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virtio-ccw: enable virtio-1 

Let's enable revision 1 for virtio-ccw devices. We can always offer
VERSION_1 as drivers in legacy mode won't be able to see it anyway.

We have to introduce a way to set a lower maximum revision for a device
to accommodate the following cases:
- compat machines (to enforce legacy only)
- virtio-blk with scsi support (version 1 + scsi is fenced by common
  code, with a user-configured max revision of 0 we can allow scsi
  via not offering VERSION_1)

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Cornelia Huck 2015-09-11 15:16:44 +02:00 committed by Michael S. Tsirkin
parent b4f8f9df15
commit 542571d523
3 changed files with 52 additions and 4 deletions
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20
hw/s390x/s390-virtio-ccw.c
View File

@ -242,6 +242,26 @@ static const TypeInfo ccw_machine_info = {
.driver = TYPE_S390_SKEYS,\
.property = "migration-enabled",\
.value = "off",\
},{\
.driver = "virtio-blk-ccw",\
.property = "max_revision",\
.value = "0",\
},{\
.driver = "virtio-balloon-ccw",\
.property = "max_revision",\
.value = "0",\
},{\
.driver = "virtio-serial-ccw",\
.property = "max_revision",\
.value = "0",\
},{\
.driver = "virtio-9p-ccw",\
.property = "max_revision",\
.value = "0",\
},{\
.driver = "virtio-rng-ccw",\
.property = "max_revision",\
.value = "0",\
},
static void ccw_machine_2_4_class_init(ObjectClass *oc, void *data)

30
hw/s390x/virtio-ccw.c
View File

@ -467,7 +467,13 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
MEMTXATTRS_UNSPECIFIED,
NULL);
if (features.index == 0) {
features.features = (uint32_t)vdev->host_features;
if (dev->revision >= 1) {
/* Don't offer legacy features for modern devices. */
features.features = (uint32_t)
(vdev->host_features & ~VIRTIO_LEGACY_FEATURES);
} else {
features.features = (uint32_t)vdev->host_features;
}
} else if ((features.index == 1) && (dev->revision >= 1)) {
/*
* Only offer feature bits beyond 31 if the guest has
@ -768,7 +774,7 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
* need to fetch it here. Nothing to do for now, though.
*/
if (dev->revision >= 0 ||
revinfo.revision > virtio_ccw_rev_max(vdev)) {
revinfo.revision > virtio_ccw_rev_max(dev)) {
ret = -ENOSYS;
break;
}
@ -1541,6 +1547,10 @@ static void virtio_ccw_device_plugged(DeviceState *d, Error **errp)
sch->id.cu_model = virtio_bus_get_vdev_id(&dev->bus);
if (dev->max_rev >= 1) {
virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1);
}
css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
d->hotplugged, 1);
}
@ -1557,6 +1567,8 @@ static Property virtio_ccw_net_properties[] = {
DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev,
VIRTIO_CCW_MAX_REV),
DEFINE_PROP_END_OF_LIST(),
};
@ -1584,6 +1596,8 @@ static Property virtio_ccw_blk_properties[] = {
DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev,
VIRTIO_CCW_MAX_REV),
DEFINE_PROP_END_OF_LIST(),
};
@ -1611,6 +1625,8 @@ static Property virtio_ccw_serial_properties[] = {
DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev,
VIRTIO_CCW_MAX_REV),
DEFINE_PROP_END_OF_LIST(),
};
@ -1638,6 +1654,8 @@ static Property virtio_ccw_balloon_properties[] = {
DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev,
VIRTIO_CCW_MAX_REV),
DEFINE_PROP_END_OF_LIST(),
};
@ -1665,6 +1683,8 @@ static Property virtio_ccw_scsi_properties[] = {
DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev,
VIRTIO_CCW_MAX_REV),
DEFINE_PROP_END_OF_LIST(),
};
@ -1691,6 +1711,8 @@ static const TypeInfo virtio_ccw_scsi = {
#ifdef CONFIG_VHOST_SCSI
static Property vhost_ccw_scsi_properties[] = {
DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev,
VIRTIO_CCW_MAX_REV),
DEFINE_PROP_END_OF_LIST(),
};
@ -1729,6 +1751,8 @@ static Property virtio_ccw_rng_properties[] = {
DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev,
VIRTIO_CCW_MAX_REV),
DEFINE_PROP_END_OF_LIST(),
};
@ -1882,6 +1906,8 @@ static Property virtio_ccw_9p_properties[] = {
DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev,
VIRTIO_CCW_MAX_REV),
DEFINE_PROP_END_OF_LIST(),
};

6
hw/s390x/virtio-ccw.h
View File

@ -88,6 +88,7 @@ struct VirtioCcwDevice {
SubchDev *sch;
char *bus_id;
int revision;
uint32_t max_rev;
VirtioBusState bus;
bool ioeventfd_started;
bool ioeventfd_disabled;
@ -102,9 +103,10 @@ struct VirtioCcwDevice {
};
/* The maximum virtio revision we support. */
static inline int virtio_ccw_rev_max(VirtIODevice *vdev)
#define VIRTIO_CCW_MAX_REV 1
static inline int virtio_ccw_rev_max(VirtioCcwDevice *dev)
{
return 0;
return dev->max_rev;
}
/* virtual css bus type */