linux-kernel - [PATCH v2 00/24] objtool/x86: noinstr vs PARAVIRT

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Date:   Thu, 24 Jun 2021 11:40:59 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     jpoimboe@...hat.com, tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        joro@...tes.org, boris.ostrovsky@...cle.com, jgross@...e.com,
        x86@...nel.org, mbenes@...e.com, rostedt@...dmis.org,
        dvyukov@...gle.com, elver@...gle.com
Subject: [PATCH v2 00/24] objtool/x86: noinstr vs PARAVIRT

Hi,

Per long standing request from Thomas, this makes the noinstr validation work
with PARAVIRT=y.

It isn't exactly pretty, but it does work.

With all this on top of tip/master (which includes some of the previous round),
all (*) the robots seem to get is endless garbage like:

  vmlinux.o: warning: objtool: __rdgsbase_inactive()+0x24: call to ftrace_likely_update() leaves .noinstr.text section

And my secret plan is to pull the KPTI CR3 swizzling into C such that all that
will insta explode and become unfixable.

Steve, can I please delete TRACE_BRANCH_PROFILING and PROFILE_ALL_BRANCHES already?

(*) there were also a few reports from 0day running out of memory.