[PATCH v5 03/45] virtio: add support for 64 bit features.

Michael S. Tsirkin
2014-11-27T12:30:11Z

From: Rusty Russell <rusty@rustcorp.com.au>

Change the u32 to a u64, and make sure to use 1ULL
in all devices.

Note: transports are unchanged, and only set low 32 bit.
This ensures that no transport sets e.g. VERSION_1
by mistake without proper support.

MST: drop most transport-specific changes.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
include/linux/virtio.h | 2 +-
include/linux/virtio_config.h | 8 ++++----
tools/virtio/linux/virtio.h | 2 +-
tools/virtio/linux/virtio_config.h | 2 +-
drivers/char/virtio_console.c | 2 +-
drivers/lguest/lguest_device.c | 2 +-
drivers/misc/mic/card/mic_virtio.c | 2 +-
drivers/remoteproc/remoteproc_virtio.c | 2 +-
drivers/s390/kvm/kvm_virtio.c | 2 +-
drivers/s390/kvm/virtio_ccw.c | 2 +-
drivers/virtio/virtio.c | 12 ++++++------
drivers/virtio/virtio_mmio.c | 2 +-
drivers/virtio/virtio_pci.c | 2 +-
drivers/virtio/virtio_ring.c | 2 +-
14 files changed, 22 insertions(+), 22 deletions(-)

diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 7828a7f..149284e 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -101,7 +101,7 @@ struct virtio_device {
const struct virtio_config_ops *config;
const struct vringh_config_ops *vringh_config;
struct list_head vqs;
- u32 features;
+ u64 features;
void *priv;
};

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index aa84d0e..022d904 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -66,7 +66,7 @@ struct virtio_config_ops {
vq_callback_t *callbacks[],
const char *names[]);
void (*del_vqs)(struct virtio_device *);
- u32 (*get_features)(struct virtio_device *vdev);
+ u64 (*get_features)(struct virtio_device *vdev);
void (*finalize_features)(struct virtio_device *vdev);
const char *(*bus_name)(struct virtio_device *vdev);
int (*set_vq_affinity)(struct virtqueue *vq, int cpu);
@@ -86,14 +86,14 @@ static inline bool virtio_has_feature(const struct virtio_device *vdev,
{
/* Did you forget to fix assumptions on max features? */
if (__builtin_constant_p(fbit))
- BUILD_BUG_ON(fbit >= 32);
+ BUILD_BUG_ON(fbit >= 64);
else
- BUG_ON(fbit >= 32);
+ BUG_ON(fbit >= 64);

if (fbit < VIRTIO_TRANSPORT_F_START)
virtio_check_driver_offered_feature(vdev, fbit);

- return vdev->features & (1 << fbit);
+ return vdev->features & (1ULL << fbit);
}

static inline
diff --git a/tools/virtio/linux/virtio.h b/tools/virtio/linux/virtio.h
index 72bff70..8eb6421 100644
--- a/tools/virtio/linux/virtio.h
+++ b/tools/virtio/linux/virtio.h
@@ -10,7 +10,7 @@

struct virtio_device {
void *dev;
- u32 features;
+ u64 features;
};

struct virtqueue {
diff --git a/tools/virtio/linux/virtio_config.h b/tools/virtio/linux/virtio_config.h
index 1f1636b..a254c2b 100644
--- a/tools/virtio/linux/virtio_config.h
+++ b/tools/virtio/linux/virtio_config.h
@@ -2,5 +2,5 @@
#define VIRTIO_TRANSPORT_F_END 32

#define virtio_has_feature(dev, feature) \
- ((dev)->features & (1 << feature))
+ ((dev)->features & (1ULL << feature))

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 0074f9b..fda9a75 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -355,7 +355,7 @@ static inline bool use_multiport(struct ports_device *portdev)
*/
if (!portdev->vdev)
return 0;
- return portdev->vdev->features & (1 << VIRTIO_CONSOLE_F_MULTIPORT);
+ return portdev->vdev->features & (1ULL << VIRTIO_CONSOLE_F_MULTIPORT);
}

static DEFINE_SPINLOCK(dma_bufs_lock);
diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
index c831c47..49d04d5 100644
--- a/drivers/lguest/lguest_device.c
+++ b/drivers/lguest/lguest_device.c
@@ -94,7 +94,7 @@ static unsigned desc_size(const struct lguest_device_desc *desc)
}

