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

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Message-ID: <20171017201743.tnw6wulu4gjvkqli@treble>
Date:   Tue, 17 Oct 2017 15:17:43 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.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 Tue, Oct 17, 2017 at 11:36:57AM -0400, Boris Ostrovsky wrote:
> 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.

Why?

-- 
Josh