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. |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 14 | */ |
| 15 | #include <linux/sched.h> |
| 16 | #include <linux/err.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 17 | #include <linux/slab.h> |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 18 | #include <linux/smp.h> |
Lin Ming | 1ff2b0c | 2012-04-21 00:11:05 +0800 | [diff] [blame] | 19 | #include <linux/irq_work.h> |
Konrad Rzeszutek Wilk | 466318a | 2013-06-03 10:33:55 -0400 | [diff] [blame] | 20 | #include <linux/tick.h> |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 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 | |
Stefano Stabellini | ea5b8f7 | 2010-10-26 17:28:33 +0100 | [diff] [blame] | 33 | #include <xen/xen.h> |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 34 | #include <xen/page.h> |
| 35 | #include <xen/events.h> |
| 36 | |
Konrad Rzeszutek Wilk | ed467e6 | 2011-09-01 09:48:27 -0400 | [diff] [blame] | 37 | #include <xen/hvc-console.h> |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 38 | #include "xen-ops.h" |
| 39 | #include "mmu.h" |
| 40 | |
Mike Travis | b78936e | 2008-12-16 17:33:57 -0800 | [diff] [blame] | 41 | cpumask_var_t xen_cpu_initialized_map; |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 42 | |
Konrad Rzeszutek Wilk | 9547689 | 2013-06-04 16:37:44 -0400 | [diff] [blame] | 43 | struct xen_common_irq { |
| 44 | int irq; |
| 45 | char *name; |
| 46 | }; |
Konrad Rzeszutek Wilk | ee336e1 | 2013-06-04 16:42:29 -0400 | [diff] [blame] | 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 }; |
Konrad Rzeszutek Wilk | 9547689 | 2013-06-04 16:37:44 -0400 | [diff] [blame] | 51 | static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 }; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 52 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 53 | static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id); |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 54 | static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id); |
Lin Ming | 1ff2b0c | 2012-04-21 00:11:05 +0800 | [diff] [blame] | 55 | static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 56 | |
| 57 | /* |
Peter Zijlstra | 184748c | 2011-04-05 17:23:39 +0200 | [diff] [blame] | 58 | * Reschedule call back. |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 59 | */ |
| 60 | static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id) |
| 61 | { |
Brian Gerst | 1b437c8 | 2009-01-19 00:38:57 +0900 | [diff] [blame] | 62 | inc_irq_stat(irq_resched_count); |
Peter Zijlstra | 184748c | 2011-04-05 17:23:39 +0200 | [diff] [blame] | 63 | scheduler_ipi(); |
Jeremy Fitzhardinge | 38bb5ab | 2008-05-26 23:31:16 +0100 | [diff] [blame] | 64 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 65 | return IRQ_HANDLED; |
| 66 | } |
| 67 | |
Paul Gortmaker | 148f9bb | 2013-06-18 18:23:59 -0400 | [diff] [blame] | 68 | static void cpu_bringup(void) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 69 | { |
Srivatsa S. Bhat | e8c9e78 | 2012-03-22 18:29:24 +0530 | [diff] [blame] | 70 | int cpu; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 71 | |
| 72 | cpu_init(); |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 73 | touch_softlockup_watchdog(); |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 74 | preempt_disable(); |
| 75 | |
Jeremy Fitzhardinge | e2a81ba | 2008-03-17 16:37:17 -0700 | [diff] [blame] | 76 | xen_enable_sysenter(); |
Jeremy Fitzhardinge | 6fcac6d | 2008-07-08 15:07:14 -0700 | [diff] [blame] | 77 | xen_enable_syscall(); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 78 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 79 | cpu = smp_processor_id(); |
| 80 | smp_store_cpu_info(cpu); |
| 81 | cpu_data(cpu).x86_max_cores = 1; |
