linux/tools/arch, branch v5.17

tools headers cpufeatures: Sync with the kernel sources

2022-03-12T13:38:05Z

To pick the changes from: d45476d983240937 ("x86/speculation: Rename RETPOLINE_AMD to RETPOLINE_LFENCE") Its just a comment fixup. This only causes these perf files to be rebuilt: 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 at 'tools/arch/x86/include/asm/cpufeatures.h' differs from latest version at 'arch/x86/include/asm/cpufeatures.h' diff -u tools/arch/x86/include/asm/cpufeatures.h arch/x86/include/asm/cpufeatures.h Cc: Borislav Petkov Cc: Peter Zijlstra (Intel) Link: https://lore.kernel.org/lkml/YiyiHatGaJQM7l/Y@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

tools kvm headers arm64: Update KVM headers from the kernel sources

2022-03-12T13:33:13Z

To pick the changes from: a5905d6af492ee6a ("KVM: arm64: Allow SMCCC_ARCH_WORKAROUND_3 to be discovered and migrated") That don't causes any changes in tooling (when built on x86), only addresses this perf build warning: Warning: Kernel ABI header at 'tools/arch/arm64/include/uapi/asm/kvm.h' differs from latest version at 'arch/arm64/include/uapi/asm/kvm.h' diff -u tools/arch/arm64/include/uapi/asm/kvm.h arch/arm64/include/uapi/asm/kvm.h Cc: James Morse Link: https://lore.kernel.org/lkml/YiyhAK6sVPc83FaI@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

Merge tag 'x86_bugs_for_v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2022-03-08T01:29:47Z

Pull x86 spectre fixes from Borislav Petkov: - Mitigate Spectre v2-type Branch History Buffer attacks on machines which support eIBRS, i.e., the hardware-assisted speculation restriction after it has been shown that such machines are vulnerable even with the hardware mitigation. - Do not use the default LFENCE-based Spectre v2 mitigation on AMD as it is insufficient to mitigate such attacks. Instead, switch to retpolines on all AMD by default. - Update the docs and add some warnings for the obviously vulnerable cmdline configurations. * tag 'x86_bugs_for_v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/speculation: Warn about eIBRS + LFENCE + Unprivileged eBPF + SMT x86/speculation: Warn about Spectre v2 LFENCE mitigation x86/speculation: Update link to AMD speculation whitepaper x86/speculation: Use generic retpoline by default on AMD x86/speculation: Include unprivileged eBPF status in Spectre v2 mitigation reporting Documentation/hw-vuln: Update spectre doc x86/speculation: Add eIBRS + Retpoline options x86/speculation: Rename RETPOLINE_AMD to RETPOLINE_LFENCE

tools arch x86: Sync the msr-index.h copy with the kernel sources

2022-02-22T20:43:05Z

To pick up the changes in: 3915035282573c5e ("KVM: x86: SVM: move avic definitions from AMD's spec to svm.h") Addressing these tools/perf build warnings: diff -u tools/arch/x86/include/asm/msr-index.h arch/x86/include/asm/msr-index.h Warning: Kernel ABI header at 'tools/arch/x86/include/asm/msr-index.h' differs from latest version at '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 2022-02-22 17:35:36.996271430 -0300 +++ after 2022-02-22 17:35:46.258503347 -0300 @@ -287,6 +287,7 @@ [0xc0010114 - x86_AMD_V_KVM_MSRs_offset] = "VM_CR", [0xc0010115 - x86_AMD_V_KVM_MSRs_offset] = "VM_IGNNE", [0xc0010117 - x86_AMD_V_KVM_MSRs_offset] = "VM_HSAVE_PA", + [0xc001011b - x86_AMD_V_KVM_MSRs_offset] = "AMD64_SVM_AVIC_DOORBELL", [0xc001011e - x86_AMD_V_KVM_MSRs_offset] = "AMD64_VM_PAGE_FLUSH", [0xc001011f - x86_AMD_V_KVM_MSRs_offset] = "AMD64_VIRT_SPEC_CTRL", [0xc0010130 - x86_AMD_V_KVM_MSRs_offset] = "AMD64_SEV_ES_GHCB", $ And this gets rebuilt: CC /tmp/build/perf/trace/beauty/tracepoints/x86_msr.o LD /tmp/build/perf/trace/beauty/tracepoints/perf-in.o LD /tmp/build/perf/trace/beauty/perf-in.o CC /tmp/build/perf/util/amd-sample-raw.o LD /tmp/build/perf/util/perf-in.o LD /tmp/build/perf/perf-in.o LINK /tmp/build/perf/perf Now one can trace systemwide asking to see backtraces to where those MSRs are being read/written with: # perf trace -e msr:*_msr/max-stack=32/ --filter="msr>=AMD64_SVM_AVIC_DOORBELL && msr<=AMD64_SEV_ES_GHCB" ^C# If we use -v (verbose mode) we can see what it does behind the scenes: # perf trace -v -e msr:*_msr/max-stack=32/ --filter="msr>=AMD64_SVM_AVIC_DOORBELL && msr<=AMD64_SEV_ES_GHCB" Using CPUID AuthenticAMD-25-21-0 0xc001011b 0xc0010130 New filter for msr:read_msr: (msr>=0xc001011b && msr<=0xc0010130) && (common_pid != 1019953 && common_pid != 3629) 0xc001011b 0xc0010130 New filter for msr:write_msr: (msr>=0xc001011b && msr<=0xc0010130) && (common_pid != 1019953 && common_pid != 3629) mmap size 528384B ^C# 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]) # Cc: Adrian Hunter Cc: Ian Rogers Cc: Jiri Olsa Cc: Maxim Levitsky Cc: Namhyung Kim Cc: Paolo Bonzini Link: http://lore.kernel.org/lkml/YhVKxaft+z8rpOfy@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

