Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus

* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
  virtio: Add transport feature handling stub for virtio_ring.
  virtio: Rename set_features to finalize_features
  virtio: Formally reserve bits 28-31 to be 'transport' features.
  s390: use virtio_console for KVM on s390
  virtio: console as a config option
  virtio_console: use virtqueue notification for hvc_console
  hvc_console: rework setup to replace irq functions with callbacks
  virtio_blk: check for hardsector size from host
  virtio: Use bus_type probe and remove methods
  virtio: don't always force a notification when ring is full
  virtio: clarify that ABI is usable by any implementations
  virtio: Recycle unused recv buffer pages for large skbs in net driver
  virtio net: Allow receiving SG packets
  virtio net: Add ethtool ops for SG/GSO
  virtio: fix virtio_net xmit of freed skb bug

28 files changed, 385 insertions, 124 deletions

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index eb530b4128ba..2ed88122be93 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -565,6 +565,7 @@ bool "s390 guest support (EXPERIMENTAL)"
         depends on 64BIT && EXPERIMENTAL
         select VIRTIO
         select VIRTIO_RING
+        select VIRTIO_CONSOLE
         help
           Select this option if you want to run the kernel under s390 linux
 endmenu
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index b358e18273b0..62122bad1e33 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -54,6 +54,7 @@
 #include <asm/sections.h>
 #include <asm/ebcdic.h>
 #include <asm/compat.h>
+#include <asm/kvm_virtio.h>
 
 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
@@ -766,7 +767,8 @@ setup_arch(char **cmdline_p)
                 printk("We are running under VM (64 bit mode)\n");
         else if (MACHINE_IS_KVM) {
                 printk("We are running under KVM (64 bit mode)\n");
-                add_preferred_console("ttyS", 1, NULL);
+                add_preferred_console("hvc", 0, NULL);
+                s390_virtio_console_init();
         } else
                 printk("We are running native (64 bit mode)\n");
 #endif /* CONFIG_64BIT */
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index dd7ea203f940..42251095134f 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -196,6 +196,7 @@ static int virtblk_probe(struct virtio_device *vdev)
         int err;
         u64 cap;
         u32 v;
+        u32 blk_size;
 
         if (index_to_minor(index) >= 1 << MINORBITS)
                 return -ENOSPC;
@@ -290,6 +291,13 @@ static int virtblk_probe(struct virtio_device *vdev)
         if (!err)
                 blk_queue_max_hw_segments(vblk->disk->queue, v);
 
+        /* Host can optionally specify the block size of the device */
+        err = virtio_config_val(vdev, VIRTIO_BLK_F_BLK_SIZE,
+                                offsetof(struct virtio_blk_config, blk_size),
+                                &blk_size);
+        if (!err)
+                blk_queue_hardsect_size(vblk->disk->queue, blk_size);
+
         add_disk(vblk->disk);
         return 0;
 
@@ -330,7 +338,7 @@ static struct virtio_device_id id_table[] = {
 
 static unsigned int features[] = {
         VIRTIO_BLK_F_BARRIER, VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX,
-        VIRTIO_BLK_F_GEOMETRY, VIRTIO_BLK_F_RO,
+        VIRTIO_BLK_F_GEOMETRY, VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
 };
 
 static struct virtio_driver virtio_blk = {
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 67b07576f8bf..6c070dc5f2d4 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -578,11 +578,14 @@ config HVC_DRIVER
           It will automatically be selected if one of the back-end console drivers
           is selected.
 
+config HVC_IRQ
+        bool
 
 config HVC_CONSOLE
         bool "pSeries Hypervisor Virtual Console support"
         depends on PPC_PSERIES
         select HVC_DRIVER
+        select HVC_IRQ
         help
           pSeries machines when partitioned support a hypervisor virtual
           console. This driver allows each pSeries partition to have a console
@@ -593,6 +596,7 @@ config HVC_ISERIES
         depends on PPC_ISERIES
         default y
         select HVC_DRIVER
+        select HVC_IRQ
         help
           iSeries machines support a hypervisor virtual console.
 
@@ -614,13 +618,18 @@ config HVC_XEN
         bool "Xen Hypervisor Console support"
         depends on XEN
         select HVC_DRIVER
+        select HVC_IRQ
         default y
         help
           Xen virtual console device driver
 
 config VIRTIO_CONSOLE
-        bool
+        tristate "Virtio console"
+        depends on VIRTIO
         select HVC_DRIVER
+        help
+          Virtio console for use with lguest and other hypervisors.
+
 
 config HVCS
         tristate "IBM Hypervisor Virtual Console Server support"
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 4b6e736cfa02..eb02c3506800 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_HVC_ISERIES)	+= hvc_iseries.o
 obj-$(CONFIG_HVC_RTAS)          += hvc_rtas.o
 obj-$(CONFIG_HVC_BEAT)          += hvc_beat.o
 obj-$(CONFIG_HVC_DRIVER)        += hvc_console.o
+obj-$(CONFIG_HVC_IRQ)           += hvc_irq.o
 obj-$(CONFIG_HVC_XEN)           += hvc_xen.o
 obj-$(CONFIG_VIRTIO_CONSOLE)    += virtio_console.o
 obj-$(CONFIG_RAW_DRIVER)        += raw.o
diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
index 2f9759d625cc..02aac104842d 100644
--- a/drivers/char/hvc_console.c
+++ b/drivers/char/hvc_console.c
@@ -27,7 +27,6 @@
 #include <linux/init.h>
 #include <linux/kbd_kern.h>
 #include <linux/kernel.h>
-#include <linux/kref.h>
 #include <linux/kthread.h>
 #include <linux/list.h>
 #include <linux/module.h>
@@ -75,23 +74,6 @@ static int hvc_init(void);
 static int sysrq_pressed;
 #endif
 
