On Fri, 24 Oct 2014 00:42:20 +0300
"Michael S. Tsirkin" <mst@xxxxxxxxxx> wrote:
> On Tue, Oct 07, 2014 at 04:39:56PM +0200, Cornelia Huck wrote:
> > This patchset aims to get us some way to implement virtio-1 compliant
> > and transitional devices in qemu. Branch available at
> >
> > git://github.com/cohuck/qemu virtio-1
> >
> > I've mainly focused on:
> > - endianness handling
> > - extended feature bits
> > - virtio-ccw new/changed commands
>
> So issues identified so far:
Thanks for taking a look.
> - devices not converted yet should not advertize 1.0
Neither should an uncoverted transport. So we either can
- have transport set the bit and rely on devices ->get_features
callback to mask it out
(virtio-ccw has to change the calling order for get_features, btw.)
- have device set the bit and the transport mask it out later. Feels a
bit weird, as virtio-1 is a transport feature bit.
I'm tending towards the first option; smth like this (on top of my
branch):
diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
index c29c8c8..f6501ea 100644
--- a/hw/9pfs/virtio-9p-device.c
+++ b/hw/9pfs/virtio-9p-device.c
@@ -24,6 +24,9 @@
static uint32_t virtio_9p_get_features(VirtIODevice *vdev, unsigned int index,
uint32_t features)
{
+ if (index == 1) {
+ features &= ~(1 << (VIRTIO_F_VERSION_1 - 32));
+ }
if (index > 0) {
return features;
}
diff --git a/hw/char/virtio-serial-bus.c b/hw/char/virtio-serial-bus.c
index 0d843fe..07a7a6f 100644
--- a/hw/char/virtio-serial-bus.c
+++ b/hw/char/virtio-serial-bus.c
@@ -472,6 +472,9 @@ static uint32_t get_features(VirtIODevice *vdev, unsigned int index,
{
VirtIOSerial *vser;
+ if (index == 1) {
+ features &= ~(1 << (VIRTIO_F_VERSION_1 - 32));
+ }
if (index > 0) {
return features;
}
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 67f91c0..4b75105 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -447,6 +447,9 @@ static uint32_t virtio_net_get_features(VirtIODevice *vdev, unsigned int index,
VirtIONet *n = VIRTIO_NET(vdev);
NetClientState *nc = qemu_get_queue(n->nic);
+ if (index == 1 && get_vhost_net(nc->peer)) {
+ features &= ~(1 << (VIRTIO_F_VERSION_1 - 32));
+ }
if (index > 0) {
return features;
}
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index 80efe88..07fbf40 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -839,16 +839,16 @@ static int virtio_ccw_device_init(VirtioCcwDevice *dev, VirtIODevice *vdev)
dev->revision = -1;
/* Set default feature bits that are offered by the host. */
+ dev->host_features[0] = 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
+ dev->host_features[0] |= 0x1 << VIRTIO_F_BAD_FEATURE;
+
+ dev->host_features[1] = 1 << (VIRTIO_F_VERSION_1 - 32);
+
for (i = 0; i < ARRAY_SIZE(dev->host_features); i++) {
dev->host_features[i] =
virtio_bus_get_vdev_features(&dev->bus, i, dev->host_features[i]);
}
- dev->host_features[0] |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
- dev->host_features[0] |= 0x1 << VIRTIO_F_BAD_FEATURE;
-
- dev->host_features[1] = 1 << (VIRTIO_F_VERSION_1 - 32);
-
css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
parent->hotplugged, 1);
return 0;
diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c
index 8e1afa0..8a8fdb9 100644
--- a/hw/scsi/vhost-scsi.c
+++ b/hw/scsi/vhost-scsi.c
@@ -155,6 +155,9 @@ static uint32_t vhost_scsi_get_features(VirtIODevice *vdev, unsigned int index,
{
VHostSCSI *s = VHOST_SCSI(vdev);
+ if (index == 1) {
+ features &= ~(1 << (VIRTIO_F_VERSION_1 - 32));
+ }
if (index > 0) {
return features;
}
diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
index 088e688..378783f 100644
--- a/hw/scsi/virtio-scsi.c
+++ b/hw/scsi/virtio-scsi.c
@@ -611,6 +611,9 @@ static void virtio_scsi_set_config(VirtIODevice *vdev,
static uint32_t virtio_scsi_get_features(VirtIODevice *vdev, unsigned int index,
uint32_t requested_features)
{
+ if (index == 1) {
+ requested_features &= ~(1 << (VIRTIO_F_VERSION_1 - 32));
+ }
return requested_features;
}
diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c
index 5af17e2..bd52845 100644
--- a/hw/virtio/virtio-balloon.c
+++ b/hw/virtio/virtio-balloon.c
@@ -306,6 +306,9 @@ static void virtio_balloon_set_config(VirtIODevice *vdev,
static uint32_t virtio_balloon_get_features(VirtIODevice *vdev,
unsigned int index, uint32_t f)
{
+ if (index == 1) {
+ f &= ~(1 << (VIRTIO_F_VERSION_1 - 32));
+ }
if (index > 0) {
return f;
}
diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
index 2814017..bf6101d 100644
--- a/hw/virtio/virtio-rng.c
+++ b/hw/virtio/virtio-rng.c
@@ -101,6 +101,9 @@ static void handle_input(VirtIODevice *vdev, VirtQueue *vq)
static uint32_t get_features(VirtIODevice *vdev, unsigned int index, uint32_t f)
{
+ if (index == 1) {
+ f &= ~(1 << (VIRTIO_F_VERSION_1 - 32));
+ }
return f;
}
> - blk has some features removed under 1.0,
> specifically CONFIG_WCE.
> - net header is different for 1.0
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