Palacios Public Git Repository

To checkout Palacios execute

  git clone http://v3vee.org/palacios/palacios.web/palacios.git
This will give you the master branch. You probably want the devel branch or one of the release branches. To switch to the devel branch, simply execute
  cd palacios
  git checkout --track -b devel origin/devel
The other branches are similar.


Minor changes to debugging, change to Makefile to support building TAGS files, added...
[palacios.git] / palacios / src / devices / icc_bus.c
1 /*
2  * This file is part of the Palacios Virtual Machine Monitor developed
3  * by the V3VEE Project with funding from the United States National
4  * Science Foundation and the Department of Energy.
5  *
6  * The V3VEE Project is a joint project between Northwestern University
7  * and the University of New Mexico.  You can find out more at
8  * http://www.v3vee.org
9  *
10  * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
11  * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
12  * All rights reserved.
13  *
14  * Author: Jack Lange <jarusl@cs.northwestern.edu>
15  *
16  * This is free software.  You are permitted to use,
17  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
18  */
19
20 #include <palacios/vmm_dev_mgr.h>
21 #include <palacios/vmm_sprintf.h>
22 #include <palacios/vm_guest.h>
23 #include <devices/icc_bus.h>
24 #include <devices/apic_regs.h>
25
26 #define MAX_APICS 256
27
28 #ifndef CONFIG_DEBUG_ICC_BUS
29 #undef PrintDebug
30 #define PrintDebug(fmt, args...)
31 #endif
32
33
34 void v3_force_exit(void *p) {
35 #ifdef CONFIG_DEBUG_ICC_BUS
36     struct guest_info *core=(struct guest_info *)p;
37 #endif
38     PrintDebug("core %u: Forced to exit!\n",core->cpu_id);
39 }
40
41 struct ipi_thunk_data {
42     struct vm_device * target;
43     uint64_t val;
44 };
45
46
47
48 struct apic_data {
49     struct guest_info * core;
50     struct v3_icc_ops * ops;
51     
52     void * priv_data;
53     int present;
54 };
55
56
57 struct icc_bus_state {
58     struct apic_data apics[MAX_APICS];
59     
60     uint32_t         ioapic_id;
61 };
62
63 static struct v3_device_ops dev_ops = {
64     .free = NULL,
65     .reset = NULL,
66     .start = NULL,
67     .stop = NULL,
68 };
69
70 #ifdef CONFIG_DEBUG_ICC_BUS
71 static char *shorthand_str[] = { 
72     "(no shorthand)",
73     "(self)",
74     "(all)",
75     "(all-but-me)",
76  };
77
78 static char *deliverymode_str[] = { 
79     "(fixed)",
80     "(lowest priority)",
81     "(SMI)",
82     "(reserved)",
83     "(NMI)",
84     "(INIT)",
85     "(Start Up)",
86     "(ExtInt)",
87 };
88 #endif
89
90
91 static int deliver(uint32_t src_apic, struct apic_data *dest_apic, struct int_cmd_reg *icr, struct icc_bus_state * state, uint32_t extirq) {
92
93     switch (icr->del_mode) {                                            
94
95         case 0:  //fixed
96         case 1: // lowest priority
97         case 7: // ExtInt
98             PrintDebug("icc_bus: delivering IRQ to core %u\n",dest_apic->core->cpu_id); 
99             dest_apic->ops->raise_intr(dest_apic->core, 
100                                        icr->del_mode!=7 ? icr->vec : extirq,
101                                        dest_apic->priv_data); 
102             if (src_apic!=state->ioapic_id && dest_apic->core->cpu_id != src_apic) { 
103                 // Assume core # is same as logical processor for now
104                 // TODO FIX THIS FIX THIS
105                 // THERE SHOULD BE:  guestapicid->virtualapicid map,
106                 //                   cpu_id->logical processor map
107                 //     host maitains logical proc->phsysical proc
108                 PrintDebug("icc_bus: non-local core, forcing it to exit\n"); 
109                 V3_Call_On_CPU(dest_apic->core->cpu_id,v3_force_exit,(void*)(dest_apic->core));
110                 // TODO: do what the print says
111             }                                                   
112             break;                                                      
113             
114         case 2:   //SMI                 
115             PrintError("icc_bus: SMI delivery is unsupported\n");       
116             return -1;                                          
117             break;                                                      
118             
119         case 3:  //reserved                                             
120             PrintError("icc_bus: Reserved delivery mode 3 is unsupported\n"); 
121             return -1;                                          
122             break;                                                      
123
124         case 4:  //NMI                                  
125             PrintError("icc_bus: NMI delivery is unsupported\n"); 
126             return -1;                                          
127             break;                                                      
128
129         case 5: { //INIT
130             struct guest_info *core = dest_apic->core;
131
132             PrintDebug("icc_bus: INIT delivery to core %u\n",core->cpu_id);
133
134             // TODO: any APIC reset on dest core (shouldn't be needed, but not sure...)
