From patchwork Wed Apr 20 20:31:46 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Williamson X-Patchwork-Id: 723061 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p3KKWAJY024703 for ; Wed, 20 Apr 2011 20:32:10 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756242Ab1DTUbu (ORCPT ); Wed, 20 Apr 2011 16:31:50 -0400 Received: from mx1.redhat.com ([209.132.183.28]:15683 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756192Ab1DTUbs (ORCPT ); Wed, 20 Apr 2011 16:31:48 -0400 Received: from int-mx12.intmail.prod.int.phx2.redhat.com (int-mx12.intmail.prod.int.phx2.redhat.com [10.5.11.25]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id p3KKVlm4027014 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Wed, 20 Apr 2011 16:31:47 -0400 Received: from s20.home (ovpn01.gateway.prod.ext.phx2.redhat.com [10.5.9.1]) by int-mx12.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id p3KKVk7B001963; Wed, 20 Apr 2011 16:31:46 -0400 From: Alex Williamson Subject: [PATCH v3 3/3] KVM: Use pci_store/load_saved_state() around VM device usage To: linux-pci@vger.kernel.org, kvm@vger.kernel.org, avi@redhat.com Cc: linux-kernel@vger.kernel.org, alex.williamson@redhat.com, jan.kiszka@siemens.com, jbarnes@virtuousgeek.org Date: Wed, 20 Apr 2011 14:31:46 -0600 Message-ID: <20110420203146.3189.47203.stgit@s20.home> In-Reply-To: <20110420202523.3189.31306.stgit@s20.home> References: <20110420202523.3189.31306.stgit@s20.home> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.25 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Wed, 20 Apr 2011 20:32:10 +0000 (UTC) Store the device saved state so that we can reload the device back to the original state when it's unassigned. This has the benefit that the state survives across pci_reset_function() calls via the PCI sysfs reset interface while the VM is using the device. Signed-off-by: Alex Williamson Acked-by: Avi Kivity --- include/linux/kvm_host.h | 1 + virt/kvm/assigned-dev.c | 18 ++++++++++++++---- 2 files changed, 15 insertions(+), 4 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index ab42855..9272db0 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -513,6 +513,7 @@ struct kvm_assigned_dev_kernel { struct kvm *kvm; spinlock_t intx_lock; char irq_name[32]; + struct pci_saved_state *pci_saved_state; }; struct kvm_irq_mask_notifier { diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c index ae72ae6..6cc4b97 100644 --- a/virt/kvm/assigned-dev.c +++ b/virt/kvm/assigned-dev.c @@ -197,8 +197,13 @@ static void kvm_free_assigned_device(struct kvm *kvm, { kvm_free_assigned_irq(kvm, assigned_dev); - __pci_reset_function(assigned_dev->dev); - pci_restore_state(assigned_dev->dev); + pci_reset_function(assigned_dev->dev); + if (pci_load_and_free_saved_state(assigned_dev->dev, + &assigned_dev->pci_saved_state)) + printk(KERN_INFO "%s: Couldn't reload %s saved state\n", + __func__, dev_name(&assigned_dev->dev->dev)); + else + pci_restore_state(assigned_dev->dev); pci_release_regions(assigned_dev->dev); pci_disable_device(assigned_dev->dev); @@ -516,7 +521,10 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm, pci_reset_function(dev); pci_save_state(dev); - + match->pci_saved_state = pci_store_saved_state(dev); + if (!match->pci_saved_state) + printk(KERN_DEBUG "%s: Couldn't store %s saved state\n", + __func__, dev_name(&dev->dev)); match->assigned_dev_id = assigned_dev->assigned_dev_id; match->host_segnr = assigned_dev->segnr; match->host_busnr = assigned_dev->busnr; @@ -546,7 +554,9 @@ out: mutex_unlock(&kvm->lock); return r; out_list_del: - pci_restore_state(dev); + if (pci_load_and_free_saved_state(dev, &match->pci_saved_state)) + printk(KERN_INFO "%s: Couldn't reload %s saved state\n", + __func__, dev_name(&dev->dev)); list_del(&match->list); pci_release_regions(dev); out_disable: