diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c
index 3be8ab2a886acf98e2b0a45ab3690fd20fc8bedc..82fafe0429fed8dc441411059be52b33154dd8a8 100644
--- a/Documentation/lguest/lguest.c
+++ b/Documentation/lguest/lguest.c
@@ -157,6 +157,9 @@ struct virtqueue
/* The routine to call when the Guest pings us. */
void (*handle_output)(int fd, struct virtqueue *me);
+
+ /* Outstanding buffers */
+ unsigned int inflight;
};
/* Remember the arguments to the program so we can "reboot" */
@@ -702,6 +705,7 @@ static unsigned get_vq_desc(struct virtqueue *vq,
errx(1, "Looped descriptor");
} while ((i = next_desc(vq, i)) != vq->vring.num);
+ vq->inflight++;
return head;
}
@@ -719,6 +723,7 @@ static void add_used(struct virtqueue *vq, unsigned int head, int len)
/* Make sure buffer is written before we update index. */
wmb();
vq->vring.used->idx++;
+ vq->inflight--;
}
/* This actually sends the interrupt for this virtqueue */
@@ -726,8 +731,9 @@ static void trigger_irq(int fd, struct virtqueue *vq)
{
unsigned long buf[] = { LHREQ_IRQ, vq->config.irq };
- /* If they don't want an interrupt, don't send one. */
- if (vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
+ /* If they don't want an interrupt, don't send one, unless empty. */
+ if ((vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
+ && vq->inflight)
return;
/* Send the Guest an interrupt tell them we used something up. */
@@ -1107,6 +1113,7 @@ static void add_virtqueue(struct device *dev, unsigned int num_descs,
vq->next = NULL;
vq->last_avail_idx = 0;
vq->dev = dev;
+ vq->inflight = 0;
/* Initialize the configuration. */
vq->config.num = num_descs;
@@ -1368,6 +1375,7 @@ static void setup_tun_net(const char *arg)
/* Tell Guest what MAC address to use. */
add_feature(dev, VIRTIO_NET_F_MAC);
+ add_feature(dev, VIRTIO_F_NOTIFY_ON_EMPTY);
set_config(dev, sizeof(conf), &conf);
/* We don't need the socket any more; setup is done. */
diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index af65b2da3ba0dabd19d0e14fcfbb52577ff4c96c..5c7e2fd52075be167680311b13d5e7c9d120bbe4 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -582,8 +582,9 @@ static void __init lguest_init_IRQ(void)
int vector = FIRST_EXTERNAL_VECTOR + i;
if (vector != SYSCALL_VECTOR) {
set_intr_gate(vector, interrupt[i]);
- set_irq_chip_and_handler(i, &lguest_irq_controller,
- handle_level_irq);
+ set_irq_chip_and_handler_name(i, &lguest_irq_controller,
+ handle_level_irq,
+ "level");
}
}
/* This call is required to set up for 4k stacks, where we have
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 84e064ffee5229e73d2f9f45af19a3ec581f5315..dd7ea203f940dc664a9ac74ef9fa157ac3a36b5b 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -260,6 +260,10 @@ static int virtblk_probe(struct virtio_device *vdev)
if (virtio_has_feature(vdev, VIRTIO_BLK_F_BARRIER))
blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_TAG, NULL);
+ /* If disk is read-only in the host, the guest should obey */
+ if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))
+ set_disk_ro(vblk->disk, 1);
+
/* Host must always specify the capacity. */
vdev->config->get(vdev, offsetof(struct virtio_blk_config, capacity),
&cap, sizeof(cap));
@@ -311,6 +315,7 @@ static void virtblk_remove(struct virtio_device *vdev)
/* Stop all the virtqueues. */
vdev->config->reset(vdev);
+ del_gendisk(vblk->disk);
blk_cleanup_queue(vblk->disk->queue);
put_disk(vblk->disk);
mempool_destroy(vblk->pool);
@@ -325,7 +330,7 @@ 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_GEOMETRY, VIRTIO_BLK_F_RO,
};
static struct virtio_driver virtio_blk = {
diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index 8d6c2089d2a8480bf1829d0b3d24bca959b22a31..efd0b4db7c8ed6c5d6c6bbc5a473466f898fdf1d 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -112,3 +112,12 @@ config HW_RANDOM_PASEMI
If unsure, say Y.
