diff options
| author | Like Xu <likexu@tencent.com> | 2021-08-02 15:08:50 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-08-12 13:19:44 +0200 |
| commit | 344dd5f1a330eb4baddbb81fa28e89ba97dbeaa1 (patch) | |
| tree | 1eb57021330e297f427f7c45ac7b8f484a88bd57 /arch/x86 | |
| parent | 683b47d0ebb10ba0d272604b09686e023d10d40c (diff) | |
perf/x86/amd: Don't touch the AMD64_EVENTSEL_HOSTONLY bit inside the guest
commit df51fe7ea1c1c2c3bfdb81279712fdd2e4ea6c27 upstream.
If we use "perf record" in an AMD Milan guest, dmesg reports a #GP
warning from an unchecked MSR access error on MSR_F15H_PERF_CTLx:
[] unchecked MSR access error: WRMSR to 0xc0010200 (tried to write 0x0000020000110076) at rIP: 0xffffffff8106ddb4 (native_write_msr+0x4/0x20)
[] Call Trace:
[] amd_pmu_disable_event+0x22/0x90
[] x86_pmu_stop+0x4c/0xa0
[] x86_pmu_del+0x3a/0x140
The AMD64_EVENTSEL_HOSTONLY bit is defined and used on the host,
while the guest perf driver should avoid such use.
Fixes: 1018faa6cf23 ("perf/x86/kvm: Fix Host-Only/Guest-Only counting with SVM disabled")
Signed-off-by: Like Xu <likexu@tencent.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Tested-by: Kim Phillips <kim.phillips@amd.com>
Tested-by: Liam Merwick <liam.merwick@oracle.com>
Link: https://lkml.kernel.org/r/20210802070850.35295-1-likexu@tencent.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/events/perf_event.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h index 05659c7b43d4..d2e87dbc55c5 100644 --- a/arch/x86/events/perf_event.h +++ b/arch/x86/events/perf_event.h @@ -799,9 +799,10 @@ void x86_pmu_stop(struct perf_event *event, int flags); static inline void x86_pmu_disable_event(struct perf_event *event) { + u64 disable_mask = __this_cpu_read(cpu_hw_events.perf_ctr_virt_mask); struct hw_perf_event *hwc = &event->hw; - wrmsrl(hwc->config_base, hwc->config); + wrmsrl(hwc->config_base, hwc->config & ~disable_mask); } void x86_pmu_enable_event(struct perf_event *event); |