Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 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. |
| 14 | * |
| 15 | * This does not handle HOTPLUG_CPU yet. |
| 16 | */ |
| 17 | #include <linux/sched.h> |
| 18 | #include <linux/err.h> |
| 19 | #include <linux/smp.h> |
| 20 | |
| 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 | |
| 32 | #include <xen/page.h> |
| 33 | #include <xen/events.h> |
| 34 | |
| 35 | #include "xen-ops.h" |
| 36 | #include "mmu.h" |
| 37 | |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 38 | cpumask_t xen_cpu_initialized_map; |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 39 | |
| 40 | static DEFINE_PER_CPU(int, resched_irq); |
| 41 | static DEFINE_PER_CPU(int, callfunc_irq); |
| 42 | static DEFINE_PER_CPU(int, callfuncsingle_irq); |
Jeremy Fitzhardinge | ee523ca | 2008-03-17 16:37:18 -0700 | [diff] [blame] | 43 | static DEFINE_PER_CPU(int, debug_irq) = -1; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 44 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 45 | static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id); |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 46 | static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 47 | |
| 48 | /* |
| 49 | * Reschedule call back. Nothing to do, |
| 50 | * all the work is done automatically when |
| 51 | * we return from the interrupt. |
| 52 | */ |
| 53 | static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id) |
| 54 | { |
Jeremy Fitzhardinge | 38bb5ab | 2008-05-26 23:31:16 +0100 | [diff] [blame] | 55 | #ifdef CONFIG_X86_32 |
| 56 | __get_cpu_var(irq_stat).irq_resched_count++; |
| 57 | #else |
| 58 | add_pda(irq_resched_count, 1); |
| 59 | #endif |
| 60 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 61 | return IRQ_HANDLED; |
| 62 | } |
| 63 | |
| 64 | static __cpuinit void cpu_bringup_and_idle(void) |
| 65 | { |
| 66 | int cpu = smp_processor_id(); |
| 67 | |
| 68 | cpu_init(); |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 69 | preempt_disable(); |
| 70 | |
Jeremy Fitzhardinge | e2a81ba | 2008-03-17 16:37:17 -0700 | [diff] [blame] | 71 | xen_enable_sysenter(); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 72 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 73 | cpu = smp_processor_id(); |
| 74 | smp_store_cpu_info(cpu); |
| 75 | cpu_data(cpu).x86_max_cores = 1; |
| 76 | set_cpu_sibling_map(cpu); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 77 | |
| 78 | xen_setup_cpu_clockevents(); |
| 79 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 80 | cpu_set(cpu, cpu_online_map); |
| 81 | x86_write_percpu(cpu_state, CPU_ONLINE); |
| 82 | wmb(); |
| 83 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 84 | /* We can take interrupts now: we're officially "up". */ |
| 85 | local_irq_enable(); |
| 86 | |
| 87 | wmb(); /* make sure everything is out */ |
| 88 | cpu_idle(); |
| 89 | } |
| 90 | |
| 91 | static int xen_smp_intr_init(unsigned int cpu) |
| 92 | { |
| 93 | int rc; |
Jeremy Fitzhardinge | ee523ca | 2008-03-17 16:37:18 -0700 | [diff] [blame] | 94 | const char *resched_name, *callfunc_name, *debug_name; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 95 | |
| 96 | resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu); |
| 97 | rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR, |
| 98 | cpu, |
| 99 | xen_reschedule_interrupt, |
| 100 | IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING, |
| 101 | resched_name, |
| 102 | NULL); |
| 103 | if (rc < 0) |
| 104 | goto fail; |
| 105 | per_cpu(resched_irq, cpu) = rc; |
| 106 | |
| 107 | callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu); |
| 108 | rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR, |
| 109 | cpu, |
| 110 | xen_call_function_interrupt, |
| 111 | IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING, |
| 112 | callfunc_name, |
| 113 | NULL); |
| 114 | if (rc < 0) |
| 115 | goto fail; |
| 116 | per_cpu(callfunc_irq, cpu) = rc; |
| 117 | |
Jeremy Fitzhardinge | ee523ca | 2008-03-17 16:37:18 -0700 | [diff] [blame] | 118 | debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu); |
| 119 | rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt, |
| 120 | IRQF_DISABLED | IRQF_PERCPU | IRQF_NOBALANCING, |
| 121 | debug_name, NULL); |
| 122 | if (rc < 0) |
| 123 | goto fail; |
| 124 | per_cpu(debug_irq, cpu) = rc; |
| 125 | |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 126 | callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu); |
| 127 | rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR, |
| 128 | cpu, |
| 129 | xen_call_function_single_interrupt, |
