From nobody Tue Feb 10 04:29:52 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (208.118.235.17 [208.118.235.17]) by mx.zohomail.com with SMTPS id 1510852442175218.26624688421361; Thu, 16 Nov 2017 09:14:02 -0800 (PST) Received: from localhost ([::1]:42044 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eFNjP-0007jk-DM for importer@patchew.org; Thu, 16 Nov 2017 12:13:39 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48428) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eFNbe-00021P-QY for qemu-devel@nongnu.org; Thu, 16 Nov 2017 12:05:42 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eFNbe-00018K-0K for qemu-devel@nongnu.org; Thu, 16 Nov 2017 12:05:38 -0500 Received: from mx1.redhat.com ([209.132.183.28]:60110) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eFNbd-000186-QZ; Thu, 16 Nov 2017 12:05:37 -0500 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D9D7262E82; Thu, 16 Nov 2017 17:05:36 +0000 (UTC) Received: from t460s.redhat.com (ovpn-116-22.ams2.redhat.com [10.36.116.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id CF2DA60BE7; Thu, 16 Nov 2017 17:05:34 +0000 (UTC) From: David Hildenbrand To: qemu-s390x@nongnu.org, qemu-devel@nongnu.org Date: Thu, 16 Nov 2017 18:05:26 +0100 Message-Id: <20171116170526.12643-4-david@redhat.com> In-Reply-To: <20171116170526.12643-1-david@redhat.com> References: <20171116170526.12643-1-david@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Thu, 16 Nov 2017 17:05:37 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v1 for-2.11 3/3] s390x/tcg: fix DIAG 308 with > 1 VCPU (MTTCG) X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Christian Borntraeger , Cornelia Huck , David Hildenbrand , Alexander Graf , Richard Henderson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Currently, multi threaded TCG with > 1 VCPU gets stuck during IPL, when the bios tries to switch to the loaded kernel via DIAG 308. As run_on_cpu() is used, we run into a deadlock after handling the reset. We need the iolock (just like KVM). Signed-off-by: David Hildenbrand Reviewed-by: Thomas Huth --- target/s390x/misc_helper.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/target/s390x/misc_helper.c b/target/s390x/misc_helper.c index 4afd90b969..d272851e1c 100644 --- a/target/s390x/misc_helper.c +++ b/target/s390x/misc_helper.c @@ -103,7 +103,9 @@ void HELPER(diag)(CPUS390XState *env, uint32_t r1, uint= 32_t r3, uint32_t num) break; case 0x308: /* ipl */ + qemu_mutex_lock_iothread(); handle_diag_308(env, r1, r3); + qemu_mutex_unlock_iothread(); r =3D 0; break; case 0x288: --=20 2.13.6