From nobody Tue Oct 28 01:55:53 2025 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 (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1523007527870943.6049803717432; Fri, 6 Apr 2018 02:38:47 -0700 (PDT) Received: from localhost ([::1]:39833 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f4NpR-0003pL-Ru for importer@patchew.org; Fri, 06 Apr 2018 05:38:41 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35438) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f4Nmq-0002AJ-Gc for qemu-devel@nongnu.org; Fri, 06 Apr 2018 05:36:01 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1f4Nmn-0004fH-Dh for qemu-devel@nongnu.org; Fri, 06 Apr 2018 05:36:00 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:43504 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1f4Nmn-0004ey-8U; Fri, 06 Apr 2018 05:35:57 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id C05174023150; Fri, 6 Apr 2018 09:35:56 +0000 (UTC) Received: from t460s.redhat.com (ovpn-116-247.ams2.redhat.com [10.36.116.247]) by smtp.corp.redhat.com (Postfix) with ESMTP id 61315AFD6A; Fri, 6 Apr 2018 09:35:53 +0000 (UTC) From: David Hildenbrand To: qemu-s390x@nongnu.org Date: Fri, 6 Apr 2018 11:35:52 +0200 Message-Id: <20180406093552.13016-1-david@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Fri, 06 Apr 2018 09:35:56 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Fri, 06 Apr 2018 09:35:56 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'david@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PATCH v1 for-2.12] s390x/kvm: call cpu_synchronize_state() on every kvm_arch_handle_exit() 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: Thomas Huth , David Hildenbrand , Cornelia Huck , Alexander Graf , qemu-devel@nongnu.org, Christian Borntraeger , 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" Manually having to use cpu_synchronize_state() is error prone. And as Christian Borntraeger discovered, e.g. handle_diag() is currently missing a cpu_synchronize_state(), as decode_basedisp_s() uses a general purpose register value internally. So let's do an overall cpu_synchronize_state(), which fixes at least the one mentioned BUG. We will clean up the superfluous cpu_synchronize_state() calls later. We now also call it (although maybe not neded) for - KVM_EXIT_S390_RESET -> s390_reipl_request() - KVM_EXIT_DEBUG -> kvm_arch_handle_debug_exit() - unmanagable/unimplemented intercepts - ICPT_CPU_STOP -> do_stop_interrupt() -> cpu gets halted - Scenarios where we inject an operation exception - handle_stsi() I don't think any of these are performance critical. Especially as we have all information directly contained in kvm_run, there are no additional IOCTLs to issue on modern kernels. Signed-off-by: David Hildenbrand Acked-by: Christian Borntraeger --- target/s390x/kvm.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c index f570896dc1..fb59d92def 100644 --- a/target/s390x/kvm.c +++ b/target/s390x/kvm.c @@ -1778,6 +1778,8 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run= *run) =20 qemu_mutex_lock_iothread(); =20 + cpu_synchronize_state(cs); + switch (run->exit_reason) { case KVM_EXIT_S390_SIEIC: ret =3D handle_intercept(cpu); --=20 2.14.3