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Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -07001/*
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.
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070014 */
15#include <linux/sched.h>
16#include <linux/err.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070018#include <linux/smp.h>
Lin Ming1ff2b0c2012-04-21 00:11:05 +080019#include <linux/irq_work.h>
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070020
21#include <asm/paravirt.h>
22#include <asm/desc.h>
23#include <asm/pgtable.h>
24#include <asm/cpu.h>
25
26#include <xen/interface/xen.h>
27#include <xen/interface/vcpu.h>
28
29#include <asm/xen/interface.h>
30#include <asm/xen/hypercall.h>
31
Stefano Stabelliniea5b8f72010-10-26 17:28:33 +010032#include <xen/xen.h>
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070033#include <xen/page.h>
34#include <xen/events.h>
35
Konrad Rzeszutek Wilked467e62011-09-01 09:48:27 -040036#include <xen/hvc-console.h>
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070037#include "xen-ops.h"
38#include "mmu.h"
39
Mike Travisb78936e2008-12-16 17:33:57 -080040cpumask_var_t xen_cpu_initialized_map;
Jens Axboe3b16cf82008-06-26 11:21:54 +020041
Tejun Heoc6e22f92009-10-29 22:34:13 +090042static DEFINE_PER_CPU(int, xen_resched_irq);
43static DEFINE_PER_CPU(int, xen_callfunc_irq);
44static DEFINE_PER_CPU(int, xen_callfuncsingle_irq);
Lin Ming1ff2b0c2012-04-21 00:11:05 +080045static DEFINE_PER_CPU(int, xen_irq_work);
Tejun Heoc6e22f92009-10-29 22:34:13 +090046static DEFINE_PER_CPU(int, xen_debug_irq) = -1;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070047
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070048static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
Jens Axboe3b16cf82008-06-26 11:21:54 +020049static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
Lin Ming1ff2b0c2012-04-21 00:11:05 +080050static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070051
52/*
Peter Zijlstra184748c2011-04-05 17:23:39 +020053 * Reschedule call back.
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070054 */
55static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
56{
Brian Gerst1b437c82009-01-19 00:38:57 +090057 inc_irq_stat(irq_resched_count);
Peter Zijlstra184748c2011-04-05 17:23:39 +020058 scheduler_ipi();
Jeremy Fitzhardinge38bb5ab2008-05-26 23:31:16 +010059
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070060 return IRQ_HANDLED;
61}
62
Daniel Kiperb53cede2011-05-04 20:18:05 +020063static void __cpuinit cpu_bringup(void)
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070064{
Srivatsa S. Bhate8c9e782012-03-22 18:29:24 +053065 int cpu;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070066
67 cpu_init();
Alex Nixond68d82a2008-08-22 11:52:15 +010068 touch_softlockup_watchdog();
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -070069 preempt_disable();
70
Jeremy Fitzhardingee2a81ba2008-03-17 16:37:17 -070071 xen_enable_sysenter();
Jeremy Fitzhardinge6fcac6d2008-07-08 15:07:14 -070072 xen_enable_syscall();
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070073
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -070074 cpu = smp_processor_id();
75 smp_store_cpu_info(cpu);
76 cpu_data(cpu).x86_max_cores = 1;
77 set_cpu_sibling_map(cpu);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070078
79 xen_setup_cpu_clockevents();
80
Konrad Rzeszutek Wilk106b4432012-03-21 13:03:45 -040081 notify_cpu_starting(cpu);
82
Rusty Russelld7d37562009-11-03 14:58:38 +103083 set_cpu_online(cpu, true);
Konrad Rzeszutek Wilk106b4432012-03-21 13:03:45 -040084
Alex Shi2113f462012-01-13 23:53:35 +080085 this_cpu_write(cpu_state, CPU_ONLINE);
Konrad Rzeszutek Wilk106b4432012-03-21 13:03:45 -040086
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -070087 wmb();
88
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070089 /* We can take interrupts now: we're officially "up". */
90 local_irq_enable();
91
92 wmb(); /* make sure everything is out */
Alex Nixond68d82a2008-08-22 11:52:15 +010093}
94
Daniel Kiperb53cede2011-05-04 20:18:05 +020095static void __cpuinit cpu_bringup_and_idle(void)
Alex Nixond68d82a2008-08-22 11:52:15 +010096{
97 cpu_bringup();
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070098 cpu_idle();
99}
100
101static int xen_smp_intr_init(unsigned int cpu)
102{
103 int rc;
Jeremy Fitzhardingeee523ca2008-03-17 16:37:18 -0700104 const char *resched_name, *callfunc_name, *debug_name;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700105
106 resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
