linux-kernel - Re: [RFC 0/5] perf: Per PMU access controls (paranoid setting)

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Message-ID: <20180928205907.GD32651@tassilo.jf.intel.com>
Date:   Fri, 28 Sep 2018 13:59:07 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jann Horn <jannh@...gle.com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Thomas Gleixner <tglx@...utronix.de>, tursulin@...ulin.net,
        kernel list <linux-kernel@...r.kernel.org>,
        tvrtko.ursulin@...ux.intel.com,
        Peter Zijlstra <peterz@...radead.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, maddy@...ux.vnet.ibm.com,
        alexey.budankov@...ux.intel.com, Kees Cook <keescook@...omium.org>
Subject: Re: [RFC 0/5] perf: Per PMU access controls (paranoid setting)

> > This new file descriptor argument doesn't exist today so it would
> > need to create a new system call with more arguments
> 
> Is that true? The first argument is a pointer to a struct that
> contains its own size, so it can be expanded without an ABI break. I
> don't see any reason why you couldn't cram more stuff in there.

You're right we could put the fd into the perf_event, but the following is
still true:

> > Obviously we would need to keep the old system call around
> > for compability, so you would need to worry about this
> > interaction in any case!
> >
> > So tying it together doesn't make any sense, because
> > the problem has to be solved separately anyways.


-Andi