Commit | Line | Data |
---|---|---|
f87e4cac JF |
1 | /* |
2 | * Xen SMP support | |
3 | * | |
4 | * This file implements the Xen versions of smp_ops. SMP under Xen is | |
5 | * very straightforward. Bringing a CPU up is simply a matter of | |
6 | * loading its initial context and setting it running. | |
7 | * | |
8 | * IPIs are handled through the Xen event mechanism. | |
9 | * | |
10 | * Because virtual CPUs can be scheduled onto any real CPU, there's no | |
11 | * useful topology information for the kernel to make use of. As a | |
12 | * result, all CPUs are treated as if they're single-core and | |
13 | * single-threaded. | |
f87e4cac JF |
14 | */ |
15 | #include <linux/sched.h> | |
16 | #include <linux/err.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
f87e4cac | 18 | #include <linux/smp.h> |
1ff2b0c3 | 19 | #include <linux/irq_work.h> |
466318a8 | 20 | #include <linux/tick.h> |
f87e4cac JF |
21 | |
22 | #include <asm/paravirt.h> | |
23 | #include <asm/desc.h> | |
24 | #include <asm/pgtable.h> | |
25 | #include <asm/cpu.h> | |
26 | ||
27 | #include <xen/interface/xen.h> | |
28 | #include <xen/interface/vcpu.h> | |
29 | ||
30 | #include <asm/xen/interface.h> | |
31 | #include <asm/xen/hypercall.h> | |
32 | ||
ea5b8f73 | 33 | #include <xen/xen.h> |
f87e4cac JF |
34 | #include <xen/page.h> |
35 | #include <xen/events.h> | |
36 | ||
ed467e69 | 37 | #include <xen/hvc-console.h> |
f87e4cac JF |
38 | #include "xen-ops.h" |
39 | #include "mmu.h" | |
40 | ||
b78936e1 | 41 | cpumask_var_t xen_cpu_initialized_map; |
f87e4cac | 42 | |
9547689f KRW |
43 | struct xen_common_irq { |
44 | int irq; | |
45 | char *name; | |
46 | }; | |
ee336e10 KRW |
47 | static DEFINE_PER_CPU(struct xen_common_irq, xen_resched_irq) = { .irq = -1 }; |
48 | static DEFINE_PER_CPU(struct xen_common_irq, xen_callfunc_irq) = { .irq = -1 }; | |
49 | static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq) = { .irq = -1 }; | |
50 | static DEFINE_PER_CPU(struct xen_common_irq, xen_irq_work) = { .irq = -1 }; | |
9547689f | 51 | static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 }; |
f87e4cac JF |
52 | |
53 | static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id); | |
3b16cf87 | 54 | static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id); |
1ff2b0c3 | 55 | static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id); |
f87e4cac JF |
56 | |
57 | /* | |
184748cc | 58 | * Reschedule call back. |
f87e4cac JF |
59 | */ |
60 | static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id) | |
61 | { | |
1b437c8c | 62 | inc_irq_stat(irq_resched_count); |
184748cc | 63 | scheduler_ipi(); |
38bb5ab4 | 64 | |
f87e4cac JF |
65 | return IRQ_HANDLED; |
66 | } | |
67 | ||
148f9bb8 | 68 | static void cpu_bringup(void) |
f87e4cac | 69 | { |
e8c9e788 | 70 | int cpu; |
f87e4cac JF |
71 | |
72 | cpu_init(); | |
d68d82af | 73 | touch_softlockup_watchdog(); |
c7b75947 JF |
74 | preempt_disable(); |
75 | ||
5840c84b MR |
76 | /* PVH runs in ring 0 and allows us to do native syscalls. Yay! */ |
77 | if (!xen_feature(XENFEAT_supervisor_mode_kernel)) { | |
78 | xen_enable_sysenter(); | |
79 | xen_enable_syscall(); | |
80 | } | |
c7b75947 JF |
81 | cpu = smp_processor_id(); |
82 | smp_store_cpu_info(cpu); | |
83 | cpu_data(cpu).x86_max_cores = 1; | |
84 | set_cpu_sibling_map(cpu); | |
f87e4cac JF |
85 | |
86 | xen_setup_cpu_clockevents(); | |
87 | ||
106b4438 KRW |
88 | notify_cpu_starting(cpu); |
89 | ||
d7d3756c | 90 | set_cpu_online(cpu, true); |
106b4438 | 91 | |
2113f469 | 92 | this_cpu_write(cpu_state, CPU_ONLINE); |
106b4438 | 93 | |
c7b75947 JF |
94 | wmb(); |
95 | ||
f87e4cac JF |