-struct hvc_struct {
-        spinlock_t lock;
-        int index;
-        struct tty_struct *tty;
-        unsigned int count;
-        int do_wakeup;
-        char *outbuf;
-        int outbuf_size;
-        int n_outbuf;
-        uint32_t vtermno;
-        struct hv_ops *ops;
-        int irq_requested;
-        int irq;
-        struct list_head next;
-        struct kref kref; /* ref count & hvc_struct lifetime */
-};
-
 /* dynamic list of hvc_struct instances */
 static LIST_HEAD(hvc_structs);
 
@@ -298,27 +280,15 @@ int hvc_instantiate(uint32_t vtermno, int index, struct hv_ops *ops)
 
         return 0;
 }
+EXPORT_SYMBOL_GPL(hvc_instantiate);
 
 /* Wake the sleeping khvcd */
-static void hvc_kick(void)
+void hvc_kick(void)
 {
         hvc_kicked = 1;
         wake_up_process(hvc_task);
 }
-
-static int hvc_poll(struct hvc_struct *hp);
-
-/*
- * NOTE: This API isn't used if the console adapter doesn't support interrupts.
- * In this case the console is poll driven.
- */
-static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance)
-{
-        /* if hvc_poll request a repoll, then kick the hvcd thread */
-        if (hvc_poll(dev_instance))
-                hvc_kick();
-        return IRQ_HANDLED;
-}
+EXPORT_SYMBOL_GPL(hvc_kick);
 
 static void hvc_unthrottle(struct tty_struct *tty)
 {
@@ -333,7 +303,6 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
 {
         struct hvc_struct *hp;
         unsigned long flags;
-        int irq = 0;
         int rc = 0;
 
         /* Auto increments kref reference if found. */
@@ -352,18 +321,15 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
         tty->low_latency = 1; /* Makes flushes to ldisc synchronous. */
 
         hp->tty = tty;
-        /* Save for request_irq outside of spin_lock. */
-        irq = hp->irq;
-        if (irq)
-                hp->irq_requested = 1;
+
+        if (hp->ops->notifier_add)
+                rc = hp->ops->notifier_add(hp, hp->data);
 
         spin_unlock_irqrestore(&hp->lock, flags);
-        /* check error, fallback to non-irq */
-        if (irq)
-                rc = request_irq(irq, hvc_handle_interrupt, IRQF_DISABLED, "hvc_console", hp);
+
 
         /*
-         * If the request_irq() fails and we return an error.  The tty layer
+         * If the notifier fails we return an error.  The tty layer
          * will call hvc_close() after a failed open but we don't want to clean
          * up there so we'll clean up here and clear out the previously set
          * tty fields and return the kref reference.
@@ -371,7 +337,6 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
         if (rc) {
                 spin_lock_irqsave(&hp->lock, flags);
                 hp->tty = NULL;
-                hp->irq_requested = 0;
                 spin_unlock_irqrestore(&hp->lock, flags);
                 tty->driver_data = NULL;
                 kref_put(&hp->kref, destroy_hvc_struct);
@@ -386,7 +351,6 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
 static void hvc_close(struct tty_struct *tty, struct file * filp)
 {
         struct hvc_struct *hp;
-        int irq = 0;
         unsigned long flags;
 
         if (tty_hung_up_p(filp))
@@ -404,9 +368,8 @@ static void hvc_close(struct tty_struct *tty, struct file * filp)
         spin_lock_irqsave(&hp->lock, flags);
 
         if (--hp->count == 0) {
-                if (hp->irq_requested)
-                        irq = hp->irq;
-                hp->irq_requested = 0;
+                if (hp->ops->notifier_del)
+                        hp->ops->notifier_del(hp, hp->data);
 
                 /* We are done with the tty pointer now. */
                 hp->tty = NULL;
@@ -418,10 +381,6 @@ static void hvc_close(struct tty_struct *tty, struct file * filp)
                  * waking periodically to check chars_in_buffer().
                  */
                 tty_wait_until_sent(tty, HVC_CLOSE_WAIT);
-
-                if (irq)
-                        free_irq(irq, hp);
-
         } else {
                 if (hp->count < 0)
                         printk(KERN_ERR "hvc_close %X: oops, count is %d\n",
@@ -436,7 +395,6 @@ static void hvc_hangup(struct tty_struct *tty)
 {
         struct hvc_struct *hp = tty->driver_data;
         unsigned long flags;
-        int irq = 0;
         int temp_open_count;
 
         if (!hp)
@@ -458,13 +416,12 @@ static void hvc_hangup(struct tty_struct *tty)
         hp->count = 0;
         hp->n_outbuf = 0;
         hp->tty = NULL;
-        if (hp->irq_requested)
-                /* Saved for use outside of spin_lock. */
-                irq = hp->irq;
-        hp->irq_requested = 0;
+
+        if (hp->ops->notifier_del)
+                        hp->ops->notifier_del(hp, hp->data);
+
         spin_unlock_irqrestore(&hp->lock, flags);
-        if (irq)
-                free_irq(irq, hp);
+
         while(temp_open_count) {
                 --temp_open_count;
                 kref_put(&hp->kref, destroy_hvc_struct);
@@ -575,7 +532,7 @@ static u32 timeout = MIN_TIMEOUT;
 #define HVC_POLL_READ   0x00000001
 #define HVC_POLL_WRITE  0x00000002
 
-static int hvc_poll(struct hvc_struct *hp)
+int hvc_poll(struct hvc_struct *hp)
 {
         struct tty_struct *tty;
         int i, n, poll_mask = 0;
@@ -602,10 +559,10 @@ static int hvc_poll(struct hvc_struct *hp)
         if (test_bit(TTY_THROTTLED, &tty->flags))
                 goto throttled;
 
-        /* If we aren't interrupt driven and aren't throttled, we always
+        /* If we aren't notifier driven and aren't throttled, we always
          * request a reschedule
          */
-        if (hp->irq == 0)
+        if (!hp->irq_requested)
                 poll_mask |= HVC_POLL_READ;
 
         /* Read data if any */
@@ -674,6 +631,7 @@ static int hvc_poll(struct hvc_struct *hp)
 
         return poll_mask;
 }
+EXPORT_SYMBOL_GPL(hvc_poll);
 
