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...eature bits. > > Signed-off-by: Michael S. Tsirkin <mst at redhat.com> > --- > drivers/s390/kvm/virtio_ccw.c | 13 ++++++++++--- > 1 file changed, 10 insertions(+), 3 deletions(-) > > diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c > index 4a3e6e5..088bdf1 100644 > --- a/drivers/s390/kvm/virtio_ccw.c > +++ b/drivers/s390/kvm/virtio_ccw.c > @@ -733,6 +733,9 @@ static u64 virtio_ccw_get_features(struct virtio_device *vdev) > > rc = le32_to_cpu(features->features); > > + if (vcdev->revision == 0) > + goto out_...

...eature bits. > > Signed-off-by: Michael S. Tsirkin <mst at redhat.com> > --- > drivers/s390/kvm/virtio_ccw.c | 13 ++++++++++--- > 1 file changed, 10 insertions(+), 3 deletions(-) > > diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c > index 4a3e6e5..088bdf1 100644 > --- a/drivers/s390/kvm/virtio_ccw.c > +++ b/drivers/s390/kvm/virtio_ccw.c > @@ -733,6 +733,9 @@ static u64 virtio_ccw_get_features(struct virtio_device *vdev) > > rc = le32_to_cpu(features->features); > > + if (vcdev->revision == 0) > + goto out_...

transports need to be able to detect legacy-only devices (ATM balloon only) to use legacy path to drive them. Add a core API to do just that. The implementation just blacklists balloon: not too pretty, but let's not over-engineer. Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- include/linux/virtio.h | 2 ++ drivers/virtio/virtio.c | 6 ++++++ 2 files changed, 8

transports need to be able to detect legacy-only devices (ATM balloon only) to use legacy path to drive them. Add a core API to do just that. The implementation just blacklists balloon: not too pretty, but let's not over-engineer. Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- include/linux/virtio.h | 2 ++ drivers/virtio/virtio.c | 6 ++++++ 2 files changed, 8

...VIRTIO_F_VERSION_1 by not reading high feature bits. Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- drivers/s390/kvm/virtio_ccw.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c index 4a3e6e5..088bdf1 100644 --- a/drivers/s390/kvm/virtio_ccw.c +++ b/drivers/s390/kvm/virtio_ccw.c @@ -733,6 +733,9 @@ static u64 virtio_ccw_get_features(struct virtio_device *vdev) rc = le32_to_cpu(features->features); + if (vcdev->revision == 0) + goto out_free; + /* Read second half of the f...

...VIRTIO_F_VERSION_1 by not reading high feature bits. Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- drivers/s390/kvm/virtio_ccw.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c index 4a3e6e5..088bdf1 100644 --- a/drivers/s390/kvm/virtio_ccw.c +++ b/drivers/s390/kvm/virtio_ccw.c @@ -733,6 +733,9 @@ static u64 virtio_ccw_get_features(struct virtio_device *vdev) rc = le32_to_cpu(features->features); + if (vcdev->revision == 0) + goto out_free; + /* Read second half of the f...

transports need to be able to detect legacy-only devices (ATM balloon only) to use legacy path to drive them. Add a core API to do just that. The implementation just blacklists balloon: not too pretty, but let's not over-engineer. Signed-off-by: Michael S. Tsirkin <mst at redhat.com> Acked-by: Cornelia Huck <cornelia.huck at de.ibm.com> --- include/linux/virtio.h | 2 ++

transports need to be able to detect legacy-only devices (ATM balloon only) to use legacy path to drive them. Add a core API to do just that. The implementation just blacklists balloon: not too pretty, but let's not over-engineer. Signed-off-by: Michael S. Tsirkin <mst at redhat.com> Acked-by: Cornelia Huck <cornelia.huck at de.ibm.com> --- include/linux/virtio.h | 2 ++