x86/speculation: Rename RETPOLINE_AMD to RETPOLINE_LFENCE

2022-02-21T09:21:28Z

The RETPOLINE_AMD name is unfortunate since it isn't necessarily AMD only, in fact Hygon also uses it. Furthermore it will likely be sufficient for some Intel processors. Therefore rename the thing to RETPOLINE_LFENCE to better describe what it is. Add the spectre_v2=retpoline,lfence option as an alias to spectre_v2=retpoline,amd to preserve existing setups. However, the output of /sys/devices/system/cpu/vulnerabilities/spectre_v2 will be changed. [ bp: Fix typos, massage. ] Co-developed-by: Josh Poimboeuf Signed-off-by: Josh Poimboeuf Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Borislav Petkov Reviewed-by: Thomas Gleixner

tools headers cpufeatures: Sync with the kernel sources

2022-02-01T15:21:47Z

To pick the changes from: 690a757d610e50c2 ("kvm: x86: Add CPUID support for Intel AMX") This only causes these perf files to be rebuilt: 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 at 'tools/arch/x86/include/asm/cpufeatures.h' differs from latest version at 'arch/x86/include/asm/cpufeatures.h' diff -u tools/arch/x86/include/asm/cpufeatures.h arch/x86/include/asm/cpufeatures.h Cc: Jing Liu Cc: Paolo Bonzini Link: https://lore.kernel.org/lkml/YflQCEO9FRLeTmlB@kernel.org/ Signed-off-by: Arnaldo Carvalho de Melo

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

2022-01-28T17:00:26Z

Pull kvm fixes from Paolo Bonzini: "Two larger x86 series: - Redo incorrect fix for SEV/SMAP erratum - Windows 11 Hyper-V workaround Other x86 changes: - Various x86 cleanups - Re-enable access_tracking_perf_test - Fix for #GP handling on SVM - Fix for CPUID leaf 0Dh in KVM_GET_SUPPORTED_CPUID - Fix for ICEBP in interrupt shadow - Avoid false-positive RCU splat - Enable Enlightened MSR-Bitmap support for real ARM: - Correctly update the shadow register on exception injection when running in nVHE mode - Correctly use the mm_ops indirection when performing cache invalidation from the page-table walker - Restrict the vgic-v3 workaround for SEIS to the two known broken implementations Generic code changes: - Dead code cleanup" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (43 commits) KVM: eventfd: Fix false positive RCU usage warning KVM: nVMX: Allow VMREAD when Enlightened VMCS is in use KVM: nVMX: Implement evmcs_field_offset() suitable for handle_vmread() KVM: nVMX: Rename vmcs_to_field_offset{,_table} KVM: nVMX: eVMCS: Filter out VM_EXIT_SAVE_VMX_PREEMPTION_TIMER KVM: nVMX: Also filter MSR_IA32_VMX_TRUE_PINBASED_CTLS when eVMCS selftests: kvm: check dynamic bits against KVM_X86_XCOMP_GUEST_SUPP KVM: x86: add system attribute to retrieve full set of supported xsave states KVM: x86: Add a helper to retrieve userspace address from kvm_device_attr selftests: kvm: move vm_xsave_req_perm call to amx_test KVM: x86: Sync the states size with the XCR0/IA32_XSS at, any time KVM: x86: Update vCPU's runtime CPUID on write to MSR_IA32_XSS KVM: x86: Keep MSR_IA32_XSS unchanged for INIT KVM: x86: Free kvm_cpuid_entry2 array on post-KVM_RUN KVM_SET_CPUID{,2} KVM: nVMX: WARN on any attempt to allocate shadow VMCS for vmcs02 KVM: selftests: Don't skip L2's VMCALL in SMM test for SVM guest KVM: x86: Check .flags in kvm_cpuid_check_equal() too KVM: x86: Forcibly leave nested virt when SMM state is toggled KVM: SVM: drop unnecessary code in svm_hv_vmcb_dirty_nested_enlightenments() KVM: SVM: hyper-v: Enable Enlightened MSR-Bitmap support for real ...