| 82 | set_cpu_sibling_map(cpu); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 83 | |
| 84 | xen_setup_cpu_clockevents(); |
| 85 | |
Konrad Rzeszutek Wilk | 106b443 | 2012-03-21 13:03:45 -0400 | [diff] [blame] | 86 | notify_cpu_starting(cpu); |
| 87 | |
Rusty Russell | d7d3756 | 2009-11-03 14:58:38 +1030 | [diff] [blame] | 88 | set_cpu_online(cpu, true); |
Konrad Rzeszutek Wilk | 106b443 | 2012-03-21 13:03:45 -0400 | [diff] [blame] | 89 | |
Alex Shi | 2113f46 | 2012-01-13 23:53:35 +0800 | [diff] [blame] | 90 | this_cpu_write(cpu_state, CPU_ONLINE); |
Konrad Rzeszutek Wilk | 106b443 | 2012-03-21 13:03:45 -0400 | [diff] [blame] | 91 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 92 | wmb(); |
| 93 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 94 | /* We can take interrupts now: we're officially "up". */ |
| 95 | local_irq_enable(); |
| 96 | |
| 97 | wmb(); /* make sure everything is out */ |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 98 | } |
| 99 | |
Paul Gortmaker | 148f9bb | 2013-06-18 18:23:59 -0400 | [diff] [blame] | 100 | static void cpu_bringup_and_idle(void) |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 101 | { |
| 102 | cpu_bringup(); |
Thomas Gleixner | 7d1a941 | 2013-03-21 22:50:03 +0100 | [diff] [blame] | 103 | cpu_startup_entry(CPUHP_ONLINE); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 104 | } |
| 105 | |
Konrad Rzeszutek Wilk | 53b94fd | 2013-06-04 16:31:34 -0400 | [diff] [blame] | 106 | static void xen_smp_intr_free(unsigned int cpu) |
| 107 | { |
Konrad Rzeszutek Wilk | ee336e1 | 2013-06-04 16:42:29 -0400 | [diff] [blame] | 108 | if (per_cpu(xen_resched_irq, cpu).irq >= 0) { |
Konrad Rzeszutek Wilk | 9547689 | 2013-06-04 16:37:44 -0400 | [diff] [blame] | 109 | unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu).irq, NULL); |
Konrad Rzeszutek Wilk | ee336e1 | 2013-06-04 16:42:29 -0400 | [diff] [blame] | 110 | per_cpu(xen_resched_irq, cpu).irq = -1; |
Konrad Rzeszutek Wilk | b85fffe | 2013-06-04 16:47:17 -0400 | [diff] [blame] | 111 | kfree(per_cpu(xen_resched_irq, cpu).name); |
| 112 | per_cpu(xen_resched_irq, cpu).name = NULL; |
Konrad Rzeszutek Wilk | ee336e1 | 2013-06-04 16:42:29 -0400 | [diff] [blame] | 113 | } |
| 114 | if (per_cpu(xen_callfunc_irq, cpu).irq >= 0) { |
Konrad Rzeszutek Wilk | 9547689 | 2013-06-04 16:37:44 -0400 | [diff] [blame] | 115 | unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu).irq, NULL); |
Konrad Rzeszutek Wilk | ee336e1 | 2013-06-04 16:42:29 -0400 | [diff] [blame] | 116 | per_cpu(xen_callfunc_irq, cpu).irq = -1; |
Konrad Rzeszutek Wilk | b85fffe | 2013-06-04 16:47:17 -0400 | [diff] [blame] | 117 | kfree(per_cpu(xen_callfunc_irq, cpu).name); |
| 118 | per_cpu(xen_callfunc_irq, cpu).name = NULL; |
Konrad Rzeszutek Wilk | ee336e1 | 2013-06-04 16:42:29 -0400 | [diff] [blame] | 119 | } |
| 120 | if (per_cpu(xen_debug_irq, cpu).irq >= 0) { |
Konrad Rzeszutek Wilk | 9547689 | 2013-06-04 16:37:44 -0400 | [diff] [blame] | 121 | unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu).irq, NULL); |
Konrad Rzeszutek Wilk | ee336e1 | 2013-06-04 16:42:29 -0400 | [diff] [blame] | 122 | per_cpu(xen_debug_irq, cpu).irq = -1; |
Konrad Rzeszutek Wilk | b85fffe | 2013-06-04 16:47:17 -0400 | [diff] [blame] | 123 | kfree(per_cpu(xen_debug_irq, cpu).name); |
| 124 | per_cpu(xen_debug_irq, cpu).name = NULL; |
Konrad Rzeszutek Wilk | ee336e1 | 2013-06-04 16:42:29 -0400 | [diff] [blame] | 125 | } |
| 126 | if (per_cpu(xen_callfuncsingle_irq, cpu).irq >= 0) { |
Konrad Rzeszutek Wilk | 9547689 | 2013-06-04 16:37:44 -0400 | [diff] [blame] | 127 | unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu).irq, |
Konrad Rzeszutek Wilk | 53b94fd | 2013-06-04 16:31:34 -0400 | [diff] [blame] | 128 | NULL); |
Konrad Rzeszutek Wilk | ee336e1 | 2013-06-04 16:42:29 -0400 | [diff] [blame] | 129 | per_cpu(xen_callfuncsingle_irq, cpu).irq = -1; |
