Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752057AbdIMKXD (ORCPT ); Wed, 13 Sep 2017 06:23:03 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:22048 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751631AbdIMKXC (ORCPT ); Wed, 13 Sep 2017 06:23:02 -0400 X-IronPort-AV: E=Sophos;i="5.42,387,1500912000"; d="scan'208";a="26089202" From: Dou Liyang To: , CC: , , , , , , Dou Liyang , , , Juergen Gross Subject: [PATCH v10 10/12] x86/xen: Bypass intr mode setup in enlighten_pv system Date: Wed, 13 Sep 2017 18:22:35 +0800 Message-ID: <1505298155-20262-1-git-send-email-douly.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1505293975-26005-11-git-send-email-douly.fnst@cn.fujitsu.com> References: <1505293975-26005-11-git-send-email-douly.fnst@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.167.226.106] X-yoursite-MailScanner-ID: 12F7747278EA.A1B29 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: douly.fnst@cn.fujitsu.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1482 Lines: 42 XEN PV overrides smp_prepare_cpus(). xen_pv_smp_prepare_cpus() initializes interrupts in the XEN PV specific way and does not invoke native_smp_prepare_cpus(). As a consequence, x86_init.intr_mode_init() is not invoked either. The invocation of x86_init.intr_mode_init() will be moved from native_smp_prepare_cpus() in a follow up patch to solve the dump-capture kernel hangs, if there is a notsc option in its command line. That move would cause the invocation of x86_init.intr_mode_init() for XEN PV platforms. To prevent that, override the default x86_init.intr_mode_init() callback with a noop(). [Rewritten by Thomas Gleixner ] Signed-off-by: Dou Liyang Acked-by: Juergen Gross Cc: xen-devel@lists.xenproject.org Cc: boris.ostrovsky@oracle.com Cc: Juergen Gross --- V10 --> V9: --Modify the changelog, suggested by Juergen arch/x86/xen/enlighten_pv.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index ae2a2e2..934dc7f 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -1232,6 +1232,7 @@ asmlinkage __visible void __init xen_start_kernel(void) x86_platform.get_nmi_reason = xen_get_nmi_reason; x86_init.resources.memory_setup = xen_memory_setup; + x86_init.irqs.intr_mode_init = x86_init_noop; x86_init.oem.arch_setup = xen_arch_setup; x86_init.oem.banner = xen_banner; -- 2.5.5