Messages in this thread | | | Date | Mon, 25 Jan 2021 12:47:23 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH v3 04/17] perf: x86/ds: Handle guest PEBS overflow PMI and inject it to guest |
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On Mon, Jan 25, 2021 at 04:26:22PM +0800, Like Xu wrote:
> In the host and guest PEBS both enabled case, > we'll get a crazy dmesg *bombing* about spurious PMI warning > if we pass the host PEBS PMI "harmlessly" to the guest: > > [11261.502536] Uhhuh. NMI received for unknown reason 2c on CPU 36. > [11261.502539] Do you have a strange power saving mode enabled? > [11261.502541] Dazed and confused, but trying to continue
How? AFAICT handle_pmi_common() will increment handled when GLOBAL_STATUS_BUFFER_OVF_BIT is set, irrespective of DS containing data.
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