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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2E5D9C32793 for ; Wed, 18 Jan 2023 14:38:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231435AbjAROiG (ORCPT ); Wed, 18 Jan 2023 09:38:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37794 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231362AbjAROhn (ORCPT ); Wed, 18 Jan 2023 09:37:43 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B4B2B5EFA1 for ; Wed, 18 Jan 2023 06:26:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:To:From:Subject:Message-ID:Sender:Reply-To:Cc: Content-Transfer-Encoding:Content-ID:Content-Description; bh=WBwOmcM8+0BE16W8TBX0vypbXonuCPHDr8KKzxBbJQU=; b=KjycyDsd78SljD0djof5nByeVV Z01xqZ5SVR38xIWqRK6s/Obdq3qTYf03q5K0zpupSoZ1ufvw+VfaUll76zGUC8xFjVXZ/eNaSZL/d j9fC4t7wYtFpRBYHSZxB2IERvDtFMVibGl70ynVNIHvwUhw6dMDUzyIJNJZbdt2QvQjmlmrgidZSI 10w/tnFqnv7KepjwATQPQ718kDWyT3AiNCzlnekKoO+t4p6HYa7d+BnfbDHXFNh1rzJ3dqVvS7Hue TYmsXaZQveqkvptfaCF0MyI/QjmarbEp9HCpeT7Pkc9TaR7M5P7qqqw7NgE/C0uGxI0/8fP+BhxUI DLtjhDTQ==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pI9Os-0003f6-AH; Wed, 18 Jan 2023 14:26:50 +0000 Message-ID: <1ce5f5501214f1073f4eb86b2fdf3f54b2400057.camel@infradead.org> Subject: Re: [PATCH] xen: Allow platform PCI interrupt to be shared From: David Woodhouse To: Andrew Cooper , Juergen Gross , Stefano Stabellini , xen-devel , "linux-kernel@vger.kernel.org" , Thomas Gleixner , Paul Durrant Date: Wed, 18 Jan 2023 14:26:49 +0000 In-Reply-To: <973f9ebd-173e-6753-7799-a660994e38de@citrix.com> References: <82e6a68f3cb8c0e440f7dc848fa3444725b3f893.camel@infradead.org> <973f9ebd-173e-6753-7799-a660994e38de@citrix.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-hNVI4o99yM337Xtbo0NU" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-hNVI4o99yM337Xtbo0NU Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2023-01-18 at 14:22 +0000, Andrew Cooper wrote: > On 18/01/2023 2:06 pm, David Woodhouse wrote: > > On Wed, 2023-01-18 at 13:53 +0000, Andrew Cooper wrote: > > > On 18/01/2023 12:22 pm, David Woodhouse wrote: > > > > Signed-off-by: David Woodhouse > > > > --- > > > > What does xen_evtchn_do_upcall() exist for? Can we delete it? I don= 't > > > > see it being called anywhere. > > > Seems the caller was dropped by > > > cb09ea2924cbf1a42da59bd30a59cc1836240bcb, but the CONFIG_PVHVM looks > > > bogus because the precondition to setting it up was being in a Xen HV= M > > > guest, and the guest is taking evtchns by vector either way. > > >=20 > > > PV guests use the entrypoint called exc_xen_hypervisor_callback which > > > really ought to gain a PV in its name somewhere.=C2=A0 Also the comme= nts look > > > distinctly suspect. > > Yeah. I couldn't *see* any asm or macro magic which would reference > > xen_evtchn_do_upcall, and removing it from my build (with CONFIG_XEN_PV > > enabled) also didn't break anything. > >=20 > > > Some tidying in this area would be valuable. > > Indeed. I just need Paul or myself to throw in a basic XenStore > > implementation so we can provide a PV disk, and I should be able to do > > quickfire testing of PV guests too with 'qemu -kernel' and a PV shim. > >=20 > > PVHVM would be an entertaining thing to support too; I suppose that's > > mostly a case of basing it on the microvm qemu platform, or perhaps > > even *more* minimal x86-based platform? >=20 > There is no actual thing called PVHVM.=C2=A0 That diagram has caused far = more > damage than good... Perhaps so. Even CONFIG_XEN_PVHVM in the kernel is a nonsense, because it's just automatically set based on (XEN && X86_LOCAL_APIC). And CONFIG_XEN depends on X86_LOCAL_APIC anyway. Which is why isn't never mattered that the vector callback handling was under #ifdef CONFIG_XEN_PVHVM not just CONFIG_XEN. > There's HVM (and by this, I mean the hypervisor's interpretation meaning > VT-x or SVM), and a spectrum of things the guest kernel can do if it > desires. >=20 > I'm pretty sure Linux knows all of them. 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