tools arch x86: Sync msr-index.h to pick 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>