107 rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
108 cpu,
109 xen_reschedule_interrupt,
110 IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
111 resched_name,
112 NULL);
113 if (rc < 0)
114 goto fail;
Tejun Heoc6e22f92009-10-29 22:34:13 +0900115 per_cpu(xen_resched_irq, cpu) = rc;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700116
117 callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
118 rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
119 cpu,
120 xen_call_function_interrupt,
121 IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
122 callfunc_name,
123 NULL);
124 if (rc < 0)
125 goto fail;
Tejun Heoc6e22f92009-10-29 22:34:13 +0900126 per_cpu(xen_callfunc_irq, cpu) = rc;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700127
Jeremy Fitzhardingeee523ca2008-03-17 16:37:18 -0700128 debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
129 rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
130 IRQF_DISABLED | IRQF_PERCPU | IRQF_NOBALANCING,
131 debug_name, NULL);
132 if (rc < 0)
133 goto fail;
Tejun Heoc6e22f92009-10-29 22:34:13 +0900134 per_cpu(xen_debug_irq, cpu) = rc;
Jeremy Fitzhardingeee523ca2008-03-17 16:37:18 -0700135
Jens Axboe3b16cf82008-06-26 11:21:54 +0200136 callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
137 rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
138 cpu,
139 xen_call_function_single_interrupt,
140 IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
141 callfunc_name,
142 NULL);
143 if (rc < 0)
144 goto fail;
Tejun Heoc6e22f92009-10-29 22:34:13 +0900145 per_cpu(xen_callfuncsingle_irq, cpu) = rc;
Jens Axboe3b16cf82008-06-26 11:21:54 +0200146
Lin Ming1ff2b0c2012-04-21 00:11:05 +0800147 callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
148 rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
149 cpu,
150 xen_irq_work_interrupt,
151 IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
152 callfunc_name,
153 NULL);
154 if (rc < 0)
155 goto fail;
156 per_cpu(xen_irq_work, cpu) = rc;
157
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700158 return 0;
159
160 fail:
Tejun Heoc6e22f92009-10-29 22:34:13 +0900161 if (per_cpu(xen_resched_irq, cpu) >= 0)
162 unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
163 if (per_cpu(xen_callfunc_irq, cpu) >= 0)
164 unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
165 if (per_cpu(xen_debug_irq, cpu) >= 0)
166 unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
167 if (per_cpu(xen_callfuncsingle_irq, cpu) >= 0)
168 unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu),
169 NULL);
Lin Ming1ff2b0c2012-04-21 00:11:05 +0800170 if (per_cpu(xen_irq_work, cpu) >= 0)
171 unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
Jens Axboe3b16cf82008-06-26 11:21:54 +0200172
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700173 return rc;
174}
175
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700176static void __init xen_fill_possible_map(void)
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700177{
178 int i, rc;
179
Stefano Stabelliniea5b8f72010-10-26 17:28:33 +0100180 if (xen_initial_domain())
181 return;
182
Mike Travise7986732008-12-16 17:33:52 -0800183 for (i = 0; i < nr_cpu_ids; i++) {
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700184 rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
Jeremy Fitzhardinge4560a292008-07-08 15:06:56 -0700185 if (rc >= 0) {
186 num_processors++;
Rusty Russell4f062892009-03-13 14:49:54 +1030187 set_cpu_possible(i, true);
Jeremy Fitzhardinge4560a292008-07-08 15:06:56 -0700188 }
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700189 }
190}
191
Stefano Stabelliniea5b8f72010-10-26 17:28:33 +0100192static void __init xen_filter_cpu_maps(void)
193{
194 int i, rc;
Konrad Rzeszutek Wilkcf405ae2012-04-26 13:50:03 -0400195 unsigned int subtract = 0;
Stefano Stabelliniea5b8f72010-10-26 17:28:33 +0100196
197 if (!xen_initial_domain())
198 return;
199
Stefano Stabellini801fd142010-09-23 12:06:25 +0100200 num_processors = 0;
201 disabled_cpus = 0;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700202 for (i = 0; i < nr_cpu_ids; i++) {
203 rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
204 if (rc >= 0) {
205 num_processors++;
206 set_cpu_possible(i, true);
Stefano Stabellini801fd142010-09-23 12:06:25 +0100207 } else {
208 set_cpu_possible(i, false);
209 set_cpu_present(i, false);
Konrad Rzeszutek Wilkcf405ae2012-04-26 13:50:03 -0400210 subtract++;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700211 }
212 }
Konrad Rzeszutek Wilkcf405ae2012-04-26 13:50:03 -0400213#ifdef CONFIG_HOTPLUG_CPU
214 /* This is akin to using 'nr_cpus' on the Linux command line.
