blob: a5ebc0083d87ad02e03f23ed8be7e66267c5d97e [file] [log] [blame]
Rusty Russell2e04ef72009-07-30 16:03:45 -06001/*P:400
2 * This contains run_guest() which actually calls into the Host<->Guest
Rusty Russellf938d2c2007-07-26 10:41:02 -07003 * Switcher and analyzes the return, such as determining if the Guest wants the
Rusty Russell2e04ef72009-07-30 16:03:45 -06004 * Host to do something. This file also contains useful helper routines.
5:*/
Rusty Russelld7e28ff2007-07-19 01:49:23 -07006#include <linux/module.h>
7#include <linux/stringify.h>
8#include <linux/stddef.h>
9#include <linux/io.h>
10#include <linux/mm.h>
11#include <linux/vmalloc.h>
12#include <linux/cpu.h>
13#include <linux/freezer.h>
Jes Sorensen625efab2007-10-22 11:03:28 +100014#include <linux/highmem.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090015#include <linux/slab.h>
Rusty Russelld7e28ff2007-07-19 01:49:23 -070016#include <asm/paravirt.h>
Rusty Russelld7e28ff2007-07-19 01:49:23 -070017#include <asm/pgtable.h>
18#include <asm/uaccess.h>
19#include <asm/poll.h>
Rusty Russelld7e28ff2007-07-19 01:49:23 -070020#include <asm/asm-offsets.h>
Rusty Russelld7e28ff2007-07-19 01:49:23 -070021#include "lg.h"
22
Rusty Russelld7e28ff2007-07-19 01:49:23 -070023
24static struct vm_struct *switcher_vma;
25static struct page **switcher_page;
26
Rusty Russelld7e28ff2007-07-19 01:49:23 -070027/* This One Big lock protects all inter-guest data structures. */
28DEFINE_MUTEX(lguest_lock);
Rusty Russelld7e28ff2007-07-19 01:49:23 -070029
Rusty Russell2e04ef72009-07-30 16:03:45 -060030/*H:010
31 * We need to set up the Switcher at a high virtual address. Remember the
Rusty Russellbff672e2007-07-26 10:41:04 -070032 * Switcher is a few hundred bytes of assembler code which actually changes the
33 * CPU to run the Guest, and then changes back to the Host when a trap or
34 * interrupt happens.
35 *
36 * The Switcher code must be at the same virtual address in the Guest as the
37 * Host since it will be running as the switchover occurs.
38 *
39 * Trying to map memory at a particular address is an unusual thing to do, so
Rusty Russell2e04ef72009-07-30 16:03:45 -060040 * it's not a simple one-liner.
41 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -070042static __init int map_switcher(void)
43{
44 int i, err;
45 struct page **pagep;
46
Rusty Russellbff672e2007-07-26 10:41:04 -070047 /*
48 * Map the Switcher in to high memory.
49 *
50 * It turns out that if we choose the address 0xFFC00000 (4MB under the
51 * top virtual address), it makes setting up the page tables really
52 * easy.
53 */
54
Rusty Russell2e04ef72009-07-30 16:03:45 -060055 /*
56 * We allocate an array of struct page pointers. map_vm_area() wants
57 * this, rather than just an array of pages.
58 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -070059 switcher_page = kmalloc(sizeof(switcher_page[0])*TOTAL_SWITCHER_PAGES,
60 GFP_KERNEL);
61 if (!switcher_page) {
62 err = -ENOMEM;
63 goto out;
64 }
65
Rusty Russell2e04ef72009-07-30 16:03:45 -060066 /*
67 * Now we actually allocate the pages. The Guest will see these pages,
68 * so we make sure they're zeroed.
69 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -070070 for (i = 0; i < TOTAL_SWITCHER_PAGES; i++) {
Xiao Guangrong6c189d82009-08-05 17:42:37 +080071 switcher_page[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
72 if (!switcher_page[i]) {
Rusty Russelld7e28ff2007-07-19 01:49:23 -070073 err = -ENOMEM;
74 goto free_some_pages;
75 }
Rusty Russelld7e28ff2007-07-19 01:49:23 -070076 }
77
Rusty Russell2e04ef72009-07-30 16:03:45 -060078 /*
79 * First we check that the Switcher won't overlap the fixmap area at
Rusty Russellf14ae652008-03-11 09:35:56 -050080 * the top of memory. It's currently nowhere near, but it could have
Rusty Russell2e04ef72009-07-30 16:03:45 -060081 * very strange effects if it ever happened.