 /*
  * This kthread is either polling or interrupt driven.  This is determined by
@@ -733,7 +691,7 @@ static const struct tty_operations hvc_ops = {
         .chars_in_buffer = hvc_chars_in_buffer,
 };
 
-struct hvc_struct __devinit *hvc_alloc(uint32_t vtermno, int irq,
+struct hvc_struct __devinit *hvc_alloc(uint32_t vtermno, int data,
                                         struct hv_ops *ops, int outbuf_size)
 {
         struct hvc_struct *hp;
@@ -754,7 +712,7 @@ struct hvc_struct __devinit *hvc_alloc(uint32_t vtermno, int irq,
         memset(hp, 0x00, sizeof(*hp));
 
         hp->vtermno = vtermno;
-        hp->irq = irq;
+        hp->data = data;
         hp->ops = ops;
         hp->outbuf_size = outbuf_size;
         hp->outbuf = &((char *)hp)[ALIGN(sizeof(*hp), sizeof(long))];
@@ -784,6 +742,7 @@ struct hvc_struct __devinit *hvc_alloc(uint32_t vtermno, int irq,
 
         return hp;
 }
+EXPORT_SYMBOL_GPL(hvc_alloc);
 
 int __devexit hvc_remove(struct hvc_struct *hp)
 {
diff --git a/drivers/char/hvc_console.h b/drivers/char/hvc_console.h
index 42ffb17e15df..d9ce10915625 100644
--- a/drivers/char/hvc_console.h
+++ b/drivers/char/hvc_console.h
@@ -26,6 +26,7 @@
 
 #ifndef HVC_CONSOLE_H
 #define HVC_CONSOLE_H
+#include <linux/kref.h>
 
 /*
  * This is the max number of console adapters that can/will be found as
@@ -42,24 +43,50 @@
  */
 #define HVC_ALLOC_TTY_ADAPTERS  8
 
+struct hvc_struct {
+        spinlock_t lock;
+        int index;
+        struct tty_struct *tty;
+        unsigned int count;
+        int do_wakeup;
+        char *outbuf;
+        int outbuf_size;
+        int n_outbuf;
+        uint32_t vtermno;
+        struct hv_ops *ops;
+        int irq_requested;
+        int data;
+        struct list_head next;
+        struct kref kref; /* ref count & hvc_struct lifetime */
+};
 
 /* implemented by a low level driver */
 struct hv_ops {
         int (*get_chars)(uint32_t vtermno, char *buf, int count);
         int (*put_chars)(uint32_t vtermno, const char *buf, int count);
-};
 
-struct hvc_struct;
+        /* Callbacks for notification. Called in open and close */
+        int (*notifier_add)(struct hvc_struct *hp, int irq);
+        void (*notifier_del)(struct hvc_struct *hp, int irq);
+};
 
 /* Register a vterm and a slot index for use as a console (console_init) */
 extern int hvc_instantiate(uint32_t vtermno, int index, struct hv_ops *ops);
 
 /* register a vterm for hvc tty operation (module_init or hotplug add) */
-extern struct hvc_struct * __devinit hvc_alloc(uint32_t vtermno, int irq,
+extern struct hvc_struct * __devinit hvc_alloc(uint32_t vtermno, int data,
                                 struct hv_ops *ops, int outbuf_size);
-/* remove a vterm from hvc tty operation (modele_exit or hotplug remove) */
+/* remove a vterm from hvc tty operation (module_exit or hotplug remove) */
 extern int __devexit hvc_remove(struct hvc_struct *hp);
 
+/* data available */
+int hvc_poll(struct hvc_struct *hp);
+void hvc_kick(void);
+
+/* default notifier for irq based notification */
+extern int notifier_add_irq(struct hvc_struct *hp, int data);
+extern void notifier_del_irq(struct hvc_struct *hp, int data);
+
 
 #if defined(CONFIG_XMON) && defined(CONFIG_SMP)
 #include <asm/xmon.h>
diff --git a/drivers/char/hvc_irq.c b/drivers/char/hvc_irq.c
new file mode 100644
index 000000000000..73a59cdb8947
--- /dev/null
+++ b/drivers/char/hvc_irq.c
@@ -0,0 +1,44 @@
+/*
+ * Copyright IBM Corp. 2001,2008
+ *
+ * This file contains the IRQ specific code for hvc_console
+ *
+ */
+
+#include <linux/interrupt.h>
+
+#include "hvc_console.h"
+
+static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance)
+{
+        /* if hvc_poll request a repoll, then kick the hvcd thread */
+        if (hvc_poll(dev_instance))
+                hvc_kick();
+        return IRQ_HANDLED;
+}
+
+/*
+ * For IRQ based systems these callbacks can be used
+ */
+int notifier_add_irq(struct hvc_struct *hp, int irq)
+{
+        int rc;
+
+        if (!irq) {
+                hp->irq_requested = 0;
+                return 0;
+        }
+        rc = request_irq(irq, hvc_handle_interrupt, IRQF_DISABLED,
+                           "hvc_console", hp);
+        if (!rc)
+                hp->irq_requested = 1;
+        return rc;
+}
+
+void notifier_del_irq(struct hvc_struct *hp, int irq)
+{
+        if (!irq)
+                return;
+        free_irq(irq, hp);
+        hp->irq_requested = 0;
+}
diff --git a/drivers/char/hvc_iseries.c b/drivers/char/hvc_iseries.c
index a08f8f981c11..b71c610fe5ae 100644
--- a/drivers/char/hvc_iseries.c
+++ b/drivers/char/hvc_iseries.c
@@ -200,6 +200,8 @@ done:
 static struct hv_ops hvc_get_put_ops = {
         .get_chars = get_chars,
         .put_chars = put_chars,
+        .notifier_add = notifier_add_irq,
+        .notifier_del = notifier_del_irq,
 };
 