215 * Which is OK as when we use 'dom0_max_vcpus=X' we can only
216 * have up to X, while nr_cpu_ids is greater than X. This
217 * normally is not a problem, except when CPU hotplugging
218 * is involved and then there might be more than X CPUs
219 * in the guest - which will not work as there is no
220 * hypercall to expand the max number of VCPUs an already
221 * running guest has. So cap it up to X. */
222 if (subtract)
223 nr_cpu_ids = nr_cpu_ids - subtract;
224#endif
225
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700226}
227
Jeremy Fitzhardingea9e70622008-07-08 15:06:41 -0700228static void __init xen_smp_prepare_boot_cpu(void)
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700229{
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700230 BUG_ON(smp_processor_id() != 0);
231 native_smp_prepare_boot_cpu();
232
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700233 /* We've switched to the "real" per-cpu gdt, so make sure the
234 old memory can be recycled */
Jeremy Fitzhardinge38341432009-02-02 13:55:31 -0800235 make_lowmem_page_readwrite(xen_initial_gdt);
Jeremy Fitzhardinge60223a32007-07-17 18:37:07 -0700236
Stefano Stabelliniea5b8f72010-10-26 17:28:33 +0100237 xen_filter_cpu_maps();
Jeremy Fitzhardinge60223a32007-07-17 18:37:07 -0700238 xen_setup_vcpu_info_placement();
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700239}
240
Jeremy Fitzhardingea9e70622008-07-08 15:06:41 -0700241static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700242{
243 unsigned cpu;
Andrew Jones900cba82009-12-18 10:31:31 +0100244 unsigned int i;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700245
Konrad Rzeszutek Wilked467e62011-09-01 09:48:27 -0400246 if (skip_ioapic_setup) {
247 char *m = (max_cpus == 0) ?
248 "The nosmp parameter is incompatible with Xen; " \
249 "use Xen dom0_max_vcpus=1 parameter" :
250 "The noapic parameter is incompatible with Xen";
251
252 xen_raw_printk(m);
253 panic(m);
254 }
Jeremy Fitzhardinge2d9e1e22008-07-07 12:07:53 -0700255 xen_init_lock_cpu(0);
256
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700257 smp_store_cpu_info(0);
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700258 cpu_data(0).x86_max_cores = 1;
Andrew Jones900cba82009-12-18 10:31:31 +0100259
260 for_each_possible_cpu(i) {
261 zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
262 zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
263 zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
264 }
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700265 set_cpu_sibling_map(0);
266
267 if (xen_smp_intr_init(0))
268 BUG();
269
Mike Travisb78936e2008-12-16 17:33:57 -0800270 if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
271 panic("could not allocate xen_cpu_initialized_map\n");
272
273 cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700274
275 /* Restrict the possible_map according to max_cpus. */
276 while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
Mike Travise7986732008-12-16 17:33:52 -0800277 for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700278 continue;
Rusty Russell4f062892009-03-13 14:49:54 +1030279 set_cpu_possible(cpu, false);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700280 }
281
Thomas Gleixner7eb43a62012-04-20 13:05:48 +0000282 for_each_possible_cpu(cpu)
Rusty Russell4f062892009-03-13 14:49:54 +1030283 set_cpu_present(cpu, true);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700284}
285
Daniel Kiperb53cede2011-05-04 20:18:05 +0200286static int __cpuinit
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700287cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
288{
289 struct vcpu_guest_context *ctxt;
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700290 struct desc_struct *gdt;
Jeremy Fitzhardinge9976b392009-02-27 09:19:26 -0800291 unsigned long gdt_mfn;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700292
Mike Travisb78936e2008-12-16 17:33:57 -0800293 if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700294 return 0;
295