82 */
Rusty Russellf14ae652008-03-11 09:35:56 -050083 if (SWITCHER_ADDR + (TOTAL_SWITCHER_PAGES+1)*PAGE_SIZE > FIXADDR_START){
84 err = -ENOMEM;
85 printk("lguest: mapping switcher would thwack fixmap\n");
86 goto free_pages;
87 }
88
Rusty Russell2e04ef72009-07-30 16:03:45 -060089 /*
90 * Now we reserve the "virtual memory area" we want: 0xFFC00000
Rusty Russellbff672e2007-07-26 10:41:04 -070091 * (SWITCHER_ADDR). We might not get it in theory, but in practice
Rusty Russellf14ae652008-03-11 09:35:56 -050092 * it's worked so far. The end address needs +1 because __get_vm_area
Rusty Russell2e04ef72009-07-30 16:03:45 -060093 * allocates an extra guard page, so we need space for that.
94 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -070095 switcher_vma = __get_vm_area(TOTAL_SWITCHER_PAGES * PAGE_SIZE,
Rusty Russellf14ae652008-03-11 09:35:56 -050096 VM_ALLOC, SWITCHER_ADDR, SWITCHER_ADDR
97 + (TOTAL_SWITCHER_PAGES+1) * PAGE_SIZE);
Rusty Russelld7e28ff2007-07-19 01:49:23 -070098 if (!switcher_vma) {
99 err = -ENOMEM;
100 printk("lguest: could not map switcher pages high\n");
101 goto free_pages;
102 }
103
Rusty Russell2e04ef72009-07-30 16:03:45 -0600104 /*
105 * This code actually sets up the pages we've allocated to appear at
Rusty Russellbff672e2007-07-26 10:41:04 -0700106 * SWITCHER_ADDR. map_vm_area() takes the vma we allocated above, the
107 * kind of pages we're mapping (kernel pages), and a pointer to our
108 * array of struct pages. It increments that pointer, but we don't
Rusty Russell2e04ef72009-07-30 16:03:45 -0600109 * care.
110 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700111 pagep = switcher_page;
Matias Zabaljaureguied1dc772009-05-30 15:35:49 -0300112 err = map_vm_area(switcher_vma, PAGE_KERNEL_EXEC, &pagep);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700113 if (err) {
114 printk("lguest: map_vm_area failed: %i\n", err);
115 goto free_vma;
116 }
Rusty Russellbff672e2007-07-26 10:41:04 -0700117
Rusty Russell2e04ef72009-07-30 16:03:45 -0600118 /*
119 * Now the Switcher is mapped at the right address, we can't fail!
Rusty Russell9f542882011-07-22 14:39:50 +0930120 * Copy in the compiled-in Switcher code (from x86/switcher_32.S).
Rusty Russell2e04ef72009-07-30 16:03:45 -0600121 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700122 memcpy(switcher_vma->addr, start_switcher_text,
123 end_switcher_text - start_switcher_text);
124
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700125 printk(KERN_INFO "lguest: mapped switcher at %p\n",
126 switcher_vma->addr);
Rusty Russellbff672e2007-07-26 10:41:04 -0700127 /* And we succeeded... */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700128 return 0;
129
130free_vma:
131 vunmap(switcher_vma->addr);
132free_pages:
133 i = TOTAL_SWITCHER_PAGES;
134free_some_pages:
135 for (--i; i >= 0; i--)
136 __free_pages(switcher_page[i], 0);
137 kfree(switcher_page);
138out:
139 return err;
140}
Rusty Russellbff672e2007-07-26 10:41:04 -0700141/*:*/
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700142
Rusty Russell2e04ef72009-07-30 16:03:45 -0600143/* Cleaning up the mapping when the module is unloaded is almost... too easy. */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700144static void unmap_switcher(void)
145{
146 unsigned int i;
147
Rusty Russellbff672e2007-07-26 10:41:04 -0700148 /* vunmap() undoes *both* map_vm_area() and __get_vm_area(). */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700149 vunmap(switcher_vma->addr);
Rusty Russellbff672e2007-07-26 10:41:04 -0700150 /* Now we just need to free the pages we copied the switcher into */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700151 for (i = 0; i < TOTAL_SWITCHER_PAGES; i++)
152 __free_pages(switcher_page[i], 0);
Johannes Weiner0a707212008-07-08 10:29:42 +0200153 kfree(switcher_page);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700154}
155
Rusty Russelle1e72962007-10-25 15:02:50 +1000156/*H:032
Rusty Russelldde79782007-07-26 10:41:03 -0700157 * Dealing With Guest Memory.