 static int __devinit hvc_vio_probe(struct vio_dev *vdev,
diff --git a/drivers/char/hvc_vio.c b/drivers/char/hvc_vio.c
index 79711aa4b41d..93f3840c1682 100644
--- a/drivers/char/hvc_vio.c
+++ b/drivers/char/hvc_vio.c
@@ -80,6 +80,8 @@ static int filtered_get_chars(uint32_t vtermno, char *buf, int count)
 static struct hv_ops hvc_get_put_ops = {
         .get_chars = filtered_get_chars,
         .put_chars = hvc_put_chars,
+        .notifier_add = notifier_add_irq,
+        .notifier_del = notifier_del_irq,
 };
 
 static int __devinit hvc_vio_probe(struct vio_dev *vdev,
diff --git a/drivers/char/hvc_xen.c b/drivers/char/hvc_xen.c
index db2ae4216279..6b70aa66a587 100644
--- a/drivers/char/hvc_xen.c
+++ b/drivers/char/hvc_xen.c
@@ -100,6 +100,8 @@ static int read_console(uint32_t vtermno, char *buf, int len)
 static struct hv_ops hvc_ops = {
         .get_chars = read_console,
         .put_chars = write_console,
+        .notifier_add = notifier_add_irq,
+        .notifier_del = notifier_del_irq,
 };
 
 static int __init xen_init(void)
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index dc17fe3a88bc..d0f4eb6fdb7f 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -46,6 +46,9 @@ static char *in, *inbuf;
 /* The operations for our console. */
 static struct hv_ops virtio_cons;
 
+/* The hvc device */
+static struct hvc_struct *hvc;
+
 /*D:310 The put_chars() callback is pretty straightforward.
  *
  * We turn the characters into a scatter-gather list, add it to the output
@@ -134,6 +137,27 @@ int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int))
         return hvc_instantiate(0, 0, &virtio_cons);
 }
 
+/*
+ * we support only one console, the hvc struct is a global var
+ * There is no need to do anything
+ */
+static int notifier_add_vio(struct hvc_struct *hp, int data)
+{
+        hp->irq_requested = 1;
+        return 0;
+}
+
+static void notifier_del_vio(struct hvc_struct *hp, int data)
+{
+        hp->irq_requested = 0;
+}
+
+static void hvc_handle_input(struct virtqueue *vq)
+{
+        if (hvc_poll(hvc))
+                hvc_kick();
+}
+
 /*D:370 Once we're further in boot, we get probed like any other virtio device.
  * At this stage we set up the output virtqueue.
  *
@@ -144,7 +168,6 @@ int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int))
 static int __devinit virtcons_probe(struct virtio_device *dev)
 {
         int err;
-        struct hvc_struct *hvc;
 
         vdev = dev;
 
@@ -158,7 +181,7 @@ static int __devinit virtcons_probe(struct virtio_device *dev)
         /* Find the input queue. */
         /* FIXME: This is why we want to wean off hvc: we do nothing
          * when input comes in. */
-        in_vq = vdev->config->find_vq(vdev, 0, NULL);
+        in_vq = vdev->config->find_vq(vdev, 0, hvc_handle_input);
         if (IS_ERR(in_vq)) {
                 err = PTR_ERR(in_vq);
                 goto free;
@@ -173,15 +196,18 @@ static int __devinit virtcons_probe(struct virtio_device *dev)
         /* Start using the new console output. */
         virtio_cons.get_chars = get_chars;
         virtio_cons.put_chars = put_chars;
+        virtio_cons.notifier_add = notifier_add_vio;
+        virtio_cons.notifier_del = notifier_del_vio;
 
         /* The first argument of hvc_alloc() is the virtual console number, so
-         * we use zero.  The second argument is the interrupt number; we
-         * currently leave this as zero: it would be better not to use the
-         * hvc mechanism and fix this (FIXME!).
+         * we use zero.  The second argument is the parameter for the
+         * notification mechanism (like irq number). We currently leave this
+         * as zero, virtqueues have implicit notifications.
          *
          * The third argument is a "struct hv_ops" containing the put_chars()
-         * and get_chars() pointers.  The final argument is the output buffer
-         * size: we can do any size, so we put PAGE_SIZE here. */
+         * get_chars(), notifier_add() and notifier_del() pointers.
+         * The final argument is the output buffer size: we can do any size,
+         * so we put PAGE_SIZE here. */
         hvc = hvc_alloc(0, 0, &virtio_cons, PAGE_SIZE);
         if (IS_ERR(hvc)) {
                 err = PTR_ERR(hvc);
diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
index 1a8de57289eb..37344aaee22f 100644
--- a/drivers/lguest/lguest_device.c
+++ b/drivers/lguest/lguest_device.c
@@ -98,16 +98,20 @@ static u32 lg_get_features(struct virtio_device *vdev)
         return features;
 }
 
-static void lg_set_features(struct virtio_device *vdev, u32 features)
+static void lg_finalize_features(struct virtio_device *vdev)
 {
-        unsigned int i;
+        unsigned int i, bits;
         struct lguest_device_desc *desc = to_lgdev(vdev)->desc;
         /* Second half of bitmap is features we accept. */
         u8 *out_features = lg_features(desc) + desc->feature_len;
 
+        /* Give virtio_ring a chance to accept features. */
+        vring_transport_features(vdev);
+
         memset(out_features, 0, desc->feature_len);
-        for (i = 0; i < min(desc->feature_len * 8, 32); i++) {
-                if (features & (1 << i))
+        bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8;
+        for (i = 0; i < bits; i++) {
+                if (test_bit(i, vdev->features))
                         out_features[i / 8] |= (1 << (i % 8));
         }
 }
@@ -297,7 +301,7 @@ static void lg_del_vq(struct virtqueue *vq)
 /* The ops structure which hooks everything together. */
 static struct virtio_config_ops lguest_config_ops = {
         .get_features = lg_get_features,
-        .set_features = lg_set_features,
+        .finalize_features = lg_finalize_features,
         .get = lg_get,
         .set = lg_set,
         .get_status = lg_get_status,
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index c28d7cb2035b..0196a0df9021 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -19,6 +19,7 @@
 //#define DEBUG
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
+#include <linux/ethtool.h>
 #include <linux/module.h>
 #include <linux/virtio.h>
 #include <linux/virtio_net.h>
@@ -54,9 +55,15 @@ struct virtnet_info
         struct tasklet_struct tasklet;
         bool free_in_tasklet;
 
