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virtio: add and use virtio_set_features 

vdev->guest_features is not masking features that are not supported by
the guest.  Fix this by introducing a common wrapper to be used by all
virtio bus implementations.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Paolo Bonzini 2011-11-24 13:28:52 +01:00 committed by Anthony Liguori
parent ae0f940e6b
commit ad0c93328d
5 changed files with 23 additions and 20 deletions
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5
hw/s390-virtio-bus.c
View File

@ -254,10 +254,7 @@ void s390_virtio_device_update_status(VirtIOS390Device *dev)
/* Update guest supported feature bitmap */
features = bswap32(ldl_be_phys(dev->feat_offs));
if (vdev->set_features) {
vdev->set_features(vdev, features);
}
vdev->guest_features = features;
virtio_set_features(vdev, features);
}
VirtIOS390Device *s390_virtio_bus_console(VirtIOS390Bus *bus)

4
hw/syborg_virtio.c
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@ -131,9 +131,7 @@ static void syborg_virtio_writel(void *opaque, target_phys_addr_t offset,
}
switch (offset >> 2) {
case SYBORG_VIRTIO_GUEST_FEATURES:
if (vdev->set_features)
vdev->set_features(vdev, value);
vdev->guest_features = value;
virtio_set_features(vdev, value);
break;
case SYBORG_VIRTIO_QUEUE_BASE:
if (value == 0)

9
hw/virtio-pci.c
View File

@ -285,14 +285,9 @@ static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
case VIRTIO_PCI_GUEST_FEATURES:
/* Guest does not negotiate properly? We have to assume nothing. */
if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
if (vdev->bad_features)
val = proxy->host_features & vdev->bad_features(vdev);
else
val = 0;
val = vdev->bad_features ? vdev->bad_features(vdev) : 0;
}
if (vdev->set_features)
vdev->set_features(vdev, val);
vdev->guest_features = val;
virtio_set_features(vdev, val);
break;
case VIRTIO_PCI_QUEUE_PFN:
pa = (target_phys_addr_t)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;

24
hw/virtio.c
View File

@ -763,12 +763,25 @@ void virtio_save(VirtIODevice *vdev, QEMUFile *f)
}
}
int virtio_set_features(VirtIODevice *vdev, uint32_t val)
{
uint32_t supported_features =
vdev->binding->get_features(vdev->binding_opaque);
bool bad = (val & ~supported_features) != 0;
val &= supported_features;
if (vdev->set_features) {
vdev->set_features(vdev, val);
}
vdev->guest_features = val;
return bad ? -1 : 0;
}
int virtio_load(VirtIODevice *vdev, QEMUFile *f)
{
int num, i, ret;
uint32_t features;
uint32_t supported_features =
vdev->binding->get_features(vdev->binding_opaque);
uint32_t supported_features;
if (vdev->binding->load_config) {
ret = vdev->binding->load_config(vdev->binding_opaque, f);
@ -780,14 +793,13 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f)
qemu_get_8s(f, &vdev->isr);
qemu_get_be16s(f, &vdev->queue_sel);
qemu_get_be32s(f, &features);
if (features & ~supported_features) {
if (virtio_set_features(vdev, features) < 0) {
supported_features = vdev->binding->get_features(vdev->binding_opaque);
error_report("Features 0x%x unsupported. Allowed features: 0x%x",
features, supported_features);
return -1;
}
if (vdev->set_features)
vdev->set_features(vdev, features);
vdev->guest_features = features;
vdev->config_len = qemu_get_be32(f);
qemu_get_buffer(f, vdev->config, vdev->config_len);

1
hw/virtio.h
View File

@ -185,6 +185,7 @@ void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector);
void virtio_set_status(VirtIODevice *vdev, uint8_t val);
void virtio_reset(void *opaque);
void virtio_update_irq(VirtIODevice *vdev);
int virtio_set_features(VirtIODevice *vdev, uint32_t val);
void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding,
void *opaque);