296 ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
297 if (ctxt == NULL)
298 return -ENOMEM;
299
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700300 gdt = get_cpu_gdt_table(cpu);
301
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700302 ctxt->flags = VGCF_IN_KERNEL;
303 ctxt->user_regs.ds = __USER_DS;
304 ctxt->user_regs.es = __USER_DS;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700305 ctxt->user_regs.ss = __KERNEL_DS;
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700306#ifdef CONFIG_X86_32
307 ctxt->user_regs.fs = __KERNEL_PERCPU;
Jeremy Fitzhardinge577eebe2009-08-27 12:46:35 -0700308 ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
Jeremy Fitzhardinge795f99b2009-01-30 17:47:54 +0900309#else
310 ctxt->gs_base_kernel = per_cpu_offset(cpu);
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700311#endif
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700312 ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
313 ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
314
315 memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
316
317 xen_copy_trap_info(ctxt->trap_ctxt);
318
319 ctxt->ldt_ents = 0;
320
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700321 BUG_ON((unsigned long)gdt & ~PAGE_MASK);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700322
Jeremy Fitzhardinge9976b392009-02-27 09:19:26 -0800323 gdt_mfn = arbitrary_virt_to_mfn(gdt);
324 make_lowmem_page_readonly(gdt);
325 make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
326
327 ctxt->gdt_frames[0] = gdt_mfn;
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700328 ctxt->gdt_ents = GDT_ENTRIES;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700329
330 ctxt->user_regs.cs = __KERNEL_CS;
H. Peter Anvinfaca6222008-01-30 13:31:02 +0100331 ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700332
333 ctxt->kernel_ss = __KERNEL_DS;
H. Peter Anvinfaca6222008-01-30 13:31:02 +0100334 ctxt->kernel_sp = idle->thread.sp0;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700335
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700336#ifdef CONFIG_X86_32
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700337 ctxt->event_callback_cs = __KERNEL_CS;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700338 ctxt->failsafe_callback_cs = __KERNEL_CS;
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700339#endif
340 ctxt->event_callback_eip = (unsigned long)xen_hypervisor_callback;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700341 ctxt->failsafe_callback_eip = (unsigned long)xen_failsafe_callback;
342
343 per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
344 ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));
345
346 if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
347 BUG();
348
349 kfree(ctxt);
350 return 0;
351}
352
Thomas Gleixner7eb43a62012-04-20 13:05:48 +0000353static int __cpuinit xen_cpu_up(unsigned int cpu, struct task_struct *idle)
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700354{
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700355 int rc;
356
Brian Gerstc6f5e0a2009-01-19 00:38:58 +0900357 per_cpu(current_task, cpu) = idle;
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700358#ifdef CONFIG_X86_32
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700359 irq_ctx_init(cpu);
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700360#else
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700361 clear_tsk_thread_flag(idle, TIF_FORK);
Jeremy Fitzhardinge38341432009-02-02 13:55:31 -0800362 per_cpu(kernel_stack, cpu) =
363 (unsigned long)task_stack_page(idle) -
364 KERNEL_STACK_OFFSET + THREAD_SIZE;
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700365#endif
Ian Campbell02889672009-11-24 09:32:48 -0800366 xen_setup_runstate_info(cpu);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700367 xen_setup_timer(cpu);
Jeremy Fitzhardinge2d9e1e22008-07-07 12:07:53 -0700368 xen_init_lock_cpu(cpu);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700369
