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.


79f91596bc8c20177d688b909d5449a9cd01242f
[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, ignored\n",core->cpu_id);
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, ignored!\n",core->cpu_id);
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     PrintDebug("icc_bus: icc_bus=%p, src_apic=%u, icr_data=%llx, extirq=%u\n",icc_bus,src_apic,icr_data,extirq);
208
209     struct int_cmd_reg *icr = (struct int_cmd_reg *)&icr_data;
210
211     struct icc_bus_state * state = (struct icc_bus_state *)icc_bus->private_data;
212     struct apic_data * dest_apic = NULL;
213     PrintDebug("icc_bus: icc_bus=%p, src_apic=%u, icr_data=%llx, extirq=%u\n", 
214                icc_bus, src_apic, icr_data, extirq);
215
216     // initial sanity checks
217     if ((src_apic >= MAX_APICS) || 
218         ((state->apics[src_apic].present == 0) && 
219          (src_apic != state->ioapic_id))) { 
220         PrintError("icc_bus: Apparently sending from unregistered apic id=%u\n",src_apic);
221         return -1;
222     }
223
224
225     if ((icr->dst_mode == 0) && (state->apics[icr->dst].present == 0)) { 
226         PrintError("icc_bus: Attempted send to unregistered apic id=%u\n", icr->dst);
227         return -1;
228     }
229
230     dest_apic =  &(state->apics[icr->dst]);
231
232
233     PrintDebug("icc_bus: IPI %s %u from %s %u to %s %s %u (icr=0x%llx, extirq=%u)\n",
234                deliverymode_str[icr->del_mode], icr->vec, 
235                src_apic==state->ioapic_id ? "ioapic" : "apic",
236                src_apic,               
237                icr->dst_mode==0 ? "(physical)" : "(logical)", 
238                shorthand_str[icr->dst_shorthand], icr->dst,icr->val,
239                extirq);
240
241     /*
242
243     if (icr->dst==state->ioapic_id) { 
244         PrintError("icc_bus: Attempted send to ioapic ignored\n");
245         return -1;
246     }
247     */
248
249
250
251     switch (icr->dst_shorthand) {
252
253         case 0:  // no shorthand
254
255             if (icr->dst_mode==0) { 
256                 // physical delivery
257                 struct apic_data * dest_apic =  &(state->apics[icr->dst]);
258                 if (deliver(src_apic,dest_apic,icr,state,extirq)) { 
259                     return -1;
260                 }
261             } else {
262                 // logical delivery
263                 int i;
264                 uint8_t mda = icr->dst;
265                 for (i=0;i<MAX_APICS;i++) { 
266                     struct apic_data *dest_apic=&(state->apics[i]);
267                     if (dest_apic->present &&
268                         dest_apic->ops->should_deliver(dest_apic->core,
269                                                        mda,
270                                                        dest_apic->priv_data)) {
271                         if (deliver(src_apic,dest_apic,icr,state,extirq)) { 
272                             return -1;
273                         }
274                     }
275                 }
276             }
277             
278             break;
279             
280         case 1:  // self
281
282             if (icr->dst_mode==0) { 
283                 // physical delivery
284                 if (icr->dst==state->ioapic_id) { 
285                     PrintError("icc_bus: ioapic attempting to send to itself\n");
286                     return -1;
287                 }
288                 struct apic_data *dest_apic=&(state->apics[src_apic]);
289                 if (deliver(src_apic,dest_apic,icr,state,extirq)) { 
290                     return -1;
291                 }
292             } else {
293                 // logical delivery
294                 PrintError("icc_bus: use of logical delivery in self is not yet supported.\n");
295
296                 return -1;
297             }
298             break;
299             
300         case 2: 
301
302         case 3: { // all and all-but-me
303             // assuming that logical verus physical doesn't matter
304             // although it is odd that both are used
305             int i;
306             for (i=0;i<MAX_APICS;i++) { 
307                 struct apic_data *dest_apic=&(state->apics[i]);
308                 if (dest_apic->present && (i!=src_apic || icr->dst_shorthand==2)) { 
309                     if (deliver(src_apic,dest_apic,icr,state,extirq)) { 
310                         return -1;
311                     }
312                 }
313             }
314         }
315             break;
316
317         default:
318             return -1;
319     }
320     
321
322     return 0;
323 }
324
325
326
327 /* THIS IS A BIG ASSUMPTION: APIC PHYSID == LOGID == CORENUM */
328
329 int v3_icc_register_apic(struct guest_info  * core, struct vm_device * icc_bus, 
330                          uint8_t apic_num, struct v3_icc_ops * ops, void * priv_data) {
331     struct icc_bus_state * icc = (struct icc_bus_state *)icc_bus->private_data;
332     struct apic_data * apic = &(icc->apics[apic_num]);
333
334     if (apic->present == 1) {
335         PrintError("icc_bus: Attempt to re-register apic %u\n", apic_num);
336         return -1;
337     }
338     
339     apic->present = 1;
340     apic->priv_data = priv_data;
341     apic->core = core;
342     apic->ops = ops;
343    
344     PrintDebug("icc_bus: Registered apic %u\n", apic_num);
345
346     return 0;
347 }
348
349
350 int v3_icc_register_ioapic(struct v3_vm_info *vm, struct vm_device * icc_bus, uint8_t apic_num)
351 {
352     struct icc_bus_state * icc = (struct icc_bus_state *)icc_bus->private_data;
353
354     if (icc->ioapic_id) { 
355         PrintError("icc_bus: Attempt to register a second ioapic!\n");
356         return -1;
357     }
358
359     icc->ioapic_id=apic_num;
360
361     PrintDebug("icc_bus: Registered ioapic %u\n", apic_num);
362     
363
364     return 0;
365 }
366
367
368 static int icc_bus_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
369     PrintDebug("icc_bus: Creating ICC_BUS\n");
370
371     char * dev_id = v3_cfg_val(cfg, "ID");
372
373     struct icc_bus_state * icc_bus = (struct icc_bus_state *)V3_Malloc(sizeof(struct icc_bus_state));
374     memset(icc_bus, 0, sizeof(struct icc_bus_state));
375
376     struct vm_device * dev = v3_allocate_device(dev_id, &dev_ops, icc_bus);
377
378     if (v3_attach_device(vm, dev) == -1) {
379         PrintError("icc_bus: Could not attach device %s\n", dev_id);
380         return -1;
381     }
382
383     return 0;
384 }
385
386
387
388 device_register("ICC_BUS", icc_bus_init)