From patchwork Wed Dec 11 18:57:47 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cornelia Huck X-Patchwork-Id: 3327651 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 21FAFC0D4A for ; Wed, 11 Dec 2013 18:58:16 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4C3D5207CD for ; Wed, 11 Dec 2013 18:58:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2F24A2054C for ; Wed, 11 Dec 2013 18:58:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751746Ab3LKS6I (ORCPT ); Wed, 11 Dec 2013 13:58:08 -0500 Received: from e06smtp13.uk.ibm.com ([195.75.94.109]:39524 "EHLO e06smtp13.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751688Ab3LKS6G (ORCPT ); Wed, 11 Dec 2013 13:58:06 -0500 Received: from /spool/local by e06smtp13.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Wed, 11 Dec 2013 18:58:03 -0000 Received: from b06cxnps4075.portsmouth.uk.ibm.com (d06relay12.portsmouth.uk.ibm.com [9.149.109.197]) by d06dlp02.portsmouth.uk.ibm.com (Postfix) with ESMTP id 8D6A52190023; Wed, 11 Dec 2013 18:58:02 +0000 (GMT) Received: from d06av03.portsmouth.uk.ibm.com (d06av03.portsmouth.uk.ibm.com [9.149.37.213]) by b06cxnps4075.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id rBBIvoCf65601574; Wed, 11 Dec 2013 18:57:50 GMT Received: from d06av03.portsmouth.uk.ibm.com (localhost [127.0.0.1]) by d06av03.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id rBBIw1Jc015499; Wed, 11 Dec 2013 11:58:02 -0700 Received: from gondolin.boeblingen.de.ibm.com (dyn-9-152-224-196.boeblingen.de.ibm.com [9.152.224.196]) by d06av03.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id rBBIvsnw015326; Wed, 11 Dec 2013 11:58:01 -0700 From: Cornelia Huck To: Gleb Natapov , Paolo Bonzini Cc: Christian Borntraeger , kvm@vger.kernel.org, linux-s390@vger.kernel.org, Thomas Huth , Cornelia Huck Subject: [PULL 4/6] KVM: s390: Reworked SIGP RESTART order Date: Wed, 11 Dec 2013 19:57:47 +0100 Message-Id: <1386788269-20249-5-git-send-email-cornelia.huck@de.ibm.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1386788269-20249-1-git-send-email-cornelia.huck@de.ibm.com> References: <1386788269-20249-1-git-send-email-cornelia.huck@de.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13121118-2966-0000-0000-000009A7B7AD Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Thomas Huth When SIGP RESTART detected an illegal CPU address, there is no need to drop to userspace, we can return CC3 to the guest directly instead. Also renamed __sigp_restart() to sigp_check_callable() (since this is a better description of what the function is really doing) and moved a string specific to RESTART to the calling place instead, so that this function gets usable by other SIGP orders, too. Signed-off-by: Thomas Huth Reviewed-by: Cornelia Huck Signed-off-by: Cornelia Huck --- arch/s390/kvm/sigp.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c index eee1402..509547d 100644 --- a/arch/s390/kvm/sigp.c +++ b/arch/s390/kvm/sigp.c @@ -363,7 +363,8 @@ static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr, return rc; } -static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr) +/* Test whether the destination CPU is available and not busy */ +static int sigp_check_callable(struct kvm_vcpu *vcpu, u16 cpu_addr) { struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; struct kvm_s390_local_interrupt *li; @@ -382,9 +383,6 @@ static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr) spin_lock_bh(&li->lock); if (li->action_bits & ACTION_STOP_ON_STOP) rc = SIGP_CC_BUSY; - else - VCPU_EVENT(vcpu, 4, "sigp restart %x to handle userspace", - cpu_addr); spin_unlock_bh(&li->lock); out: spin_unlock(&fi->lock); @@ -459,10 +457,15 @@ int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu) break; case SIGP_RESTART: vcpu->stat.instruction_sigp_restart++; - rc = __sigp_restart(vcpu, cpu_addr); - if (rc == SIGP_CC_BUSY) - break; - /* user space must know about restart */ + rc = sigp_check_callable(vcpu, cpu_addr); + if (rc == SIGP_CC_ORDER_CODE_ACCEPTED) { + VCPU_EVENT(vcpu, 4, + "sigp restart %x to handle userspace", + cpu_addr); + /* user space must know about restart */ + rc = -EOPNOTSUPP; + } + break; default: return -EOPNOTSUPP; }