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=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 2A6DBC433DB for ; Wed, 20 Jan 2021 02:40:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DECC2230FE for ; Wed, 20 Jan 2021 02:40:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728651AbhATCkI (ORCPT ); Tue, 19 Jan 2021 21:40:08 -0500 Received: from mail.kernel.org ([198.145.29.99]:47420 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730003AbhATB2R (ORCPT ); Tue, 19 Jan 2021 20:28:17 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id D81AE2333B; Wed, 20 Jan 2021 01:26:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1611105995; bh=sJhGEme1dz39LpSWoym7b5fWuUSGevs/wVnlhT0c6HE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mGQbE9eT+fbHSkrZwwq5IO2W3H/FeRVKvijaKLY7j7Ov67RFYWl6M3IkugULiaZxw pXmhwJ5whdwp5a4LLxs5UFv09iJeQw/2iD97WGK/I/aAu2Z9B2S+56SMWoEpdsQnTe lUNxwRKXzTSDGA79JFt+oF1Xt6APzTpONsZuy1N/aSWn8NaxgYI+MJ24OMv8HzAzT3 zrDO/YIpCb3IO9WQb64IEHtOhUp3zp9hclyxDELXZrw0W7ElHRYAA8zL6Jcbgwqs9q J1CZV9occKup+9982ekd7/pBeLOdHNzT0Z0bu1nu5LMfXt5LTloWNm+vXVtLl/itVi Q7wUkNS151mTQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: David Woodhouse , Boris Ostrovsky , Juergen Gross , Sasha Levin , linux-doc@vger.kernel.org, xen-devel@lists.xenproject.org Subject: [PATCH AUTOSEL 5.10 25/45] x86/xen: Add xen_no_vector_callback option to test PCI INTX delivery Date: Tue, 19 Jan 2021 20:25:42 -0500 Message-Id: <20210120012602.769683-25-sashal@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210120012602.769683-1-sashal@kernel.org> References: <20210120012602.769683-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: David Woodhouse [ Upstream commit b36b0fe96af13460278bf9b173beced1bd15f85d ] 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 Link: https://lore.kernel.org/r/20210106153958.584169-4-dwmw2@infradead.org Signed-off-by: Juergen Gross Signed-off-by: Sasha Levin --- 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/Documentation/admin-guide/kernel-parameters.txt index f6a1513dfb76c..26bfe7ae711b8 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5965,6 +5965,10 @@ This option is obsoleted by the "nopv" option, which has equivalent effect for XEN platform. + xen_no_vector_callback + [KNL,X86,XEN] Disable the vector callback for Xen + event channel interrupts. + xen_scrub_pages= [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 9e87ab010c82b..ec50b7423a4c8 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; } +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) xen_panic_handler_init(); - if (xen_feature(XENFEAT_hvm_callback_vector)) + if (!no_vector_callback && xen_feature(XENFEAT_hvm_callback_vector)) xen_have_vector_callback = 1; xen_hvm_smp_init(); @@ -233,6 +235,13 @@ static __init int xen_parse_nopv(char *arg) } early_param("xen_nopv", xen_parse_nopv); +static __init int xen_parse_no_vector_callback(char *arg) +{ + no_vector_callback = 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()) -- 2.27.0