+config HW_RANDOM_VIRTIO
+ tristate "VirtIO Random Number Generator support"
+ depends on HW_RANDOM && VIRTIO
+ ---help---
+ This driver provides kernel-side support for the virtual Random Number
+ Generator hardware.
+
+ To compile this driver as a module, choose M here: the
+ module will be called virtio-rng. If unsure, say N.
diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index c8b7300e2fb183f6ed6c6d1eb4f6ccfa358fb6bc..b4940ddbb35f5993c80c164dbea1a2046915d1dd 100644
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_HW_RANDOM_VIA) += via-rng.o
obj-$(CONFIG_HW_RANDOM_IXP4XX) += ixp4xx-rng.o
obj-$(CONFIG_HW_RANDOM_OMAP) += omap-rng.o
obj-$(CONFIG_HW_RANDOM_PASEMI) += pasemi-rng.o
+obj-$(CONFIG_HW_RANDOM_VIRTIO) += virtio-rng.o
diff --git a/drivers/char/hw_random/virtio-rng.c b/drivers/char/hw_random/virtio-rng.c
new file mode 100644
index 0000000000000000000000000000000000000000..d0e563e4fc399bf37f06a4d19cea0bfcb5017713
--- /dev/null
+++ b/drivers/char/hw_random/virtio-rng.c
@@ -0,0 +1,155 @@
+/*
+ * Randomness driver for virtio
+ * Copyright (C) 2007, 2008 Rusty Russell IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include <linux/err.h>
+#include <linux/hw_random.h>
+#include <linux/scatterlist.h>
+#include <linux/spinlock.h>
+#include <linux/virtio.h>
+#include <linux/virtio_rng.h>
+
+/* The host will fill any buffer we give it with sweet, sweet randomness. We
+ * give it 64 bytes at a time, and the hwrng framework takes it 4 bytes at a
+ * time. */
+#define RANDOM_DATA_SIZE 64
+
+static struct virtqueue *vq;
+static u32 *random_data;
+static unsigned int data_left;
+static DECLARE_COMPLETION(have_data);
+
+static void random_recv_done(struct virtqueue *vq)
+{
+ int len;
+
+ /* We never get spurious callbacks. */
+ if (!vq->vq_ops->get_buf(vq, &len))
+ BUG();
+
+ data_left = len / sizeof(random_data[0]);
+ complete(&have_data);
+}
+
+static void register_buffer(void)
+{
+ struct scatterlist sg;
+
+ sg_init_one(&sg, random_data, RANDOM_DATA_SIZE);
+ /* There should always be room for one buffer. */
+ if (vq->vq_ops->add_buf(vq, &sg, 0, 1, random_data) != 0)
+ BUG();
+ vq->vq_ops->kick(vq);
+}
+
+/* At least we don't udelay() in a loop like some other drivers. */
+static int virtio_data_present(struct hwrng *rng, int wait)
+{
+ if (data_left)
+ return 1;
+
+ if (!wait)
+ return 0;
+
+ wait_for_completion(&have_data);
+ return 1;
+}
+
+/* virtio_data_present() must have succeeded before this is called. */
+static int virtio_data_read(struct hwrng *rng, u32 *data)
+{
+ BUG_ON(!data_left);
+
+ *data = random_data[--data_left];
+
+ if (!data_left) {
+ init_completion(&have_data);
+ register_buffer();
+ }
+ return sizeof(*data);
+}
+
+static struct hwrng virtio_hwrng = {
+ .name = "virtio",
+ .data_present = virtio_data_present,
+ .data_read = virtio_data_read,
+};
+
+static int virtrng_probe(struct virtio_device *vdev)
+{
+ int err;
+
+ /* We expect a single virtqueue. */
+ vq = vdev->config->find_vq(vdev, 0, random_recv_done);
+ if (IS_ERR(vq))
+ return PTR_ERR(vq);
+
+ err = hwrng_register(&virtio_hwrng);
+ if (err) {
+ vdev->config->del_vq(vq);
+ return err;
+ }
+
+ register_buffer();
+ return 0;
+}
+
+static void virtrng_remove(struct virtio_device *vdev)
+{
+ vdev->config->reset(vdev);
+ hwrng_unregister(&virtio_hwrng);
+ vdev->config->del_vq(vq);
+}
+
+static struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_RNG, VIRTIO_DEV_ANY_ID },
+ { 0 },
+};
+
+static struct virtio_driver virtio_rng = {
+ .driver.name = KBUILD_MODNAME,
+ .driver.owner = THIS_MODULE,
+ .id_table = id_table,
