From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Kirsher Subject: [net-next 1/8] pci: Add flag indicating device has been assigned by KVM Date: Wed, 21 Sep 2011 03:12:47 -0700 Message-ID: <1316599974-23205-2-git-send-email-jeffrey.t.kirsher@intel.com> References: <1316599974-23205-1-git-send-email-jeffrey.t.kirsher@intel.com> Cc: Greg Rose , netdev@vger.kernel.org, gospo@redhat.com, Jeff Kirsher To: davem@davemloft.net Return-path: Received: from mga09.intel.com ([134.134.136.24]:18266 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752882Ab1IUKM6 (ORCPT ); Wed, 21 Sep 2011 06:12:58 -0400 In-Reply-To: <1316599974-23205-1-git-send-email-jeffrey.t.kirsher@intel.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Greg Rose Device drivers that create and destroy SR-IOV virtual functions via calls to pci_enable_sriov() and pci_disable_sriov can cause catastrophic failures if they attempt to destroy VFs while they are assigned to guest virtual machines. By adding a flag for use by the KVM module to indicate that a device is assigned a device driver can check that flag and avoid destroying VFs while they are assigned and avoid system failures. Signed-off-by: Greg Rose Signed-off-by: Jeff Kirsher --- include/linux/pci.h | 2 ++ virt/kvm/assigned-dev.c | 2 ++ virt/kvm/iommu.c | 4 ++++ 3 files changed, 8 insertions(+), 0 deletions(-) diff --git a/include/linux/pci.h b/include/linux/pci.h index f27893b..4f511da 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -174,6 +174,8 @@ enum pci_dev_flags { PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG = (__force pci_dev_flags_t) 1, /* Device configuration is irrevocably lost if disabled into D3 */ PCI_DEV_FLAGS_NO_D3 = (__force pci_dev_flags_t) 2, + /* Provide indication device is assigned by KVM */ + PCI_DEV_FLAGS_ASSIGNED = (__force pci_dev_flags_t) 4, }; enum pci_irq_reroute_variant { diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c index 4e9eaeb..eaf3a50 100644 --- a/virt/kvm/assigned-dev.c +++ b/virt/kvm/assigned-dev.c @@ -205,6 +205,8 @@ static void kvm_free_assigned_device(struct kvm *kvm, else pci_restore_state(assigned_dev->dev); + assigned_dev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED; + pci_release_regions(assigned_dev->dev); pci_disable_device(assigned_dev->dev); pci_dev_put(assigned_dev->dev); diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c index 78c80f6..967aba1 100644 --- a/virt/kvm/iommu.c +++ b/virt/kvm/iommu.c @@ -187,6 +187,8 @@ int kvm_assign_device(struct kvm *kvm, goto out_unmap; } + pdev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED; + printk(KERN_DEBUG "assign device %x:%x:%x.%x\n", assigned_dev->host_segnr, assigned_dev->host_busnr, @@ -215,6 +217,8 @@ int kvm_deassign_device(struct kvm *kvm, iommu_detach_device(domain, &pdev->dev); + pdev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED; + printk(KERN_DEBUG "deassign device %x:%x:%x.%x\n", assigned_dev->host_segnr, assigned_dev->host_busnr, -- 1.7.6.2