96 | /* We can take interrupts now: we're officially "up". */ |
97 | local_irq_enable(); | |
98 | ||
99 | wmb(); /* make sure everything is out */ | |
d68d82af AN |
100 | } |
101 | ||
5840c84b MR |
102 | /* Note: cpu parameter is only relevant for PVH */ |
103 | static void cpu_bringup_and_idle(int cpu) | |
d68d82af | 104 | { |
5840c84b MR |
105 | #ifdef CONFIG_X86_64 |
106 | if (xen_feature(XENFEAT_auto_translated_physmap) && | |
107 | xen_feature(XENFEAT_supervisor_mode_kernel)) | |
c9f6e997 | 108 | xen_pvh_secondary_vcpu_init(cpu); |
5840c84b | 109 | #endif |
d68d82af | 110 | cpu_bringup(); |
7d1a9417 | 111 | cpu_startup_entry(CPUHP_ONLINE); |
f87e4cac JF |
112 | } |
113 | ||
53b94fdc KRW |
114 | static void xen_smp_intr_free(unsigned int cpu) |
115 | { | |
ee336e10 | 116 | if (per_cpu(xen_resched_irq, cpu).irq >= 0) { |
9547689f | 117 | unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu).irq, NULL); |
ee336e10 | 118 | per_cpu(xen_resched_irq, cpu).irq = -1; |
b85fffec KRW |
119 | kfree(per_cpu(xen_resched_irq, cpu).name); |
120 | per_cpu(xen_resched_irq, cpu).name = NULL; | |
ee336e10 KRW |
121 | } |
122 | if (per_cpu(xen_callfunc_irq, cpu).irq >= 0) { | |
9547689f | 123 | unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu).irq, NULL); |
ee336e10 | 124 | per_cpu(xen_callfunc_irq, cpu).irq = -1; |
b85fffec KRW |
125 | kfree(per_cpu(xen_callfunc_irq, cpu).name); |
126 | per_cpu(xen_callfunc_irq, cpu).name = NULL; | |
ee336e10 KRW |
127 | } |
128 | if (per_cpu(xen_debug_irq, cpu).irq >= 0) { | |
9547689f | 129 | unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu).irq, NULL); |
ee336e10 | 130 | per_cpu(xen_debug_irq, cpu).irq = -1; |
b85fffec KRW |
131 | kfree(per_cpu(xen_debug_irq, cpu).name); |
132 | per_cpu(xen_debug_irq, cpu).name = NULL; | |
ee336e10 KRW |
133 | } |
134 | if (per_cpu(xen_callfuncsingle_irq, cpu).irq >= 0) { | |
9547689f | 135 | unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu).irq, |
53b94fdc | 136 | NULL); |
ee336e10 | 137 | per_cpu(xen_callfuncsingle_irq, cpu).irq = -1; |
b85fffec KRW |
138 | kfree(per_cpu(xen_callfuncsingle_irq, cpu).name); |
139 | per_cpu(xen_callfuncsingle_irq, cpu).name = NULL; | |
ee336e10 | 140 | } |
53b94fdc KRW |
141 | if (xen_hvm_domain()) |
142 | return; | |
143 | ||
ee336e10 | 144 | if (per_cpu(xen_irq_work, cpu).irq >= 0) { |
9547689f | 145 | unbind_from_irqhandler(per_cpu(xen_irq_work, cpu).irq, NULL); |
ee336e10 | 146 | per_cpu(xen_irq_work, cpu).irq = -1; |
b85fffec KRW |
147 | kfree(per_cpu(xen_irq_work, cpu).name); |
148 | per_cpu(xen_irq_work, cpu).name = NULL; | |
ee336e10 | 149 | } |
53b94fdc | 150 | }; |
f87e4cac JF |
151 | static int xen_smp_intr_init(unsigned int cpu) |
152 | { | |
153 | int rc; | |
b85fffec | 154 | char *resched_name, *callfunc_name, *debug_name; |
f87e4cac JF |
155 | |
156 | resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu); | |
157 | rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR, | |
158 | cpu, | |
159 | xen_reschedule_interrupt, | |
9d71cee6 | 160 | IRQF_PERCPU|IRQF_NOBALANCING, |
f87e4cac JF |
161 | resched_name, |
162 | NULL); | |
163 | if (rc < 0) | |
164 | goto fail; | |
9547689f | 165 | per_cpu(xen_resched_irq, cpu).irq = rc; |
b85fffec | 166 | per_cpu(xen_resched_irq, cpu).name = resched_name; |
f87e4cac JF |
167 | |
168 | callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu); | |
169 | rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR, | |
170 | cpu, | |
171 | xen_call_function_interrupt, | |
9d71cee6 | 172 | IRQF_PERCPU|IRQF_NOBALANCING, |
f87e4cac JF |
173 | callfunc_name, |
174 | NULL); | |
175 | if (rc < 0) | |
176 | goto fail; | |
9547689f | 177 | per_cpu(xen_callfunc_irq, cpu).irq = rc; |
b85fffec | 178 | per_cpu(xen_callfunc_irq, cpu).name = callfunc_name; |
f87e4cac | 179 | |
ee523ca1 JF |
180 | debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu); |
181 | rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt, | |
9d71cee6 | 182 | IRQF_PERCPU | IRQF_NOBALANCING, |
ee523ca1 JF |
183 | debug_name, NULL); |
184 | if (rc < 0) | |
185 | goto fail; | |
9547689f | 186 | per_cpu(xen_debug_irq, cpu).irq = rc; |
b85fffec | 187 | per_cpu(xen_debug_irq, cpu).name = debug_name; |
ee523ca1 | 188 | |
3b16cf87 JA |
189 | callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu); |
190 | rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR, | |
191 | cpu, | |
192 | xen_call_function_single_interrupt, | |
9d71cee6 | 193 | IRQF_PERCPU|IRQF_NOBALANCING, |
3b16cf87 JA |
194 | callfunc_name, |
195 | NULL); | |
196 | if (rc < 0) | |
197 | goto fail; | |
9547689f | 198 | per_cpu(xen_callfuncsingle_irq, cpu).irq = rc; |
b85fffec | 199 | per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name; |
3b16cf87 | 200 | |
27d8b207 KRW |
201 | /* |
202 | * The IRQ worker on PVHVM goes through the native path and uses the | |
203 | * IPI mechanism. | |
204 | */ | |
205 | if (xen_hvm_domain()) | |
206 | return 0; | |
207 | ||
1ff2b0c3 LM |
208 | callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu); |
209 | rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR, | |
210 | cpu, | |
211 | xen_irq_work_interrupt, | |
9d71cee6 | 212 | IRQF_PERCPU|IRQF_NOBALANCING, |
1ff2b0c3 LM |
213 | callfunc_name, |
214 | NULL); | |
215 | if (rc < 0) | |
216 | goto fail; | |
9547689f | 217 | per_cpu(xen_irq_work, cpu).irq = rc; |
b85fffec | 218 | per_cpu(xen_irq_work, cpu).name = callfunc_name; |
1ff2b0c3 | 219 | |
f87e4cac JF |
220 | return 0; |
221 | ||
222 | fail: | |
53b94fdc | 223 | xen_smp_intr_free(cpu); |
f87e4cac JF |
224 | return rc; |
225 | } | |
226 | ||
c7b75947 | 227 | static void __init xen_fill_possible_map(void) |
f87e4cac JF |
228 | { |
229 | int i, rc; | |
230 | ||
ea5b8f73 SS |
231 | if (xen_initial_domain()) |
232 | return; | |
233 | ||
234 | for (i = 0; i < nr_cpu_ids; i++) { | |
235 | rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL); | |
236 | if (rc >= 0) { | |
237 | num_processors++; | |
238 | set_cpu_possible(i, true); | |
239 | } | |
240 | } | |
241 | } | |
242 | ||
243 | static void __init xen_filter_cpu_maps(void) | |
244 | { | |
245 | int i, rc; | |
cf405ae6 | 246 | unsigned int subtract = 0; |
ea5b8f73 SS |
247 | |
248 | if (!xen_initial_domain()) | |
249 | return; | |
250 | ||
801fd14a SS |
251 | num_processors = 0; |
252 | disabled_cpus = 0; | |
e7986739 | 253 | for (i = 0; i < nr_cpu_ids; i++) { |
f87e4cac | 254 | rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL); |
4560a294 JF |
255 | if (rc >= 0) { |
256 | num_processors++; | |
4f062896 | 257 | set_cpu_possible(i, true); |
801fd14a SS |
258 | } else { |
259 | set_cpu_possible(i, false); | |
260 | set_cpu_present(i, false); | |
cf405ae6 | 261 | subtract++; |
4560a294 | 262 | } |
f87e4cac | 263 | } |
cf405ae6 KRW |
264 | #ifdef CONFIG_HOTPLUG_CPU |
265 | /* This is akin to using 'nr_cpus' on the Linux command line. | |
266 | * Which is OK as when we use 'dom0_max_vcpus=X' we can only | |
267 | * have up to X, while nr_cpu_ids is greater than X. This | |
268 | * normally is not a problem, except when CPU hotplugging | |
269 | * is involved and then there might be more than X CPUs | |
270 | * in the guest - which will not work as there is no | |
271 | * hypercall to expand the max number of VCPUs an already | |
272 | * running guest has. So cap it up to X. */ | |
273 | if (subtract) | |
274 | nr_cpu_ids = nr_cpu_ids - subtract; | |
275 | #endif | |
276 | ||
f87e4cac JF |
277 | } |
278 | ||
a9e7062d | 279 | static void __init xen_smp_prepare_boot_cpu(void) |
f87e4cac | 280 | { |
f87e4cac JF |
281 | BUG_ON(smp_processor_id() != 0); |
282 | native_smp_prepare_boot_cpu(); | |
283 | ||
26a79995 | 284 | if (xen_pv_domain()) { |
5840c84b MR |
285 | if (!xen_feature(XENFEAT_writable_page_tables)) |
286 | /* We've switched to the "real" per-cpu gdt, so make | |
287 | * sure the old memory can be recycled. */ | |
288 | make_lowmem_page_readwrite(xen_initial_gdt); | |
60223a32 | 289 | |
7cde9b27 FZ |
290 | #ifdef CONFIG_X86_32 |
291 | /* | |
292 | * Xen starts us with XEN_FLAT_RING1_DS, but linux code | |
293 | * expects __USER_DS | |
294 | */ | |
295 | loadsegment(ds, __USER_DS); | |
296 | loadsegment(es, __USER_DS); | |
297 | #endif | |
298 | ||
26a79995 KRW |
299 | xen_filter_cpu_maps(); |
300 | xen_setup_vcpu_info_placement(); | |
301 | } | |
302 | /* | |
303 | * The alternative logic (which patches the unlock/lock) runs before | |
304 | * the smp bootup up code is activated. Hence we need to set this up | |
305 | * the core kernel is being patched. Otherwise we will have only | |
306 | * modules patched but not core code. | |
307 | */ | |
bf7aab3a | 308 | xen_init_spinlocks(); |
f87e4cac JF |
309 | } |
310 | ||
a9e7062d | 311 | static void __init xen_smp_prepare_cpus(unsigned int max_cpus) |
f87e4cac JF |
312 | { |
313 | unsigned cpu; | |
900cba88 | 314 | unsigned int i; |
f87e4cac | 315 | |
ed467e69 KRW |
316 | if (skip_ioapic_setup) { |
317 | char *m = (max_cpus == 0) ? | |
318 | "The nosmp parameter is incompatible with Xen; " \ | |
319 | "use Xen dom0_max_vcpus=1 parameter" : | |
320 | "The noapic parameter is incompatible with Xen"; | |
321 | ||
322 | xen_raw_printk(m); | |
323 | panic(m); | |
324 | } | |
2d9e1e2f JF |
325 | xen_init_lock_cpu(0); |
326 | ||
06d0b5d9 | 327 | smp_store_boot_cpu_info(); |
c7b75947 | 328 | cpu_data(0).x86_max_cores = 1; |
900cba88 AJ |
329 | |
330 | for_each_possible_cpu(i) { | |
331 | zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL); | |
332 | zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL); | |
333 | zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL); | |
334 | } | |
f87e4cac JF |
335 | set_cpu_sibling_map(0); |
336 | ||
337 | if (xen_smp_intr_init(0)) | |
338 | BUG(); | |
339 | ||
b78936e1 MT |
340 | if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL)) |
341 | panic("could not allocate xen_cpu_initialized_map\n"); | |
342 | ||
343 | cpumask_copy(xen_cpu_initialized_map, cpumask_of(0)); | |
f87e4cac JF |
344 | |
345 | /* Restrict the possible_map according to max_cpus. */ | |
346 | while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) { | |
e7986739 | 347 | for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--) |
f87e4cac | 348 | continue; |
4f062896 | 349 | set_cpu_possible(cpu, false); |
f87e4cac JF |
350 | } |
351 | ||
7eb43a6d | 352 | for_each_possible_cpu(cpu) |
4f062896 | 353 | set_cpu_present(cpu, true); |
f87e4cac JF |
354 | } |
355 | ||
148f9bb8 | 356 | static int |
f87e4cac JF |
357 | cpu_initialize_context(unsigned int cpu, struct task_struct *idle) |
358 | { | |
359 | struct vcpu_guest_context *ctxt; | |
c7b75947 | 360 | struct desc_struct *gdt; |
9976b39b | 361 | unsigned long gdt_mfn; |
f87e4cac | 362 | |
b78936e1 | 363 | if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map)) |
f87e4cac JF |
364 | return 0; |
365 | ||
366 | ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL); | |
367 | if (ctxt == NULL) | |
368 | return -ENOMEM; | |
369 | ||
c7b75947 JF |
370 | gdt = get_cpu_gdt_table(cpu); |
371 | ||
c7b75947 | 372 | #ifdef CONFIG_X86_32 |
5840c84b | 373 | /* Note: PVH is not yet supported on x86_32. */ |
c7b75947 | 374 | ctxt->user_regs.fs = __KERNEL_PERCPU; |
577eebea | 375 | ctxt->user_regs.gs = __KERNEL_STACK_CANARY; |
c7b75947 | 376 | #endif |
f87e4cac | 377 | ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle; |
f87e4cac JF |
378 | |
379 | memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt)); | |
380 | ||
5840c84b MR |
381 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { |
382 | ctxt->flags = VGCF_IN_KERNEL; | |
dacd45f4 KRW |
383 | ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */ |
384 | ctxt->user_regs.ds = __USER_DS; | |
385 | ctxt->user_regs.es = __USER_DS; | |
5840c84b | 386 | ctxt->user_regs.ss = __KERNEL_DS; |
f87e4cac | 387 | |
dacd45f4 | 388 | xen_copy_trap_info(ctxt->trap_ctxt); |
f87e4cac | 389 | |
dacd45f4 | 390 | ctxt->ldt_ents = 0; |
9976b39b | 391 | |
dacd45f4 | 392 | BUG_ON((unsigned long)gdt & ~PAGE_MASK); |
f87e4cac | 393 | |
dacd45f4 KRW |
394 | gdt_mfn = arbitrary_virt_to_mfn(gdt); |
395 | make_lowmem_page_readonly(gdt); | |
396 | make_lowmem_page_readonly(mfn_to_virt(gdt_mfn)); | |
f87e4cac | 397 | |
dacd45f4 KRW |
398 | ctxt->gdt_frames[0] = gdt_mfn; |
399 | ctxt->gdt_ents = GDT_ENTRIES; | |
f87e4cac | 400 | |
dacd45f4 KRW |
401 | ctxt->kernel_ss = __KERNEL_DS; |
402 | ctxt->kernel_sp = idle->thread.sp0; | |
f87e4cac | 403 | |
c7b75947 | 404 | #ifdef CONFIG_X86_32 |
dacd45f4 KRW |
405 | ctxt->event_callback_cs = __KERNEL_CS; |
406 | ctxt->failsafe_callback_cs = __KERNEL_CS; | |
5840c84b MR |
407 | #else |
408 | ctxt->gs_base_kernel = per_cpu_offset(cpu); | |
c7b75947 | 409 | #endif |
dacd45f4 KRW |
410 | ctxt->event_callback_eip = |
411 | (unsigned long)xen_hypervisor_callback; | |
412 | ctxt->failsafe_callback_eip = | |
413 | (unsigned long)xen_failsafe_callback; | |
5840c84b MR |
414 | ctxt->user_regs.cs = __KERNEL_CS; |
415 | per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir); | |
416 | #ifdef CONFIG_X86_32 | |
dacd45f4 | 417 | } |
5840c84b MR |
418 | #else |
419 | } else | |
420 | /* N.B. The user_regs.eip (cpu_bringup_and_idle) is called with | |
421 | * %rdi having the cpu number - which means are passing in | |
422 | * as the first parameter the cpu. Subtle! | |
423 | */ | |
424 | ctxt->user_regs.rdi = cpu; | |
425 | #endif | |
dacd45f4 | 426 | ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs); |
f87e4cac | 427 | ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir)); |
f87e4cac JF |
428 | if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt)) |
429 | BUG(); | |
430 | ||
431 | kfree(ctxt); | |
432 | return 0; | |
433 | } | |
434 | ||
148f9bb8 | 435 | static int xen_cpu_up(unsigned int cpu, struct task_struct *idle) |
f87e4cac | 436 | { |
f87e4cac JF |
437 | int rc; |
438 | ||
c6f5e0ac | 439 | per_cpu(current_task, cpu) = idle; |
c7b75947 | 440 | #ifdef CONFIG_X86_32 |
f87e4cac | 441 | irq_ctx_init(cpu); |
c7b75947 | 442 | #else |
c7b75947 | 443 | clear_tsk_thread_flag(idle, TIF_FORK); |
4461bbc0 | 444 | #endif |
38341432 JF |
445 | per_cpu(kernel_stack, cpu) = |
446 | (unsigned long)task_stack_page(idle) - | |
447 | KERNEL_STACK_OFFSET + THREAD_SIZE; | |
4461bbc0 | 448 | |
02889672 | 449 | xen_setup_runstate_info(cpu); |
f87e4cac | 450 | xen_setup_timer(cpu); |
2d9e1e2f | 451 | xen_init_lock_cpu(cpu); |
f87e4cac | 452 | |
c7b75947 JF |
453 | per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; |
454 | ||
f87e4cac JF |
455 | /* make sure interrupts start blocked */ |
456 | per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1; | |
457 | ||
458 | rc = cpu_initialize_context(cpu, idle); | |
459 | if (rc) | |
460 | return rc; | |
461 | ||
462 | if (num_online_cpus() == 1) | |
816afe4f RR |
463 | /* Just in case we booted with a single CPU. */ |
464 | alternatives_enable_smp(); | |
f87e4cac JF |
465 | |
466 | rc = xen_smp_intr_init(cpu); | |
467 | if (rc) | |
468 | return rc; | |
469 | ||
f87e4cac JF |
470 | rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL); |
471 | BUG_ON(rc); | |
472 | ||
c7b75947 | 473 | while(per_cpu(cpu_state, cpu) != CPU_ONLINE) { |
1207cf8e | 474 | HYPERVISOR_sched_op(SCHEDOP_yield, NULL); |
c7b75947 JF |
475 | barrier(); |
476 | } | |
477 | ||
f87e4cac JF |
478 | return 0; |
479 | } | |
480 | ||
a9e7062d | 481 | static void xen_smp_cpus_done(unsigned int max_cpus) |
f87e4cac JF |
482 | { |
483 | } | |
484 | ||
2737146b | 485 | #ifdef CONFIG_HOTPLUG_CPU |
26fd1051 | 486 | static int xen_cpu_disable(void) |
d68d82af AN |
487 | { |
488 | unsigned int cpu = smp_processor_id(); | |
489 | if (cpu == 0) | |
490 | return -EBUSY; | |
491 | ||
492 | cpu_disable_common(); | |
493 | ||
494 | load_cr3(swapper_pg_dir); | |
495 | return 0; | |
496 | } | |
497 | ||
26fd1051 | 498 | static void xen_cpu_die(unsigned int cpu) |
d68d82af | 499 | { |
b12abaa1 | 500 | while (xen_pv_domain() && HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) { |
d68d82af AN |
501 | current->state = TASK_UNINTERRUPTIBLE; |
502 | schedule_timeout(HZ/10); | |
503 | } | |
53b94fdc | 504 | xen_smp_intr_free(cpu); |
d68d82af AN |
505 | xen_uninit_lock_cpu(cpu); |
506 | xen_teardown_timer(cpu); | |
d68d82af AN |
507 | } |
508 | ||
148f9bb8 | 509 | static void xen_play_dead(void) /* used only with HOTPLUG_CPU */ |
d68d82af AN |
510 | { |
511 | play_dead_common(); | |
512 | HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL); | |
513 | cpu_bringup(); | |
466318a8 KRW |
514 | /* |
515 | * commit 4b0c0f294 (tick: Cleanup NOHZ per cpu data on cpu down) | |
516 | * clears certain data that the cpu_idle loop (which called us | |
517 | * and that we return from) expects. The only way to get that | |
518 | * data back is to call: | |
519 | */ | |
520 | tick_nohz_idle_enter(); | |
d68d82af AN |
521 | } |
522 | ||
2737146b | 523 | #else /* !CONFIG_HOTPLUG_CPU */ |
26fd1051 | 524 | static int xen_cpu_disable(void) |
2737146b AN |
525 | { |
526 | return -ENOSYS; | |
527 | } | |
528 | ||
26fd1051 | 529 | static void xen_cpu_die(unsigned int cpu) |
2737146b AN |
530 | { |
531 | BUG(); | |
532 | } | |
533 | ||
26fd1051 | 534 | static void xen_play_dead(void) |
2737146b AN |
535 | { |
536 | BUG(); | |
537 | } | |
538 | ||
539 | #endif | |
f87e4cac JF |
540 | static void stop_self(void *v) |
541 | { | |
542 | int cpu = smp_processor_id(); | |
543 | ||
544 | /* make sure we're not pinning something down */ | |
545 | load_cr3(swapper_pg_dir); | |
546 | /* should set up a minimal gdt */ | |
547 | ||
086748e5 IC |
548 | set_cpu_online(cpu, false); |
549 | ||
f87e4cac JF |
550 | HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL); |
551 | BUG(); | |
552 | } | |
553 | ||
76fac077 | 554 | static void xen_stop_other_cpus(int wait) |
f87e4cac | 555 | { |
76fac077 | 556 | smp_call_function(stop_self, NULL, wait); |
f87e4cac JF |
557 | } |
558 | ||
a9e7062d | 559 | static void xen_smp_send_reschedule(int cpu) |
f87e4cac JF |
560 | { |
561 | xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR); | |
562 | } | |
563 | ||
f447d56d BG |
564 | static void __xen_send_IPI_mask(const struct cpumask *mask, |
565 | int vector) | |
f87e4cac JF |
566 | { |
567 | unsigned cpu; | |
568 | ||
bcda016e | 569 | for_each_cpu_and(cpu, mask, cpu_online_mask) |
f87e4cac JF |
570 | xen_send_IPI_one(cpu, vector); |
571 | } | |
572 | ||
bcda016e | 573 | static void xen_smp_send_call_function_ipi(const struct cpumask *mask) |
3b16cf87 JA |
574 | { |
575 | int cpu; | |
576 | ||
f447d56d | 577 | __xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR); |
3b16cf87 JA |
578 | |
579 | /* Make sure other vcpus get a chance to run if they need to. */ | |
bcda016e | 580 | for_each_cpu(cpu, mask) { |
3b16cf87 | 581 | if (xen_vcpu_stolen(cpu)) { |
1207cf8e | 582 | HYPERVISOR_sched_op(SCHEDOP_yield, NULL); |
3b16cf87 JA |
583 | break; |
584 | } | |
585 | } | |
586 | } | |
587 | ||
a9e7062d | 588 | static void xen_smp_send_call_function_single_ipi(int cpu) |
3b16cf87 | 589 | { |
f447d56d | 590 | __xen_send_IPI_mask(cpumask_of(cpu), |
e7986739 | 591 | XEN_CALL_FUNCTION_SINGLE_VECTOR); |
3b16cf87 JA |
592 | } |
593 | ||
f447d56d BG |
594 | static inline int xen_map_vector(int vector) |
595 | { | |
596 | int xen_vector; | |
597 | ||
598 | switch (vector) { | |
599 | case RESCHEDULE_VECTOR: | |
600 | xen_vector = XEN_RESCHEDULE_VECTOR; | |
601 | break; | |
602 | case CALL_FUNCTION_VECTOR: | |
603 | xen_vector = XEN_CALL_FUNCTION_VECTOR; | |
604 | break; | |
605 | case CALL_FUNCTION_SINGLE_VECTOR: | |
606 | xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR; | |
607 | break; | |
1ff2b0c3 LM |
608 | case IRQ_WORK_VECTOR: |
609 | xen_vector = XEN_IRQ_WORK_VECTOR; | |
610 | break; | |
6efa20e4 KRW |
611 | #ifdef CONFIG_X86_64 |
612 | case NMI_VECTOR: | |
613 | case APIC_DM_NMI: /* Some use that instead of NMI_VECTOR */ | |
614 | xen_vector = XEN_NMI_VECTOR; | |
615 | break; | |
616 | #endif | |
f447d56d BG |
617 | default: |
618 | xen_vector = -1; | |
619 | printk(KERN_ERR "xen: vector 0x%x is not implemented\n", | |
620 | vector); | |
621 | } | |
622 | ||
623 | return xen_vector; | |
624 | } | |
625 | ||
626 | void xen_send_IPI_mask(const struct cpumask *mask, | |
627 | int vector) | |
628 | { | |
629 | int xen_vector = xen_map_vector(vector); | |
630 | ||
631 | if (xen_vector >= 0) | |
632 | __xen_send_IPI_mask(mask, xen_vector); | |
633 | } | |
634 | ||
635 | void xen_send_IPI_all(int vector) | |
636 | { | |
637 | int xen_vector = xen_map_vector(vector); | |
638 | ||
639 | if (xen_vector >= 0) | |
640 | __xen_send_IPI_mask(cpu_online_mask, xen_vector); | |
641 | } | |
642 | ||
643 | void xen_send_IPI_self(int vector) | |
644 | { | |
645 | int xen_vector = xen_map_vector(vector); | |
646 | ||
647 | if (xen_vector >= 0) | |
648 | xen_send_IPI_one(smp_processor_id(), xen_vector); | |
649 | } | |
650 | ||
651 | void xen_send_IPI_mask_allbutself(const struct cpumask *mask, | |
652 | int vector) | |
653 | { | |
654 | unsigned cpu; | |
655 | unsigned int this_cpu = smp_processor_id(); | |
1db01b49 | 656 | int xen_vector = xen_map_vector(vector); |
f447d56d | 657 | |
1db01b49 | 658 | if (!(num_online_cpus() > 1) || (xen_vector < 0)) |
f447d56d BG |
659 | return; |
660 | ||
661 | for_each_cpu_and(cpu, mask, cpu_online_mask) { | |
662 | if (this_cpu == cpu) | |
663 | continue; | |
664 | ||
1db01b49 | 665 | xen_send_IPI_one(cpu, xen_vector); |
f447d56d BG |
666 | } |
667 | } | |
668 | ||
669 | void xen_send_IPI_allbutself(int vector) | |
670 | { | |
1db01b49 | 671 | xen_send_IPI_mask_allbutself(cpu_online_mask, vector); |
f447d56d BG |
672 | } |
673 | ||
f87e4cac JF |
674 | static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id) |
675 | { | |
f87e4cac | 676 | irq_enter(); |
3b16cf87 | 677 | generic_smp_call_function_interrupt(); |
1b437c8c | 678 | inc_irq_stat(irq_call_count); |
f87e4cac JF |
