From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7CEE3C432C1 for ; Tue, 24 Sep 2019 00:38:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5AF7C207FD for ; Tue, 24 Sep 2019 00:38:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2503662AbfIXAiZ (ORCPT ); Mon, 23 Sep 2019 20:38:25 -0400 Received: from mx1.redhat.com ([209.132.183.28]:59884 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2503655AbfIXAiZ (ORCPT ); Mon, 23 Sep 2019 20:38:25 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 1663910CC1ED; Tue, 24 Sep 2019 00:38:25 +0000 (UTC) Received: from mail (ovpn-120-159.rdu2.redhat.com [10.10.120.159]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 4B0A710013A1; Tue, 24 Sep 2019 00:38:22 +0000 (UTC) Date: Mon, 23 Sep 2019 20:38:21 -0400 From: Andrea Arcangeli To: Paolo Bonzini Cc: Sean Christopherson , Vitaly Kuznetsov , "Dr. David Alan Gilbert" , Marcelo Tosatti , Peter Xu , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 15/17] KVM: retpolines: x86: eliminate retpoline from vmx.c exit handlers Message-ID: <20190924003821.GA4230@redhat.com> References: <20190920212509.2578-1-aarcange@redhat.com> <20190920212509.2578-16-aarcange@redhat.com> <87o8zb8ik1.fsf@vitty.brq.redhat.com> <7329012d-0b3b-ce86-f58d-3d2d5dc5a790@redhat.com> <20190923190514.GB19996@redhat.com> <20190923202349.GL18195@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.65]); Tue, 24 Sep 2019 00:38:25 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Hi Paolo, On Tue, Sep 24, 2019 at 02:15:39AM +0200, Paolo Bonzini wrote: > Do you really need that? Why couldn't the handle_* functions simply be > exported from nested.c to vmx.c? I prefer the direct call too indeed. If Sean doesn't want to export those generic names to the whole kernel it would be enough to #include "nested.c" from vmx.c, and you'd still have it private but with no additional checks and no additional extern call. It's not like kvm-intel can be built without linking nested.o anyway. This overall is a C shortcoming of some sort if you've to resort to #include "nested.c" to keep the function hidden in kvm-intel.o despite it's implemented in two different object files. One should be able to limit the scope of an extern function declaration per a group of object files and to drop the declaration before linking that object beyond that initial group. Thanks, Andrea