Konrad Rzeszutek Wilk | b85fffe | 2013-06-04 16:47:17 -0400 | [diff] [blame] | 130 | kfree(per_cpu(xen_callfuncsingle_irq, cpu).name); |
| 131 | per_cpu(xen_callfuncsingle_irq, cpu).name = NULL; |
Konrad Rzeszutek Wilk | ee336e1 | 2013-06-04 16:42:29 -0400 | [diff] [blame] | 132 | } |
Konrad Rzeszutek Wilk | 53b94fd | 2013-06-04 16:31:34 -0400 | [diff] [blame] | 133 | if (xen_hvm_domain()) |
| 134 | return; |
| 135 | |
Konrad Rzeszutek Wilk | ee336e1 | 2013-06-04 16:42:29 -0400 | [diff] [blame] | 136 | if (per_cpu(xen_irq_work, cpu).irq >= 0) { |
Konrad Rzeszutek Wilk | 9547689 | 2013-06-04 16:37:44 -0400 | [diff] [blame] | 137 | unbind_from_irqhandler(per_cpu(xen_irq_work, cpu).irq, NULL); |
Konrad Rzeszutek Wilk | ee336e1 | 2013-06-04 16:42:29 -0400 | [diff] [blame] | 138 | per_cpu(xen_irq_work, cpu).irq = -1; |
Konrad Rzeszutek Wilk | b85fffe | 2013-06-04 16:47:17 -0400 | [diff] [blame] | 139 | kfree(per_cpu(xen_irq_work, cpu).name); |
| 140 | per_cpu(xen_irq_work, cpu).name = NULL; |
Konrad Rzeszutek Wilk | ee336e1 | 2013-06-04 16:42:29 -0400 | [diff] [blame] | 141 | } |
Konrad Rzeszutek Wilk | 53b94fd | 2013-06-04 16:31:34 -0400 | [diff] [blame] | 142 | }; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 143 | static int xen_smp_intr_init(unsigned int cpu) |
| 144 | { |
| 145 | int rc; |
Konrad Rzeszutek Wilk | b85fffe | 2013-06-04 16:47:17 -0400 | [diff] [blame] | 146 | char *resched_name, *callfunc_name, *debug_name; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 147 | |
| 148 | resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu); |
| 149 | rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR, |
| 150 | cpu, |
| 151 | xen_reschedule_interrupt, |
| 152 | IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING, |
| 153 | resched_name, |
| 154 | NULL); |
| 155 | if (rc < 0) |
| 156 | goto fail; |
Konrad Rzeszutek Wilk | 9547689 | 2013-06-04 16:37:44 -0400 | [diff] [blame] | 157 | per_cpu(xen_resched_irq, cpu).irq = rc; |
Konrad Rzeszutek Wilk | b85fffe | 2013-06-04 16:47:17 -0400 | [diff] [blame] | 158 | per_cpu(xen_resched_irq, cpu).name = resched_name; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 159 | |
| 160 | callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu); |
| 161 | rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR, |
| 162 | cpu, |
| 163 | xen_call_function_interrupt, |
| 164 | IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING, |
| 165 | callfunc_name, |
| 166 | NULL); |
| 167 | if (rc < 0) |
| 168 | goto fail; |
Konrad Rzeszutek Wilk | 9547689 | 2013-06-04 16:37:44 -0400 | [diff] [blame] | 169 | per_cpu(xen_callfunc_irq, cpu).irq = rc; |
Konrad Rzeszutek Wilk | b85fffe | 2013-06-04 16:47:17 -0400 | [diff] [blame] | 170 | per_cpu(xen_callfunc_irq, cpu).name = callfunc_name; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 171 | |
Jeremy Fitzhardinge | ee523ca | 2008-03-17 16:37:18 -0700 | [diff] [blame] | 172 | debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu); |
| 173 | rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt, |
| 174 | IRQF_DISABLED | IRQF_PERCPU | IRQF_NOBALANCING, |
| 175 | debug_name, NULL); |
| 176 | if (rc < 0) |
| 177 | goto fail; |
Konrad Rzeszutek Wilk | 9547689 | 2013-06-04 16:37:44 -0400 | [diff] [blame] | 178 | per_cpu(xen_debug_irq, cpu).irq = rc; |
Konrad Rzeszutek Wilk | b85fffe | 2013-06-04 16:47:17 -0400 | [diff] [blame] | 179 | per_cpu(xen_debug_irq, cpu).name = debug_name; |
Jeremy Fitzhardinge | ee523ca | 2008-03-17 16:37:18 -0700 | [diff] [blame] | 180 | |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 181 | callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu); |
| 182 | rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR, |
| 183 | cpu, |
