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| author | Borislav Petkov <bp@suse.de> | 2022-05-16 18:48:38 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-05-18 01:08:26 +0300 |
| commit | 841b51e4a3590866d17fa2663c64688c25b891b1 (patch) | |
| tree | c125d9ef90621ec49a6f51bec7561f9a4db98705 /arch/x86/events | |
| parent | 3c27b0c6ea48bc61492a138c410e262735d660ab (diff) | |
| download | linux-841b51e4a3590866d17fa2663c64688c25b891b1.tar.xz | |
perf/x86/amd: Run AMD BRS code only on supported hw
This fires on a Fam16h machine here:
unchecked MSR access error: WRMSR to 0xc000010f (tried to write 0x0000000000000018) \
at rIP: 0xffffffff81007db1 (amd_brs_reset+0x11/0x50)
Call Trace:
<TASK>
amd_pmu_cpu_starting
? x86_pmu_dead_cpu
x86_pmu_starting_cpu
cpuhp_invoke_callback
? x86_pmu_starting_cpu
? x86_pmu_dead_cpu
cpuhp_issue_call
? x86_pmu_starting_cpu
__cpuhp_setup_state_cpuslocked
? x86_pmu_dead_cpu
? x86_pmu_starting_cpu
__cpuhp_setup_state
? map_vsyscall
init_hw_perf_events
? map_vsyscall
do_one_initcall
? _raw_spin_unlock_irqrestore
? try_to_wake_up
kernel_init_freeable
? rest_init
kernel_init
ret_from_fork
because that CPU hotplug callback gets executed on any AMD CPU - not
only on the BRS-enabled ones. Check the BRS feature bit properly.
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-By: Stephane Eranian <eranian@google.com>
Link: https://lkml.kernel.org/r/20220516154838.7044-1-bp@alien8.de
Diffstat (limited to 'arch/x86/events')
| -rw-r--r-- | arch/x86/events/amd/brs.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/events/amd/brs.c b/arch/x86/events/amd/brs.c index 895c82165d85..bee8765a1e9b 100644 --- a/arch/x86/events/amd/brs.c +++ b/arch/x86/events/amd/brs.c @@ -57,7 +57,7 @@ static inline u64 get_debug_extn_cfg(void) static bool __init amd_brs_detect(void) { - if (!boot_cpu_has(X86_FEATURE_BRS)) + if (!cpu_feature_enabled(X86_FEATURE_BRS)) return false; switch (boot_cpu_data.x86) { @@ -112,6 +112,9 @@ static inline int amd_brs_get_tos(union amd_debug_extn_cfg *cfg) */ void amd_brs_reset(void) { + if (!cpu_feature_enabled(X86_FEATURE_BRS)) + return; + /* * Reset config */ |