linux-kernel - [PATCH 00/24] objtool: retpoline and asm-goto validation

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Message-Id: <20180123152539.374360046@infradead.org>
Date:   Tue, 23 Jan 2018 16:25:39 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     David Woodhouse <dwmw2@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Dave Hansen <dave.hansen@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Jason Baron <jbaron@...mai.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 00/24] objtool: retpoline and asm-goto validation

This series adds two features to objtool:

 - retpoline validation; it verifies no indirect jumps/calls are left in
   CONFIG_RETPOLINE=y builds.

   includes fixups for kvm and others

 - asm-goto validation; allows asserting that a block of code is not reachable
   through a dynamic branch.

After this it forces an asm-goto capable compiler to build arch/x86 and removes
the fallback code for static_cpu_has(). After which we can use static_cpu_has()
to guarantee a lack of dynamic branches, which is a requested feature for
various spectre related things.