Commit | Line | Data |
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2e04ef76 RR |
1 | /*P:050 |
2 | * Lguest guests use a very simple method to describe devices. It's a | |
a6bd8e13 | 3 | * series of device descriptors contained just above the top of normal Guest |
19f1537b RR |
4 | * memory. |
5 | * | |
6 | * We use the standard "virtio" device infrastructure, which provides us with a | |
7 | * console, a network and a block driver. Each one expects some configuration | |
2e04ef76 RR |
8 | * information and a "virtqueue" or two to send and receive data. |
9 | :*/ | |
19f1537b RR |
10 | #include <linux/init.h> |
11 | #include <linux/bootmem.h> | |
12 | #include <linux/lguest_launcher.h> | |
13 | #include <linux/virtio.h> | |
14 | #include <linux/virtio_config.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/virtio_ring.h> | |
17 | #include <linux/err.h> | |
18 | #include <asm/io.h> | |
19 | #include <asm/paravirt.h> | |
20 | #include <asm/lguest_hcall.h> | |
21 | ||
22 | /* The pointer to our (page) of device descriptions. */ | |
23 | static void *lguest_devices; | |
24 | ||
2e04ef76 RR |
25 | /* |
26 | * For Guests, device memory can be used as normal memory, so we cast away the | |
27 | * __iomem to quieten sparse. | |
28 | */ | |
19f1537b RR |
29 | static inline void *lguest_map(unsigned long phys_addr, unsigned long pages) |
30 | { | |
e27810f1 | 31 | return (__force void *)ioremap_cache(phys_addr, PAGE_SIZE*pages); |
19f1537b RR |
32 | } |
33 | ||
34 | static inline void lguest_unmap(void *addr) | |
35 | { | |
36 | iounmap((__force void __iomem *)addr); | |
37 | } | |
38 | ||
2e04ef76 RR |
39 | /*D:100 |
40 | * Each lguest device is just a virtio device plus a pointer to its entry | |
41 | * in the lguest_devices page. | |
42 | */ | |
19f1537b RR |
43 | struct lguest_device { |
44 | struct virtio_device vdev; | |
45 | ||
46 | /* The entry in the lguest_devices page for this device. */ | |
47 | struct lguest_device_desc *desc; | |
48 | }; | |
49 | ||
2e04ef76 RR |
50 | /* |
51 | * Since the virtio infrastructure hands us a pointer to the virtio_device all | |
19f1537b | 52 | * the time, it helps to have a curt macro to get a pointer to the struct |
2e04ef76 RR |
53 | * lguest_device it's enclosed in. |
54 | */ | |
25478445 | 55 | #define to_lgdev(vd) container_of(vd, struct lguest_device, vdev) |
19f1537b RR |
56 | |
57 | /*D:130 | |
58 | * Device configurations | |
59 | * | |
a586d4f6 | 60 | * The configuration information for a device consists of one or more |
a6bd8e13 | 61 | * virtqueues, a feature bitmap, and some configuration bytes. The |
6e5aa7ef | 62 | * configuration bytes don't really matter to us: the Launcher sets them up, and |
a586d4f6 | 63 | * the driver will look at them during setup. |
19f1537b | 64 | * |
a586d4f6 | 65 | * A convenient routine to return the device's virtqueue config array: |
2e04ef76 RR |
66 | * immediately after the descriptor. |
67 | */ | |
a586d4f6 RR |
68 | static struct lguest_vqconfig *lg_vq(const struct lguest_device_desc *desc) |
69 | { | |
70 | return (void *)(desc + 1); | |
71 | } | |
19f1537b | 72 | |
a586d4f6 RR |
73 | /* The features come immediately after the virtqueues. */ |
74 | static u8 *lg_features(const struct lguest_device_desc *desc) | |
75 | { | |
76 | return (void *)(lg_vq(desc) + desc->num_vq); | |
77 | } | |
19f1537b | 78 | |
a586d4f6 RR |
79 | /* The config space comes after the two feature bitmasks. */ |
80 | static u8 *lg_config(const struct lguest_device_desc *desc) | |
19f1537b | 81 | { |
a586d4f6 RR |
82 | return lg_features(desc) + desc->feature_len * 2; |
