#define le32_to_cpu(v32) (v32)
#define le64_to_cpu(v64) (v64)
+/*
+ * A real device would ignore weird/non-compliant driver behaviour. We
+ * stop and flag it, to help debugging Linux problems.
+ */
+#define bad_driver(d, fmt, ...) \
+ errx(1, "%s: bad driver: " fmt, (d)->name, ## __VA_ARGS__)
+#define bad_driver_vq(vq, fmt, ...) \
+ errx(1, "%s vq %s: bad driver: " fmt, (vq)->dev->name, \
+ vq->name, ## __VA_ARGS__)
+
/* Is this iovec empty? */
static bool iov_empty(const struct iovec iov[], unsigned int num_iov)
{
}
/* Take len bytes from the front of this iovec. */
-static void iov_consume(struct iovec iov[], unsigned num_iov,
+static void iov_consume(struct device *d,
+ struct iovec iov[], unsigned num_iov,
void *dest, unsigned len)
{
unsigned int i;
len -= used;
}
if (len != 0)
- errx(1, "iovec too short!");
+ bad_driver(d, "iovec too short!");
}
/*L:100
* we have a convenient routine which checks it and exits with an error message
* if something funny is going on:
*/
-static void *_check_pointer(unsigned long addr, unsigned int size,
+static void *_check_pointer(struct device *d,
+ unsigned long addr, unsigned int size,
unsigned int line)
{
/*
* or addr + size wraps around.
*/
if ((addr + size) > guest_limit || (addr + size) < addr)
- errx(1, "%s:%i: Invalid address %#lx", __FILE__, line, addr);
+ bad_driver(d, "%s:%i: Invalid address %#lx",
+ __FILE__, line, addr);
/*
* We return a pointer for the caller's convenience, now we know it's
* safe to use.
return from_guest_phys(addr);
}
/* A macro which transparently hands the line number to the real function. */
-#define check_pointer(addr,size) _check_pointer(addr, size, __LINE__)
+#define check_pointer(d,addr,size) _check_pointer(d, addr, size, __LINE__)
/*
* Each buffer in the virtqueues is actually a chain of descriptors. This
* function returns the next descriptor in the chain, or vq->vring.num if we're
* at the end.
*/
-static unsigned next_desc(struct vring_desc *desc,
+static unsigned next_desc(struct device *d, struct vring_desc *desc,
unsigned int i, unsigned int max)
{
unsigned int next;
wmb();
if (next >= max)
- errx(1, "Desc next is %u", next);
+ bad_driver(d, "Desc next is %u", next);
return next;
}
* The driver MUST set flags to 0 or 1.
*/
if (vq->vring.avail->flags > 1)
- errx(1, "%s: avail->flags = %u\n",
- vq->dev->name, vq->vring.avail->flags);
+ bad_driver_vq(vq, "avail->flags = %u\n", vq->vring.avail->flags);
/*
* 2.4.7.2:
/* Check it isn't doing very strange things with descriptor numbers. */
if ((u16)(vq->vring.avail->idx - last_avail) > vq->vring.num)
- errx(1, "Guest moved used index from %u to %u",
- last_avail, vq->vring.avail->idx);
+ bad_driver_vq(vq, "Guest moved used index from %u to %u",
+ last_avail, vq->vring.avail->idx);
/*
* Make sure we read the descriptor number *after* we read the ring
/* If their number is silly, that's a fatal mistake. */
if (head >= vq->vring.num)
- errx(1, "Guest says index %u is available", head);
+ bad_driver_vq(vq, "Guest says index %u is available", head);
/* When we start there are none of either input nor output. */
*out_num = *in_num = 0;
*/
if (!(vq->dev->features_accepted &
(1<<VIRTIO_RING_F_INDIRECT_DESC)))
- errx(1, "%s: vq indirect not negotiated",
- vq->dev->name);
+ bad_driver_vq(vq, "vq indirect not negotiated");
/*
* 2.4.5.3.1:
* table per descriptor).
*/
if (desc != vq->vring.desc)
- errx(1, "%s: Indirect within indirect",
- vq->dev->name);
+ bad_driver_vq(vq, "Indirect within indirect");
/*
* Proposed update VIRTIO-134 spells this out:
* and VIRTQ_DESC_F_NEXT in flags.
