linux-kernel - Re: [PATCH v1 2/2] perf/core: Fake regs for leaked kernel samples

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Date:   Tue, 11 Aug 2020 09:59:24 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Jin, Yao" <yao.jin@...ux.intel.com>
Cc:     mingo@...hat.com, oleg@...hat.com, acme@...nel.org,
        jolsa@...nel.org, Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com,
        alexander.shishkin@...ux.intel.com, mark.rutland@....com
Subject: Re: [PATCH v1 2/2] perf/core: Fake regs for leaked kernel samples

On Tue, Aug 11, 2020 at 03:50:43PM +0800, Jin, Yao wrote:
> Could I post v2 which basically refers to your patch but removes some
> conditions since I see some issues in test if we use these conditions.
> 
>  1. Remove '!event->attr.exclude_hv || !event->attr.exclude_host ||
>     !event->attr.exclude_guest' at the entry of sanitize_sample_regs().
> 
>  2. Remove '!attr.exclude_hv || !attr.exclude_host || !attr.exclude_guest'
>     at the perf_event_open syscall entry.

exclude_host, maybe -- due to the dodgy semantics of it, but the others
should definitely be there.