/* This gets the device's feature bits. */
-static u32 lg_get_features(struct virtio_device *vdev)
+static u64 lg_get_features(struct virtio_device *vdev)
{
unsigned int i;
u32 features = 0;
diff --git a/drivers/misc/mic/card/mic_virtio.c b/drivers/misc/mic/card/mic_virtio.c
index 2a6bc3f..d037f57 100644
--- a/drivers/misc/mic/card/mic_virtio.c
+++ b/drivers/misc/mic/card/mic_virtio.c
@@ -68,7 +68,7 @@ static inline struct device *mic_dev(struct mic_vdev *mvdev)
}

/* This gets the device's feature bits. */
-static u32 mic_get_features(struct virtio_device *vdev)
+static u64 mic_get_features(struct virtio_device *vdev)
{
unsigned int i, bits;
u32 features = 0;
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index dafaf38..62897db 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -207,7 +207,7 @@ static void rproc_virtio_reset(struct virtio_device *vdev)
}

/* provide the vdev features as retrieved from the firmware */
-static u32 rproc_virtio_get_features(struct virtio_device *vdev)
+static u64 rproc_virtio_get_features(struct virtio_device *vdev)
{
struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
struct fw_rsc_vdev *rsc;
diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index ac79a09..1455a9a 100644
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -80,7 +80,7 @@ static unsigned desc_size(const struct kvm_device_desc *desc)
}

/* This gets the device's feature bits. */
-static u32 kvm_get_features(struct virtio_device *vdev)
+static u64 kvm_get_features(struct virtio_device *vdev)
{
unsigned int i;
u32 features = 0;
diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c
index 1dbee95..56d7895 100644
--- a/drivers/s390/kvm/virtio_ccw.c
+++ b/drivers/s390/kvm/virtio_ccw.c
@@ -660,7 +660,7 @@ static void virtio_ccw_reset(struct virtio_device *vdev)
kfree(ccw);
}

-static u32 virtio_ccw_get_features(struct virtio_device *vdev)
+static u64 virtio_ccw_get_features(struct virtio_device *vdev)
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
struct virtio_feature_desc *features;
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index 7814b1f..d213567 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -159,7 +159,7 @@ static int virtio_dev_probe(struct device *_d)
int err, i;
struct virtio_device *dev = dev_to_virtio(_d);
struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);
- u32 device_features;
+ u64 device_features;

/* We have a driver! */
add_status(dev, VIRTIO_CONFIG_S_DRIVER);
@@ -171,15 +171,15 @@ static int virtio_dev_probe(struct device *_d)
dev->features = 0;
for (i = 0; i < drv->feature_table_size; i++) {
unsigned int f = drv->feature_table[i];
- BUG_ON(f >= 32);
- if (device_features & (1 << f))
- dev->features |= (1 << f);
+ BUG_ON(f >= 64);
+ if (device_features & (1ULL << f))
+ dev->features |= (1ULL << f);
}

/* Transport features always preserved to pass to finalize_features. */
for (i = VIRTIO_TRANSPORT_F_START; i < VIRTIO_TRANSPORT_F_END; i++)
- if (device_features & (1 << i))
- dev->features |= (1 << i);
+ if (device_features & (1ULL << i))
+ dev->features |= (1ULL << i);

dev->config->finalize_features(dev);

diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index eb5b0e2..c63d0ef 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -142,7 +142,7 @@ struct virtio_mmio_vq_info {

/* Configuration interface */

-static u32 vm_get_features(struct virtio_device *vdev)
+static u64 vm_get_features(struct virtio_device *vdev)
{
struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);

diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index ab95a4c..80be24a 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -102,7 +102,7 @@ static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev)
}

/* virtio config->get_features() implementation */
-static u32 vp_get_features(struct virtio_device *vdev)
+static u64 vp_get_features(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 15a8a05..61a1fe1 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -781,7 +781,7 @@ void vring_transport_features(struct virtio_device *vdev)
break;
default:
/* We don't understand this bit. */
- vdev->features &= ~(1 << i);
+ vdev->features &= ~(1ULL << i);
}
}
}
--
MST