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Message-ID: <9d546cfa-93e0-5b53-9100-5e9b091fac1b@intel.com>
Date:   Thu, 13 Jan 2022 20:14:32 +0100
From:   "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Huang Rui <ray.huang@....com>
CC:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        "Adrian Hunter" <adrian.hunter@...el.com>,
        Ian Rogers <irogers@...gle.com>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        <linux-perf-users@...r.kernel.org>
Subject: Re: [PATCH 1/1 FYI] tools arch x86: Sync the msr-index.h copy with
 the kernel sources

On 1/13/2022 3:25 PM, Arnaldo Carvalho de Melo wrote:
> To pick up the changes in:
>
>    89aa94b4a218339b ("x86/msr: Add AMD CPPC MSR definitions")
>
> 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	2022-01-13 10:59:51.743416890 -0300
>    +++ after	2022-01-13 11:00:00.776644178 -0300
>    @@ -303,6 +303,11 @@
>   	  [0xc0010299 - x86_AMD_V_KVM_MSRs_offset] = "AMD_RAPL_POWER_UNIT",
>   	  [0xc001029a - x86_AMD_V_KVM_MSRs_offset] = "AMD_CORE_ENERGY_STATUS",
>   	  [0xc001029b - x86_AMD_V_KVM_MSRs_offset] = "AMD_PKG_ENERGY_STATUS",
>    +       [0xc00102b0 - x86_AMD_V_KVM_MSRs_offset] = "AMD_CPPC_CAP1",
>    +       [0xc00102b1 - x86_AMD_V_KVM_MSRs_offset] = "AMD_CPPC_ENABLE",
>    +       [0xc00102b2 - x86_AMD_V_KVM_MSRs_offset] = "AMD_CPPC_CAP2",
>    +       [0xc00102b3 - x86_AMD_V_KVM_MSRs_offset] = "AMD_CPPC_REQ",
>    +       [0xc00102b4 - x86_AMD_V_KVM_MSRs_offset] = "AMD_CPPC_STATUS",
>   	  [0xc00102f0 - x86_AMD_V_KVM_MSRs_offset] = "AMD_PPIN_CTL",
>   	  [0xc00102f1 - x86_AMD_V_KVM_MSRs_offset] = "AMD_PPIN",
>     };
>    $
>
> And this gets rebuilt:
>
>    CC       /tmp/build/perf/trace/beauty/tracepoints/x86_msr.o
>    INSTALL  trace_plugins
>    LD       /tmp/build/perf/trace/beauty/tracepoints/perf-in.o
>    LD       /tmp/build/perf/trace/beauty/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>=AMD_CPPC_CAP1 && msr<="
>    Failed to set filter "(msr>=0xc00102b0 && msr<=) && (common_pid != 2612094 && common_pid != 3841)" on event msr:read_msr with 22 (Invalid argument)
>    # ^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>=AMD_CPPC_CAP1 && msr<=AMD_CPPC_STATUS"
>    <SNIP>
>    New filter for msr:read_msr: (msr>=0xc00102b0 && msr<=0xc00102b4) && (common_pid != 2612102 && common_pid != 3841)
>    New filter for msr:write_msr: (msr>=0xc00102b0 && msr<=0xc00102b4) && (common_pid != 2612102 && common_pid != 3841)
>    <SNIP>
>    ^C[root@...e ~]#
>
> 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: Huang Rui <ray.huang@....com>
> Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>


> ---
>   tools/arch/x86/include/asm/msr-index.h | 17 +++++++++++++++++
>   1 file changed, 17 insertions(+)
>
> diff --git a/tools/arch/x86/include/asm/msr-index.h b/tools/arch/x86/include/asm/msr-index.h
> index 01e2650b958591e0..3faf0f97edb1bcd3 100644
> --- a/tools/arch/x86/include/asm/msr-index.h
> +++ b/tools/arch/x86/include/asm/msr-index.h
> @@ -486,6 +486,23 @@
>   
>   #define MSR_AMD64_VIRT_SPEC_CTRL	0xc001011f
>   
> +/* AMD Collaborative Processor Performance Control MSRs */
> +#define MSR_AMD_CPPC_CAP1		0xc00102b0
> +#define MSR_AMD_CPPC_ENABLE		0xc00102b1
> +#define MSR_AMD_CPPC_CAP2		0xc00102b2
> +#define MSR_AMD_CPPC_REQ		0xc00102b3
> +#define MSR_AMD_CPPC_STATUS		0xc00102b4
> +
> +#define AMD_CPPC_LOWEST_PERF(x)		(((x) >> 0) & 0xff)
> +#define AMD_CPPC_LOWNONLIN_PERF(x)	(((x) >> 8) & 0xff)
> +#define AMD_CPPC_NOMINAL_PERF(x)	(((x) >> 16) & 0xff)
> +#define AMD_CPPC_HIGHEST_PERF(x)	(((x) >> 24) & 0xff)
> +
> +#define AMD_CPPC_MAX_PERF(x)		(((x) & 0xff) << 0)
> +#define AMD_CPPC_MIN_PERF(x)		(((x) & 0xff) << 8)
> +#define AMD_CPPC_DES_PERF(x)		(((x) & 0xff) << 16)
> +#define AMD_CPPC_ENERGY_PERF_PREF(x)	(((x) & 0xff) << 24)
> +
>   /* Fam 17h MSRs */
>   #define MSR_F17H_IRPERF			0xc00000e9
>   


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