+        /* I like... big packets and I cannot lie! */
+        bool big_packets;
+
         /* Receive & send queues. */
         struct sk_buff_head recv;
         struct sk_buff_head send;
+
+        /* Chain pages by the private ptr. */
+        struct page *pages;
 };
 
 static inline struct virtio_net_hdr *skb_vnet_hdr(struct sk_buff *skb)
@@ -69,6 +76,23 @@ static inline void vnet_hdr_to_sg(struct scatterlist *sg, struct sk_buff *skb)
         sg_init_one(sg, skb_vnet_hdr(skb), sizeof(struct virtio_net_hdr));
 }
 
+static void give_a_page(struct virtnet_info *vi, struct page *page)
+{
+        page->private = (unsigned long)vi->pages;
+        vi->pages = page;
+}
+
+static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
+{
+        struct page *p = vi->pages;
+
+        if (p)
+                vi->pages = (struct page *)p->private;
+        else
+                p = alloc_page(gfp_mask);
+        return p;
+}
+
 static void skb_xmit_done(struct virtqueue *svq)
 {
         struct virtnet_info *vi = svq->vdev->priv;
@@ -88,6 +112,7 @@ static void receive_skb(struct net_device *dev, struct sk_buff *skb,
                         unsigned len)
 {
         struct virtio_net_hdr *hdr = skb_vnet_hdr(skb);
+        int err;
 
         if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
                 pr_debug("%s: short packet %i\n", dev->name, len);
@@ -95,10 +120,23 @@ static void receive_skb(struct net_device *dev, struct sk_buff *skb,
                 goto drop;
         }
         len -= sizeof(struct virtio_net_hdr);
-        BUG_ON(len > MAX_PACKET_LEN);
 
-        skb_trim(skb, len);
+        if (len <= MAX_PACKET_LEN) {
+                unsigned int i;
 
+                for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
+                        give_a_page(dev->priv, skb_shinfo(skb)->frags[i].page);
+                skb->data_len = 0;
+                skb_shinfo(skb)->nr_frags = 0;
+        }
+
+        err = pskb_trim(skb, len);
+        if (err) {
+                pr_debug("%s: pskb_trim failed %i %d\n", dev->name, len, err);
+                dev->stats.rx_dropped++;
+                goto drop;
+        }
+        skb->truesize += skb->data_len;
         dev->stats.rx_bytes += skb->len;
         dev->stats.rx_packets++;
 
@@ -160,7 +198,7 @@ static void try_fill_recv(struct virtnet_info *vi)
 {
         struct sk_buff *skb;
         struct scatterlist sg[2+MAX_SKB_FRAGS];
-        int num, err;
+        int num, err, i;
 
         sg_init_table(sg, 2+MAX_SKB_FRAGS);
         for (;;) {
@@ -170,6 +208,24 @@ static void try_fill_recv(struct virtnet_info *vi)
 
                 skb_put(skb, MAX_PACKET_LEN);
                 vnet_hdr_to_sg(sg, skb);
+
+                if (vi->big_packets) {
+                        for (i = 0; i < MAX_SKB_FRAGS; i++) {
+                                skb_frag_t *f = &skb_shinfo(skb)->frags[i];
+                                f->page = get_a_page(vi, GFP_ATOMIC);
+                                if (!f->page)
+                                        break;
+
+                                f->page_offset = 0;
+                                f->size = PAGE_SIZE;
+
+                                skb->data_len += PAGE_SIZE;
+                                skb->len += PAGE_SIZE;
+
+                                skb_shinfo(skb)->nr_frags++;
+                        }
+                }
+
                 num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
                 skb_queue_head(&vi->recv, skb);
 
@@ -335,16 +391,11 @@ again:
         free_old_xmit_skbs(vi);
 
         /* If we has a buffer left over from last time, send it now. */
-        if (unlikely(vi->last_xmit_skb)) {
-                if (xmit_skb(vi, vi->last_xmit_skb) != 0) {
-                        /* Drop this skb: we only queue one. */
-                        vi->dev->stats.tx_dropped++;
-                        kfree_skb(skb);
-                        skb = NULL;
-                        goto stop_queue;
-                }
-                vi->last_xmit_skb = NULL;
-        }
+        if (unlikely(vi->last_xmit_skb) &&
+            xmit_skb(vi, vi->last_xmit_skb) != 0)
+                goto stop_queue;
+
+        vi->last_xmit_skb = NULL;
 
         /* Put new one in send queue and do transmit */
         if (likely(skb)) {
@@ -370,6 +421,11 @@ stop_queue:
                 netif_start_queue(dev);
                 goto again;
         }
+        if (skb) {
+                /* Drop this skb: we only queue one. */
+                vi->dev->stats.tx_dropped++;
+                kfree_skb(skb);
+        }
         goto done;
 }
 
@@ -408,6 +464,22 @@ static int virtnet_close(struct net_device *dev)
         return 0;
 }
 
+static int virtnet_set_tx_csum(struct net_device *dev, u32 data)
+{
+        struct virtnet_info *vi = netdev_priv(dev);
+        struct virtio_device *vdev = vi->vdev;
+
+        if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM))
+                return -ENOSYS;
+
+        return ethtool_op_set_tx_hw_csum(dev, data);
+}
+
+static struct ethtool_ops virtnet_ethtool_ops = {
+        .set_tx_csum = virtnet_set_tx_csum,
+        .set_sg = ethtool_op_set_sg,
+};
+
 static int virtnet_probe(struct virtio_device *vdev)
 {
         int err;
@@ -427,6 +499,7 @@ static int virtnet_probe(struct virtio_device *vdev)
 #ifdef CONFIG_NET_POLL_CONTROLLER
         dev->poll_controller = virtnet_netpoll;
 #endif
+        SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
         SET_NETDEV_DEV(dev, &vdev->dev);
 
