From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Williamson Subject: [PATCH v3 3/3] KVM: Use pci_store/load_saved_state() around VM device usage Date: Wed, 20 Apr 2011 14:31:46 -0600 Message-ID: <20110420203146.3189.47203.stgit@s20.home> References: <20110420202523.3189.31306.stgit@s20.home> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: linux-kernel@vger.kernel.org, alex.williamson@redhat.com, jan.kiszka@siemens.com, jbarnes@virtuousgeek.org To: linux-pci@vger.kernel.org, kvm@vger.kernel.org, avi@redhat.com Return-path: In-Reply-To: <20110420202523.3189.31306.stgit@s20.home> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org 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 | 18 ++++++++++++++---- 2 files changed, 15 insertions(+), 4 deletions(-) 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: