), are defined with the__weak attribute.This approach ensures that only functions matching the architecture ofthe build/run host are compiled and executed, reducing build time andbinary size.However, this __weak attribute restricts these functions to be calledonly on the same architecture, preventing cross-architecturefunctionality.For example, a perf.data file captured on x86 cannot be parsed on an ARMplatform.To address this limitation, this patch removes the __weak attribute fromthese perf-regs functions.The architecture-specific code is moved from the arch/ directory to theutil/perf-regs-arch/ directory.The appropriate architectural functions are then called based on theEM_HOST.No functional changes are intended.Suggested-by: Ian Rogers Reviewed-by: Ian Rogers Signed-off-by: Dapeng Mi Cc: Adrian Hunter Cc: Albert Ou Cc: Alexander Shishkin Cc: Alexandre Ghiti Cc: Guo Ren Cc: Ingo Molnar Cc: James Clark Cc: John Garry Cc: Mike Leach Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Thomas Falcon Cc: Will Deacon Cc: Xudong Hao Cc: Zide Chen [ Fixed up somme fuzz with s390 and riscv Build files wrt removing perf_regs.o ]Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/loongarch/util/Build

ceea279f93760767c0e654341829334a1c881a08 - perf kvm stat: Remove use of the arch directory

Tue, 03 Feb 2026 19:26:36 +0100

perf kvm stat: Remove use of the arch directory`perf kvm stat` supports record and report options.By using the arch directory a report for a different machine type cannotbe supported.Move the kvm-stat code out of the arch directory and intoutil/kvm-stat-arch following the pattern of perf-regs and dwarf-regs.Avoid duplicate symbols by renaming functions to have the architecturename within them.For global variables, wrap them in an architecture specific function.Selecting the architecture to use with `perf kvm stat` is selected byEM_HOST, ie no different than before the change.Later the ELF machine can be determined from the session or a headerfeature (ie EM_HOST at the time of the record).The build and #define HAVE_KVM_STAT_SUPPORT is now redundant so removeacross Makefiles and in the build.Opportunistically constify architectural structs and arrays.Signed-off-by: Ian Rogers Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexander Shishkin Cc: Alexandre Ghiti Cc: Andi Kleen Cc: Andrew Jones Cc: Anubhav Shelat Cc: Anup Patel Cc: Athira Rajeev Cc: Blake Jones Cc: Chun-Tse Shao Cc: Dapeng Mi Cc: Dmitriy Vyukov Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Quan Zhou Cc: Shimin Guo Cc: Swapnil Sapkal Cc: Thomas Falcon Cc: Will Deacon Cc: Yunseong Kim Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/loongarch/util/Build

1d37bd8366d8cc99d8dbb1d39b285db8b429ec69 - perf loongarch: Remove dwarf-regs.c

Sat, 09 Nov 2024 00:45:56 +0100

perf loongarch: Remove dwarf-regs.cThe file just provides the function get_arch_regstr, however, if inthe only caller get_dwarf_regstr EM_HOST is used for the EM_NONE casethe function can never be called. So remove as dead code. Tidy up theEM_NONE cases for loongarch in dwarf-regs.c.Reviewed-by: Masami Hiramatsu (Google) Signed-off-by: Ian Rogers Cc: Anup Patel Cc: Yang Jihong Cc: Palmer Dabbelt Cc: David S. Miller Cc: Albert Ou Cc: Shenlin Liang Cc: Nick Terrell Cc: Guilherme Amadio Cc: Steinar H. Gunderson Cc: Changbin Du Cc: Alexander Lobakin Cc: Przemek Kitszel Cc: Huacai Chen Cc: Guo Ren Cc: Masahiro Yamada Cc: Will Deacon Cc: James Clark Cc: Mike Leach Cc: Chen Pei Cc: Leo Yan Cc: Oliver Upton Cc: Aditya Gupta Cc: Kajol Jain Cc: Athira Rajeev Cc: linux-arm-kernel@lists.infradead.orgCc: linux-riscv@lists.infradead.orgCc: Bibo Mao Cc: John Garry Cc: Atish Patra Cc: Dima Kogan Cc: Paul Walmsley Cc: Dr. David Alan Gilbert Cc: linux-csky@vger.kernel.orgLink: https://lore.kernel.org/r/20241108234606.429459-12-irogers@google.comSigned-off-by: Namhyung Kim List of files: /linux/tools/perf/arch/loongarch/util/Build

5455d89bf3da85176606ff861f4178f6bea648ba - perf build: Rename CONFIG_DWARF to CONFIG_LIBDW

Thu, 17 Oct 2024 02:13:54 +0200

perf build: Rename CONFIG_DWARF to CONFIG_LIBDWIn Makefile.config for unwinding the name dwarf implies eitherlibunwind or libdw. Make it clearer that CONFIG_DWARF is really justdefined when libdw is present by renaming to CONFIG_LIBDW.Signed-off-by: Ian Rogers Acked-by: Namhyung Kim Tested-by: Leo Yan Cc: Anup Patel Cc: Yang Jihong Cc: Palmer Dabbelt Cc: David S. Miller Cc: Albert Ou Cc: Shenlin Liang Cc: Nick Terrell Cc: Guilherme Amadio Cc: Steinar H. Gunderson Cc: Changbin Du Cc: Alexander Lobakin Cc: Przemek Kitszel Cc: Huacai Chen Cc: Guo Ren Cc: Masahiro Yamada Cc: Masami Hiramatsu (Google) Cc: Will Deacon Cc: James Clark Cc: Mike Leach Cc: Chen Pei Cc: Leo Yan Cc: Oliver Upton Cc: Aditya Gupta Cc: Kajol Jain Cc: Athira Rajeev Cc: linux-arm-kernel@lists.infradead.orgCc: linux-riscv@lists.infradead.orgCc: Bibo Mao Cc: John Garry Cc: Atish Patra Cc: Dima Kogan Cc: Paul Walmsley Cc: Dr. David Alan Gilbert Cc: linux-csky@vger.kernel.orgLink: https://lore.kernel.org/r/20241017001354.56973-12-irogers@google.comSigned-off-by: Namhyung Kim List of files: /linux/tools/perf/arch/loongarch/util/Build

2c9b3512402ed192d1f43f4531fb5da947e72bd0 - Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Sat, 20 Jul 2024 21:41:03 +0200

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvmPull kvm updates from Paolo Bonzini: "ARM: - Initial infrastructure for shadow stage-2 MMUs, as part of nested virtualization enablement - Support for userspace changes to the guest CTR_EL0 value, enabling (in part) migration of VMs between heterogenous hardware - Fixes + improvements to pKVM's FF-A proxy, adding support for v1.1 of the protocol - FPSIMD/SVE support for nested, including merged trap configuration and exception routing - New command-line parameter to control the WFx trap behavior under KVM - Introduce kCFI hardening in the EL2 hypervisor - Fixes + cleanups for handling presence/absence of FEAT_TCRX - Miscellaneous fixes + documentation updates LoongArch: - Add paravirt steal time support - Add support for KVM_DIRTY_LOG_INITIALLY_SET - Add perf kvm-stat support for loongarch RISC-V: - Redirect AMO load/store access fault traps to guest - perf kvm stat support - Use guest files for IMSIC virtualization, when available s390: - Assortment of tiny fixes which are not time critical x86: - Fixes for Xen emulation - Add a global struct to consolidate tracking of host values, e.g. EFER - Add KVM_CAP_X86_APIC_BUS_CYCLES_NS to allow configuring the effective APIC bus frequency, because TDX - Print the name of the APICv/AVIC inhibits in the relevant tracepoint - Clean up KVM's handling of vendor specific emulation to consistently act on "compatible with Intel/AMD", versus checking for a specific vendor - Drop MTRR virtualization, and instead always honor guest PAT on CPUs that support self-snoop - Update to the newfangled Intel CPU FMS infrastructure - Don't advertise IA32_PERF_GLOBAL_OVF_CTRL as an MSR-to-be-saved, as it reads '0' and writes from userspace are ignored - Misc cleanups x86 - MMU: - Small cleanups, renames and refactoring extracted from the upcoming Intel TDX support - Don't allocate kvm_mmu_page.shadowed_translation for shadow pages that can't hold leafs SPTEs - Unconditionally drop mmu_lock when allocating TDP MMU page tables for eager page splitting, to avoid stalling vCPUs when splitting huge pages - Bug the VM instead of simply warning if KVM tries to split a SPTE that is non-present or not-huge. KVM is guaranteed to end up in a broken state because the callers fully expect a valid SPTE, it's all but dangerous to let more MMU changes happen afterwards x86 - AMD: - Make per-CPU save_area allocations NUMA-aware - Force sev_es_host_save_area() to be inlined to avoid calling into an instrumentable function from noinstr code - Base support for running SEV-SNP guests. API-wise, this includes a new KVM_X86_SNP_VM type, encrypting/measure the initial image into guest memory, and finalizing it before launching it. Internally, there are some gmem/mmu hooks needed to prepare gmem-allocated pages before mapping them into guest private memory ranges This includes basic support for attestation guest requests, enough to say that KVM supports the GHCB 2.0 specification There is no support yet for loading into the firmware those signing keys to be used for attestation requests, and therefore no need yet for the host to provide certificate data for those keys. To support fetching certificate data from userspace, a new KVM exit type will be needed to handle fetching the certificate from userspace. An attempt to define a new KVM_EXIT_COCO / KVM_EXIT_COCO_REQ_CERTS exit type to handle this was introduced in v1 of this patchset, but is still being discussed by community, so for now this patchset only implements a stub version of SNP Extended Guest Requests that does not provide certificate data x86 - Intel: - Remove an unnecessary EPT TLB flush when enabling hardware - Fix a series of bugs that cause KVM to fail to detect nested pending posted interrupts as valid wake eents for a vCPU executing HLT in L2 (with HLT-exiting disable by L1) - KVM: x86: Suppress MMIO that is triggered during task switch emulation Explicitly suppress userspace emulated MMIO exits that are triggered when emulating a task switch as KVM doesn't support userspace MMIO during complex (multi-step) emulation Silently ignoring the exit request can result in the WARN_ON_ONCE(vcpu->mmio_needed) firing if KVM exits to userspace for some other reason prior to purging mmio_needed See commit 0dc902267cb3 ("KVM: x86: Suppress pending MMIO write exits if emulator detects exception") for more details on KVM's limitations with respect to emulated MMIO during complex emulator flows Generic: - Rename the AS_UNMOVABLE flag that was introduced for KVM to AS_INACCESSIBLE, because the special casing needed by these pages is not due to just unmovability (and in fact they are only unmovable because the CPU cannot access them) - New ioctl to populate the KVM page tables in advance, which is useful to mitigate KVM page faults during guest boot or after live migration. The code will also be used by TDX, but (probably) not through the ioctl - Enable halt poll shrinking by default, as Intel found it to be a clear win - Setup empty IRQ routing when creating a VM to avoid having to synchronize SRCU when creating a split IRQCHIP on x86 - Rework the sched_in/out() paths to replace kvm_arch_sched_in() with a flag that arch code can use for hooking both sched_in() and sched_out() - Take the vCPU @id as an "unsigned long" instead of "u32" to avoid truncating a bogus value from userspace, e.g. to help userspace detect bugs - Mark a vCPU as preempted if and only if it's scheduled out while in the KVM_RUN loop, e.g. to avoid marking it preempted and thus writing guest memory when retrieving guest state during live migration blackout Selftests: - Remove dead code in the memslot modification stress test - Treat "branch instructions retired" as supported on all AMD Family 17h+ CPUs - Print the guest pseudo-RNG seed only when it changes, to avoid spamming the log for tests that create lots of VMs - Make the PMU counters test less flaky when counting LLC cache misses by doing CLFLUSH{OPT} in every loop iteration"* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (227 commits) crypto: ccp: Add the SNP_VLEK_LOAD command KVM: x86/pmu: Add kvm_pmu_call() to simplify static calls of kvm_pmu_ops KVM: x86: Introduce kvm_x86_call() to simplify static calls of kvm_x86_ops KVM: x86: Replace static_call_cond() with static_call() KVM: SEV: Provide support for SNP_EXTENDED_GUEST_REQUEST NAE event x86/sev: Move sev_guest.h into common SEV header KVM: SEV: Provide support for SNP_GUEST_REQUEST NAE event KVM: x86: Suppress MMIO that is triggered during task switch emulation KVM: x86/mmu: Clean up make_huge_page_split_spte() definition and intro KVM: x86/mmu: Bug the VM if KVM tries to split a !hugepage SPTE KVM: selftests: x86: Add test for KVM_PRE_FAULT_MEMORY KVM: x86: Implement kvm_arch_vcpu_pre_fault_memory() KVM: x86/mmu: Make kvm_mmu_do_page_fault() return mapped level KVM: x86/mmu: Account pf_{fixed,emulate,spurious} in callers of "do page fault" KVM: x86/mmu: Bump pf_taken stat only in the "real" page fault handler KVM: Add KVM_PRE_FAULT_MEMORY vcpu ioctl to pre-populate guest memory KVM: Document KVM_PRE_FAULT_MEMORY ioctl mm, virt: merge AS_UNMOVABLE and AS_INACCESSIBLE perf kvm: Add kvm-stat for loongarch64 LoongArch: KVM: Add PV steal time support in guest side ... List of files: /linux/tools/perf/arch/loongarch/util/Build

