From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
	by smtp.lore.kernel.org (Postfix) with ESMTP id 66B1AC001DE
	for <linux-kernel@archiver.kernel.org>; Mon, 31 Jul 2023 15:49:07 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S232766AbjGaPtG (ORCPT <rfc822;linux-kernel@archiver.kernel.org>);
        Mon, 31 Jul 2023 11:49:06 -0400
Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55452 "EHLO
        lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S229545AbjGaPsw (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Mon, 31 Jul 2023 11:48:52 -0400
Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55])
        by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C3D64188
        for <linux-kernel@vger.kernel.org>; Mon, 31 Jul 2023 08:48:49 -0700 (PDT)
From:   Thomas Gleixner <tglx@linutronix.de>
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de;
        s=2020; t=1690818528;
        h=from:from:reply-to:subject:subject:date:date:message-id:message-id:
         to:to:cc:cc:mime-version:mime-version:content-type:content-type:
         in-reply-to:in-reply-to:references:references;
        bh=Bdw1u0UgivtOuM/ZUVOI9YZuGeR4kVBk9GgPaRb/C2Q=;
        b=BVnC/4BVp3sAm48kQYtjVlICmRUND4lsCAkiZ4O+nSe8rrMCspC030IbSt/YtOFGTH6hCe
        oiu9PtPH1PjRUCNfJ3EKI406XjI6ulSxE7BDYsWK+466Fa3t6pBHib2Jc9a+zSLjNtaI1o
        czQddf9i+4N9CboJf5Gd1qJBS4ijhc/d4MvD+3KPuoBL8Hsa+5Um3mTs7PFxNXNECNhxVd
        jUnx3hSFZlPCntmQ+afft4Rtkry7AeYEvORfNzcikjgw6rx3pVX6+2ichOL+NWsZgLdwH+
        Ivko6eFTHe/IgkvGI1AW5bouP9isY90XTmGHvXjUZ2+zULsdxvKo1/FeHfP9qw==
DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de;
        s=2020e; t=1690818528;
        h=from:from:reply-to:subject:subject:date:date:message-id:message-id:
         to:to:cc:cc:mime-version:mime-version:content-type:content-type:
         in-reply-to:in-reply-to:references:references;
        bh=Bdw1u0UgivtOuM/ZUVOI9YZuGeR4kVBk9GgPaRb/C2Q=;
        b=Ve/yiMrGO8T2J+Jgy8Qe+F+DIBaJH5YHHl24EEylR65GHiPgWiX1HdS4A3nnqCaJcRJppJ
        2DXfpvKNhV8+2bCQ==
To:     Juergen Gross <jgross@suse.com>,
        LKML <linux-kernel@vger.kernel.org>
Cc:     x86@kernel.org, Andrew Cooper <andrew.cooper3@citrix.com>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Wei Liu <wei.liu@kernel.org>,
        Arjan van de Ven <arjan@linux.intel.com>,
        Michael Kelley <mikelley@microsoft.com>,
        Peter Keresztes Schmidt <peter@keresztesschmidt.de>,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>
Subject: Re: [patch V2 50/58] x86/apic: Provide common init infrastructure
In-Reply-To: <b4f0e874-1e35-e523-8e5a-710bc54af52d@suse.com>
References: <20230724131206.500814398@linutronix.de>
 <20230724132047.554355840@linutronix.de>
 <abfa4548-4367-d8fa-f23f-b2ca4a912258@suse.com> <87v8e0nskd.ffs@tglx>
 <b4f0e874-1e35-e523-8e5a-710bc54af52d@suse.com>
Date:   Mon, 31 Jul 2023 17:48:47 +0200
Message-ID: <87pm48nktc.ffs@tglx>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Mon, Jul 31 2023 at 15:10, Juergen Gross wrote:
> On 31.07.23 15:01, Thomas Gleixner wrote:
>>>    apic_driver(xen_pv_apic);
>> 
>> I wonder whether this explicit install is actually needed at all.
>> Shouldn't the driver be installed via the APIC probing mechanism
>> automagically?
>
> Only in case x86_init.irq.intr_mode_init is set appropriately. Today it is
> a nop for Xen PV, but that can be changed. I'll have a look.

You could simply set that callback to default_setup_apic_routing() and
be done with it.