diff options
Diffstat (limited to 'Documentation/lguest/lguest.c')
| -rw-r--r-- | Documentation/lguest/lguest.c | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c index d36fcc0f271..e65d6cbf241 100644 --- a/Documentation/lguest/lguest.c +++ b/Documentation/lguest/lguest.c @@ -126,9 +126,13 @@ struct device /* The linked-list pointer. */ struct device *next; - /* The this device's descriptor, as mapped into the Guest. */ + /* The device's descriptor, as mapped into the Guest. */ struct lguest_device_desc *desc; + /* We can't trust desc values once Guest has booted: we use these. */ + unsigned int feature_len; + unsigned int num_vq; + /* The name of this device, for --verbose. */ const char *name; @@ -245,7 +249,7 @@ static void iov_consume(struct iovec iov[], unsigned num_iov, unsigned len) static u8 *get_feature_bits(struct device *dev) { return (u8 *)(dev->desc + 1) - + dev->desc->num_vq * sizeof(struct lguest_vqconfig); + + dev->num_vq * sizeof(struct lguest_vqconfig); } /*L:100 The Launcher code itself takes us out into userspace, that scary place @@ -979,8 +983,8 @@ static void update_device_status(struct device *dev) verbose("Resetting device %s\n", dev->name); /* Clear any features they've acked. */ - memset(get_feature_bits(dev) + dev->desc->feature_len, 0, - dev->desc->feature_len); + memset(get_feature_bits(dev) + dev->feature_len, 0, + dev->feature_len); /* Zero out the virtqueues. */ for (vq = dev->vq; vq; vq = vq->next) { @@ -994,12 +998,12 @@ static void update_device_status(struct device *dev) unsigned int i; verbose("Device %s OK: offered", dev->name); - for (i = 0; i < dev->desc->feature_len; i++) + for (i = 0; i < dev->feature_len; i++) verbose(" %02x", get_feature_bits(dev)[i]); verbose(", accepted"); - for (i = 0; i < dev->desc->feature_len; i++) + for (i = 0; i < dev->feature_len; i++) verbose(" %02x", get_feature_bits(dev) - [dev->desc->feature_len+i]); + [dev->feature_len+i]); if (dev->ready) dev->ready(dev); @@ -1129,8 +1133,8 @@ static void handle_input(int fd) static u8 *device_config(const struct device *dev) { return (void *)(dev->desc + 1) - + dev->desc->num_vq * sizeof(struct lguest_vqconfig) - + dev->desc->feature_len * 2; + + dev->num_vq * sizeof(struct lguest_vqconfig) + + dev->feature_len * 2; } /* This routine allocates a new "struct lguest_device_desc" from descriptor @@ -1191,6 +1195,7 @@ static void add_virtqueue(struct device *dev, unsigned int num_descs, * yet, otherwise we'd be overwriting them. */ assert(dev->desc->config_len == 0 && dev->desc->feature_len == 0); memcpy(device_config(dev), &vq->config, sizeof(vq->config)); + dev->num_vq++; dev->desc->num_vq++; verbose("Virtqueue page %#lx\n", to_guest_phys(p)); @@ -1219,7 +1224,7 @@ static void add_feature(struct device *dev, unsigned bit) /* We can't extend the feature bits once we've added config bytes */ if (dev->desc->feature_len <= bit / CHAR_BIT) { assert(dev->desc->config_len == 0); - dev->desc->feature_len = (bit / CHAR_BIT) + 1; + dev->feature_len = dev->desc->feature_len = (bit/CHAR_BIT) + 1; } features[bit / CHAR_BIT] |= (1 << (bit % CHAR_BIT)); @@ -1259,6 +1264,8 @@ static struct device *new_device(const char *name, u16 type, int fd, dev->name = name; dev->vq = NULL; dev->ready = NULL; + dev->feature_len = 0; + dev->num_vq = 0; /* Append to device list. Prepending to a single-linked list is * easier, but the user expects the devices to be arranged on the bus |