679 | irq_exit(); |
680 | ||
f87e4cac JF |
681 | return IRQ_HANDLED; |
682 | } | |
683 | ||
3b16cf87 | 684 | static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id) |
f87e4cac | 685 | { |
3b16cf87 JA |
686 | irq_enter(); |
687 | generic_smp_call_function_single_interrupt(); | |
1b437c8c | 688 | inc_irq_stat(irq_call_count); |
3b16cf87 | 689 | irq_exit(); |
f87e4cac | 690 | |
3b16cf87 | 691 | return IRQ_HANDLED; |
f87e4cac | 692 | } |
a9e7062d | 693 | |
1ff2b0c3 LM |
694 | static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id) |
695 | { | |
696 | irq_enter(); | |
697 | irq_work_run(); | |
698 | inc_irq_stat(apic_irq_work_irqs); | |
699 | irq_exit(); | |
700 | ||
701 | return IRQ_HANDLED; | |
702 | } | |
703 | ||
b53cedeb | 704 | static const struct smp_ops xen_smp_ops __initconst = { |
a9e7062d JF |
705 | .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu, |
706 | .smp_prepare_cpus = xen_smp_prepare_cpus, | |
a9e7062d JF |
707 | .smp_cpus_done = xen_smp_cpus_done, |
708 | ||
d68d82af AN |
709 | .cpu_up = xen_cpu_up, |
710 | .cpu_die = xen_cpu_die, | |
711 | .cpu_disable = xen_cpu_disable, | |
712 | .play_dead = xen_play_dead, | |
713 | ||
76fac077 | 714 | .stop_other_cpus = xen_stop_other_cpus, |
a9e7062d JF |
715 | .smp_send_reschedule = xen_smp_send_reschedule, |
716 | ||
717 | .send_call_func_ipi = xen_smp_send_call_function_ipi, | |
718 | .send_call_func_single_ipi = xen_smp_send_call_function_single_ipi, | |
719 | }; | |
720 | ||
721 | void __init xen_smp_init(void) | |
722 | { | |
723 | smp_ops = xen_smp_ops; | |
c7b75947 | 724 | xen_fill_possible_map(); |
a9e7062d | 725 | } |
99bbb3a8 SS |
726 | |
727 | static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus) | |
728 | { | |
729 | native_smp_prepare_cpus(max_cpus); | |
730 | WARN_ON(xen_smp_intr_init(0)); | |
731 | ||
99bbb3a8 | 732 | xen_init_lock_cpu(0); |
99bbb3a8 SS |
733 | } |
734 | ||
148f9bb8 | 735 | static int xen_hvm_cpu_up(unsigned int cpu, struct task_struct *tidle) |
99bbb3a8 SS |
736 | { |
737 | int rc; | |
fc78d343 CA |
738 | /* |
739 | * xen_smp_intr_init() needs to run before native_cpu_up() | |
740 | * so that IPI vectors are set up on the booting CPU before | |
741 | * it is marked online in native_cpu_up(). | |
742 | */ | |
743 | rc = xen_smp_intr_init(cpu); | |
744 | WARN_ON(rc); | |
745 | if (!rc) | |
746 | rc = native_cpu_up(cpu, tidle); | |
1fb3a8b2 KRW |
747 | |
748 | /* | |
749 | * We must initialize the slowpath CPU kicker _after_ the native | |
750 | * path has executed. If we initialized it before none of the | |
751 | * unlocker IPI kicks would reach the booting CPU as the booting | |
752 | * CPU had not set itself 'online' in cpu_online_mask. That mask | |
753 | * is checked when IPIs are sent (on HVM at least). | |
754 | */ | |
755 | xen_init_lock_cpu(cpu); | |
99bbb3a8 SS |
756 | return rc; |
757 | } | |
758 | ||
759 | static void xen_hvm_cpu_die(unsigned int cpu) | |
760 | { | |
b12abaa1 | 761 | xen_cpu_die(cpu); |
99bbb3a8 SS |
762 | native_cpu_die(cpu); |
763 | } | |
764 | ||
765 | void __init xen_hvm_smp_init(void) | |
766 | { | |
3c05c4be SS |
767 | if (!xen_have_vector_callback) |
768 | return; | |
99bbb3a8 SS |
769 | smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus; |
770 | smp_ops.smp_send_reschedule = xen_smp_send_reschedule; | |
771 | smp_ops.cpu_up = xen_hvm_cpu_up; | |
772 | smp_ops.cpu_die = xen_hvm_cpu_die; | |
773 | smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi; | |
774 | smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi; | |
26a79995 | 775 | smp_ops.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu; |
99bbb3a8 | 776 | } |