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700370 per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
371
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700372 /* make sure interrupts start blocked */
373 per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
374
375 rc = cpu_initialize_context(cpu, idle);
376 if (rc)
377 return rc;
378
379 if (num_online_cpus() == 1)
380 alternatives_smp_switch(1);
381
382 rc = xen_smp_intr_init(cpu);
383 if (rc)
384 return rc;
385
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700386 rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL);
387 BUG_ON(rc);
388
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700389 while(per_cpu(cpu_state, cpu) != CPU_ONLINE) {
Hannes Eder1207cf8e2009-03-05 20:13:57 +0100390 HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700391 barrier();
392 }
393
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700394 return 0;
395}
396
Jeremy Fitzhardingea9e70622008-07-08 15:06:41 -0700397static void xen_smp_cpus_done(unsigned int max_cpus)
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700398{
399}
400
Alex Nixon27371462008-09-08 13:43:33 +0100401#ifdef CONFIG_HOTPLUG_CPU
Alex Nixon26fd1052008-09-08 13:43:34 +0100402static int xen_cpu_disable(void)
Alex Nixond68d82a2008-08-22 11:52:15 +0100403{
404 unsigned int cpu = smp_processor_id();
405 if (cpu == 0)
406 return -EBUSY;
407
408 cpu_disable_common();
409
410 load_cr3(swapper_pg_dir);
411 return 0;
412}
413
Alex Nixon26fd1052008-09-08 13:43:34 +0100414static void xen_cpu_die(unsigned int cpu)
Alex Nixond68d82a2008-08-22 11:52:15 +0100415{
416 while (HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) {
417 current->state = TASK_UNINTERRUPTIBLE;
418 schedule_timeout(HZ/10);
419 }
Tejun Heoc6e22f92009-10-29 22:34:13 +0900420 unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
421 unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
422 unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
423 unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
Konrad Rzeszutek Wilk2f1bd672012-05-21 09:19:38 -0400424 unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
Alex Nixond68d82a2008-08-22 11:52:15 +0100425 xen_uninit_lock_cpu(cpu);
426 xen_teardown_timer(cpu);
427
428 if (num_online_cpus() == 1)
429 alternatives_smp_switch(0);
430}
431
Robert P. J. Day71709242009-12-28 11:50:29 -0500432static void __cpuinit xen_play_dead(void) /* used only with HOTPLUG_CPU */
Alex Nixond68d82a2008-08-22 11:52:15 +0100433{
434 play_dead_common();
435 HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL);
436 cpu_bringup();
Konrad Rzeszutek Wilk41bd9562012-02-01 15:56:54 -0500437 /*
438 * Balance out the preempt calls - as we are running in cpu_idle
439 * loop which has been called at bootup from cpu_bringup_and_idle.
440 * The cpucpu_bringup_and_idle called cpu_bringup which made a
441 * preempt_disable() So this preempt_enable will balance it out.
442 */
443 preempt_enable();
Alex Nixond68d82a2008-08-22 11:52:15 +0100444}
445
Alex Nixon27371462008-09-08 13:43:33 +0100446#else /* !CONFIG_HOTPLUG_CPU */
Alex Nixon26fd1052008-09-08 13:43:34 +0100447static int xen_cpu_disable(void)
Alex Nixon27371462008-09-08 13:43:33 +0100448{
449 return -ENOSYS;
450}
451
Alex Nixon26fd1052008-09-08 13:43:34 +0100452static void xen_cpu_die(unsigned int cpu)
Alex Nixon27371462008-09-08 13:43:33 +0100453{
454 BUG();
455}
456
Alex Nixon26fd1052008-09-08 13:43:34 +0100457static void xen_play_dead(void)
Alex Nixon27371462008-09-08 13:43:33 +0100458{
459 BUG();
460}
461
462#endif
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700463static void stop_self(void *v)
464{
465 int cpu = smp_processor_id();
466
467 /* make sure we're not pinning something down */
468 load_cr3(swapper_pg_dir);
469 /* should set up a minimal gdt */
470
Ian Campbell086748e2010-08-03 14:55:14 -0700471 set_cpu_online(cpu, false);
472
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700473 HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL);
474 BUG();
475}