| 130 | IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING, |
| 131 | callfunc_name, |
| 132 | NULL); |
| 133 | if (rc < 0) |
| 134 | goto fail; |
| 135 | per_cpu(callfuncsingle_irq, cpu) = rc; |
| 136 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 137 | return 0; |
| 138 | |
| 139 | fail: |
| 140 | if (per_cpu(resched_irq, cpu) >= 0) |
| 141 | unbind_from_irqhandler(per_cpu(resched_irq, cpu), NULL); |
| 142 | if (per_cpu(callfunc_irq, cpu) >= 0) |
| 143 | unbind_from_irqhandler(per_cpu(callfunc_irq, cpu), NULL); |
Jeremy Fitzhardinge | ee523ca | 2008-03-17 16:37:18 -0700 | [diff] [blame] | 144 | if (per_cpu(debug_irq, cpu) >= 0) |
| 145 | unbind_from_irqhandler(per_cpu(debug_irq, cpu), NULL); |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 146 | if (per_cpu(callfuncsingle_irq, cpu) >= 0) |
| 147 | unbind_from_irqhandler(per_cpu(callfuncsingle_irq, cpu), NULL); |
| 148 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 149 | return rc; |
| 150 | } |
| 151 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 152 | static void __init xen_fill_possible_map(void) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 153 | { |
| 154 | int i, rc; |
| 155 | |
| 156 | for (i = 0; i < NR_CPUS; i++) { |
| 157 | rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL); |
| 158 | if (rc >= 0) |
| 159 | cpu_set(i, cpu_possible_map); |
| 160 | } |
| 161 | } |
| 162 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 163 | static void __init xen_smp_prepare_boot_cpu(void) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 164 | { |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 165 | BUG_ON(smp_processor_id() != 0); |
| 166 | native_smp_prepare_boot_cpu(); |
| 167 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 168 | /* We've switched to the "real" per-cpu gdt, so make sure the |
| 169 | old memory can be recycled */ |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 170 | make_lowmem_page_readwrite(&per_cpu_var(gdt_page)); |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 171 | |
| 172 | xen_setup_vcpu_info_placement(); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 173 | } |
| 174 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 175 | static void __init xen_smp_prepare_cpus(unsigned int max_cpus) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 176 | { |
| 177 | unsigned cpu; |
| 178 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 179 | smp_store_cpu_info(0); |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 180 | cpu_data(0).x86_max_cores = 1; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 181 | set_cpu_sibling_map(0); |
| 182 | |
| 183 | if (xen_smp_intr_init(0)) |
| 184 | BUG(); |
| 185 | |
Glauber Costa | ecaa6c9 | 2008-03-27 14:06:03 -0300 | [diff] [blame] | 186 | xen_cpu_initialized_map = cpumask_of_cpu(0); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 187 | |
| 188 | /* Restrict the possible_map according to max_cpus. */ |
| 189 | while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) { |
Akinobu Mita | 7c04e64 | 2008-04-19 23:55:17 +0900 | [diff] [blame] | 190 | for (cpu = NR_CPUS - 1; !cpu_possible(cpu); cpu--) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 191 | continue; |
| 192 | cpu_clear(cpu, cpu_possible_map); |
| 193 | } |
| 194 | |
| 195 | for_each_possible_cpu (cpu) { |
| 196 | struct task_struct *idle; |
| 197 | |
| 198 | if (cpu == 0) |
| 199 | continue; |
| 200 | |
| 201 | idle = fork_idle(cpu); |
| 202 | if (IS_ERR(idle)) |
| 203 | panic("failed fork for CPU %d", cpu); |
| 204 | |
| 205 | cpu_set(cpu, cpu_present_map); |
| 206 | } |
| 207 | |
| 208 | //init_xenbus_allowed_cpumask(); |
| 209 | } |
| 210 | |
| 211 | static __cpuinit int |
| 212 | cpu_initialize_context(unsigned int cpu, struct task_struct *idle) |
| 213 | { |
| 214 | struct vcpu_guest_context *ctxt; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 215 | struct desc_struct *gdt; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 216 | |
Glauber Costa | ecaa6c9 | 2008-03-27 14:06:03 -0300 | [diff] [blame] | 217 | if (cpu_test_and_set(cpu, xen_cpu_initialized_map)) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 218 | return 0; |
| 219 | |
| 220 | ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL); |
| 221 | if (ctxt == NULL) |
| 222 | return -ENOMEM; |
| 223 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 224 | gdt = get_cpu_gdt_table(cpu); |
| 225 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 226 | ctxt->flags = VGCF_IN_KERNEL; |
| 227 | ctxt->user_regs.ds = __USER_DS; |