83 | } | |
19f1537b | 84 | |
a586d4f6 RR |
85 | /* The total size of the config page used by this device (incl. desc) */ |
86 | static unsigned desc_size(const struct lguest_device_desc *desc) | |
87 | { | |
88 | return sizeof(*desc) | |
89 | + desc->num_vq * sizeof(struct lguest_vqconfig) | |
90 | + desc->feature_len * 2 | |
91 | + desc->config_len; | |
92 | } | |
93 | ||
c45a6816 RR |
94 | /* This gets the device's feature bits. */ |
95 | static u32 lg_get_features(struct virtio_device *vdev) | |
a586d4f6 | 96 | { |
c45a6816 RR |
97 | unsigned int i; |
98 | u32 features = 0; | |
a586d4f6 | 99 | struct lguest_device_desc *desc = to_lgdev(vdev)->desc; |
c45a6816 RR |
100 | u8 *in_features = lg_features(desc); |
101 | ||
102 | /* We do this the slow but generic way. */ | |
103 | for (i = 0; i < min(desc->feature_len * 8, 32); i++) | |
104 | if (in_features[i / 8] & (1 << (i % 8))) | |
105 | features |= (1 << i); | |
106 | ||
107 | return features; | |
108 | } | |
109 | ||
2e04ef76 RR |
110 | /* |
111 | * The virtio core takes the features the Host offers, and copies the ones | |
112 | * supported by the driver into the vdev->features array. Once that's all | |
113 | * sorted out, this routine is called so we can tell the Host which features we | |
114 | * understand and accept. | |
115 | */ | |
c624896e | 116 | static void lg_finalize_features(struct virtio_device *vdev) |
c45a6816 | 117 | { |
c624896e | 118 | unsigned int i, bits; |
c45a6816 RR |
119 | struct lguest_device_desc *desc = to_lgdev(vdev)->desc; |
120 | /* Second half of bitmap is features we accept. */ | |
121 | u8 *out_features = lg_features(desc) + desc->feature_len; | |
122 | ||
e34f8725 RR |
123 | /* Give virtio_ring a chance to accept features. */ |
124 | vring_transport_features(vdev); | |
125 | ||
2e04ef76 RR |
126 | /* |
127 | * The vdev->feature array is a Linux bitmask: this isn't the same as a | |
128 | * the simple array of bits used by lguest devices for features. So we | |
129 | * do this slow, manual conversion which is completely general. | |
130 | */ | |
c45a6816 | 131 | memset(out_features, 0, desc->feature_len); |
c624896e RR |
132 | bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8; |
133 | for (i = 0; i < bits; i++) { | |
134 | if (test_bit(i, vdev->features)) | |
c45a6816 RR |
135 | out_features[i / 8] |= (1 << (i % 8)); |
136 | } | |
19f1537b RR |
137 | } |
138 | ||
139 | /* Once they've found a field, getting a copy of it is easy. */ | |
a586d4f6 | 140 | static void lg_get(struct virtio_device *vdev, unsigned int offset, |
19f1537b RR |
141 | void *buf, unsigned len) |
142 | { | |
a586d4f6 RR |
143 | struct lguest_device_desc *desc = to_lgdev(vdev)->desc; |
144 | ||
145 | /* Check they didn't ask for more than the length of the config! */ | |
146 | BUG_ON(offset + len > desc->config_len); | |
147 | memcpy(buf, lg_config(desc) + offset, len); | |
19f1537b RR |
148 | } |
149 | ||
150 | /* Setting the contents is also trivial. */ | |
a586d4f6 | 151 | static void lg_set(struct virtio_device *vdev, unsigned int offset, |
19f1537b RR |
152 | const void *buf, unsigned len) |
153 | { | |
a586d4f6 RR |
154 | struct lguest_device_desc *desc = to_lgdev(vdev)->desc; |
155 | ||
156 | /* Check they didn't ask for more than the length of the config! */ | |
157 | BUG_ON(offset + len > desc->config_len); | |
158 | memcpy(lg_config(desc) + offset, buf, len); | |
19f1537b RR |
159 | } |
160 | ||
2e04ef76 RR |
161 | /* |
162 | * The operations to get and set the status word just access the status field | |
163 | * of the device descriptor. | |
164 | */ | |
19f1537b RR |
165 | static u8 lg_get_status(struct virtio_device *vdev) |
166 | { | |
167 | return to_lgdev(vdev)->desc->status; | |
168 | } | |
169 | ||
2e04ef76 RR |
170 | /* |
171 | * To notify on status updates, we (ab)use the NOTIFY hypercall, with the | |
172 | * descriptor address of the device. A zero status means "reset". | |
173 | */ | |
a007a751 RR |
174 | static void set_status(struct virtio_device *vdev, u8 status) |
175 | { | |
176 | unsigned long offset = (void *)to_lgdev(vdev)->desc - lguest_devices; | |
177 | ||
178 | /* We set the status. */ | |
179 | to_lgdev(vdev)->desc->status = status; | |
4cd8b5e2 | 180 | kvm_hypercall1(LHCALL_NOTIFY, (max_pfn << PAGE_SHIFT) + offset); |
a007a751 RR |
181 | } |
182 | ||
19f1537b RR |
183 | static void lg_set_status(struct virtio_device *vdev, u8 status) |
184 | { | |
6e5aa7ef | 185 | BUG_ON(!status); |
a007a751 | 186 | set_status(vdev, status); |
19f1537b RR |
187 | } |
188 | ||
6e5aa7ef RR |
189 | static void lg_reset(struct virtio_device *vdev) |
190 | { | |
a007a751 | 191 | set_status(vdev, 0); |
6e5aa7ef RR |
192 | } |
193 | ||
19f1537b RR |
194 | /* |
195 | * Virtqueues | |
196 | * | |
197 | * The other piece of infrastructure virtio needs is a "virtqueue": a way of | |
198 | * the Guest device registering buffers for the other side to read from or | |
199 | * write into (ie. send and receive buffers). Each device can have multiple | |
e1e72965 RR |
200 | * virtqueues: for example the console driver uses one queue for sending and |
201 | * another for receiving. | |
19f1537b RR |
202 | * |
203 | * Fortunately for us, a very fast shared-memory-plus-descriptors virtqueue | |
204 | * already exists in virtio_ring.c. We just need to connect it up. | |
205 | * | |
206 | * We start with the information we need to keep about each virtqueue. | |
207 | */ | |
208 | ||
209 | /*D:140 This is the information we remember about each virtqueue. */ | |
210 | struct lguest_vq_info | |
211 | { | |
212 | /* A copy of the information contained in the device config. */ | |
213 | struct lguest_vqconfig config; | |
214 | ||
215 | /* The address where we mapped the virtio ring, so we can unmap it. */ | |
216 | void *pages; | |
217 | }; | |
218 | ||
2e04ef76 RR |
219 | /* |
220 | * When the virtio_ring code wants to prod the Host, it calls us here and we | |
a6bd8e13 | 221 | * make a hypercall. We hand the physical address of the virtqueue so the Host |
2e04ef76 RR |
222 | * knows which virtqueue we're talking about. |
223 | */ | |
19f1537b RR |
224 | static void lg_notify(struct virtqueue *vq) |
225 | { | |
2e04ef76 RR |
226 | /* |
227 | * We store our virtqueue information in the "priv" pointer of the | |
228 | * virtqueue structure. | |
229 | */ | |
19f1537b RR |
230 | struct lguest_vq_info *lvq = vq->priv; |
231 | ||
4cd8b5e2 | 232 | kvm_hypercall1(LHCALL_NOTIFY, lvq->config.pfn << PAGE_SHIFT); |
19f1537b RR |
233 | } |
234 | ||
6db6a5f3 RR |
235 | /* An extern declaration inside a C file is bad form. Don't do it. */ |
236 | extern void lguest_setup_irq(unsigned int irq); | |
237 | ||
2e04ef76 RR |
238 | /* |
239 | * This routine finds the first virtqueue described in the configuration of | |
19f1537b RR |
240 | * this device and sets it up. |
241 | * | |
242 | * This is kind of an ugly duckling. It'd be nicer to have a standard | |
243 | * representation of a virtqueue in the configuration space, but it seems that | |
e1e72965 | 244 | * everyone wants to do it differently. The KVM coders want the Guest to |
19f1537b RR |
245 | * allocate its own pages and tell the Host where they are, but for lguest it's |
246 | * simpler for the Host to simply tell us where the pages are. | |
247 | * | |
a6bd8e13 | 248 | * So we provide drivers with a "find the Nth virtqueue and set it up" |
2e04ef76 RR |
249 | * function. |
250 | */ | |
19f1537b | 251 | static struct virtqueue *lg_find_vq(struct virtio_device *vdev, |
a586d4f6 | 252 | unsigned index, |
9499f5e7 RR |
253 | void (*callback)(struct virtqueue *vq), |
254 | const char *name) | |
19f1537b | 255 | { |
a586d4f6 | 256 | struct lguest_device *ldev = to_lgdev(vdev); |
19f1537b RR |
257 | struct lguest_vq_info *lvq; |
258 | struct virtqueue *vq; | |
19f1537b RR |
259 | int err; |
260 | ||
a586d4f6 RR |
261 | /* We must have this many virtqueues. */ |
262 | if (index >= ldev->desc->num_vq) | |
19f1537b RR |
263 | return ERR_PTR(-ENOENT); |
264 | ||
265 | lvq = kmalloc(sizeof(*lvq), GFP_KERNEL); | |
266 | if (!lvq) | |
267 | return ERR_PTR(-ENOMEM); | |
268 | ||
2e04ef76 RR |
269 | /* |
270 | * Make a copy of the "struct lguest_vqconfig" entry, which sits after | |
a586d4f6 | 271 | * the descriptor. We need a copy because the config space might not |
2e04ef76 RR |
272 | * be aligned correctly. |
273 | */ | |
a586d4f6 | 274 | memcpy(&lvq->config, lg_vq(ldev->desc)+index, sizeof(lvq->config)); |
19f1537b | 275 | |
a586d4f6 RR |
276 | printk("Mapping virtqueue %i addr %lx\n", index, |
277 | (unsigned long)lvq->config.pfn << PAGE_SHIFT); | |
19f1537b RR |
278 | /* Figure out how many pages the ring will take, and map that memory */ |
279 | lvq->pages = lguest_map((unsigned long)lvq->config.pfn << PAGE_SHIFT, | |
42b36cc0 | 280 | DIV_ROUND_UP(vring_size(lvq->config.num, |
2966af73 | 281 | LGUEST_VRING_ALIGN), |
19f1537b RR |
282 | PAGE_SIZE)); |
283 | if (!lvq->pages) { | |
284 | err = -ENOMEM; | |
285 | goto free_lvq; | |
286 | } | |
287 | ||
2e04ef76 RR |
288 | /* |
289 | * OK, tell virtio_ring.c to set up a virtqueue now we know its size | |
290 | * and we've got a pointer to its pages. | |
291 | */ | |
87c7d57c | 292 | vq = vring_new_virtqueue(lvq->config.num, LGUEST_VRING_ALIGN, |
9499f5e7 | 293 | vdev, lvq->pages, lg_notify, callback, name); |
19f1537b RR |
294 | if (!vq) { |
295 | err = -ENOMEM; | |
296 | goto unmap; | |
297 | } | |
298 | ||
6db6a5f3 RR |
299 | /* Make sure the interrupt is allocated. */ |
300 | lguest_setup_irq(lvq->config.irq); | |
301 | ||
2e04ef76 RR |
302 | /* |
303 | * Tell the interrupt for this virtqueue to go to the virtio_ring | |
304 | * interrupt handler. | |
305 | * | |
306 | * FIXME: We used to have a flag for the Host to tell us we could use | |
19f1537b | 307 | * the interrupt as a source of randomness: it'd be nice to have that |
2e04ef76 RR |
308 | * back. |
309 | */ | |
19f1537b | 310 | err = request_irq(lvq->config.irq, vring_interrupt, IRQF_SHARED, |
bda53cd5 | 311 | dev_name(&vdev->dev), vq); |
19f1537b RR |
312 | if (err) |
313 | goto destroy_vring; | |
314 | ||
2e04ef76 RR |
315 | /* |
316 | * Last of all we hook up our 'struct lguest_vq_info" to the | |
317 | * virtqueue's priv pointer. | |
318 | */ | |
19f1537b RR |
319 | vq->priv = lvq; |
320 | return vq; | |
321 | ||
322 | destroy_vring: | |
323 | vring_del_virtqueue(vq); | |
324 | unmap: | |
325 | lguest_unmap(lvq->pages); | |
326 | free_lvq: | |
327 | kfree(lvq); | |
328 | return ERR_PTR(err); | |
329 | } | |
330 | /*:*/ | |
331 | ||
332 | /* Cleaning up a virtqueue is easy */ | |
333 | static void lg_del_vq(struct virtqueue *vq) | |
334 | { | |
335 | struct lguest_vq_info *lvq = vq->priv; | |
336 | ||
74b2553f RR |
337 | /* Release the interrupt */ |
338 | free_irq(lvq->config.irq, vq); | |
19f1537b RR |
339 | /* Tell virtio_ring.c to free the virtqueue. */ |
340 | vring_del_virtqueue(vq); | |
341 | /* Unmap the pages containing the ring. */ | |
342 | lguest_unmap(lvq->pages); | |
343 | /* Free our own queue information. */ | |
344 | kfree(lvq); | |
345 | } | |
346 | ||
d2a7ddda MT |
347 | static void lg_del_vqs(struct virtio_device *vdev) |
348 | { | |
349 | struct virtqueue *vq, *n; | |
350 | ||
351 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) | |
352 | lg_del_vq(vq); | |
353 | } | |
354 | ||
355 | static int lg_find_vqs(struct virtio_device *vdev, unsigned nvqs, | |
356 | struct virtqueue *vqs[], | |
357 | vq_callback_t *callbacks[], | |
358 | const char *names[]) | |
359 | { | |
360 | struct lguest_device *ldev = to_lgdev(vdev); | |
361 | int i; | |
362 | ||
363 | /* We must have this many virtqueues. */ | |
364 | if (nvqs > ldev->desc->num_vq) | |
365 | return -ENOENT; | |
366 | ||
367 | for (i = 0; i < nvqs; ++i) { | |
368 | vqs[i] = lg_find_vq(vdev, i, callbacks[i], names[i]); | |
369 | if (IS_ERR(vqs[i])) | |
370 | goto error; | |
371 | } | |
372 | return 0; | |
373 | ||
374 | error: | |
375 | lg_del_vqs(vdev); | |
376 | return PTR_ERR(vqs[i]); | |
377 | } | |
378 | ||
19f1537b RR |
379 | /* The ops structure which hooks everything together. */ |
380 | static struct virtio_config_ops lguest_config_ops = { | |
c45a6816 | 381 | .get_features = lg_get_features, |
c624896e | 382 | .finalize_features = lg_finalize_features, |
19f1537b RR |
383 | .get = lg_get, |
384 | .set = lg_set, | |
385 | .get_status = lg_get_status, | |
386 | .set_status = lg_set_status, | |
6e5aa7ef | 387 | .reset = lg_reset, |
d2a7ddda MT |
388 | .find_vqs = lg_find_vqs, |
389 | .del_vqs = lg_del_vqs, | |
19f1537b RR |
390 | }; |
391 | ||
2e04ef76 RR |
392 | /* |
393 | * The root device for the lguest virtio devices. This makes them appear as | |
394 | * /sys/devices/lguest/0,1,2 not /sys/devices/0,1,2. | |
395 | */ | |
ff8561c4 | 396 | static struct device *lguest_root; |
19f1537b | 397 | |
2e04ef76 RR |
398 | /*D:120 |
399 | * This is the core of the lguest bus: actually adding a new device. | |
19f1537b RR |
400 | * It's a separate function because it's neater that way, and because an |
401 | * earlier version of the code supported hotplug and unplug. They were removed | |
402 | * early on because they were never used. | |
403 | * | |
404 | * As Andrew Tridgell says, "Untested code is buggy code". | |
405 | * | |
406 | * It's worth reading this carefully: we start with a pointer to the new device | |
b769f579 | 407 | * descriptor in the "lguest_devices" page, and the offset into the device |
2e04ef76 RR |
408 | * descriptor page so we can uniquely identify it if things go badly wrong. |
409 | */ | |
b769f579 RR |
410 | static void add_lguest_device(struct lguest_device_desc *d, |
411 | unsigned int offset) | |
19f1537b RR |
412 | { |
413 | struct lguest_device *ldev; | |
414 | ||
2e04ef76 | 415 | /* Start with zeroed memory; Linux's device layer counts on it. */ |
19f1537b RR |
416 | ldev = kzalloc(sizeof(*ldev), GFP_KERNEL); |
417 | if (!ldev) { | |
b769f579 RR |
418 | printk(KERN_EMERG "Cannot allocate lguest dev %u type %u\n", |
419 | offset, d->type); | |
19f1537b RR |
420 | return; |
421 | } | |
422 | ||
423 | /* This devices' parent is the lguest/ dir. */ | |
ff8561c4 | 424 | ldev->vdev.dev.parent = lguest_root; |
19f1537b | 425 | /* We have a unique device index thanks to the dev_index counter. */ |
19f1537b | 426 | ldev->vdev.id.device = d->type; |
2e04ef76 RR |
427 | /* |
428 | * We have a simple set of routines for querying the device's | |