*/
if (desc[i].flags & VRING_DESC_F_NEXT)
- errx(1, "%s: indirect and next together",
- vq->dev->name);
+ bad_driver_vq(vq, "indirect and next together");
if (desc[i].len % sizeof(struct vring_desc))
- errx(1, "Invalid size for indirect buffer table");
+ bad_driver_vq(vq,
+ "Invalid size for indirect table");
/*
* 2.4.5.3.2:
*
*/
max = desc[i].len / sizeof(struct vring_desc);
- desc = check_pointer(desc[i].addr, desc[i].len);
+ desc = check_pointer(vq->dev, desc[i].addr, desc[i].len);
i = 0;
/* 2.4.5.3.1:
* than the Queue Size of the device.
*/
if (max > vq->pci_config.queue_size)
- errx(1, "%s: indirect has too many entries",
- vq->dev->name);
+ bad_driver_vq(vq,
+ "indirect has too many entries");
}
/* Grab the first descriptor, and check it's OK. */
iov[*out_num + *in_num].iov_len = desc[i].len;
iov[*out_num + *in_num].iov_base
- = check_pointer(desc[i].addr, desc[i].len);
+ = check_pointer(vq->dev, desc[i].addr, desc[i].len);
/* If this is an input descriptor, increment that count. */
if (desc[i].flags & VRING_DESC_F_WRITE)
(*in_num)++;
* to come before any input descriptors.
*/
if (*in_num)
- errx(1, "Descriptor has out after in");
+ bad_driver_vq(vq,
+ "Descriptor has out after in");
(*out_num)++;
}
/* If we've got too many, that implies a descriptor loop. */
if (*out_num + *in_num > max)
- errx(1, "Looped descriptor");
- } while ((i = next_desc(desc, i, max)) != max);
+ bad_driver_vq(vq, "Looped descriptor");
+ } while ((i = next_desc(vq->dev, desc, i, max)) != max);
return head;
}
/* Make sure there's a descriptor available. */
head = wait_for_vq_desc(vq, iov, &out_num, &in_num);
if (out_num)
- errx(1, "Output buffers in console in queue?");
+ bad_driver_vq(vq, "Output buffers in console in queue?");
/* Read into it. This is where we usually wait. */
len = readv(STDIN_FILENO, iov, in_num);
/* We usually wait in here, for the Guest to give us something. */
head = wait_for_vq_desc(vq, iov, &out, &in);
if (in)
- errx(1, "Input buffers in console output queue?");
+ bad_driver_vq(vq, "Input buffers in console output queue?");
/* writev can return a partial write, so we loop here. */
while (!iov_empty(iov, out)) {
warn("Write to stdout gave %i (%d)", len, errno);
break;
}
- iov_consume(iov, out, NULL, len);
+ iov_consume(vq->dev, iov, out, NULL, len);
}
/*
/* We usually wait in here for the Guest to give us a packet. */
head = wait_for_vq_desc(vq, iov, &out, &in);
if (in)
- errx(1, "Input buffers in net output queue?");
+ bad_driver_vq(vq, "Input buffers in net output queue?");
/*
* Send the whole thing through to /dev/net/tun. It expects the exact
* same format: what a coincidence!
*/
head = wait_for_vq_desc(vq, iov, &out, &in);
if (out)
- errx(1, "Output buffers in net input queue?");
+ bad_driver_vq(vq, "Output buffers in net input queue?");
/*
* If it looks like we'll block reading from the tun device, send them
*/
/* Must be bar 0 */
if (!valid_bar_access(d, &d->config.cfg_access))
- errx(1, "Invalid cfg_access to bar%u, offset %u len %u",
+ bad_driver(d,
+ "Invalid cfg_access to bar%u, offset %u len %u",
d->config.cfg_access.cap.bar,
d->config.cfg_access.cap.offset,
d->config.cfg_access.cap.length);
if (vq->pci_config.queue_desc_hi
|| vq->pci_config.queue_avail_hi
|| vq->pci_config.queue_used_hi)
- errx(1, "%s: invalid 64-bit queue address", d->name);
+ bad_driver_vq(vq, "invalid 64-bit queue address");
/*
* 2.4.1:
if (vq->pci_config.queue_desc_lo % 16
|| vq->pci_config.queue_avail_lo % 2
|| vq->pci_config.queue_used_lo % 4)
- errx(1, "%s: invalid alignment in queue addresses", d->name);
+ bad_driver_vq(vq, "invalid alignment in queue addresses");
/* Initialize the virtqueue and check they're all in range. */
vq->vring.num = vq->pci_config.queue_size;
- vq->vring.desc = check_pointer(vq->pci_config.queue_desc_lo,
+ vq->vring.desc = check_pointer(vq->dev,
+ vq->pci_config.queue_desc_lo,
sizeof(*vq->vring.desc) * vq->vring.num);
- vq->vring.avail = check_pointer(vq->pci_config.queue_avail_lo,
+ vq->vring.avail = check_pointer(vq->dev,
+ vq->pci_config.queue_avail_lo,
sizeof(*vq->vring.avail)
+ (sizeof(vq->vring.avail->ring[0])
* vq->vring.num));
- vq->vring.used = check_pointer(vq->pci_config.queue_used_lo,
+ vq->vring.used = check_pointer(vq->dev,
+ vq->pci_config.queue_used_lo,
sizeof(*vq->vring.used)
+ (sizeof(vq->vring.used->ring[0])
* vq->vring.num));
* when allocating the used ring.