+ .probe = virtrng_probe,
+ .remove = __devexit_p(virtrng_remove),
+};
+
+static int __init init(void)
+{
+ int err;
+
+ random_data = kmalloc(RANDOM_DATA_SIZE, GFP_KERNEL);
+ if (!random_data)
+ return -ENOMEM;
+
+ err = register_virtio_driver(&virtio_rng);
+ if (err)
+ kfree(random_data);
+ return err;
+}
+
+static void __exit fini(void)
+{
+ kfree(random_data);
+ unregister_virtio_driver(&virtio_rng);
+}
+module_init(init);
+module_exit(fini);
+
+MODULE_DEVICE_TABLE(virtio, id_table);
+MODULE_DESCRIPTION("Virtio random number driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
index 8080249957afb6d747631674d32cdc287319f96c..1a8de57289eb97e5877b9016855cfe9e99adaac1 100644
--- a/drivers/lguest/lguest_device.c
+++ b/drivers/lguest/lguest_device.c
@@ -20,14 +20,11 @@
/* The pointer to our (page) of device descriptions. */
static void *lguest_devices;
-/* Unique numbering for lguest devices. */
-static unsigned int dev_index;
-
/* For Guests, device memory can be used as normal memory, so we cast away the
* __iomem to quieten sparse. */
static inline void *lguest_map(unsigned long phys_addr, unsigned long pages)
{
- return (__force void *)ioremap(phys_addr, PAGE_SIZE*pages);
+ return (__force void *)ioremap_cache(phys_addr, PAGE_SIZE*pages);
}
static inline void lguest_unmap(void *addr)
@@ -325,8 +322,10 @@ static struct device lguest_root = {
* As Andrew Tridgell says, "Untested code is buggy code".
*
* It's worth reading this carefully: we start with a pointer to the new device
- * descriptor in the "lguest_devices" page. */
-static void add_lguest_device(struct lguest_device_desc *d)
+ * descriptor in the "lguest_devices" page, and the offset into the device
+ * descriptor page so we can uniquely identify it if things go badly wrong. */
+static void add_lguest_device(struct lguest_device_desc *d,
+ unsigned int offset)
{
struct lguest_device *ldev;
@@ -334,18 +333,14 @@ static void add_lguest_device(struct lguest_device_desc *d)
* it. */
ldev = kzalloc(sizeof(*ldev), GFP_KERNEL);
if (!ldev) {
- printk(KERN_EMERG "Cannot allocate lguest dev %u\n",
- dev_index++);
+ printk(KERN_EMERG "Cannot allocate lguest dev %u type %u\n",
+ offset, d->type);
return;
}
/* This devices' parent is the lguest/ dir. */
ldev->vdev.dev.parent = &lguest_root;
/* We have a unique device index thanks to the dev_index counter. */
- ldev->vdev.index = dev_index++;
- /* The device type comes straight from the descriptor. There's also a
- * device vendor field in the virtio_device struct, which we leave as
- * 0. */
ldev->vdev.id.device = d->type;
/* We have a simple set of routines for querying the device's
* configuration information and setting its status. */
@@ -357,8 +352,8 @@ static void add_lguest_device(struct lguest_device_desc *d)
* virtio_device and calls device_register(). This makes the bus
* infrastructure look for a matching driver. */
if (register_virtio_device(&ldev->vdev) != 0) {
- printk(KERN_ERR "Failed to register lguest device %u\n",
- ldev->vdev.index);
+ printk(KERN_ERR "Failed to register lguest dev %u type %u\n",
+ offset, d->type);
kfree(ldev);
}
}
@@ -379,7 +374,7 @@ static void scan_devices(void)
break;
printk("Device at %i has size %u\n", i, desc_size(d));
- add_lguest_device(d);
+ add_lguest_device(d, i);
}
}
diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index 9f55ce6f3c7817380f87a429ae74d0f071fa3047..5ab34340919be3a417caf1ad5bfd50ff91f1054d 100644
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -31,11 +31,6 @@
*/
static void *kvm_devices;
-/*
- * Unique numbering for kvm devices.