429 | * configuration information and setting its status. | |
430 | */ | |
19f1537b RR |
431 | ldev->vdev.config = &lguest_config_ops; |
432 | /* And we remember the device's descriptor for lguest_config_ops. */ | |
433 | ldev->desc = d; | |
434 | ||
2e04ef76 RR |
435 | /* |
436 | * register_virtio_device() sets up the generic fields for the struct | |
19f1537b | 437 | * virtio_device and calls device_register(). This makes the bus |
2e04ef76 RR |
438 | * infrastructure look for a matching driver. |
439 | */ | |
19f1537b | 440 | if (register_virtio_device(&ldev->vdev) != 0) { |
b769f579 RR |
441 | printk(KERN_ERR "Failed to register lguest dev %u type %u\n", |
442 | offset, d->type); | |
19f1537b RR |
443 | kfree(ldev); |
444 | } | |
445 | } | |
446 | ||
2e04ef76 RR |
447 | /*D:110 |
448 | * scan_devices() simply iterates through the device page. The type 0 is | |
449 | * reserved to mean "end of devices". | |
450 | */ | |
19f1537b RR |
451 | static void scan_devices(void) |
452 | { | |
453 | unsigned int i; | |
454 | struct lguest_device_desc *d; | |
455 | ||
456 | /* We start at the page beginning, and skip over each entry. */ | |
a586d4f6 | 457 | for (i = 0; i < PAGE_SIZE; i += desc_size(d)) { |
19f1537b RR |
458 | d = lguest_devices + i; |
459 | ||
460 | /* Once we hit a zero, stop. */ | |
461 | if (d->type == 0) | |
462 | break; | |
463 | ||
a586d4f6 | 464 | printk("Device at %i has size %u\n", i, desc_size(d)); |
b769f579 | 465 | add_lguest_device(d, i); |
19f1537b RR |
466 | } |
467 | } | |
468 | ||
2e04ef76 RR |
469 | /*D:105 |
470 | * Fairly early in boot, lguest_devices_init() is called to set up the | |
19f1537b RR |
471 | * lguest device infrastructure. We check that we are a Guest by checking |
472 | * pv_info.name: there are other ways of checking, but this seems most | |
473 | * obvious to me. | |
474 | * | |
475 | * So we can access the "struct lguest_device_desc"s easily, we map that memory | |
476 | * and store the pointer in the global "lguest_devices". Then we register a | |
477 | * root device from which all our devices will hang (this seems to be the | |
478 | * correct sysfs incantation). | |
479 | * | |
480 | * Finally we call scan_devices() which adds all the devices found in the | |
2e04ef76 RR |
481 | * lguest_devices page. |
482 | */ | |
19f1537b RR |
483 | static int __init lguest_devices_init(void) |
484 | { | |
485 | if (strcmp(pv_info.name, "lguest") != 0) | |
486 | return 0; | |
487 | ||
ff8561c4 MM |
488 | lguest_root = root_device_register("lguest"); |
489 | if (IS_ERR(lguest_root)) | |
19f1537b RR |
490 | panic("Could not register lguest root"); |
491 | ||
492 | /* Devices are in a single page above top of "normal" mem */ | |
493 | lguest_devices = lguest_map(max_pfn<<PAGE_SHIFT, 1); | |
494 | ||
495 | scan_devices(); | |
496 | return 0; | |
497 | } | |
498 | /* We do this after core stuff, but before the drivers. */ | |
499 | postcore_initcall(lguest_devices_init); | |
500 | ||
2e04ef76 RR |
501 | /*D:150 |
502 | * At this point in the journey we used to now wade through the lguest | |
19f1537b RR |
503 | * devices themselves: net, block and console. Since they're all now virtio |
504 | * devices rather than lguest-specific, I've decided to ignore them. Mostly, | |
505 | * they're kind of boring. But this does mean you'll never experience the | |
506 | * thrill of reading the forbidden love scene buried deep in the block driver. | |
507 | * | |
508 | * "make Launcher" beckons, where we answer questions like "Where do Guests | |
2e04ef76 RR |
509 | * come from?", and "What do you do when someone asks for optimization?". |
510 | */ |