*/
if (vq->vring.used->flags != 0)
- errx(1, "%s: invalid initial used.flags %#x",
- d->name, vq->vring.used->flags);
+ bad_driver_vq(vq, "invalid initial used.flags %#x",
+ vq->vring.used->flags);
}
static void start_virtqueue(struct virtqueue *vq)
goto feature_write_through32;
case offsetof(struct virtio_pci_mmio, cfg.guest_feature_select):
if (val > 1)
- errx(1, "%s: Unexpected driver select %u",
- d->name, val);
+ bad_driver(d, "Unexpected driver select %u", val);
goto feature_write_through32;
case offsetof(struct virtio_pci_mmio, cfg.guest_feature):
if (d->mmio->cfg.guest_feature_select == 0) {
* not offer
*/
if (d->features_accepted & ~d->features)
- errx(1, "%s: over-accepted features %#llx of %#llx",
- d->name, d->features_accepted, d->features);
+ bad_driver(d, "over-accepted features %#llx of %#llx",
+ d->features_accepted, d->features);
goto feature_write_through32;
case offsetof(struct virtio_pci_mmio, cfg.device_status): {
u8 prev;
/* 2.1.1: The driver MUST NOT clear a device status bit. */
if (d->mmio->cfg.device_status & ~val)
- errx(1, "%s: unset of device status bit %#x -> %#x",
- d->name, d->mmio->cfg.device_status, val);
+ bad_driver(d, "unset of device status bit %#x -> %#x",
+ d->mmio->cfg.device_status, val);
/*
* 2.1.2:
case VIRTIO_CONFIG_S_ACKNOWLEDGE:
break;
default:
- errx(1, "%s: unknown device status bit %#x -> %#x",
- d->name, d->mmio->cfg.device_status, val);
+ bad_driver(d, "unknown device status bit %#x -> %#x",
+ d->mmio->cfg.device_status, val);
}
if (d->mmio->cfg.device_status != prev)
- errx(1, "%s: unexpected status transition %#x -> %#x",
- d->name, d->mmio->cfg.device_status, val);
+ bad_driver(d, "unexpected status transition %#x -> %#x",
+ d->mmio->cfg.device_status, val);
/* If they just wrote FEATURES_OK, we make sure they read */
switch (val & ~d->mmio->cfg.device_status) {
break;
case VIRTIO_CONFIG_S_DRIVER_OK:
if (d->wrote_features_ok)
- errx(1, "%s: did not re-read FEATURES_OK",
- d->name);
+ bad_driver(d, "did not re-read FEATURES_OK");
break;
}
goto write_through8;
* to queue_size.
*/
if (val & (val-1))
- errx(1, "%s: invalid queue size %u\n", d->name, val);
+ bad_driver(d, "invalid queue size %u", val);
if (d->mmio->cfg.queue_enable)
- errx(1, "%s: changing queue size on live device",
- d->name);
+ bad_driver(d, "changing queue size on live device");
goto write_through16;
case offsetof(struct virtio_pci_mmio, cfg.queue_msix_vector):
- errx(1, "%s: attempt to set MSIX vector to %u",
- d->name, val);
+ bad_driver(d, "attempt to set MSIX vector to %u", val);
case offsetof(struct virtio_pci_mmio, cfg.queue_enable): {
struct virtqueue *vq = vq_by_num(d, d->mmio->cfg.queue_select);
* The driver MUST NOT write a 0 to queue_enable.
*/
if (val != 1)
- errx(1, "%s: setting queue_enable to %u", d->name, val);
+ bad_driver(d, "setting queue_enable to %u", val);
/*
* 3.1.1:
* they should have done that before setting DRIVER_OK.
