From patchwork Thu Mar 12 14:20:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miroslav Benes X-Patchwork-Id: 11434475 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9D4186CA for ; Thu, 12 Mar 2020 14:50:40 +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 8354720674 for ; Thu, 12 Mar 2020 14:50:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8354720674 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1jCP9a-0000ZT-QA; Thu, 12 Mar 2020 14:49:42 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1jCOh6-0006Xs-RC for xen-devel@lists.xenproject.org; Thu, 12 Mar 2020 14:20:16 +0000 X-Inumbo-ID: 94cb597a-646c-11ea-b19e-12813bfff9fa Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 94cb597a-646c-11ea-b19e-12813bfff9fa; Thu, 12 Mar 2020 14:20:10 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id A1AEAB2F8; Thu, 12 Mar 2020 14:20:09 +0000 (UTC) From: Miroslav Benes To: boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, jpoimboe@redhat.com Date: Thu, 12 Mar 2020 15:20:05 +0100 Message-Id: <20200312142007.11488-1-mbenes@suse.cz> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Mailman-Approved-At: Thu, 12 Mar 2020 14:49:40 +0000 Subject: [Xen-devel] [PATCH 0/2] x86/xen: Make idle tasks reliable X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: x86@kernel.org, linux-kernel@vger.kernel.org, live-patching@vger.kernel.org, xen-devel@lists.xenproject.org, Miroslav Benes , jslaby@suse.cz Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" The unwinder reports idle tasks' stack on XEN PV as unreliable which complicates things for at least live patching. The two patches in the series try to amend that by using similar approach as non-XEN x86 does. However, I did not come up with a nice solution for secondary CPUs idle tasks. The patch just shows the idea what should be done but it is an ugly hack. Ideas are more than welcome. Miroslav Benes (2): x86/xen: Make the boot CPU idle task reliable x86/xen: Make the secondary CPU idle tasks reliable arch/x86/xen/smp_pv.c | 3 ++- arch/x86/xen/xen-head.S | 14 +++++++++++++- 2 files changed, 15 insertions(+), 2 deletions(-)