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virtio,vhost: fixes

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Add a feature flag for new protocol messages.
 Misc fixes.
 
 Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

virtio,vhost: fixes

Add a feature flag for new protocol messages.
Misc fixes.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

# gpg: Signature made Mon 09 Apr 2018 15:37:29 BST
# gpg:                using RSA key 281F0DB8D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>"
# Primary key fingerprint: 0270 606B 6F3C DF3D 0B17  0970 C350 3912 AFBE 8E67
#      Subkey fingerprint: 5D09 FD08 71C8 F85B 94CA  8A0D 281F 0DB8 D28D 5469

* remotes/mst/tags/for_upstream:
  virtio-serial: fix heap-over-flow
  vhost: Allow adjoining regions
  contrib/libvhost-user: add the protocol feature used for SET/GET message
  vhost-user: back SET/GET_CONFIG requests with a protocol feature
  vhost-user-blk: set config ops before vhost-user init

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2018-04-09 16:25:38 +01:00
commit a84e937649
6 changed files with 51 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
contrib/libvhost-user/libvhost-user.h
View File

@ -50,6 +50,7 @@ enum VhostUserProtocolFeature {
VHOST_USER_PROTOCOL_F_CROSS_ENDIAN = 6,
VHOST_USER_PROTOCOL_F_CRYPTO_SESSION = 7,
VHOST_USER_PROTOCOL_F_PAGEFAULT = 8,
VHOST_USER_PROTOCOL_F_CONFIG = 9,
VHOST_USER_PROTOCOL_F_MAX
};

21
docs/interop/vhost-user.txt
View File

@ -379,6 +379,7 @@ Protocol features
#define VHOST_USER_PROTOCOL_F_CROSS_ENDIAN 6
#define VHOST_USER_PROTOCOL_F_CRYPTO_SESSION 7
#define VHOST_USER_PROTOCOL_F_PAGEFAULT 8
#define VHOST_USER_PROTOCOL_F_CONFIG 9
Master message types
--------------------
@ -664,7 +665,8 @@ Master message types
Master payload: virtio device config space
Slave payload: virtio device config space
Submitted by the vhost-user master to fetch the contents of the virtio
When VHOST_USER_PROTOCOL_F_CONFIG is negotiated, this message is
submitted by the vhost-user master to fetch the contents of the virtio
device configuration space, vhost-user slave's payload size MUST match
master's request, vhost-user slave uses zero length of payload to
indicate an error to vhost-user master. The vhost-user master may
@ -677,7 +679,8 @@ Master message types
Master payload: virtio device config space
Slave payload: N/A
Submitted by the vhost-user master when the Guest changes the virtio
When VHOST_USER_PROTOCOL_F_CONFIG is negotiated, this message is
submitted by the vhost-user master when the Guest changes the virtio
device configuration space and also can be used for live migration
on the destination host. The vhost-user slave must check the flags
field, and slaves MUST NOT accept SET_CONFIG for read-only
@ -766,13 +769,13 @@ Slave message types
Slave payload: N/A
Master payload: N/A
Vhost-user slave sends such messages to notify that the virtio device's
configuration space has changed, for those host devices which can support
such feature, host driver can send VHOST_USER_GET_CONFIG message to slave
to get the latest content. If VHOST_USER_PROTOCOL_F_REPLY_ACK is
negotiated, and slave set the VHOST_USER_NEED_REPLY flag, master must
respond with zero when operation is successfully completed, or non-zero
otherwise.
When VHOST_USER_PROTOCOL_F_CONFIG is negotiated, vhost-user slave sends
such messages to notify that the virtio device's configuration space has
changed, for those host devices which can support such feature, host
driver can send VHOST_USER_GET_CONFIG message to slave to get the latest
content. If VHOST_USER_PROTOCOL_F_REPLY_ACK is negotiated, and slave set
the VHOST_USER_NEED_REPLY flag, master must respond with zero when
operation is successfully completed, or non-zero otherwise.
VHOST_USER_PROTOCOL_F_REPLY_ACK:
-------------------------------

4
hw/block/vhost-user-blk.c
View File

@ -259,6 +259,8 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
s->dev.vq_index = 0;
s->dev.backend_features = 0;
vhost_dev_set_config_notifier(&s->dev, &blk_ops);
ret = vhost_dev_init(&s->dev, &s->chardev, VHOST_BACKEND_TYPE_USER, 0);
if (ret < 0) {
error_setg(errp, "vhost-user-blk: vhost initialization failed: %s",
@ -277,8 +279,6 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
s->blkcfg.num_queues = s->num_queues;
}
vhost_dev_set_config_notifier(&s->dev, &blk_ops);
return;
vhost_err:

7
hw/char/virtio-serial-bus.c
View File

@ -580,13 +580,16 @@ static void set_config(VirtIODevice *vdev, const uint8_t *config_data)
VirtIOSerial *vser = VIRTIO_SERIAL(vdev);
struct virtio_console_config *config =
(struct virtio_console_config *)config_data;
uint8_t emerg_wr_lo = le32_to_cpu(config->emerg_wr);
VirtIOSerialPort *port = find_first_connected_console(vser);
VirtIOSerialPortClass *vsc;
uint8_t emerg_wr_lo;
if (!config->emerg_wr) {
if (!virtio_has_feature(vser->host_features,
VIRTIO_CONSOLE_F_EMERG_WRITE) || !config->emerg_wr) {
return;
}
emerg_wr_lo = le32_to_cpu(config->emerg_wr);
/* Make sure we don't misdetect an emergency write when the guest
* does a short config write after an emergency write. */
config->emerg_wr = 0;

22
hw/virtio/vhost-user.c
View File

@ -46,6 +46,7 @@ enum VhostUserProtocolFeature {
VHOST_USER_PROTOCOL_F_CROSS_ENDIAN = 6,
VHOST_USER_PROTOCOL_F_CRYPTO_SESSION = 7,
VHOST_USER_PROTOCOL_F_PAGEFAULT = 8,
VHOST_USER_PROTOCOL_F_CONFIG = 9,
VHOST_USER_PROTOCOL_F_MAX
};
@ -1211,6 +1212,17 @@ static int vhost_user_init(struct vhost_dev *dev, void *opaque)
dev->protocol_features =
protocol_features & VHOST_USER_PROTOCOL_FEATURE_MASK;
if (!dev->config_ops || !dev->config_ops->vhost_dev_config_notifier) {
/* Don't acknowledge CONFIG feature if device doesn't support it */
dev->protocol_features &= ~(1ULL << VHOST_USER_PROTOCOL_F_CONFIG);
} else if (!(protocol_features &
(1ULL << VHOST_USER_PROTOCOL_F_CONFIG))) {
error_report("Device expects VHOST_USER_PROTOCOL_F_CONFIG "
"but backend does not support it.");
return -1;
}
err = vhost_user_set_protocol_features(dev, dev->protocol_features);
if (err < 0) {
return err;
@ -1405,6 +1417,11 @@ static int vhost_user_get_config(struct vhost_dev *dev, uint8_t *config,
.hdr.size = VHOST_USER_CONFIG_HDR_SIZE + config_len,
};
if (!virtio_has_feature(dev->protocol_features,
VHOST_USER_PROTOCOL_F_CONFIG)) {
return -1;
}
if (config_len > VHOST_USER_MAX_CONFIG_SIZE) {
return -1;
}
@ -1448,6 +1465,11 @@ static int vhost_user_set_config(struct vhost_dev *dev, const uint8_t *data,
.hdr.size = VHOST_USER_CONFIG_HDR_SIZE + size,
};
if (!virtio_has_feature(dev->protocol_features,
VHOST_USER_PROTOCOL_F_CONFIG)) {
return -1;
}
if (reply_supported) {
msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK;
}

14
hw/virtio/vhost.c
View File

@ -595,10 +595,15 @@ static void vhost_region_add_section(struct vhost_dev *dev,
prev_sec->offset_within_address_space,
prev_sec->offset_within_region);
} else {
error_report("%s: Overlapping but not coherent sections "
"at %"PRIx64,
__func__, mrs_gpa);
return;
/* adjoining regions are fine, but overlapping ones with
* different blocks/offsets shouldn't happen
*/
if (mrs_gpa != prev_gpa_end + 1) {
error_report("%s: Overlapping but not coherent sections "
"at %"PRIx64,
__func__, mrs_gpa);
return;
}
}
}
}
@ -1451,7 +1456,6 @@ int vhost_dev_set_config(struct vhost_dev *hdev, const uint8_t *data,
void vhost_dev_set_config_notifier(struct vhost_dev *hdev,
const VhostDevConfigOps *ops)
{
assert(hdev->vhost_ops);
hdev->config_ops = ops;
}