selftests: kvm: check dynamic bits against KVM_X86_XCOMP_GUEST_SUPP

2022-01-28T12:38:25Z

Provide coverage for the new API. Signed-off-by: Paolo Bonzini

tools headers UAPI: Sync x86 arch prctl headers with the kernel sources

2022-01-19T17:41:29Z

To pick the changes in this cset: 980fe2fddcff2193 ("x86/fpu: Extend fpu_xstate_prctl() with guest permissions") This picks these new prctls: $ tools/perf/trace/beauty/x86_arch_prctl.sh > /tmp/before $ cp arch/x86/include/uapi/asm/prctl.h tools/arch/x86/include/uapi/asm/prctl.h $ tools/perf/trace/beauty/x86_arch_prctl.sh > /tmp/after $ diff -u /tmp/before /tmp/after --- /tmp/before 2022-01-19 14:40:05.049394977 -0300 +++ /tmp/after 2022-01-19 14:40:35.628154565 -0300 @@ -9,6 +9,8 @@ [0x1021 - 0x1001]= "GET_XCOMP_SUPP", [0x1022 - 0x1001]= "GET_XCOMP_PERM", [0x1023 - 0x1001]= "REQ_XCOMP_PERM", + [0x1024 - 0x1001]= "GET_XCOMP_GUEST_PERM", + [0x1025 - 0x1001]= "REQ_XCOMP_GUEST_PERM", }; #define x86_arch_prctl_codes_2_offset 0x2001 $ With this 'perf trace' can translate those numbers into strings and use the strings in filter expressions: # perf trace -e prctl 0.000 ( 0.011 ms): DOM Worker/3722622 prctl(option: SET_NAME, arg2: 0x7f9c014b7df5) = 0 0.032 ( 0.002 ms): DOM Worker/3722622 prctl(option: SET_NAME, arg2: 0x7f9bb6b51580) = 0 5.452 ( 0.003 ms): StreamT~ns #30/3722623 prctl(option: SET_NAME, arg2: 0x7f9bdbdfeb70) = 0 5.468 ( 0.002 ms): StreamT~ns #30/3722623 prctl(option: SET_NAME, arg2: 0x7f9bdbdfea70) = 0 24.494 ( 0.009 ms): IndexedDB #556/3722624 prctl(option: SET_NAME, arg2: 0x7f562a32ae28) = 0 24.540 ( 0.002 ms): IndexedDB #556/3722624 prctl(option: SET_NAME, arg2: 0x7f563c6d4b30) = 0 670.281 ( 0.008 ms): systemd-userwo/3722339 prctl(option: SET_NAME, arg2: 0x564be30805c8) = 0 670.293 ( 0.002 ms): systemd-userwo/3722339 prctl(option: SET_NAME, arg2: 0x564be30800f0) = 0 ^C# This addresses these perf build warnings: Warning: Kernel ABI header at 'tools/arch/x86/include/uapi/asm/prctl.h' differs from latest version at 'arch/x86/include/uapi/asm/prctl.h' diff -u tools/arch/x86/include/uapi/asm/prctl.h arch/x86/include/uapi/asm/prctl.h Cc: Paolo Bonzini Cc: Thomas Gleixner Signed-off-by: Arnaldo Carvalho de Melo

Merge tag 'perf-tools-for-v5.17-2022-01-16' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux

2022-01-18T04:32:11Z

Pull perf tool updates from Arnaldo Carvalho de Melo: "New features: - Add 'trace' subcommand for 'perf ftrace', setting the stage for more 'perf ftrace' subcommands. Not using a subcommand yields the previous behaviour of 'perf ftrace'. - Add 'latency' subcommand to 'perf ftrace', that can use the function graph tracer or a BPF optimized one, via the -b/--use-bpf option. E.g.: $ sudo perf ftrace latency -a -T mutex_lock sleep 1 # DURATION | COUNT | GRAPH | 0 - 1 us | 4596 | ######################## | 1 - 2 us | 1680 | ######### | 2 - 4 us | 1106 | ##### | 4 - 8 us | 546 | ## | 8 - 16 us | 562 | ### | 16 - 32 us | 1 | | 32 - 64 us | 0 | | 64 - 128 us | 0 | | 128 - 256 us | 0 | | 256 - 512 us | 0 | | 512 - 1024 us | 0 | | 1 - 2 ms | 0 | | 2 - 4 ms | 0 | | 4 - 8 ms | 0 | | 8 - 16 ms | 0 | | 16 - 32 ms | 0 | | 32 - 64 ms | 0 | | 64 - 128 ms | 0 | | 128 - 256 ms | 0 | | 256 - 512 ms | 0 | | 512 - 1024 ms | 0 | | 1 - ... s | 0 | | The original implementation of this command was in the bcc tool. - Support --cputype option for hybrid events in 'perf stat'. Improvements: - Call chain improvements for ARM64. - No need to do any affinity setup when profiling pids. - Reduce multiplexing with duration_time in 'perf stat' metrics. - Improve error message for uncore events, stating that some event groups are can only be used in system wide (-a) mode. - perf stat metric group leader fixes/improvements, including arch specific changes to better support Intel topdown events. - Probe non-deprecated sysfs path first, i.e. try the path /sys/devices/system/cpu/cpuN/topology/thread_siblings first, then the old /sys/devices/system/cpu/cpuN/topology/core_cpus. - Disable debuginfod by default in 'perf record', to avoid stalls on distros such as Fedora 35. - Use unbuffered output in 'perf bench' when pipe/tee'ing to a file. - Enable ignore_missing_thread in 'perf trace' Fixes: - Avoid TUI crash when navigating in the annotation of recursive functions. - Fix hex dump character output in 'perf script'. - Fix JSON indentation to 4 spaces standard in the ARM vendor event files. - Fix use after free in metric__new(). - Fix IS_ERR_OR_NULL() usage in the perf BPF loader. - Fix up cross-arch register support, i.e. when printing register names take into account the architecture where the perf.data file was collected. - Fix SMT fallback with large core counts. - Don't lower case MetricExpr when parsing JSON files so as not to lose info such as the ":G" event modifier in metrics. perf test: - Add basic stress test for sigtrap handling to 'perf test'. - Fix 'perf test' failures on s/390 - Enable system wide for metricgroups test in 'perf test´. - Use 3 digits for test numbering now we can have more tests. Arch specific: - Add events for Arm Neoverse N2 in the ARM JSON vendor event files - Support PERF_MEM_LVLNUM encodings in powerpc, that came from a single patch series, where I incorrectly merged the kernel bits, that were then reverted after coordination with Michael Ellerman and Stephen Rothwell. - Add ARM SPE total latency as PERF_SAMPLE_WEIGHT. - Update AMD documentation, with info on raw event encoding. - Add support for global and local variants of the "p_stage_cyc" sort key, applicable to perf.data files collected on powerpc. - Remove duplicate and incorrect aux size checks in the ARM CoreSight ETM code. Refactorings: - Add a perf_cpu abstraction to disambiguate CPUs and CPU map indexes, fixing problems along the way. - Document CPU map methods. UAPI sync: - Update arch/x86/lib/mem{cpy,set}_64.S copies used in 'perf bench mem memcpy' - Sync UAPI files with the kernel sources: drm, msr-index, cpufeatures. Build system - Enable warnings through HOSTCFLAGS. - Drop requirement for libstdc++.so for libopencsd check libperf: - Make libperf adopt perf_counts_values__scale() from tools/perf/util/. - Add a stat multiplexing test to libperf" * tag 'perf-tools-for-v5.17-2022-01-16' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux: (115 commits) perf record: Disable debuginfod by default perf evlist: No need to do any affinity setup when profiling pids perf cpumap: Add is_dummy() method perf metric: Fix metric_leader perf cputopo: Fix CPU topology reading on s/390 perf metricgroup: Fix use after free in metric__new() libperf tests: Update a use of the new cpumap API perf arm: Fix off-by-one directory path tools arch x86: Sync the msr-index.h copy with the kernel sources tools headers cpufeatures: Sync with the kernel sources tools headers UAPI: Update tools's copy of drm.h header tools arch: Update arch/x86/lib/mem{cpy,set}_64.S copies used in 'perf bench mem memcpy' perf pmu-events: Don't lower case MetricExpr perf expr: Add debug logging for literals perf tools: Probe non-deprecated sysfs path 1st perf tools: Fix SMT fallback with large core counts perf cpumap: Give CPUs their own type perf stat: Correct first_shadow_cpu to return index perf script: Fix flipped index and cpu perf c2c: Use more intention revealing iterator ...