476
Alok Kataria76fac072010-10-11 14:37:08 -0700477static void xen_stop_other_cpus(int wait)
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700478{
Alok Kataria76fac072010-10-11 14:37:08 -0700479 smp_call_function(stop_self, NULL, wait);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700480}
481
Jeremy Fitzhardingea9e70622008-07-08 15:06:41 -0700482static void xen_smp_send_reschedule(int cpu)
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700483{
484 xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
485}
486
Ben Guthrof447d562012-04-21 00:11:04 +0800487static void __xen_send_IPI_mask(const struct cpumask *mask,
488 int vector)
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700489{
490 unsigned cpu;
491
Mike Travisbcda0162008-12-16 17:33:59 -0800492 for_each_cpu_and(cpu, mask, cpu_online_mask)
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700493 xen_send_IPI_one(cpu, vector);
494}
495
Mike Travisbcda0162008-12-16 17:33:59 -0800496static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
Jens Axboe3b16cf82008-06-26 11:21:54 +0200497{
498 int cpu;
499
Ben Guthrof447d562012-04-21 00:11:04 +0800500 __xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
Jens Axboe3b16cf82008-06-26 11:21:54 +0200501
502 /* Make sure other vcpus get a chance to run if they need to. */
Mike Travisbcda0162008-12-16 17:33:59 -0800503 for_each_cpu(cpu, mask) {
Jens Axboe3b16cf82008-06-26 11:21:54 +0200504 if (xen_vcpu_stolen(cpu)) {
Hannes Eder1207cf8e2009-03-05 20:13:57 +0100505 HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
Jens Axboe3b16cf82008-06-26 11:21:54 +0200506 break;
507 }
508 }
509}
510
Jeremy Fitzhardingea9e70622008-07-08 15:06:41 -0700511static void xen_smp_send_call_function_single_ipi(int cpu)
Jens Axboe3b16cf82008-06-26 11:21:54 +0200512{
Ben Guthrof447d562012-04-21 00:11:04 +0800513 __xen_send_IPI_mask(cpumask_of(cpu),
Mike Travise7986732008-12-16 17:33:52 -0800514 XEN_CALL_FUNCTION_SINGLE_VECTOR);
Jens Axboe3b16cf82008-06-26 11:21:54 +0200515}
516
Ben Guthrof447d562012-04-21 00:11:04 +0800517static inline int xen_map_vector(int vector)
518{
519 int xen_vector;
520
521 switch (vector) {
522 case RESCHEDULE_VECTOR:
523 xen_vector = XEN_RESCHEDULE_VECTOR;
524 break;
525 case CALL_FUNCTION_VECTOR:
526 xen_vector = XEN_CALL_FUNCTION_VECTOR;
527 break;
528 case CALL_FUNCTION_SINGLE_VECTOR:
529 xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
530 break;
Lin Ming1ff2b0c2012-04-21 00:11:05 +0800531 case IRQ_WORK_VECTOR:
532 xen_vector = XEN_IRQ_WORK_VECTOR;
533 break;
Ben Guthrof447d562012-04-21 00:11:04 +0800534 default:
535 xen_vector = -1;
536 printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
537 vector);
538 }
539
540 return xen_vector;
541}
542
543void xen_send_IPI_mask(const struct cpumask *mask,
544 int vector)
545{
546 int xen_vector = xen_map_vector(vector);
547
548 if (xen_vector >= 0)
549 __xen_send_IPI_mask(mask, xen_vector);
550}
551
552void xen_send_IPI_all(int vector)
553{
554 int xen_vector = xen_map_vector(vector);
555
556 if (xen_vector >= 0)
557 __xen_send_IPI_mask(cpu_online_mask, xen_vector);
558}
559
560void xen_send_IPI_self(int vector)
561{
562 int xen_vector = xen_map_vector(vector);
563
564 if (xen_vector >= 0)
565 xen_send_IPI_one(smp_processor_id(), xen_vector);
566}
567
568void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
569 int vector)
570{
571 unsigned cpu;
572 unsigned int this_cpu = smp_processor_id();
573
574 if (!(num_online_cpus() > 1))
575 return;
576
577 for_each_cpu_and(cpu, mask, cpu_online_mask) {
578 if (this_cpu == cpu)
579 continue;
580
581 xen_smp_send_call_function_single_ipi(cpu);
582 }
583}
584
585void xen_send_IPI_allbutself(int vector)
586{
587 int xen_vector = xen_map_vector(vector);
588
589 if (xen_vector >= 0)
590 xen_send_IPI_mask_allbutself(cpu_online_mask, xen_vector);
591}
592
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700593static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
594{
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700595 irq_enter();