135
136             // Sanity check
137             if (core->cpu_mode != INIT) { 
138                 PrintError("icc_bus: Warning: core %u is not in INIT state (mode = %d), ignored\n",core->cpu_id, core->cpu_mode);
139                 // Only a warning, since INIT INIT SIPI is common
140                 break;
141             }
142
143             // We transition the target core to SIPI state
144             core->cpu_mode = SIPI;  // note: locking should not be needed here
145
146             // That should be it since the target core should be
147             // waiting in host on this transition
148             // either it's on another core or on a different preemptive thread
149             // in both cases, it will quickly notice this transition 
150             // in particular, we should not need to force an exit here
151
152             PrintDebug("icc_bus: INIT delivery done\n");
153
154         }
155             break;                                                      
156
157         case 6: { //SIPI
158             struct guest_info *core = dest_apic->core;
159
160             // Sanity check
161             if (core->cpu_mode!=SIPI) { 
162                 PrintError("icc_bus: core %u is not in SIPI state (mode = %d), ignored!\n",core->cpu_id, core->cpu_mode);
163                 break;
164             }
165
166             // Write the RIP, CS, and descriptor
167             // assume the rest is already good to go
168             //
169             // vector VV -> rip at 0
170             //              CS = VV00
171             //  This means we start executing at linear address VV000
172             //
173             // So the selector needs to be VV00
174             // and the base needs to be VV000
175             //
176             core->rip = 0;
177             core->segments.cs.selector = icr->vec << 8;
178             core->segments.cs.limit = 0xffff;
179             core->segments.cs.base = icr->vec << 12;
180
181             PrintDebug("icc_bus: SIPI delivery (0x%x -> 0x%x:0x0) to core %u\n",
182                        icr->vec, core->segments.cs.selector, core->cpu_id);
183             // Maybe need to adjust the APIC?
184             
185             // We transition the target core to SIPI state
186             core->cpu_mode = REAL;  // note: locking should not be needed here
187
188             // As with INIT, we should not need to do anything else
189
190             PrintDebug("icc_bus: SIPI delivery done\n");
191
192         }
193             break;                                                      
194     }
195
196     return 0;
197
198
199
200 //
201 // icr_data contains interrupt vector *except* for ext_int
202 // in which case it is given via irq
203 //
204
205 int v3_icc_send_ipi(struct vm_device * icc_bus, uint32_t src_apic, uint64_t icr_data, uint32_t extirq) {
206
207     struct int_cmd_reg *icr = (struct int_cmd_reg *)&icr_data;
208
209     struct icc_bus_state * state = (struct icc_bus_state *)icc_bus->private_data;
210     struct apic_data * dest_apic = NULL;
211     PrintDebug("icc_bus: icc_bus=%p, src_apic=%u, icr_data=%llx, extirq=%u\n", 
212                icc_bus, src_apic, icr_data, extirq);
213
214     // initial sanity checks
215     if ((src_apic >= MAX_APICS) || 
216         ((state->apics[src_apic].present == 0) && 
217          (src_apic != state->ioapic_id))) { 
218         PrintError("icc_bus: Apparently sending from unregistered apic id=%u\n",src_apic);
219         return -1;
220     }
221
222
223     if ((icr->dst_mode == 0) && (state->apics[icr->dst].present == 0)) { 
224         PrintError("icc_bus: Attempted send to unregistered apic id=%u\n", icr->dst);
225         return -1;
226     }
227
228     dest_apic =  &(state->apics[icr->dst]);
229
230
231     PrintDebug("icc_bus: IPI %s %u from %s %u to %s %s %u (icr=0x%llx, extirq=%u)\n",
232                deliverymode_str[icr->del_mode], icr->vec, 
233                src_apic==state->ioapic_id ? "ioapic" : "apic",
234                src_apic,               
235                icr->dst_mode==0 ? "(physical)" : "(logical)", 
236                shorthand_str[icr->dst_shorthand], icr->dst,icr->val,
237                extirq);
238
239     /*
240
241     if (icr->dst==state->ioapic_id) { 
242         PrintError("icc_bus: Attempted send to ioapic ignored\n");
243         return -1;
244     }
245     */
246
247
248
249     switch (icr->dst_shorthand) {
250
251         case 0:  // no shorthand
252
253             if (icr->dst_mode==0) { 