| 228 | ctxt->user_regs.es = __USER_DS; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 229 | ctxt->user_regs.ss = __KERNEL_DS; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 230 | #ifdef CONFIG_X86_32 |
| 231 | ctxt->user_regs.fs = __KERNEL_PERCPU; |
| 232 | #endif |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 233 | ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle; |
| 234 | ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */ |
| 235 | |
| 236 | memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt)); |
| 237 | |
| 238 | xen_copy_trap_info(ctxt->trap_ctxt); |
| 239 | |
| 240 | ctxt->ldt_ents = 0; |
| 241 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 242 | BUG_ON((unsigned long)gdt & ~PAGE_MASK); |
| 243 | make_lowmem_page_readonly(gdt); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 244 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 245 | ctxt->gdt_frames[0] = virt_to_mfn(gdt); |
| 246 | ctxt->gdt_ents = GDT_ENTRIES; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 247 | |
| 248 | ctxt->user_regs.cs = __KERNEL_CS; |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 249 | ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 250 | |
| 251 | ctxt->kernel_ss = __KERNEL_DS; |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 252 | ctxt->kernel_sp = idle->thread.sp0; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 253 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 254 | #ifdef CONFIG_X86_32 |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 255 | ctxt->event_callback_cs = __KERNEL_CS; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 256 | ctxt->failsafe_callback_cs = __KERNEL_CS; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 257 | #endif |
| 258 | ctxt->event_callback_eip = (unsigned long)xen_hypervisor_callback; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 259 | ctxt->failsafe_callback_eip = (unsigned long)xen_failsafe_callback; |
| 260 | |
| 261 | per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir); |
| 262 | ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir)); |
| 263 | |
| 264 | if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt)) |
| 265 | BUG(); |
| 266 | |
| 267 | kfree(ctxt); |
| 268 | return 0; |
| 269 | } |
| 270 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 271 | static int __cpuinit xen_cpu_up(unsigned int cpu) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 272 | { |
| 273 | struct task_struct *idle = idle_task(cpu); |
| 274 | int rc; |
| 275 | |
| 276 | #if 0 |
| 277 | rc = cpu_up_check(cpu); |
| 278 | if (rc) |
| 279 | return rc; |
| 280 | #endif |
| 281 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 282 | #ifdef CONFIG_X86_64 |
| 283 | /* Allocate node local memory for AP pdas */ |
| 284 | WARN_ON(cpu == 0); |
| 285 | if (cpu > 0) { |
| 286 | rc = get_local_pda(cpu); |
| 287 | if (rc) |
| 288 | return rc; |
| 289 | } |
| 290 | #endif |
| 291 | |
| 292 | #ifdef CONFIG_X86_32 |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 293 | init_gdt(cpu); |
| 294 | per_cpu(current_task, cpu) = idle; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 295 | irq_ctx_init(cpu); |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 296 | #else |
| 297 | cpu_pda(cpu)->pcurrent = idle; |
| 298 | clear_tsk_thread_flag(idle, TIF_FORK); |
| 299 | #endif |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 300 | xen_setup_timer(cpu); |
| 301 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 302 | per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; |
| 303 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 304 | /* make sure interrupts start blocked */ |
| 305 | per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1; |
| 306 | |
| 307 | rc = cpu_initialize_context(cpu, idle); |
| 308 | if (rc) |
| 309 | return rc; |
| 310 | |
| 311 | if (num_online_cpus() == 1) |
| 312 | alternatives_smp_switch(1); |
| 313 | |
| 314 | rc = xen_smp_intr_init(cpu); |
| 315 | if (rc) |
| 316 | return rc; |
| 317 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 318 | rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL); |
| 319 | BUG_ON(rc); |
| 320 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 321 | while(per_cpu(cpu_state, cpu) != CPU_ONLINE) { |
| 322 | HYPERVISOR_sched_op(SCHEDOP_yield, 0); |
| 323 | barrier(); |
| 324 | } |
| 325 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 326 | return 0; |
| 327 | } |
| 328 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 329 | static void xen_smp_cpus_done(unsigned int max_cpus) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 330 | { |
| 331 | } |
| 332 | |