- */
-static unsigned int dev_index;
-
struct kvm_device {
struct virtio_device vdev;
struct kvm_device_desc *desc;
@@ -250,26 +245,25 @@ static struct device kvm_root = {
* adds a new device and register it with virtio
* appropriate drivers are loaded by the device model
*/
-static void add_kvm_device(struct kvm_device_desc *d)
+static void add_kvm_device(struct kvm_device_desc *d, unsigned int offset)
{
struct kvm_device *kdev;
kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
if (!kdev) {
- printk(KERN_EMERG "Cannot allocate kvm dev %u\n",
- dev_index++);
+ printk(KERN_EMERG "Cannot allocate kvm dev %u type %u\n",
+ offset, d->type);
return;
}
kdev->vdev.dev.parent = &kvm_root;
- kdev->vdev.index = dev_index++;
kdev->vdev.id.device = d->type;
kdev->vdev.config = &kvm_vq_configspace_ops;
kdev->desc = d;
if (register_virtio_device(&kdev->vdev) != 0) {
- printk(KERN_ERR "Failed to register kvm device %u\n",
- kdev->vdev.index);
+ printk(KERN_ERR "Failed to register kvm device %u type %u\n",
+ offset, d->type);
kfree(kdev);
}
}
@@ -289,7 +283,7 @@ static void scan_devices(void)
if (d->type == 0)
break;
- add_kvm_device(d);
+ add_kvm_device(d, i);
}
}
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index 13866789b3561027b803797a95c985f573671fd4..0f3c2bb7bf3523ef2987788389c640748f516b39 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -2,6 +2,9 @@
#include <linux/spinlock.h>
#include <linux/virtio_config.h>
+/* Unique numbering for virtio devices. */
+static unsigned int dev_index;
+
static ssize_t device_show(struct device *_d,
struct device_attribute *attr, char *buf)
{
@@ -166,7 +169,10 @@ int register_virtio_device(struct virtio_device *dev)
int err;
dev->dev.bus = &virtio_bus;
- sprintf(dev->dev.bus_id, "%u", dev->index);
+
+ /* Assign a unique device index and hence name. */
+ dev->index = dev_index++;
+ sprintf(dev->dev.bus_id, "virtio%u", dev->index);
/* We always start by resetting the device, in case a previous
* driver messed it up. This also tests that code path a little. */
diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index 27e9fc9117cdfa69fee88e32e3636a844d803d5e..eae7236310e450ce1647a25a480eccad9147dec4 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -78,9 +78,6 @@ static struct device virtio_pci_root = {
.bus_id = "virtio-pci",
};
-/* Unique numbering for devices under the kvm root */
-static unsigned int dev_index;
-
/* Convert a generic virtio device to our structure */
static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev)
{
@@ -325,10 +322,6 @@ static int __devinit virtio_pci_probe(struct pci_dev *pci_dev,
if (vp_dev == NULL)
return -ENOMEM;
- snprintf(vp_dev->vdev.dev.bus_id, BUS_ID_SIZE, "virtio%d", dev_index);
- vp_dev->vdev.index = dev_index;
- dev_index++;
-
vp_dev->vdev.dev.parent = &virtio_pci_root;
vp_dev->vdev.config = &virtio_pci_config_ops;
vp_dev->pci_dev = pci_dev;
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 937a49d6772cc5271d22ef48cb14df6bf56c07f7..72bf8bc090142f02a9065c0ff0448299a5e9a2e7 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -227,7 +227,6 @@ static bool vring_enable_cb(struct virtqueue *_vq)