         /* Do we support "hardware" checksums? */
@@ -462,11 +535,18 @@ static int virtnet_probe(struct virtio_device *vdev)
         vi->dev = dev;
         vi->vdev = vdev;
         vdev->priv = vi;
+        vi->pages = NULL;
 
         /* If they give us a callback when all buffers are done, we don't need
          * the timer. */
         vi->free_in_tasklet = virtio_has_feature(vdev,VIRTIO_F_NOTIFY_ON_EMPTY);
 
+        /* If we can receive ANY GSO packets, we must allocate large ones. */
+        if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4)
+            || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)
+            || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
+                vi->big_packets = true;
+
         /* We expect two virtqueues, receive then send. */
         vi->rvq = vdev->config->find_vq(vdev, 0, skb_recv_done);
         if (IS_ERR(vi->rvq)) {
@@ -541,6 +621,10 @@ static void virtnet_remove(struct virtio_device *vdev)
         vdev->config->del_vq(vi->svq);
         vdev->config->del_vq(vi->rvq);
         unregister_netdev(vi->dev);
+
+        while (vi->pages)
+                __free_pages(get_a_page(vi, GFP_KERNEL), 0);
+
         free_netdev(vi->dev);
 }
 
@@ -553,7 +637,9 @@ static unsigned int features[] = {
         VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
         VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
         VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
-        VIRTIO_NET_F_HOST_ECN, VIRTIO_F_NOTIFY_ON_EMPTY,
+        VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
+        VIRTIO_NET_F_GUEST_ECN, /* We don't yet handle UFO input. */
+        VIRTIO_F_NOTIFY_ON_EMPTY,
 };
 
 static struct virtio_driver virtio_net = {
diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index 5ab34340919b..79954bd6bfa5 100644
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -15,6 +15,7 @@
 #include <linux/err.h>
 #include <linux/virtio.h>
 #include <linux/virtio_config.h>
+#include <linux/virtio_console.h>
 #include <linux/interrupt.h>
 #include <linux/virtio_ring.h>
 #include <linux/pfn.h>
@@ -87,16 +88,20 @@ static u32 kvm_get_features(struct virtio_device *vdev)
         return features;
 }
 
-static void kvm_set_features(struct virtio_device *vdev, u32 features)
+static void kvm_finalize_features(struct virtio_device *vdev)
 {
-        unsigned int i;
+        unsigned int i, bits;
         struct kvm_device_desc *desc = to_kvmdev(vdev)->desc;
         /* Second half of bitmap is features we accept. */
         u8 *out_features = kvm_vq_features(desc) + desc->feature_len;
 
+        /* Give virtio_ring a chance to accept features. */
+        vring_transport_features(vdev);
+
         memset(out_features, 0, desc->feature_len);
-        for (i = 0; i < min(desc->feature_len * 8, 32); i++) {
-                if (features & (1 << i))
+        bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8;
+        for (i = 0; i < bits; i++) {
+                if (test_bit(i, vdev->features))
                         out_features[i / 8] |= (1 << (i % 8));
         }
 }
@@ -222,7 +227,7 @@ static void kvm_del_vq(struct virtqueue *vq)
  */
 static struct virtio_config_ops kvm_vq_configspace_ops = {
         .get_features = kvm_get_features,
-        .set_features = kvm_set_features,
+        .finalize_features = kvm_finalize_features,
         .get = kvm_get,
         .set = kvm_set,
         .get_status = kvm_get_status,
@@ -333,6 +338,25 @@ static int __init kvm_devices_init(void)
         return 0;
 }
 
+/* code for early console output with virtio_console */
+static __init int early_put_chars(u32 vtermno, const char *buf, int count)
+{
+        char scratch[17];
+        unsigned int len = count;
+
+        if (len > sizeof(scratch) - 1)
+                len = sizeof(scratch) - 1;
+        scratch[len] = '\0';
+        memcpy(scratch, buf, len);
+        kvm_hypercall1(KVM_S390_VIRTIO_NOTIFY, __pa(scratch));
+        return len;
+}
+
+void s390_virtio_console_init(void)
+{
+        virtio_cons_early_init(early_put_chars);
+}
+
 /*
  * We do this after core stuff, but before the drivers.
  */
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index 7084e7e146c0..5b78fd0aff0a 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -71,13 +71,6 @@ static int virtio_uevent(struct device *_dv, struct kobj_uevent_env *env)
                               dev->id.device, dev->id.vendor);
 }
 
-static struct bus_type virtio_bus = {
-        .name  = "virtio",
-        .match = virtio_dev_match,
-        .dev_attrs = virtio_dev_attrs,
-        .uevent = virtio_uevent,
-};
-
 static void add_status(struct virtio_device *dev, unsigned status)
 {
         dev->config->set_status(dev, dev->config->get_status(dev) | status);
@@ -120,12 +113,16 @@ static int virtio_dev_probe(struct device *_d)
                         set_bit(f, dev->features);
         }
 
+        /* Transport features always preserved to pass to finalize_features. */
+        for (i = VIRTIO_TRANSPORT_F_START; i < VIRTIO_TRANSPORT_F_END; i++)
+                if (device_features & (1 << i))
+                        set_bit(i, dev->features);
+
         err = drv->probe(dev);
         if (err)
                 add_status(dev, VIRTIO_CONFIG_S_FAILED);
         else {
-                /* They should never have set feature bits beyond 32 */
-                dev->config->set_features(dev, dev->features[0]);
+                dev->config->finalize_features(dev);
                 add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
         }
         return err;
@@ -147,13 +144,20 @@ static int virtio_dev_remove(struct device *_d)
         return 0;
 }
 
