Merge tag 'vfio-v5.8-rc3' of git://github.com/awilliam/linux-vfio

Pull VFIO fixes from Alex Williamson:

 - Fix double free of eventfd ctx (Alex Williamson)

 - Fix duplicate use of capability ID (Alex Williamson)

 - Fix SR-IOV VF memory enable handling (Alex Williamson)

* tag 'vfio-v5.8-rc3' of git://github.com/awilliam/linux-vfio:
  vfio/pci: Fix SR-IOV VF handling with MMIO blocking
  vfio/type1: Fix migration info capability ID
  vfio/pci: Clear error and request eventfd ctx after releasing

Author: torvalds

drivers/vfio/pci/vfio_pci.c

@@ -521,10 +521,14 @@ static void vfio_pci_release(void *device_data)
 		vfio_pci_vf_token_user_add(vdev, -1);
 		vfio_spapr_pci_eeh_release(vdev->pdev);
 		vfio_pci_disable(vdev);
-		if (vdev->err_trigger)
+		if (vdev->err_trigger) {
 			eventfd_ctx_put(vdev->err_trigger);
-		if (vdev->req_trigger)
+			vdev->err_trigger = NULL;
+		}
+		if (vdev->req_trigger) {
 			eventfd_ctx_put(vdev->req_trigger);
+			vdev->req_trigger = NULL;
+		}
 	}
 
 	mutex_unlock(&vdev->reflck->lock);

drivers/vfio/pci/vfio_pci_config.c

@@ -398,9 +398,15 @@ static inline void p_setd(struct perm_bits *p, int off, u32 virt, u32 write)
 /* Caller should hold memory_lock semaphore */
 bool __vfio_pci_memory_enabled(struct vfio_pci_device *vdev)
 {
+	struct pci_dev *pdev = vdev->pdev;
 	u16 cmd = le16_to_cpu(*(__le16 *)&vdev->vconfig[PCI_COMMAND]);
 
-	return cmd & PCI_COMMAND_MEMORY;
+	/*
+	 * SR-IOV VF memory enable is handled by the MSE bit in the
+	 * PF SR-IOV capability, there's therefore no need to trigger
+	 * faults based on the virtual value.
+	 */
+	return pdev->is_virtfn || (cmd & PCI_COMMAND_MEMORY);
 }
 
 /*
@@ -1728,6 +1734,15 @@ int vfio_config_init(struct vfio_pci_device *vdev)
 				 vconfig[PCI_INTERRUPT_PIN]);
 
 		vconfig[PCI_INTERRUPT_PIN] = 0; /* Gratuitous for good VFs */
+
+		/*
+		 * VFs do no implement the memory enable bit of the COMMAND
+		 * register therefore we'll not have it set in our initial
+		 * copy of config space after pci_enable_device().  For
+		 * consistency with PFs, set the virtual enable bit here.
+		 */
+		*(__le16 *)&vconfig[PCI_COMMAND] |=
+					cpu_to_le16(PCI_COMMAND_MEMORY);
 	}
 
 	if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) || vdev->nointx)

include/uapi/linux/vfio.h

@@ -1030,7 +1030,7 @@ struct vfio_iommu_type1_info_cap_iova_range {
  * size in bytes that can be used by user applications when getting the dirty
  * bitmap.
  */
-#define VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION  1
+#define VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION  2
 
 struct vfio_iommu_type1_info_cap_migration {
 	struct	vfio_info_cap_header header;