struct vring_virtqueue *vq = to_vvq(_vq);
START_USE(vq);
- BUG_ON(!(vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT));
/* We optimistically turn back on interrupts, then check if there was
* more to do. */
@@ -254,13 +253,6 @@ irqreturn_t vring_interrupt(int irq, void *_vq)
if (unlikely(vq->broken))
return IRQ_HANDLED;
- /* Other side may have missed us turning off the interrupt,
- * but we should preserve disable semantic for virtio users. */
- if (unlikely(vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT)) {
- pr_debug("virtqueue interrupt after disable for %p\n", vq);
- return IRQ_HANDLED;
- }
-
pr_debug("virtqueue callback for %p (%p)\n", vq, vq->vq.callback);
if (vq->vq.callback)
vq->vq.callback(&vq->vq);
diff --git a/include/linux/virtio_blk.h b/include/linux/virtio_blk.h
index d4695a3356d018f4198df0d5813070cc4b5cf5ad..5f79a5f9de796b297c86f2647acfce713a533826 100644
--- a/include/linux/virtio_blk.h
+++ b/include/linux/virtio_blk.h
@@ -10,18 +10,19 @@
#define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */
#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 */
struct virtio_blk_config
{
/* The capacity (in 512-byte sectors). */
- __le64 capacity;
+ __u64 capacity;
/* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */
- __le32 size_max;
+ __u32 size_max;
/* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */
- __le32 seg_max;
+ __u32 seg_max;
/* geometry the device (if VIRTIO_BLK_F_GEOMETRY) */
struct virtio_blk_geometry {
- __le16 cylinders;
+ __u16 cylinders;
__u8 heads;
__u8 sectors;
} geometry;
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 50db245c81ad94f1131d88b512c100219475717b..f364bbf63c3413547738ae4028b399577bc76650 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -15,6 +15,10 @@
/* We've given up on this device. */
#define VIRTIO_CONFIG_S_FAILED 0x80
+/* Do we get callbacks when the ring is completely used, even if we've
+ * suppressed them? */
+#define VIRTIO_F_NOTIFY_ON_EMPTY 24
+
#ifdef __KERNEL__
#include <linux/virtio.h>
@@ -99,7 +103,7 @@ static inline bool virtio_has_feature(const struct virtio_device *vdev,
* The return value is -ENOENT if the feature doesn't exist. Otherwise
* the config value is copied into whatever is pointed to by v. */
#define virtio_config_val(vdev, fbit, offset, v) \
- virtio_config_buf((vdev), (fbit), (offset), (v), sizeof(v))
+ virtio_config_buf((vdev), (fbit), (offset), (v), sizeof(*v))
static inline int virtio_config_buf(struct virtio_device *vdev,
unsigned int fbit,
diff --git a/include/linux/virtio_rng.h b/include/linux/virtio_rng.h
new file mode 100644
index 0000000000000000000000000000000000000000..331afb6c9f6282a21b9efb7972a161563122974e
--- /dev/null
+++ b/include/linux/virtio_rng.h
@@ -0,0 +1,8 @@
+#ifndef _LINUX_VIRTIO_RNG_H
+#define _LINUX_VIRTIO_RNG_H
+#include <linux/virtio_config.h>
+
+/* The ID for virtio_rng */
+#define VIRTIO_ID_RNG 4
+
+#endif /* _LINUX_VIRTIO_RNG_H */