From patchwork Thu Nov 28 14:06:54 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cornelia Huck X-Patchwork-Id: 3254391 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 68A06C045B for ; Thu, 28 Nov 2013 14:07:33 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A0BCE20648 for ; Thu, 28 Nov 2013 14:07:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BD15C20532 for ; Thu, 28 Nov 2013 14:07:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758635Ab3K1OHT (ORCPT ); Thu, 28 Nov 2013 09:07:19 -0500 Received: from e06smtp10.uk.ibm.com ([195.75.94.106]:32824 "EHLO e06smtp10.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758960Ab3K1OHP (ORCPT ); Thu, 28 Nov 2013 09:07:15 -0500 Received: from /spool/local by e06smtp10.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Thu, 28 Nov 2013 14:07:11 -0000 Received: from b06cxnps4074.portsmouth.uk.ibm.com (d06relay11.portsmouth.uk.ibm.com [9.149.109.196]) by d06dlp01.portsmouth.uk.ibm.com (Postfix) with ESMTP id 4A1B717D8069; Thu, 28 Nov 2013 14:06:59 +0000 (GMT) Received: from d06av10.portsmouth.uk.ibm.com (d06av10.portsmouth.uk.ibm.com [9.149.37.251]) by b06cxnps4074.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id rASE6wmU64028826; Thu, 28 Nov 2013 14:06:58 GMT Received: from d06av10.portsmouth.uk.ibm.com (localhost [127.0.0.1]) by d06av10.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id rASE794d002844; Thu, 28 Nov 2013 07:07:10 -0700 Received: from gondolin.boeblingen.de.ibm.com (dyn-9-152-224-196.boeblingen.de.ibm.com [9.152.224.196]) by d06av10.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id rASE74st002580; Thu, 28 Nov 2013 07:07:09 -0700 From: Cornelia Huck To: Gleb Natapov , Paolo Bonzini Cc: Christian Borntraeger , kvm@vger.kernel.org, linux-s390@vger.kernel.org, Thomas Huth , stable@vger.kernel.org, Cornelia Huck Subject: [PULL 5/9] KVM: s390: Always store status during SIGP STOP_AND_STORE_STATUS Date: Thu, 28 Nov 2013 15:06:54 +0100 Message-Id: <1385647618-15541-6-git-send-email-cornelia.huck@de.ibm.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1385647618-15541-1-git-send-email-cornelia.huck@de.ibm.com> References: <1385647618-15541-1-git-send-email-cornelia.huck@de.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13112814-4966-0000-0000-000007A6DA5A Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Spam-Status: No, score=-6.9 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 The SIGP order STOP_AND_STORE_STATUS is defined to stop a CPU and store its status. However, we only stored the status if the CPU was still running, so make sure that the status is now also stored if the CPU was already stopped. This fixes the problem that the CPU information was not stored correctly in kdump files, rendering them unreadable. Signed-off-by: Thomas Huth Acked-by: Christian Borntraeger Cc: stable@vger.kernel.org Signed-off-by: Cornelia Huck --- arch/s390/kvm/kvm-s390.c | 25 +++++++++++++++---------- arch/s390/kvm/kvm-s390.h | 4 ++-- arch/s390/kvm/sigp.c | 15 ++++++++++++++- 3 files changed, 31 insertions(+), 13 deletions(-) diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 7f47835..55eb8de 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -873,7 +873,7 @@ static int __guestcopy(struct kvm_vcpu *vcpu, u64 guestdest, void *from, * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit * KVM_S390_STORE_STATUS_PREFIXED: -> prefix */ -int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) +int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr) { unsigned char archmode = 1; int prefix; @@ -891,15 +891,6 @@ int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) } else prefix = 0; - /* - * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy - * copying in vcpu load/put. Lets update our copies before we save - * it into the save area - */ - save_fp_ctl(&vcpu->arch.guest_fpregs.fpc); - save_fp_regs(vcpu->arch.guest_fpregs.fprs); - save_access_regs(vcpu->run->s.regs.acrs); - if (__guestcopy(vcpu, addr + offsetof(struct save_area, fp_regs), vcpu->arch.guest_fpregs.fprs, 128, prefix)) return -EFAULT; @@ -944,6 +935,20 @@ int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) return 0; } +int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) +{ + /* + * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy + * copying in vcpu load/put. Lets update our copies before we save + * it into the save area + */ + save_fp_ctl(&vcpu->arch.guest_fpregs.fpc); + save_fp_regs(vcpu->arch.guest_fpregs.fprs); + save_access_regs(vcpu->run->s.regs.acrs); + + return kvm_s390_store_status_unloaded(vcpu, addr); +} + static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, struct kvm_enable_cap *cap) { diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h index fcd25b4..36f6b18 100644 --- a/arch/s390/kvm/kvm-s390.h +++ b/arch/s390/kvm/kvm-s390.h @@ -145,8 +145,8 @@ int kvm_s390_handle_eb(struct kvm_vcpu *vcpu); int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu); /* implemented in kvm-s390.c */ -int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, - unsigned long addr); +int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr); +int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr); void s390_vcpu_block(struct kvm_vcpu *vcpu); void s390_vcpu_unblock(struct kvm_vcpu *vcpu); void exit_sie(struct kvm_vcpu *vcpu); diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c index bec398c..6805601 100644 --- a/arch/s390/kvm/sigp.c +++ b/arch/s390/kvm/sigp.c @@ -130,6 +130,7 @@ unlock: static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action) { struct kvm_s390_interrupt_info *inti; + int rc = SIGP_CC_ORDER_CODE_ACCEPTED; inti = kzalloc(sizeof(*inti), GFP_ATOMIC); if (!inti) @@ -139,6 +140,8 @@ static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action) spin_lock_bh(&li->lock); if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) { kfree(inti); + if ((action & ACTION_STORE_ON_STOP) != 0) + rc = -ESHUTDOWN; goto out; } list_add_tail(&inti->list, &li->list); @@ -150,7 +153,7 @@ static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action) out: spin_unlock_bh(&li->lock); - return SIGP_CC_ORDER_CODE_ACCEPTED; + return rc; } static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action) @@ -174,6 +177,16 @@ static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action) unlock: spin_unlock(&fi->lock); VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr); + + if ((action & ACTION_STORE_ON_STOP) != 0 && rc == -ESHUTDOWN) { + /* If the CPU has already been stopped, we still have + * to save the status when doing stop-and-store. This + * has to be done after unlocking all spinlocks. */ + struct kvm_vcpu *dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr); + rc = kvm_s390_store_status_unloaded(dst_vcpu, + KVM_S390_STORE_STATUS_NOADDR); + } + return rc; }