From patchwork Tue Apr 19 20:12:17 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Williamson X-Patchwork-Id: 718991 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 p3JKCkUV017728 for ; Tue, 19 Apr 2011 20:12:48 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754232Ab1DSUMZ (ORCPT ); Tue, 19 Apr 2011 16:12:25 -0400 Received: from mx1.redhat.com ([209.132.183.28]:18147 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751979Ab1DSUMU (ORCPT ); Tue, 19 Apr 2011 16:12:20 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id p3JKCIMv009159 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 19 Apr 2011 16:12:18 -0400 Received: from s20.home (ovpn01.gateway.prod.ext.phx2.redhat.com [10.5.9.1]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id p3JKCHYr032328; Tue, 19 Apr 2011 16:12:18 -0400 From: Alex Williamson Subject: [PATCH v2 2/2] KVM: Use pci_store/load_saved_state() around VM device usage To: linux-pci@vger.kernel.org, kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, alex.williamson@redhat.com, jan.kiszka@siemens.com, avi@redhat.com, jbarnes@virtuousgeek.org Date: Tue, 19 Apr 2011 14:12:17 -0600 Message-ID: <20110419201217.3739.66570.stgit@s20.home> In-Reply-To: <20110419200912.3739.22895.stgit@s20.home> References: <20110419200912.3739.22895.stgit@s20.home> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 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]); Tue, 19 Apr 2011 20:12:48 +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 --- include/linux/kvm_host.h | 1 + virt/kvm/assigned-dev.c | 8 +++++--- 2 files changed, 6 insertions(+), 3 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..7099b67 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_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..66c6ccd 100644 --- a/virt/kvm/assigned-dev.c +++ b/virt/kvm/assigned-dev.c @@ -197,7 +197,9 @@ static void kvm_free_assigned_device(struct kvm *kvm, { kvm_free_assigned_irq(kvm, assigned_dev); - __pci_reset_function(assigned_dev->dev); + pci_reset_function(assigned_dev->dev); + pci_load_and_free_saved_state(assigned_dev->dev, + &assigned_dev->pci_saved_state); pci_restore_state(assigned_dev->dev); pci_release_regions(assigned_dev->dev); @@ -516,7 +518,7 @@ 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); match->assigned_dev_id = assigned_dev->assigned_dev_id; match->host_segnr = assigned_dev->segnr; match->host_busnr = assigned_dev->busnr; @@ -546,7 +548,7 @@ out: mutex_unlock(&kvm->lock); return r; out_list_del: - pci_restore_state(dev); + pci_load_and_free_saved_state(dev, &match->pci_saved_state); list_del(&match->list); pci_release_regions(dev); out_disable: