linux-kernel - [PATCH v3 1/1] virtio_bt: Fix alignment in configuration struct

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Date:   Tue, 18 Oct 2022 21:19:11 +0200
From:   Igor Skalkin <Igor.Skalkin@...nsynergy.com>
To:     virtualization@...ts.linux-foundation.org, luiz.dentz@...il.com,
        mst@...hat.com
Cc:     marcel@...tmann.org, johan.hedberg@...il.com, jasowang@...hat.com,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        Igor Skalkin <Igor.Skalkin@...nsynergy.com>
Subject: [PATCH v3 1/1] virtio_bt: Fix alignment in configuration struct

The current version of the configuration structure has unaligned
16-bit fields, but according to the specification [1], access to
the configuration space must be aligned.

Add a second, aligned  version of the configuration structure
and a new feature bit indicating that this version is being used.

[1] https://docs.oasis-open.org/virtio/virtio/v1.1/virtio-v1.1.pdf

Signed-off-by: Igor Skalkin <Igor.Skalkin@...nsynergy.com>
---
 drivers/bluetooth/virtio_bt.c  | 16 +++++++++++++---
 include/uapi/linux/virtio_bt.h |  8 ++++++++
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/bluetooth/virtio_bt.c b/drivers/bluetooth/virtio_bt.c
index 67c21263f9e0..35f8041722c8 100644
--- a/drivers/bluetooth/virtio_bt.c
+++ b/drivers/bluetooth/virtio_bt.c
@@ -306,7 +306,12 @@ static int virtbt_probe(struct virtio_device *vdev)
        if (virtio_has_feature(vdev, VIRTIO_BT_F_VND_HCI)) {
                __u16 vendor;

-               virtio_cread(vdev, struct virtio_bt_config, vendor, &vendor);
+               if (virtio_has_feature(vdev, VIRTIO_BT_F_CONFIG_V2))
+                       virtio_cread(vdev, struct virtio_bt_config_v2,
+                                    vendor, &vendor);
+               else
+                       virtio_cread(vdev, struct virtio_bt_config,
+                                    vendor, &vendor);

                switch (vendor) {
                case VIRTIO_BT_CONFIG_VENDOR_ZEPHYR:
@@ -339,8 +344,12 @@ static int virtbt_probe(struct virtio_device *vdev)
        if (virtio_has_feature(vdev, VIRTIO_BT_F_MSFT_EXT)) {
                __u16 msft_opcode;

-               virtio_cread(vdev, struct virtio_bt_config,
-                            msft_opcode, &msft_opcode);
+               if (virtio_has_feature(vdev, VIRTIO_BT_F_CONFIG_V2))
+                       virtio_cread(vdev, struct virtio_bt_config_v2,
+                                    msft_opcode, &msft_opcode);
+               else
+                       virtio_cread(vdev, struct virtio_bt_config,
+                                    msft_opcode, &msft_opcode);

                hci_set_msft_opcode(hdev, msft_opcode);
        }
@@ -387,6 +396,7 @@ static const unsigned int virtbt_features[] = {
        VIRTIO_BT_F_VND_HCI,
        VIRTIO_BT_F_MSFT_EXT,
        VIRTIO_BT_F_AOSP_EXT,
+       VIRTIO_BT_F_CONFIG_V2,
 };

 static struct virtio_driver virtbt_driver = {
diff --git a/include/uapi/linux/virtio_bt.h b/include/uapi/linux/virtio_bt.h
index a7bd48daa9a9..af798f4c9680 100644
--- a/include/uapi/linux/virtio_bt.h
+++ b/include/uapi/linux/virtio_bt.h
@@ -9,6 +9,7 @@
 #define VIRTIO_BT_F_VND_HCI    0       /* Indicates vendor command support */
 #define VIRTIO_BT_F_MSFT_EXT   1       /* Indicates MSFT vendor support */
 #define VIRTIO_BT_F_AOSP_EXT   2       /* Indicates AOSP vendor support */
+#define VIRTIO_BT_F_CONFIG_V2  3       /* Use second version configuration */

 enum virtio_bt_config_type {
        VIRTIO_BT_CONFIG_TYPE_PRIMARY   = 0,
@@ -28,4 +29,11 @@ struct virtio_bt_config {
        __u16 msft_opcode;
 } __attribute__((packed));

+struct virtio_bt_config_v2 {
+       __u8  type;
+       __u8  alignment;
+       __u16 vendor;
+       __u16 msft_opcode;
+};
+
 #endif /* _UAPI_LINUX_VIRTIO_BT_H */
--
2.37.2


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