+static struct bus_type virtio_bus = {
+        .name  = "virtio",
+        .match = virtio_dev_match,
+        .dev_attrs = virtio_dev_attrs,
+        .uevent = virtio_uevent,
+        .probe = virtio_dev_probe,
+        .remove = virtio_dev_remove,
+};
+
 int register_virtio_driver(struct virtio_driver *driver)
 {
         /* Catch this early. */
         BUG_ON(driver->feature_table_size && !driver->feature_table);
         driver->driver.bus = &virtio_bus;
-        driver->driver.probe = virtio_dev_probe;
-        driver->driver.remove = virtio_dev_remove;
         return driver_register(&driver->driver);
 }
 EXPORT_SYMBOL_GPL(register_virtio_driver);
diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index eae7236310e4..c7dc37c7cce9 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -94,12 +94,17 @@ static u32 vp_get_features(struct virtio_device *vdev)
         return ioread32(vp_dev->ioaddr + VIRTIO_PCI_HOST_FEATURES);
 }
 
-/* virtio config->set_features() implementation */
-static void vp_set_features(struct virtio_device *vdev, u32 features)
+/* virtio config->finalize_features() implementation */
+static void vp_finalize_features(struct virtio_device *vdev)
 {
         struct virtio_pci_device *vp_dev = to_vp_device(vdev);
 
-        iowrite32(features, vp_dev->ioaddr + VIRTIO_PCI_GUEST_FEATURES);
+        /* Give virtio_ring a chance to accept features. */
+        vring_transport_features(vdev);
+
+        /* We only support 32 feature bits. */
+        BUILD_BUG_ON(ARRAY_SIZE(vdev->features) != 1);
+        iowrite32(vdev->features[0], vp_dev->ioaddr+VIRTIO_PCI_GUEST_FEATURES);
 }
 
 /* virtio config->get() implementation */
@@ -297,7 +302,7 @@ static struct virtio_config_ops virtio_pci_config_ops = {
         .find_vq        = vp_find_vq,
         .del_vq         = vp_del_vq,
         .get_features   = vp_get_features,
-        .set_features   = vp_set_features,
+        .finalize_features = vp_finalize_features,
 };
 
 /* the PCI probing function */
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 72bf8bc09014..6eb5303fed11 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -18,6 +18,7 @@
  */
 #include <linux/virtio.h>
 #include <linux/virtio_ring.h>
+#include <linux/virtio_config.h>
 #include <linux/device.h>
 
 #ifdef DEBUG
@@ -87,8 +88,11 @@ static int vring_add_buf(struct virtqueue *_vq,
         if (vq->num_free < out + in) {
                 pr_debug("Can't add buf len %i - avail = %i\n",
                          out + in, vq->num_free);
-                /* We notify *even if* VRING_USED_F_NO_NOTIFY is set here. */
-                vq->notify(&vq->vq);
+                /* FIXME: for historical reasons, we force a notify here if
+                 * there are outgoing parts to the buffer.  Presumably the
+                 * host should service the ring ASAP. */
+                if (out)
+                        vq->notify(&vq->vq);
                 END_USE(vq);
                 return -ENOSPC;
         }
@@ -320,4 +324,19 @@ void vring_del_virtqueue(struct virtqueue *vq)
 }
 EXPORT_SYMBOL_GPL(vring_del_virtqueue);
 
+/* Manipulates transport-specific feature bits. */
+void vring_transport_features(struct virtio_device *vdev)
+{
+        unsigned int i;
+
+        for (i = VIRTIO_TRANSPORT_F_START; i < VIRTIO_TRANSPORT_F_END; i++) {
+                switch (i) {
+                default:
+                        /* We don't understand this bit. */
+                        clear_bit(i, vdev->features);
+                }
+        }
+}
+EXPORT_SYMBOL_GPL(vring_transport_features);
+
 MODULE_LICENSE("GPL");
diff --git a/include/asm-s390/kvm_virtio.h b/include/asm-s390/kvm_virtio.h
index 5c871a990c29..146100224def 100644
--- a/include/asm-s390/kvm_virtio.h
+++ b/include/asm-s390/kvm_virtio.h
@@ -50,4 +50,14 @@ struct kvm_vqconfig {
 #define KVM_S390_VIRTIO_RESET           1
 #define KVM_S390_VIRTIO_SET_STATUS      2
 
+#ifdef __KERNEL__
+/* early virtio console setup */
+#ifdef CONFIG_VIRTIO_CONSOLE
+extern void s390_virtio_console_init(void);
+#else
+static inline void s390_virtio_console_init(void)
+{
+}
+#endif /* CONFIG_VIRTIO_CONSOLE */
+#endif /* __KERNEL__ */
 #endif
diff --git a/include/linux/virtio_9p.h b/include/linux/virtio_9p.h
index 8eff0b53910b..b3c4a60ceeb3 100644
--- a/include/linux/virtio_9p.h
+++ b/include/linux/virtio_9p.h
@@ -1,5 +1,7 @@
 #ifndef _LINUX_VIRTIO_9P_H
 #define _LINUX_VIRTIO_9P_H
+/* This header is BSD licensed so anyone can use the definitions to implement
+ * compatible drivers/servers. */
 #include <linux/virtio_config.h>
 
 /* The ID for virtio console */
diff --git a/include/linux/virtio_balloon.h b/include/linux/virtio_balloon.h
index 979524ee75b7..c30c7bfbf39b 100644
--- a/include/linux/virtio_balloon.h
+++ b/include/linux/virtio_balloon.h
@@ -1,5 +1,7 @@
 #ifndef _LINUX_VIRTIO_BALLOON_H
 #define _LINUX_VIRTIO_BALLOON_H
+/* This header is BSD licensed so anyone can use the definitions to implement
+ * compatible drivers/servers. */
 #include <linux/virtio_config.h>
 
 /* The ID for virtio_balloon */
diff --git a/include/linux/virtio_blk.h b/include/linux/virtio_blk.h
index 5f79a5f9de79..c1aef85243bf 100644
--- a/include/linux/virtio_blk.h
+++ b/include/linux/virtio_blk.h
@@ -1,5 +1,7 @@
 #ifndef _LINUX_VIRTIO_BLK_H
 #define _LINUX_VIRTIO_BLK_H
+/* This header is BSD licensed so anyone can use the definitions to implement
+ * compatible drivers/servers. */
 #include <linux/virtio_config.h>
 