254                 // physical delivery
255                 struct apic_data * dest_apic =  &(state->apics[icr->dst]);
256                 if (deliver(src_apic,dest_apic,icr,state,extirq)) { 
257                     return -1;
258                 }
259             } else {
260                 // logical delivery
261                 int i;
262                 uint8_t mda = icr->dst;
263                 for (i=0;i<MAX_APICS;i++) { 
264                     struct apic_data *dest_apic=&(state->apics[i]);
265                     if (dest_apic->present &&
266                         dest_apic->ops->should_deliver(dest_apic->core,
267                                                        mda,
268                                                        dest_apic->priv_data)) {
269                         if (deliver(src_apic,dest_apic,icr,state,extirq)) { 
270                             return -1;
271                         }
272                     }
273                 }
274             }
275             
276             break;
277             
278         case 1:  // self
279
280             if (icr->dst_mode==0) { 
281                 // physical delivery
282                 if (icr->dst==state->ioapic_id) { 
283                     PrintError("icc_bus: ioapic attempting to send to itself\n");
284                     return -1;
285                 }
286                 struct apic_data *dest_apic=&(state->apics[src_apic]);
287                 if (deliver(src_apic,dest_apic,icr,state,extirq)) { 
288                     return -1;
289                 }
290             } else {
291                 // logical delivery
292                 PrintError("icc_bus: use of logical delivery in self is not yet supported.\n");
293
294                 return -1;
295             }
296             break;
297             
298         case 2: 
299
300         case 3: { // all and all-but-me
301             // assuming that logical verus physical doesn't matter
302             // although it is odd that both are used
303             int i;
304             for (i=0;i<MAX_APICS;i++) { 
305                 struct apic_data *dest_apic=&(state->apics[i]);
306                 if (dest_apic->present && (i!=src_apic || icr->dst_shorthand==2)) { 
307                     if (deliver(src_apic,dest_apic,icr,state,extirq)) { 
308                         return -1;
309                     }
310                 }
311             }
312         }
313             break;
314
315         default:
316             return -1;
317     }
318     
319
320     return 0;
321 }
322
323
324
325 /* THIS IS A BIG ASSUMPTION: APIC PHYSID == LOGID == CORENUM */
326
327 int v3_icc_register_apic(struct guest_info  * core, struct vm_device * icc_bus, 
328                          uint8_t apic_num, struct v3_icc_ops * ops, void * priv_data) {
329     struct icc_bus_state * icc = (struct icc_bus_state *)icc_bus->private_data;
330     struct apic_data * apic = &(icc->apics[apic_num]);
331
332     if (apic->present == 1) {
333         PrintError("icc_bus: Attempt to re-register apic %u\n", apic_num);
334         return -1;
335     }
336     
337     apic->present = 1;
338     apic->priv_data = priv_data;
339     apic->core = core;
340     apic->ops = ops;
341    
342     PrintDebug("icc_bus: Registered apic %u\n", apic_num);
343
344     return 0;
345 }
346
347
348 int v3_icc_register_ioapic(struct v3_vm_info *vm, struct vm_device * icc_bus, uint8_t apic_num)
349 {
350     struct icc_bus_state * icc = (struct icc_bus_state *)icc_bus->private_data;
351
352     if (icc->ioapic_id) { 
353         PrintError("icc_bus: Attempt to register a second ioapic!\n");
354         return -1;
355     }
356
357     icc->ioapic_id=apic_num;
358
359     PrintDebug("icc_bus: Registered ioapic %u\n", apic_num);
360     
361
362     return 0;
363 }
364
365
366 static int icc_bus_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
367     PrintDebug("icc_bus: Creating ICC_BUS\n");
368
369     char * dev_id = v3_cfg_val(cfg, "ID");
370
371     struct icc_bus_state * icc_bus = (struct icc_bus_state *)V3_Malloc(sizeof(struct icc_bus_state));
372     memset(icc_bus, 0, sizeof(struct icc_bus_state));
373
374     struct vm_device * dev = v3_allocate_device(dev_id, &dev_ops, icc_bus);
375
376     if (v3_attach_device(vm, dev) == -1) {
377         PrintError("icc_bus: Could not attach device %s\n", dev_id);
378         return -1;
379     }
380
381     return 0;
382 }
383
384
385
386 device_register("ICC_BUS", icc_bus_init)