From nobody Tue Feb 10 09:10:49 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org ARC-Seal: i=1; a=rsa-sha256; t=1609947697; cv=none; d=zohomail.com; s=zohoarc; b=Po+p+nI1xXRVIX4bhab4ZKYlm8bktjQ7+YL3BrY1U7/f8+poUzVCsbIHfZEHvGtVfbeW+osbTFJWzt+V6qo+3+Vi9viUMdccgsdIoGb515LeNP4fGgQszSBtNN/mLiAFQSs7zvM75zpeQLqBTt0NNUgX7I+RJIzSPArDPCKjNl0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1609947697; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=iPl2ZcADguCjOv6wHi6QBQ2DaTPWIxyJ5TOhjLQ8ves=; b=Jq1nxtngLNxLH3lSaSJrvR+4NB8IGcDVX36N7wE/t/DeV9k4R3nYMvJ22R+Eg2gsvVbvGhDkXcMsOgao/ED2tFBdAvjTxVpcSwn+d1nQpfOk0GlQI88/MpELXzadnJKJDOBUGSy02jg0b174ML39sgL4KCjS4xhpBEBu/fgXODU= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1609947697323211.1764078144961; Wed, 6 Jan 2021 07:41:37 -0800 (PST) Received: from list by lists.xenproject.org with outflank-mailman.62550.110869 (Exim 4.92) (envelope-from ) id 1kxAw6-0005I0-Mz; Wed, 06 Jan 2021 15:41:22 +0000 Received: by outflank-mailman (output) from mailman id 62550.110869; Wed, 06 Jan 2021 15:41:22 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kxAw6-0005Hs-Id; Wed, 06 Jan 2021 15:41:22 +0000 Received: by outflank-mailman (input) for mailman id 62550; Wed, 06 Jan 2021 15:41:21 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kxAw5-00058z-OM for xen-devel@lists.xenproject.org; Wed, 06 Jan 2021 15:41:21 +0000 Received: from casper.infradead.org (unknown [2001:8b0:10b:1236::1]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id d510cba0-6bf2-4ab4-af5b-07dd295665d2; Wed, 06 Jan 2021 15:41:14 +0000 (UTC) Received: from i7.infradead.org ([2001:8b0:10b:1:21e:67ff:fecb:7a92]) by casper.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1kxAun-002TH0-UR; Wed, 06 Jan 2021 15:40:12 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1kxAul-002S20-Uh; Wed, 06 Jan 2021 15:39:59 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version 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 X-Inumbo-ID: d510cba0-6bf2-4ab4-af5b-07dd295665d2 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=iPl2ZcADguCjOv6wHi6QBQ2DaTPWIxyJ5TOhjLQ8ves=; b=hgW0DxIP1EJ+gUEwiRRn80t/Op B5WUiBD8v7ugaIQz02itFZ+AvNDzBGrkPCIZJZN100+jzVVi/fxNv5+xgQgbBydh11Z3iT6uGrRJl P+5VTjTIBAaF9KPJvtQp41n4kPuImkV3vWZZwKqlAaMZ4sZuzJrbd7BH5c2FhIPYMbEulfaUks/Fn ngrrrzRUDnQYloilY/IkOw7HN3obFCML5/a5r+OCIIEJ9nfRjiyCzDpoqhrTiQwpH0WPYK64i3G9D m/EZTCfAIHCvchgcr+pHj3BVoAyv/pS9sDuHtnGjwpk4YAJU5wQqKK67uOl19SrryNCf6FFHzzeOz EONYQRRA==; From: David Woodhouse To: x86@kernel.org Cc: Stefano Stabellini , Boris Ostrovsky , Juergen Gross , Paul Durrant , jgrall@amazon.com, karahmed@amazon.de, xen-devel Subject: [PATCH v3 3/5] x86/xen: Add xen_no_vector_callback option to test PCI INTX delivery Date: Wed, 6 Jan 2021 15:39:56 +0000 Message-Id: <20210106153958.584169-4-dwmw2@infradead.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210106153958.584169-1-dwmw2@infradead.org> References: <20210106153958.584169-1-dwmw2@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: David Woodhouse X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-ZohoMail-DKIM: pass (identity @infradead.org) Content-Type: text/plain; charset="utf-8" From: David Woodhouse It's useful to be able to test non-vector event channel delivery, to make sure Linux will work properly on older Xen which doesn't have it. It's also useful for those working on Xen and Xen-compatible hypervisors, because there are guest kernels still in active use which use PCI INTX even when vector delivery is available. Signed-off-by: David Woodhouse Reviewed-by: Boris Ostrovsky --- Documentation/admin-guide/kernel-parameters.txt | 4 ++++ arch/x86/xen/enlighten_hvm.c | 11 ++++++++++- 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentatio= n/admin-guide/kernel-parameters.txt index c722ec19cd00..8b9289b27844 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5972,6 +5972,10 @@ This option is obsoleted by the "nopv" option, which has equivalent effect for XEN platform. =20 + xen_no_vector_callback + [KNL,X86,XEN] Disable the vector callback for Xen + event channel interrupts. + xen_scrub_pages=3D [XEN] Boolean option to control scrubbing pages before giving them back to Xen, for use by other domains. Can be also changed at runtime diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c index 9e87ab010c82..ec50b7423a4c 100644 --- a/arch/x86/xen/enlighten_hvm.c +++ b/arch/x86/xen/enlighten_hvm.c @@ -188,6 +188,8 @@ static int xen_cpu_dead_hvm(unsigned int cpu) return 0; } =20 +static bool no_vector_callback __initdata; + static void __init xen_hvm_guest_init(void) { if (xen_pv_domain()) @@ -207,7 +209,7 @@ static void __init xen_hvm_guest_init(void) =20 xen_panic_handler_init(); =20 - if (xen_feature(XENFEAT_hvm_callback_vector)) + if (!no_vector_callback && xen_feature(XENFEAT_hvm_callback_vector)) xen_have_vector_callback =3D 1; =20 xen_hvm_smp_init(); @@ -233,6 +235,13 @@ static __init int xen_parse_nopv(char *arg) } early_param("xen_nopv", xen_parse_nopv); =20 +static __init int xen_parse_no_vector_callback(char *arg) +{ + no_vector_callback =3D true; + return 0; +} +early_param("xen_no_vector_callback", xen_parse_no_vector_callback); + bool __init xen_hvm_need_lapic(void) { if (xen_pv_domain()) --=20 2.29.2