492ac37fa38faf520b5beae44c930063265ee183 - perf kvm: Add kvm-stat for loongarch64

Wed, 10 Jul 2024 10:50:27 +0200

perf kvm: Add kvm-stat for loongarch64Add support for 'perf kvm stat' on loongarch64 platform, now only kvmexit event is supported.Here is example output about "perf kvm --host stat report" command Event name Samples Sample% Time (ns) Time% Mean Time (ns) Mem Store 83969 51.00% 625697070 8.00% 7451 Mem Read 37641 22.00% 112485730 1.00% 2988 Interrupt 15542 9.00% 20620190 0.00% 1326 IOCSR 15207 9.00% 94296190 1.00% 6200 Hypercall 4873 2.00% 12265280 0.00% 2516 Idle 3713 2.00% 6322055860 87.00% 1702681 FPU 1819 1.00% 2750300 0.00% 1511 Inst Fetch 502 0.00% 1341740 0.00% 2672 Mem Modify 324 0.00% 602240 0.00% 1858 CPUCFG 55 0.00% 77610 0.00% 1411 CSR 12 0.00% 19690 0.00% 1640 LASX 3 0.00% 4870 0.00% 1623 LSX 2 0.00% 2100 0.00% 1050Signed-off-by: Bibo Mao Signed-off-by: Huacai Chen List of files: /linux/tools/perf/arch/loongarch/util/Build

e467705a9fb37f51595aa6deaca085ccb4005454 - perf util: Make util its own library

Tue, 25 Jun 2024 23:41:15 +0200

perf util: Make util its own libraryMake the util directory into its own library. This is done to avoidcompiling code twice, once for the perf tool and once for the perfpython module. For convenience: arch/common.c scripts/perl/Perf-Trace-Util/Context.c scripts/python/Perf-Trace-Util/Context.care made part of this library.Signed-off-by: Ian Rogers Reviewed-by: James Clark Cc: Suzuki K Poulose Cc: Kees Cook Cc: Palmer Dabbelt Cc: Albert Ou Cc: Nick Terrell Cc: Gary Guo Cc: Alex Gaynor Cc: Boqun Feng Cc: Wedson Almeida Filho Cc: Ze Gao Cc: Alice Ryhl Cc: Andrei Vagin Cc: Yicong Yang Cc: Jonathan Cameron Cc: Guo Ren Cc: Miguel Ojeda Cc: Will Deacon Cc: Mike Leach Cc: Leo Yan Cc: Oliver Upton Cc: John Garry Cc: Benno Lossin Cc: Björn Roy Baron Cc: Andreas Hindborg Cc: Paul Walmsley Signed-off-by: Namhyung Kim Link: https://lore.kernel.org/r/20240625214117.953777-7-irogers@google.com List of files: /linux/tools/perf/arch/loongarch/util/Build

2fa5ebe3bc4e31e07a99196455498472417842f2 - tools/perf: Add basic support for LoongArch

Mon, 01 May 2023 11:19:59 +0200

tools/perf: Add basic support for LoongArchAdd basic support for LoongArch, which is very similar to the MIPSversion.Signed-off-by: Ming Wang Signed-off-by: Huacai Chen List of files: /linux/tools/perf/arch/loongarch/util/Build