 /* The ID for virtio_block */
@@ -11,6 +13,7 @@
 #define VIRTIO_BLK_F_SEG_MAX    2       /* Indicates maximum # of segments */
 #define VIRTIO_BLK_F_GEOMETRY   4       /* Legacy geometry available  */
 #define VIRTIO_BLK_F_RO         5       /* Disk is read-only */
+#define VIRTIO_BLK_F_BLK_SIZE   6       /* Block size of disk is available*/
 
 struct virtio_blk_config
 {
@@ -26,6 +29,8 @@ struct virtio_blk_config
                 __u8 heads;
                 __u8 sectors;
         } geometry;
+        /* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */
+        __u32 blk_size;
 } __attribute__((packed));
 
 /* These two define direction. */
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index f364bbf63c34..bf8ec283b232 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -1,5 +1,8 @@
 #ifndef _LINUX_VIRTIO_CONFIG_H
 #define _LINUX_VIRTIO_CONFIG_H
+/* This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
+ * anyone can use the definitions to implement compatible drivers/servers. */
+
 /* Virtio devices use a standardized configuration space to define their
  * features and pass configuration information, but each implementation can
  * store and access that space differently. */
@@ -15,6 +18,12 @@
 /* We've given up on this device. */
 #define VIRTIO_CONFIG_S_FAILED          0x80
 
+/* Some virtio feature bits (currently bits 28 through 31) are reserved for the
+ * transport being used (eg. virtio_ring), the rest are per-device feature
+ * bits. */
+#define VIRTIO_TRANSPORT_F_START        28
+#define VIRTIO_TRANSPORT_F_END          32
+
 /* Do we get callbacks when the ring is completely used, even if we've
  * suppressed them? */
 #define VIRTIO_F_NOTIFY_ON_EMPTY        24
@@ -52,9 +61,10 @@
  * @get_features: get the array of feature bits for this device.
  *      vdev: the virtio_device
  *      Returns the first 32 feature bits (all we currently need).
- * @set_features: confirm what device features we'll be using.
+ * @finalize_features: confirm what device features we'll be using.
  *      vdev: the virtio_device
- *      feature: the first 32 feature bits
+ *      This gives the final feature bits for the device: it can change
+ *      the dev->feature bits if it wants.
  */
 struct virtio_config_ops
 {
@@ -70,7 +80,7 @@ struct virtio_config_ops
                                      void (*callback)(struct virtqueue *));
         void (*del_vq)(struct virtqueue *vq);
         u32 (*get_features)(struct virtio_device *vdev);
-        void (*set_features)(struct virtio_device *vdev, u32 features);
+        void (*finalize_features)(struct virtio_device *vdev);
 };
 
 /* If driver didn't advertise the feature, it will never appear. */
diff --git a/include/linux/virtio_console.h b/include/linux/virtio_console.h
index ed2d4ead7eb7..19a0da0dba41 100644
--- a/include/linux/virtio_console.h
+++ b/include/linux/virtio_console.h
@@ -1,6 +1,8 @@
 #ifndef _LINUX_VIRTIO_CONSOLE_H
 #define _LINUX_VIRTIO_CONSOLE_H
 #include <linux/virtio_config.h>
+/* This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
+ * anyone can use the definitions to implement compatible drivers/servers. */
 
 /* The ID for virtio console */
 #define VIRTIO_ID_CONSOLE       3
diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net.h
index 38c0571820fb..5e33761b9b8a 100644
--- a/include/linux/virtio_net.h
+++ b/include/linux/virtio_net.h
@@ -1,5 +1,7 @@
 #ifndef _LINUX_VIRTIO_NET_H
 #define _LINUX_VIRTIO_NET_H
+/* This header is BSD licensed so anyone can use the definitions to implement
+ * compatible drivers/servers. */
 #include <linux/virtio_config.h>
 
 /* The ID for virtio_net */
diff --git a/include/linux/virtio_pci.h b/include/linux/virtio_pci.h
index b3151659cf49..cdef35742932 100644
--- a/include/linux/virtio_pci.h
+++ b/include/linux/virtio_pci.h
@@ -9,9 +9,8 @@
  * Authors:
  *  Anthony Liguori  <aliguori@us.ibm.com>
  *
- * This work is licensed under the terms of the GNU GPL, version 2 or later.
- * See the COPYING file in the top-level directory.
- *
+ * This header is BSD licensed so anyone can use the definitions to implement
+ * compatible drivers/servers.
  */
 
 #ifndef _LINUX_VIRTIO_PCI_H
diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
index abe481ed990e..c4a598fb3826 100644
--- a/include/linux/virtio_ring.h
+++ b/include/linux/virtio_ring.h
@@ -120,6 +120,8 @@ struct virtqueue *vring_new_virtqueue(unsigned int num,
                                       void (*notify)(struct virtqueue *vq),
                                       void (*callback)(struct virtqueue *vq));
 void vring_del_virtqueue(struct virtqueue *vq);
+/* Filter out transport-specific feature bits. */
+void vring_transport_features(struct virtio_device *vdev);
 
 irqreturn_t vring_interrupt(int irq, void *_vq);
 #endif /* __KERNEL__ */
diff --git a/include/linux/virtio_rng.h b/include/linux/virtio_rng.h
index 331afb6c9f62..1a85dab8a940 100644
--- a/include/linux/virtio_rng.h
+++ b/include/linux/virtio_rng.h
@@ -1,5 +1,7 @@
 #ifndef _LINUX_VIRTIO_RNG_H
 #define _LINUX_VIRTIO_RNG_H
+/* This header is BSD licensed so anyone can use the definitions to implement
+ * compatible drivers/servers. */
 #include <linux/virtio_config.h>
 
 /* The ID for virtio_rng */