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=-10.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=ham 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 473B6C433E0 for ; Mon, 4 Jan 2021 20:52:40 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B86ED216C4 for ; Mon, 4 Jan 2021 20:52:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B86ED216C4 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.61497.108283 (Exim 4.92) (envelope-from ) id 1kwWpd-0006Lh-75; Mon, 04 Jan 2021 20:52:01 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 61497.108283; Mon, 04 Jan 2021 20:52:01 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kwWpd-0006La-3o; Mon, 04 Jan 2021 20:52:01 +0000 Received: by outflank-mailman (input) for mailman id 61497; Mon, 04 Jan 2021 20:51:59 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kwWpY-0006LV-VC for xen-devel@lists.xenproject.org; Mon, 04 Jan 2021 20:51:59 +0000 Received: from merlin.infradead.org (unknown [2001:8b0:10b:1231::1]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id c2972d39-e153-457e-993b-73b6c98390e5; Mon, 04 Jan 2021 20:51:52 +0000 (UTC) Received: from 54-240-197-236.amazon.com ([54.240.197.236] helo=u3832b3a9db3152.ant.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kwWpI-0007Dy-Jv; Mon, 04 Jan 2021 20:51:40 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: c2972d39-e153-457e-993b-73b6c98390e5 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Mime-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=FNM2T8atrxIInZZBj45qYNScOe0Hd7qgAvQfxWOyU3Y=; b=J/WVSQg6VshsPuMRR3MpZXjpNv eqKGcCmC6TbCTOKywpq8OzYvJdemOsPcLGj/oUc3KBI7bYcikfiWAJhz6P/UIVL4J3XlefkYCgVKP jvOWzymtdkT9TY7dmuC9nO9kAZoXIaAWSBaSOocL13sEM7PxvpSWLXhayOvt6hLLX2sAF1PGvtTtY R68HAymDZbNSvUrBIE7hQjqK8GF4JDdQcPK3J8EH3xgsIcVtjRap8wOgaFIIw64GjQs2YYcw5JbIf k9e7jz+MYwkUvKmr55i5WCDYFc7jB7/OGZxMSVMFnHrNjO2jlH2PLXx2E3a8kc8MNcPab1NpJPqzw pmPk96HA==; Message-ID: <706a569a1321deafb3ae7a4e8d569fb6f2291f50.camel@infradead.org> Subject: Re: [PATCH 5/5] x86/xen: Don't register PV spinlock IPI when it isn't going to be used From: David Woodhouse To: boris.ostrovsky@oracle.com, x86@kernel.org Cc: Stefano Stabellini , Juergen Gross , Paul Durrant , jgrall@amazon.com, karahmed@amazon.de, xen-devel Date: Mon, 04 Jan 2021 20:51:37 +0000 In-Reply-To: References: <20201224115323.3540130-1-dwmw2@infradead.org> <20201224115323.3540130-6-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-uTIIkaivRFMQrR6qkqkr" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html --=-uTIIkaivRFMQrR6qkqkr Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2021-01-04 at 14:06 -0500, boris.ostrovsky@oracle.com wrote: > On 1/4/21 12:32 PM, David Woodhouse wrote: > > On Mon, 2021-01-04 at 12:06 -0500, boris.ostrovsky@oracle.com wrote > > : > > > > @@ -115,7 +115,7 @@ PV_CALLEE_SAVE_REGS_THUNK(xen_vcpu_stolen); > > > > void __init xen_init_spinlocks(void) > > > > { > > > > /* Don't need to use pvqspinlock code if there is only > > > > 1 vCPU. */ > > > > - if (num_possible_cpus() =3D=3D 1 || nopvspin) > > > > + if (num_possible_cpus() =3D=3D 1 || nopvspin || > > > > !xen_have_vector_callback) > > >=20 > > > xen_init_spinlock() will not be called without vector callbacks > > > so > > > this test is not really necessary. > >=20 > > Right, that's just paranoia to make the conditions consistent and > > safe. >=20 >=20 > OK, but we still need to do something about virt_spin_lock_key. Right, I suppose we should just call xen_init_spinlocks() and then my defensive check stops being defensive and does what we need, including fixing virt_spin_lock_key. Normally it's xen_hvm_smp_prepare_boot_cpu() which calls xen_init_spinlocks(), and *also* calls xen_vcpu_setup() for CPU0... which brings me back to your other observation. I think we *should* be calling xen_vcpu_setup() for all CPUs, even when there's no vector callback. We can still have a per-vCPU vcpu_info page if we want it. It was relatively harmless that we didn't do it for CPU0, but it was wrong not to do so. So I think this fixes both. Will test: --- a/arch/x86/xen/smp_hvm.c +++ b/arch/x86/xen/smp_hvm.c @@ -64,6 +64,8 @@ static void xen_hvm_cpu_die(unsigned int cpu) =20 void __init xen_hvm_smp_init(void) { + smp_ops.smp_prepare_boot_cpu =3D xen_hvm_smp_prepare_boot_cpu; + if (!xen_have_vector_callback) return; =20 @@ -72,6 +74,5 @@ void __init xen_hvm_smp_init(void) smp_ops.cpu_die =3D xen_hvm_cpu_die; smp_ops.send_call_func_ipi =3D xen_smp_send_call_function_ipi; smp_ops.send_call_func_single_ipi =3D xen_smp_send_call_function_si= ngle_ipi; - smp_ops.smp_prepare_boot_cpu =3D xen_hvm_smp_prepare_boot_cpu; smp_ops.smp_cpus_done =3D xen_smp_cpus_done; } --=-uTIIkaivRFMQrR6qkqkr Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE 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