[PATCH vfio 01/11] virtio-pci: Use virtio pci device layer vq info instead of generic one

Yishai Hadas
Thu, 21 Sep 2023 12:40:30 -0000

Currently VQ deletion callback vp_del_vqs() processes generic
virtio_device level VQ list instead of VQ information available at PCI
layer.

To adhere to the layering, use the pci device level VQ information
stored in the virtqueues or vqs.

This also prepares the code to handle PCI layer admin vq life cycle to
be managed within the pci layer and thereby avoid undesired deletion of
admin vq by upper layer drivers (net, console, vfio), in the del_vqs()
callback.

Signed-off-by: Feng Liu <feliu at nvidia.com>
Reviewed-by: Parav Pandit <parav at nvidia.com>
Reviewed-by: Jiri Pirko <jiri at nvidia.com>
Signed-off-by: Yishai Hadas <yishaih at nvidia.com>
---
 drivers/virtio/virtio_pci_common.c | 12 +++++++++---
 drivers/virtio/virtio_pci_common.h |  1 +
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/virtio/virtio_pci_common.c
b/drivers/virtio/virtio_pci_common.c
index c2524a7207cf..7a3e6edc4dd6 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -232,12 +232,16 @@ static void vp_del_vq(struct virtqueue *vq)
 void vp_del_vqs(struct virtio_device *vdev)
 {
 	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
-	struct virtqueue *vq, *n;
+	struct virtqueue *vq;
 	int i;

-	list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
+	for (i = 0; i < vp_dev->nvqs; i++) {
+		if (!vp_dev->vqs[i])
+			continue;
+
+		vq = vp_dev->vqs[i]->vq;
 		if (vp_dev->per_vq_vectors) {
-			int v = vp_dev->vqs[vq->index]->msix_vector;
+			int v = vp_dev->vqs[i]->msix_vector;

 			if (v != VIRTIO_MSI_NO_VECTOR) {
 				int irq = pci_irq_vector(vp_dev->pci_dev, v);
@@ -294,6 +298,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev,
unsigned int nvqs,
 	vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);
 	if (!vp_dev->vqs)
 		return -ENOMEM;
+	vp_dev->nvqs = nvqs;

 	if (per_vq_vectors) {
 		/* Best option: one for change interrupt, one per vq. */
@@ -365,6 +370,7 @@ static int vp_find_vqs_intx(struct virtio_device *vdev,
unsigned int nvqs,
 	vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);
 	if (!vp_dev->vqs)
 		return -ENOMEM;
+	vp_dev->nvqs = nvqs;

 	err = request_irq(vp_dev->pci_dev->irq, vp_interrupt, IRQF_SHARED,
 			dev_name(&vdev->dev), vp_dev);
diff --git a/drivers/virtio/virtio_pci_common.h
b/drivers/virtio/virtio_pci_common.h
index 4b773bd7c58c..602021967aaa 100644
--- a/drivers/virtio/virtio_pci_common.h
+++ b/drivers/virtio/virtio_pci_common.h
@@ -60,6 +60,7 @@ struct virtio_pci_device {

 	/* array of all queues for house-keeping */
 	struct virtio_pci_vq_info **vqs;
+	u32 nvqs;

 	/* MSI-X support */
 	int msix_enabled;
--
2.27.0