158 *
Rusty Russelle1e72962007-10-25 15:02:50 +1000159 * Before we go too much further into the Host, we need to grok the routines
160 * we use to deal with Guest memory.
161 *
Rusty Russelldde79782007-07-26 10:41:03 -0700162 * When the Guest gives us (what it thinks is) a physical address, we can use
Rusty Russell3c6b5bf2007-10-22 11:03:26 +1000163 * the normal copy_from_user() & copy_to_user() on the corresponding place in
164 * the memory region allocated by the Launcher.
Rusty Russelldde79782007-07-26 10:41:03 -0700165 *
166 * But we can't trust the Guest: it might be trying to access the Launcher
167 * code. We have to check that the range is below the pfn_limit the Launcher
168 * gave us. We have to make sure that addr + len doesn't give us a false
Rusty Russell2e04ef72009-07-30 16:03:45 -0600169 * positive by overflowing, too.
170 */
Matias Zabaljaureguidf1693a2009-03-18 13:38:35 -0300171bool lguest_address_ok(const struct lguest *lg,
172 unsigned long addr, unsigned long len)
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700173{
174 return (addr+len) / PAGE_SIZE < lg->pfn_limit && (addr+len >= addr);
175}
176
Rusty Russell2e04ef72009-07-30 16:03:45 -0600177/*
178 * This routine copies memory from the Guest. Here we can see how useful the
Rusty Russell2d37f942007-10-22 11:24:24 +1000179 * kill_lguest() routine we met in the Launcher can be: we return a random
Rusty Russell2e04ef72009-07-30 16:03:45 -0600180 * value (all zeroes) instead of needing to return an error.
181 */
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200182void __lgread(struct lg_cpu *cpu, void *b, unsigned long addr, unsigned bytes)
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700183{
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200184 if (!lguest_address_ok(cpu->lg, addr, bytes)
185 || copy_from_user(b, cpu->lg->mem_base + addr, bytes) != 0) {
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700186 /* copy_from_user should do this, but as we rely on it... */
187 memset(b, 0, bytes);
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200188 kill_guest(cpu, "bad read address %#lx len %u", addr, bytes);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700189 }
190}
191
Rusty Russella6bd8e12008-03-28 11:05:53 -0500192/* This is the write (copy into Guest) version. */
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200193void __lgwrite(struct lg_cpu *cpu, unsigned long addr, const void *b,
Rusty Russell2d37f942007-10-22 11:24:24 +1000194 unsigned bytes)
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700195{
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200196 if (!lguest_address_ok(cpu->lg, addr, bytes)
197 || copy_to_user(cpu->lg->mem_base + addr, b, bytes) != 0)
198 kill_guest(cpu, "bad write address %#lx len %u", addr, bytes);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700199}
Rusty Russell2d37f942007-10-22 11:24:24 +1000200/*:*/
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700201
Rusty Russell2e04ef72009-07-30 16:03:45 -0600202/*H:030
203 * Let's jump straight to the the main loop which runs the Guest.
Rusty Russellbff672e2007-07-26 10:41:04 -0700204 * Remember, this is called by the Launcher reading /dev/lguest, and we keep
Rusty Russell2e04ef72009-07-30 16:03:45 -0600205 * going around and around until something interesting happens.
206 */
Glauber de Oliveira Costad0953d42008-01-07 11:05:25 -0200207int run_guest(struct lg_cpu *cpu, unsigned long __user *user)
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700208{
Rusty Russellbff672e2007-07-26 10:41:04 -0700209 /* We stop running once the Guest is dead. */
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200210 while (!cpu->lg->dead) {
Rusty Russellabd41f02009-06-12 22:27:02 -0600211 unsigned int irq;
Rusty Russella32a88132009-06-12 22:27:02 -0600212 bool more;
Rusty Russellabd41f02009-06-12 22:27:02 -0600213
Rusty Russellcc6d4fb2007-10-22 11:03:30 +1000214 /* First we run any hypercalls the Guest wants done. */
Glauber de Oliveira Costa73044f02008-01-07 11:05:27 -0200215 if (cpu->hcall)
216 do_hypercalls(cpu);
Rusty Russellcc6d4fb2007-10-22 11:03:30 +1000217
Rusty Russell2e04ef72009-07-30 16:03:45 -0600218 /*
219 * It's possible the Guest did a NOTIFY hypercall to the
Rusty Russella91d74a2009-07-30 16:03:45 -0600220 * Launcher.
Rusty Russell2e04ef72009-07-30 16:03:45 -0600221 */
Glauber de Oliveira Costa5e232f42008-01-07 11:05:36 -0200222 if (cpu->pending_notify) {
Rusty Russella91d74a2009-07-30 16:03:45 -0600223 /*
224 * Does it just needs to write to a registered
225 * eventfd (ie. the appropriate virtqueue thread)?
226 */
Rusty Russelldf60aee2009-06-12 22:27:09 -0600227 if (!send_notify_to_eventfd(cpu)) {
Alex Russell681f2062012-10-16 23:56:13 +1030228 /* OK, we tell the main Launcher. */
Rusty Russelldf60aee2009-06-12 22:27:09 -0600229 if (put_user(cpu->pending_notify, user))
230 return -EFAULT;
231 return sizeof(cpu->pending_notify);
232 }
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700233 }
234
Michal Hocko0acf0002011-09-27 08:56:03 +0200235 /*
236 * All long-lived kernel loops need to check with this horrible
237 * thing called the freezer. If the Host is trying to suspend,
238 * it stops us.
239 */
240 try_to_freeze();
241
Rusty Russellbff672e2007-07-26 10:41:04 -0700242 /* Check for signals */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700243 if (signal_pending(current))
244 return -ERESTARTSYS;
245
Rusty Russell2e04ef72009-07-30 16:03:45 -0600246 /*
247 * Check if there are any interrupts which can be delivered now:
Rusty Russella6bd8e12008-03-28 11:05:53 -0500248 * if so, this sets up the hander to be executed when we next
Rusty Russell2e04ef72009-07-30 16:03:45 -0600249 * run the Guest.
250 */
Rusty Russella32a88132009-06-12 22:27:02 -0600251 irq = interrupt_pending(cpu, &more);
Rusty Russellabd41f02009-06-12 22:27:02 -0600252 if (irq < LGUEST_IRQS)
Rusty Russella32a88132009-06-12 22:27:02 -0600253 try_deliver_interrupt(cpu, irq, more);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700254
Rusty Russell2e04ef72009-07-30 16:03:45 -0600255 /*
Rusty Russell2e04ef72009-07-30 16:03:45 -0600256 * Just make absolutely sure the Guest is still alive. One of
257 * those hypercalls could have been fatal, for example.
258 */
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200259 if (cpu->lg->dead)
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700260 break;
261
Rusty Russell2e04ef72009-07-30 16:03:45 -0600262 /*
263 * If the Guest asked to be stopped, we sleep. The Guest's
264 * clock timer will wake us.
265 */
Glauber de Oliveira Costa66686c22008-01-07 11:05:34 -0200266 if (cpu->halted) {
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700267 set_current_state(TASK_INTERRUPTIBLE);
Rusty Russell2e04ef72009-07-30 16:03:45 -0600268 /*
269 * Just before we sleep, make sure no interrupt snuck in
270 * which we should be doing.
271 */
Rusty Russell5dac0512009-06-12 22:27:10 -0600272 if (interrupt_pending(cpu, &more) < LGUEST_IRQS)
Rusty Russellabd41f02009-06-12 22:27:02 -0600273 set_current_state(TASK_RUNNING);
274 else
275 schedule();
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700276 continue;
277 }
278
Rusty Russell2e04ef72009-07-30 16:03:45 -0600279 /*
280 * OK, now we're ready to jump into the Guest. First we put up
281 * the "Do Not Disturb" sign:
282 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700283 local_irq_disable();
284
Jes Sorensen625efab2007-10-22 11:03:28 +1000285 /* Actually run the Guest until something happens. */
Glauber de Oliveira Costad0953d42008-01-07 11:05:25 -0200286 lguest_arch_run_guest(cpu);
Rusty Russellbff672e2007-07-26 10:41:04 -0700287
288 /* Now we're ready to be interrupted or moved to other CPUs */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700289 local_irq_enable();
290
Jes Sorensen625efab2007-10-22 11:03:28 +1000291 /* Now we deal with whatever happened to the Guest. */
Glauber de Oliveira Costa73044f02008-01-07 11:05:27 -0200292 lguest_arch_handle_trap(cpu);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700293 }
Jes Sorensen625efab2007-10-22 11:03:28 +1000294
Rusty Russella6bd8e12008-03-28 11:05:53 -0500295 /* Special case: Guest is 'dead' but wants a reboot. */
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200296 if (cpu->lg->dead == ERR_PTR(-ERESTART))
Balaji Raoec04b132007-12-28 14:26:24 +0530297 return -ERESTART;
Rusty Russella6bd8e12008-03-28 11:05:53 -0500298
Rusty Russellbff672e2007-07-26 10:41:04 -0700299 /* The Guest is dead => "No such file or directory" */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700300 return -ENOENT;
301}
302
Rusty Russellbff672e2007-07-26 10:41:04 -0700303/*H:000
304 * Welcome to the Host!