| 333 | static void stop_self(void *v) |
| 334 | { |
| 335 | int cpu = smp_processor_id(); |
| 336 | |
| 337 | /* make sure we're not pinning something down */ |
| 338 | load_cr3(swapper_pg_dir); |
| 339 | /* should set up a minimal gdt */ |
| 340 | |
| 341 | HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL); |
| 342 | BUG(); |
| 343 | } |
| 344 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 345 | static void xen_smp_send_stop(void) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 346 | { |
Jens Axboe | 8691e5a | 2008-06-06 11:18:06 +0200 | [diff] [blame] | 347 | smp_call_function(stop_self, NULL, 0); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 348 | } |
| 349 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 350 | static void xen_smp_send_reschedule(int cpu) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 351 | { |
| 352 | xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR); |
| 353 | } |
| 354 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 355 | static void xen_send_IPI_mask(cpumask_t mask, enum ipi_vector vector) |
| 356 | { |
| 357 | unsigned cpu; |
| 358 | |
| 359 | cpus_and(mask, mask, cpu_online_map); |
| 360 | |
| 361 | for_each_cpu_mask(cpu, mask) |
| 362 | xen_send_IPI_one(cpu, vector); |
| 363 | } |
| 364 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 365 | static void xen_smp_send_call_function_ipi(cpumask_t mask) |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 366 | { |
| 367 | int cpu; |
| 368 | |
| 369 | xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR); |
| 370 | |
| 371 | /* Make sure other vcpus get a chance to run if they need to. */ |
| 372 | for_each_cpu_mask(cpu, mask) { |
| 373 | if (xen_vcpu_stolen(cpu)) { |
| 374 | HYPERVISOR_sched_op(SCHEDOP_yield, 0); |
| 375 | break; |
| 376 | } |
| 377 | } |
| 378 | } |
| 379 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 380 | static void xen_smp_send_call_function_single_ipi(int cpu) |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 381 | { |
| 382 | xen_send_IPI_mask(cpumask_of_cpu(cpu), XEN_CALL_FUNCTION_SINGLE_VECTOR); |
| 383 | } |
| 384 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 385 | static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id) |
| 386 | { |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 387 | irq_enter(); |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 388 | generic_smp_call_function_interrupt(); |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 389 | #ifdef CONFIG_X86_32 |
Joe Korty | 38e760a | 2007-10-17 18:04:40 +0200 | [diff] [blame] | 390 | __get_cpu_var(irq_stat).irq_call_count++; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 391 | #else |
| 392 | add_pda(irq_call_count, 1); |
| 393 | #endif |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 394 | irq_exit(); |
| 395 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 396 | return IRQ_HANDLED; |
| 397 | } |
| 398 | |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 399 | static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 400 | { |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 401 | irq_enter(); |
| 402 | generic_smp_call_function_single_interrupt(); |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 403 | #ifdef CONFIG_X86_32 |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 404 | __get_cpu_var(irq_stat).irq_call_count++; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 405 | #else |
| 406 | add_pda(irq_call_count, 1); |
| 407 | #endif |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 408 | irq_exit(); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 409 | |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 410 | return IRQ_HANDLED; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 411 | } |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 412 | |
| 413 | static const struct smp_ops xen_smp_ops __initdata = { |
| 414 | .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu, |
| 415 | .smp_prepare_cpus = xen_smp_prepare_cpus, |
| 416 | .cpu_up = xen_cpu_up, |
| 417 | .smp_cpus_done = xen_smp_cpus_done, |
| 418 | |
| 419 | .smp_send_stop = xen_smp_send_stop, |
| 420 | .smp_send_reschedule = xen_smp_send_reschedule, |
| 421 | |
| 422 | .send_call_func_ipi = xen_smp_send_call_function_ipi, |
| 423 | .send_call_func_single_ipi = xen_smp_send_call_function_single_ipi, |
| 424 | }; |
| 425 | |
| 426 | void __init xen_smp_init(void) |
| 427 | { |
| 428 | smp_ops = xen_smp_ops; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame^] | 429 | xen_fill_possible_map(); |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 430 | } |