Jens Axboe3b16cf82008-06-26 11:21:54 +0200596 generic_smp_call_function_interrupt();
Brian Gerst1b437c82009-01-19 00:38:57 +0900597 inc_irq_stat(irq_call_count);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700598 irq_exit();
599
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700600 return IRQ_HANDLED;
601}
602
Jens Axboe3b16cf82008-06-26 11:21:54 +0200603static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700604{
Jens Axboe3b16cf82008-06-26 11:21:54 +0200605 irq_enter();
606 generic_smp_call_function_single_interrupt();
Brian Gerst1b437c82009-01-19 00:38:57 +0900607 inc_irq_stat(irq_call_count);
Jens Axboe3b16cf82008-06-26 11:21:54 +0200608 irq_exit();
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700609
Jens Axboe3b16cf82008-06-26 11:21:54 +0200610 return IRQ_HANDLED;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700611}
Jeremy Fitzhardingea9e70622008-07-08 15:06:41 -0700612
Lin Ming1ff2b0c2012-04-21 00:11:05 +0800613static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
614{
615 irq_enter();
616 irq_work_run();
617 inc_irq_stat(apic_irq_work_irqs);
618 irq_exit();
619
620 return IRQ_HANDLED;
621}
622
Daniel Kiperb53cede2011-05-04 20:18:05 +0200623static const struct smp_ops xen_smp_ops __initconst = {
Jeremy Fitzhardingea9e70622008-07-08 15:06:41 -0700624 .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
625 .smp_prepare_cpus = xen_smp_prepare_cpus,
Jeremy Fitzhardingea9e70622008-07-08 15:06:41 -0700626 .smp_cpus_done = xen_smp_cpus_done,
627
Alex Nixond68d82a2008-08-22 11:52:15 +0100628 .cpu_up = xen_cpu_up,
629 .cpu_die = xen_cpu_die,
630 .cpu_disable = xen_cpu_disable,
631 .play_dead = xen_play_dead,
632
Alok Kataria76fac072010-10-11 14:37:08 -0700633 .stop_other_cpus = xen_stop_other_cpus,
Jeremy Fitzhardingea9e70622008-07-08 15:06:41 -0700634 .smp_send_reschedule = xen_smp_send_reschedule,
635
636 .send_call_func_ipi = xen_smp_send_call_function_ipi,
637 .send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
638};
639
640void __init xen_smp_init(void)
641{
642 smp_ops = xen_smp_ops;
Jeremy Fitzhardingec7b75942008-07-08 15:06:43 -0700643 xen_fill_possible_map();
Jeremy Fitzhardinge2d9e1e22008-07-07 12:07:53 -0700644 xen_init_spinlocks();
Jeremy Fitzhardingea9e70622008-07-08 15:06:41 -0700645}
Stefano Stabellini99bbb3a2010-12-02 17:55:10 +0000646
647static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
648{
649 native_smp_prepare_cpus(max_cpus);
650 WARN_ON(xen_smp_intr_init(0));
651
Stefano Stabellini99bbb3a2010-12-02 17:55:10 +0000652 xen_init_lock_cpu(0);
Stefano Stabellini99bbb3a2010-12-02 17:55:10 +0000653}
654
Thomas Gleixner5cdaf182012-04-20 13:05:47 +0000655static int __cpuinit xen_hvm_cpu_up(unsigned int cpu, struct task_struct *tidle)
Stefano Stabellini99bbb3a2010-12-02 17:55:10 +0000656{
657 int rc;
Thomas Gleixner5cdaf182012-04-20 13:05:47 +0000658 rc = native_cpu_up(cpu, tidle);
Stefano Stabellini99bbb3a2010-12-02 17:55:10 +0000659 WARN_ON (xen_smp_intr_init(cpu));
660 return rc;
661}
662
663static void xen_hvm_cpu_die(unsigned int cpu)
664{
665 unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
666 unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
667 unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
668 unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
Lin Ming1ff2b0c2012-04-21 00:11:05 +0800669 unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
Stefano Stabellini99bbb3a2010-12-02 17:55:10 +0000670 native_cpu_die(cpu);
671}
672
673void __init xen_hvm_smp_init(void)
674{
Stefano Stabellini3c05c4b2011-08-17 15:15:00 +0200675 if (!xen_have_vector_callback)
676 return;
Stefano Stabellini99bbb3a2010-12-02 17:55:10 +0000677 smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
678 smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
679 smp_ops.cpu_up = xen_hvm_cpu_up;
680 smp_ops.cpu_die = xen_hvm_cpu_die;
681 smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
682 smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
683}