*/
if (d->mmio->cfg.device_status & VIRTIO_CONFIG_S_DRIVER_OK)
- errx(1, "%s: enabling vs after DRIVER_OK", d->name);
+ bad_driver(d, "enabling vq after DRIVER_OK");
d->mmio->cfg.queue_enable = val;
save_vq_config(&d->mmio->cfg, vq);
goto write_through16;
}
case offsetof(struct virtio_pci_mmio, cfg.queue_notify_off):
- errx(1, "%s: attempt to write to queue_notify_off", d->name);
+ bad_driver(d, "attempt to write to queue_notify_off");
case offsetof(struct virtio_pci_mmio, cfg.queue_desc_lo):
case offsetof(struct virtio_pci_mmio, cfg.queue_desc_hi):
case offsetof(struct virtio_pci_mmio, cfg.queue_avail_lo):
* enabling the virtqueue with queue_enable.
*/
if (d->mmio->cfg.queue_enable)
- errx(1, "%s: changing queue on live device",
- d->name);
+ bad_driver(d, "changing queue on live device");
/*
* 3.1.1:
* accept new feature bits after this step.
*/
if (!(d->mmio->cfg.device_status & VIRTIO_CONFIG_S_FEATURES_OK))
- errx(1, "%s: enabling vs before FEATURES_OK", d->name);
+ bad_driver(d, "setting up vq before FEATURES_OK");
/*
* 6. Re-read device status to ensure the FEATURES_OK bit is
* still set...
*/
if (d->wrote_features_ok)
- errx(1, "%s: didn't re-read FEATURES_OK before setup",
- d->name);
+ bad_driver(d, "didn't re-read FEATURES_OK before setup");
goto write_through32;
case offsetof(struct virtio_pci_mmio, notify):
vq = vq_by_num(d, val);
if (!vq)
- errx(1, "Invalid vq notification on %u", val);
+ bad_driver(d, "Invalid vq notification on %u", val);
/* Notify the process handling this vq by adding 1 to eventfd */
write(vq->eventfd, "\1\0\0\0\0\0\0\0", 8);
goto write_through16;
case offsetof(struct virtio_pci_mmio, isr):
- errx(1, "%s: Unexpected write to isr", d->name);
+ bad_driver(d, "Unexpected write to isr");
/* Weird corner case: write to emerg_wr of console */
case sizeof(struct virtio_pci_mmio)
+ offsetof(struct virtio_console_config, emerg_wr):
* The driver MUST NOT write to device_feature, num_queues,
* config_generation or queue_notify_off.
*/
- errx(1, "%s: Unexpected write to offset %u", d->name, off);
+ bad_driver(d, "Unexpected write to offset %u", off);
}
feature_write_through32:
* accept new feature bits after this step.
*/
if (!(d->mmio->cfg.device_status & VIRTIO_CONFIG_S_DRIVER))
- errx(1, "%s: feature write before VIRTIO_CONFIG_S_DRIVER",
- d->name);
+ bad_driver(d, "feature write before VIRTIO_CONFIG_S_DRIVER");
if (d->mmio->cfg.device_status & VIRTIO_CONFIG_S_FEATURES_OK)
- errx(1, "%s: feature write after VIRTIO_CONFIG_S_FEATURES_OK",
- d->name);
+ bad_driver(d, "feature write after VIRTIO_CONFIG_S_FEATURES_OK");
/*
* 4.1.3.1:
*/
write_through32:
if (mask != 0xFFFFFFFF) {
- errx(1, "%s: non-32-bit write to offset %u (%#x)",
- d->name, off, getreg(eip));
+ bad_driver(d, "non-32-bit write to offset %u (%#x)",
+ off, getreg(eip));
return;
}
memcpy((char *)d->mmio + off, &val, 4);
write_through16:
if (mask != 0xFFFF)
- errx(1, "%s: non-16-bit (%#x) write to offset %u (%#x)",
- d->name, mask, off, getreg(eip));
+ bad_driver(d, "non-16-bit write to offset %u (%#x)",
+ off, getreg(eip));
memcpy((char *)d->mmio + off, &val, 2);
return;
write_through8:
if (mask != 0xFF)
- errx(1, "%s: non-8-bit write to offset %u (%#x)",
- d->name, off, getreg(eip));
+ bad_driver(d, "non-8-bit write to offset %u (%#x)",
+ off, getreg(eip));
memcpy((char *)d->mmio + off, &val, 1);
return;
}
* to the device.
*/
if (!(d->mmio->cfg.device_status & VIRTIO_CONFIG_S_DRIVER))
- errx(1, "%s: feature read before VIRTIO_CONFIG_S_DRIVER",
- d->name);
+ bad_driver(d,
+ "feature read before VIRTIO_CONFIG_S_DRIVER");
goto read_through32;
case offsetof(struct virtio_pci_mmio, cfg.msix_config):
- errx(1, "%s: read of msix_config", d->name);
+ bad_driver(d, "read of msix_config");
case offsetof(struct virtio_pci_mmio, cfg.num_queues):
goto read_through16;
case offsetof(struct virtio_pci_mmio, cfg.device_status):
* DRIVER_OK.
