linux-kernel - Re: [Xen-devel] [PATCH 11/13] x86/paravirt: Add paravirt alternatives infrastructure

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Date:   Tue, 17 Oct 2017 11:36:57 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Andrew Cooper <andrew.cooper3@...rix.com>,
        Juergen Gross <jgross@...e.com>,
        Rusty Russell <rusty@...tcorp.com.au>,
        Mike Galbraith <efault@....de>, xen-devel@...ts.xenproject.org,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Slaby <jslaby@...e.cz>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Sasha Levin <alexander.levin@...izon.com>,
        Chris Wright <chrisw@...s-sol.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
        live-patching@...r.kernel.org, Alok Kataria <akataria@...are.com>,
        virtualization@...ts.linux-foundation.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [Xen-devel] [PATCH 11/13] x86/paravirt: Add paravirt alternatives
 infrastructure

On 10/17/2017 10:36 AM, Josh Poimboeuf wrote:
>
> Maybe we can add a new field to the alternatives entry struct which
> specifies the offset to the CALL instruction, so apply_alternatives()
> can find it.

We'd also have to assume that the restore part of an alternative entry
is the same size as the save part. Which is true now.

-boris