305 *
306 * By this point your brain has been tickled by the Guest code and numbed by
307 * the Launcher code; prepare for it to be stretched by the Host code. This is
308 * the heart. Let's begin at the initialization routine for the Host's lg
309 * module.
310 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700311static int __init init(void)
312{
313 int err;
314
Rusty Russellbff672e2007-07-26 10:41:04 -0700315 /* Lguest can't run under Xen, VMI or itself. It does Tricky Stuff. */
Rusty Russellb56e3212011-10-27 10:56:17 +1030316 if (get_kernel_rpl() != 0) {
Glauber de Oliveira Costa5c558412008-01-17 22:32:50 -0200317 printk("lguest is afraid of being a guest\n");
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700318 return -EPERM;
319 }
320
Rusty Russellbff672e2007-07-26 10:41:04 -0700321 /* First we put the Switcher up in very high virtual memory. */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700322 err = map_switcher();
323 if (err)
Rusty Russellc18acd72007-10-22 11:03:35 +1000324 goto out;
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700325
Rusty Russellbff672e2007-07-26 10:41:04 -0700326 /* Now we set up the pagetable implementation for the Guests. */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700327 err = init_pagetables(switcher_page, SHARED_SWITCHER_PAGES);
Rusty Russellc18acd72007-10-22 11:03:35 +1000328 if (err)
329 goto unmap;
Rusty Russellbff672e2007-07-26 10:41:04 -0700330
Rusty Russellc18acd72007-10-22 11:03:35 +1000331 /* We might need to reserve an interrupt vector. */
332 err = init_interrupts();
333 if (err)
334 goto free_pgtables;
335
Rusty Russellbff672e2007-07-26 10:41:04 -0700336 /* /dev/lguest needs to be registered. */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700337 err = lguest_device_init();
Rusty Russellc18acd72007-10-22 11:03:35 +1000338 if (err)
339 goto free_interrupts;
Rusty Russellbff672e2007-07-26 10:41:04 -0700340
Jes Sorensen625efab2007-10-22 11:03:28 +1000341 /* Finally we do some architecture-specific setup. */
342 lguest_arch_host_init();
Rusty Russellbff672e2007-07-26 10:41:04 -0700343
344 /* All good! */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700345 return 0;
Rusty Russellc18acd72007-10-22 11:03:35 +1000346
347free_interrupts:
348 free_interrupts();
349free_pgtables:
350 free_pagetables();
351unmap:
352 unmap_switcher();
353out:
354 return err;
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700355}
356
Rusty Russellbff672e2007-07-26 10:41:04 -0700357/* Cleaning up is just the same code, backwards. With a little French. */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700358static void __exit fini(void)
359{
360 lguest_device_remove();
Rusty Russellc18acd72007-10-22 11:03:35 +1000361 free_interrupts();
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700362 free_pagetables();
363 unmap_switcher();
Rusty Russellbff672e2007-07-26 10:41:04 -0700364
Jes Sorensen625efab2007-10-22 11:03:28 +1000365 lguest_arch_host_fini();
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700366}
Jes Sorensen625efab2007-10-22 11:03:28 +1000367/*:*/
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700368
Rusty Russell2e04ef72009-07-30 16:03:45 -0600369/*
370 * The Host side of lguest can be a module. This is a nice way for people to
371 * play with it.
372 */
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700373module_init(init);
374module_exit(fini);
375MODULE_LICENSE("GPL");
376MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");