*/
if (!(d->mmio->cfg.device_status & VIRTIO_CONFIG_S_DRIVER_OK))
- errx(1, "%s: notify before VIRTIO_CONFIG_S_DRIVER_OK",
- d->name);
+ bad_driver(d, "notify before VIRTIO_CONFIG_S_DRIVER_OK");
goto read_through16;
case offsetof(struct virtio_pci_mmio, isr):
if (mask != 0xFF)
- errx(1, "%s: non-8-bit read from offset %u (%#x)",
- d->name, off, getreg(eip));
+ bad_driver(d, "non-8-bit read from offset %u (%#x)",
+ off, getreg(eip));
isr = d->mmio->isr;
/*
* 4.1.4.5.1:
d->mmio->isr = 0;
return isr;
case offsetof(struct virtio_pci_mmio, padding):
- errx(1, "%s: read from padding (%#x)",
- d->name, getreg(eip));
+ bad_driver(d, "read from padding (%#x)", getreg(eip));
default:
/* Read from device config space, beware unaligned overflow */
if (off > d->mmio_size - 4)
- errx(1, "%s: read past end (%#x)",
- d->name, getreg(eip));
+ bad_driver(d, "read past end (%#x)", getreg(eip));
/*
* 3.1.1:
* that it can support the device before accepting it.
*/
if (!(d->mmio->cfg.device_status & VIRTIO_CONFIG_S_DRIVER))
- errx(1, "%s: config read before VIRTIO_CONFIG_S_DRIVER",
- d->name);
+ bad_driver(d,
+ "config read before VIRTIO_CONFIG_S_DRIVER");
if (mask == 0xFFFFFFFF)
goto read_through32;
*/
read_through32:
if (mask != 0xFFFFFFFF)
- errx(1, "%s: non-32-bit read to offset %u (%#x)",
- d->name, off, getreg(eip));
+ bad_driver(d, "non-32-bit read to offset %u (%#x)",
+ off, getreg(eip));
memcpy(&val, (char *)d->mmio + off, 4);
return val;
read_through16:
if (mask != 0xFFFF)
- errx(1, "%s: non-16-bit read to offset %u (%#x)",
- d->name, off, getreg(eip));
+ bad_driver(d, "non-16-bit read to offset %u (%#x)",
+ off, getreg(eip));
memcpy(&val, (char *)d->mmio + off, 2);
return val;
read_through8:
if (mask != 0xFF)
- errx(1, "%s: non-8-bit read to offset %u (%#x)",
- d->name, off, getreg(eip));
+ bad_driver(d, "non-8-bit read to offset %u (%#x)",
+ off, getreg(eip));
memcpy(&val, (char *)d->mmio + off, 1);
return val;
}
head = wait_for_vq_desc(vq, iov, &out_num, &in_num);
/* Copy the output header from the front of the iov (adjusts iov) */
- iov_consume(iov, out_num, &out, sizeof(out));
+ iov_consume(vq->dev, iov, out_num, &out, sizeof(out));
/* Find and trim end of iov input array, for our status byte. */
in = NULL;
}
}
if (!in)
- errx(1, "Bad virtblk cmd with no room for status");
+ bad_driver_vq(vq, "Bad virtblk cmd with no room for status");
/*
* For historical reasons, block operations are expressed in 512 byte
/* Trim it back to the correct length */
ftruncate64(vblk->fd, vblk->len);
/* Die, bad Guest, die. */
- errx(1, "Write past end %llu+%u", off, ret);
+ bad_driver_vq(vq, "Write past end %llu+%u", off, ret);
}
wlen = sizeof(*in);
/* First we need a buffer from the Guests's virtqueue. */
head = wait_for_vq_desc(vq, iov, &out_num, &in_num);
if (out_num)
- errx(1, "Output buffers in rng?");
+ bad_driver_vq(vq, "Output buffers in rng?");
/*
* Just like the console write, we loop to cover the whole iovec.
len = readv(rng_info->rfd, iov, in_num);
if (len <= 0)
err(1, "Read from /dev/urandom gave %i", len);
- iov_consume(iov, in_num, NULL, len);
+ iov_consume(vq->dev, iov, in_num, NULL, len);
totlen += len;
}
git.samba.org / sfrench / cifs-2.6.git / blobdiff