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.


Functional 2 core linux guest
[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 int v3_icc_send_ipi(struct vm_device * icc_bus, uint32_t src_apic, uint64_t icr_data, 
205                     uint32_t dfr_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     struct dst_fmt_reg *dfr = (struct dst_fmt_reg*)&dfr_data;
211     struct icc_bus_state * state = (struct icc_bus_state *)icc_bus->private_data;
212
213     // initial sanity checks
214     if (src_apic>=MAX_APICS || (!state->apics[src_apic].present && src_apic!=state->ioapic_id)) { 
215         PrintError("icc_bus: Apparently sending from unregistered apic id=%u\n",src_apic);
216         return -1;
217     }
218     if (icr->dst_mode==0  && !state->apics[icr->dst].present) { 
219         PrintError("icc_bus: Attempted send to unregistered apic id=%u\n",icr->dst);
220         return -1;
221     }
222
223     PrintDebug("icc_bus: IPI %s %u from %s %u to %s %s %u (icr=0x%llx, dfr=0x%x) (extirq=%u)\n",
224                deliverymode_str[icr->del_mode], icr->vec, 
225                src_apic==state->ioapic_id ? "ioapic" : "apic",
226                src_apic,               
227                icr->dst_mode==0 ? "(physical)" : "(logical)", 
228                shorthand_str[icr->dst_shorthand], icr->dst,icr->val, dfr->val,
229                extirq);
230
231     /*
232
233     if (icr->dst==state->ioapic_id) { 
234         PrintError("icc_bus: Attempted send to ioapic ignored\n");
235         return -1;
236     }
237     */
238
239
240
241     switch (icr->dst_shorthand) {
242
243         case 0:  // no shorthand
244             if (icr->dst_mode==0) { 
245                 // physical delivery
246                 struct apic_data * dest_apic =  &(state->apics[icr->dst]);
247                 if (deliver(src_apic,dest_apic,icr,state,extirq)) { 
248                     return -1;
249                 }
250             } else {
251                 // logical delivery
252                 uint8_t mda = icr->dst; // message destination address, not physical address
253                 
254                 if (dfr->model==0xf) { 
255                     // flat model
256                     // deliver irq if
257                     // mda of sender & ldr of receiver is nonzero
258                     // mda=0xff means broadcaset to all
259                     
260                     int i;
261                     for (i=0;i<MAX_APICS;i++) { 
262                         struct apic_data *dest_apic=&(state->apics[i]);
263                         if (dest_apic->present &&
264                             dest_apic->ops->should_deliver_flat(dest_apic->core,
265                                                                 mda,
266                                                                 dest_apic->priv_data)) { 
267                             if (deliver(src_apic,dest_apic,icr,state,extirq)) { 
268                                 return -1;
269                             }
270                         }
271                     }
272                 } else {
273                     // cluster model
274                     PrintError("icc_bus: use of cluster model not yet supported\n");
275                     return -1;
276                 }
277             }
278                 
279             break;
280
281         case 1:  // self
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             break;
291
292         case 2: 
293         case 3: { // all and all-but-me
294             int i;
295             for (i=0;i<MAX_APICS;i++) { 
296                 struct apic_data *dest_apic=&(state->apics[i]);
297                 if (dest_apic->present && (i!=src_apic || icr->dst_shorthand==2)) { 
298                     if (deliver(src_apic,dest_apic,icr,state,extirq)) { 
299                         return -1;
300                     }
301                 }
302             }
303         }
304             break;
305             }
306
307     return 0;
308 }
309
310
311
312 /* THIS IS A BIG ASSUMPTION: APIC PHYSID == LOGID == CORENUM */
313
314 int v3_icc_register_apic(struct guest_info  * core, struct vm_device * icc_bus, 
315                          uint8_t apic_num, struct v3_icc_ops * ops, void * priv_data) {
316     struct icc_bus_state * icc = (struct icc_bus_state *)icc_bus->private_data;
317     struct apic_data * apic = &(icc->apics[apic_num]);
318
319     if (apic->present == 1) {
320         PrintError("icc_bus: Attempt to re-register apic %u\n", apic_num);
321         return -1;
322     }
323     
324     apic->present = 1;
325     apic->priv_data = priv_data;
326     apic->core = core;
327     apic->ops = ops;
328    
329     PrintDebug("icc_bus: Registered apic %u\n", apic_num);
330
331     return 0;
332 }
333
334
335 int v3_icc_register_ioapic(struct v3_vm_info *vm, struct vm_device * icc_bus, uint8_t apic_num)
336 {
337     struct icc_bus_state * icc = (struct icc_bus_state *)icc_bus->private_data;
338
339     if (icc->ioapic_id) { 
340         PrintError("icc_bus: Attempt to register a second ioapic!\n");
341         return -1;
342     }
343
344     icc->ioapic_id=apic_num;
345
346     PrintDebug("icc_bus: Registered ioapic %u\n", apic_num);
347     
348
349     return 0;
350 }
351
352
353
354 static int icc_bus_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
355     PrintDebug("icc_bus: Creating ICC_BUS\n");
356
357     char * name = v3_cfg_val(cfg, "name");
358
359     struct icc_bus_state * icc_bus = (struct icc_bus_state *)V3_Malloc(sizeof(struct icc_bus_state));
360     memset(icc_bus, 0, sizeof(struct icc_bus_state));
361
362     struct vm_device * dev = v3_allocate_device(name, &dev_ops, icc_bus);
363
364     if (v3_attach_device(vm, dev) == -1) {
365         PrintError("icc_bus: Could not attach device %s\n", name);
366         return -1;
367     }
368
369     return 0;
370 }
371
372
373
374 device_register("ICC_BUS", icc_bus_init)