Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

Pull virtio updates from Michael Tsirkin:
 "virtio, vhost: features, fixes

   - PCI virtual function support for virtio

   - DMA barriers for virtio strong barriers

   - bugfixes"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  virtio: update the comments for transport features
  virtio_pci: support enabling VFs
  vhost: fix info leak due to uninitialized memory
  virtio_ring: switch to dma_XX barriers for rpmsg

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index ce8c95b..a502f1a 100644 (file)
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -2349,6 +2349,9 @@ struct vhost_msg_node *vhost_new_msg(struct vhost_virtqueue *vq, int type)
        struct vhost_msg_node *node = kmalloc(sizeof *node, GFP_KERNEL);
        if (!node)
                return NULL;
+
+       /* Make sure all padding within the structure is initialized. */
+       memset(&node->msg, 0, sizeof node->msg);
        node->vq = vq;
        node->msg.type = type;
        return node;

diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index b563a44..705aebd 100644 (file)
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -578,6 +578,8 @@ static void virtio_pci_remove(struct pci_dev *pci_dev)
        struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
        struct device *dev = get_device(&vp_dev->vdev.dev);
 
+       pci_disable_sriov(pci_dev);
+
        unregister_virtio_device(&vp_dev->vdev);
 
        if (vp_dev->ioaddr)
@@ -589,6 +591,33 @@ static void virtio_pci_remove(struct pci_dev *pci_dev)
        put_device(dev);
 }
 
+static int virtio_pci_sriov_configure(struct pci_dev *pci_dev, int num_vfs)
+{
+       struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
+       struct virtio_device *vdev = &vp_dev->vdev;
+       int ret;
+
+       if (!(vdev->config->get_status(vdev) & VIRTIO_CONFIG_S_DRIVER_OK))
+               return -EBUSY;
+
+       if (!__virtio_test_bit(vdev, VIRTIO_F_SR_IOV))
+               return -EINVAL;
+
+       if (pci_vfs_assigned(pci_dev))
+               return -EPERM;
+
+       if (num_vfs == 0) {
+               pci_disable_sriov(pci_dev);
+               return 0;
+       }
+
+       ret = pci_enable_sriov(pci_dev, num_vfs);
+       if (ret < 0)
+               return ret;
+
+       return num_vfs;
+}
+
 static struct pci_driver virtio_pci_driver = {
        .name           = "virtio-pci",
        .id_table       = virtio_pci_id_table,
@@ -597,6 +626,7 @@ static struct pci_driver virtio_pci_driver = {
 #ifdef CONFIG_PM_SLEEP
        .driver.pm      = &virtio_pci_pm_ops,
 #endif
+       .sriov_configure = virtio_pci_sriov_configure,
 };
 
 module_pci_driver(virtio_pci_driver);

diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 2555d80..07571da 100644 (file)
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -153,14 +153,28 @@ static u64 vp_get_features(struct virtio_device *vdev)
        return features;
 }
 
+static void vp_transport_features(struct virtio_device *vdev, u64 features)
+{
+       struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+       struct pci_dev *pci_dev = vp_dev->pci_dev;
+
+       if ((features & BIT_ULL(VIRTIO_F_SR_IOV)) &&
+                       pci_find_ext_capability(pci_dev, PCI_EXT_CAP_ID_SRIOV))
+               __virtio_set_bit(vdev, VIRTIO_F_SR_IOV);
+}
+
 /* virtio config->finalize_features() implementation */
 static int vp_finalize_features(struct virtio_device *vdev)
 {
        struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+       u64 features = vdev->features;
 
        /* Give virtio_ring a chance to accept features. */
        vring_transport_features(vdev);
 
+       /* Give virtio_pci a chance to accept features. */
+       vp_transport_features(vdev, features);
+
        if (!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
                dev_err(&vdev->dev, "virtio: device uses modern interface "
                        "but does not have VIRTIO_F_VERSION_1\n");

diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
index bbf3252..fab0213 100644 (file)
--- a/include/linux/virtio_ring.h
+++ b/include/linux/virtio_ring.h
@@ -35,7 +35,7 @@ static inline void virtio_rmb(bool weak_barriers)
        if (weak_barriers)
                virt_rmb();
        else
-               rmb();
+               dma_rmb();
 }
 
 static inline void virtio_wmb(bool weak_barriers)
@@ -43,7 +43,7 @@ static inline void virtio_wmb(bool weak_barriers)
        if (weak_barriers)
                virt_wmb();
        else
-               wmb();
+               dma_wmb();
 }
 
 static inline void virtio_store_mb(bool weak_barriers,

diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h
index 308e209..449132c 100644 (file)
--- a/include/uapi/linux/virtio_config.h
+++ b/include/uapi/linux/virtio_config.h
@@ -45,11 +45,14 @@
 /* We've given up on this device. */
 #define VIRTIO_CONFIG_S_FAILED         0x80
 
-/* Some virtio feature bits (currently bits 28 through 32) are reserved for the
- * transport being used (eg. virtio_ring), the rest are per-device feature
- * bits. */
+/*
+ * Virtio feature bits VIRTIO_TRANSPORT_F_START through
+ * VIRTIO_TRANSPORT_F_END are reserved for the transport
+ * being used (e.g. virtio_ring, virtio_pci etc.), the
+ * rest are per-device feature bits.
+ */
 #define VIRTIO_TRANSPORT_F_START       28
-#define VIRTIO_TRANSPORT_F_END         34
+#define VIRTIO_TRANSPORT_F_END         38
 
 #ifndef VIRTIO_CONFIG_NO_LEGACY
 /* Do we get callbacks when the ring is completely used, even if we've
@@ -71,4 +74,9 @@
  * this is for compatibility with legacy systems.
  */
 #define VIRTIO_F_IOMMU_PLATFORM                33
+
+/*
+ * Does the device support Single Root I/O Virtualization?
+ */
+#define VIRTIO_F_SR_IOV                        37
 #endif /* _UAPI_LINUX_VIRTIO_CONFIG_H */