| 184 | xen_call_function_single_interrupt, |
| 185 | IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING, |
| 186 | callfunc_name, |
| 187 | NULL); |
| 188 | if (rc < 0) |
| 189 | goto fail; |
Konrad Rzeszutek Wilk | 9547689 | 2013-06-04 16:37:44 -0400 | [diff] [blame] | 190 | per_cpu(xen_callfuncsingle_irq, cpu).irq = rc; |
Konrad Rzeszutek Wilk | b85fffe | 2013-06-04 16:47:17 -0400 | [diff] [blame] | 191 | per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name; |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 192 | |
Konrad Rzeszutek Wilk | 27d8b20 | 2013-04-16 14:37:04 -0400 | [diff] [blame] | 193 | /* |
| 194 | * The IRQ worker on PVHVM goes through the native path and uses the |
| 195 | * IPI mechanism. |
| 196 | */ |
| 197 | if (xen_hvm_domain()) |
| 198 | return 0; |
| 199 | |
Lin Ming | 1ff2b0c | 2012-04-21 00:11:05 +0800 | [diff] [blame] | 200 | callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu); |
| 201 | rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR, |
| 202 | cpu, |
| 203 | xen_irq_work_interrupt, |
| 204 | IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING, |
| 205 | callfunc_name, |
| 206 | NULL); |
| 207 | if (rc < 0) |
| 208 | goto fail; |
Konrad Rzeszutek Wilk | 9547689 | 2013-06-04 16:37:44 -0400 | [diff] [blame] | 209 | per_cpu(xen_irq_work, cpu).irq = rc; |
Konrad Rzeszutek Wilk | b85fffe | 2013-06-04 16:47:17 -0400 | [diff] [blame] | 210 | per_cpu(xen_irq_work, cpu).name = callfunc_name; |
Lin Ming | 1ff2b0c | 2012-04-21 00:11:05 +0800 | [diff] [blame] | 211 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 212 | return 0; |
| 213 | |
| 214 | fail: |
Konrad Rzeszutek Wilk | 53b94fd | 2013-06-04 16:31:34 -0400 | [diff] [blame] | 215 | xen_smp_intr_free(cpu); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 216 | return rc; |
| 217 | } |
| 218 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 219 | static void __init xen_fill_possible_map(void) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 220 | { |
| 221 | int i, rc; |
| 222 | |
Stefano Stabellini | ea5b8f7 | 2010-10-26 17:28:33 +0100 | [diff] [blame] | 223 | if (xen_initial_domain()) |
| 224 | return; |
| 225 | |
Mike Travis | e798673 | 2008-12-16 17:33:52 -0800 | [diff] [blame] | 226 | for (i = 0; i < nr_cpu_ids; i++) { |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 227 | rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL); |
Jeremy Fitzhardinge | 4560a29 | 2008-07-08 15:06:56 -0700 | [diff] [blame] | 228 | if (rc >= 0) { |
| 229 | num_processors++; |
Rusty Russell | 4f06289 | 2009-03-13 14:49:54 +1030 | [diff] [blame] | 230 | set_cpu_possible(i, true); |
Jeremy Fitzhardinge | 4560a29 | 2008-07-08 15:06:56 -0700 | [diff] [blame] | 231 | } |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 232 | } |
| 233 | } |
| 234 | |
Stefano Stabellini | ea5b8f7 | 2010-10-26 17:28:33 +0100 | [diff] [blame] | 235 | static void __init xen_filter_cpu_maps(void) |
| 236 | { |
| 237 | int i, rc; |
Konrad Rzeszutek Wilk | cf405ae | 2012-04-26 13:50:03 -0400 | [diff] [blame] | 238 | unsigned int subtract = 0; |
Stefano Stabellini | ea5b8f7 | 2010-10-26 17:28:33 +0100 | [diff] [blame] | 239 | |
| 240 | if (!xen_initial_domain()) |
| 241 | return; |
| 242 | |
Stefano Stabellini | 801fd14 | 2010-09-23 12:06:25 +0100 | [diff] [blame] | 243 | num_processors = 0; |
| 244 | disabled_cpus = 0; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 245 | for (i = 0; i < nr_cpu_ids; i++) { |
| 246 | rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL); |
| 247 | if (rc >= 0) { |
| 248 | num_processors++; |
| 249 | set_cpu_possible(i, true); |
Stefano Stabellini | 801fd14 | 2010-09-23 12:06:25 +0100 | [diff] [blame] | 250 | } else { |
| 251 | set_cpu_possible(i, false); |
| 252 | set_cpu_present(i, false); |
Konrad Rzeszutek Wilk | cf405ae | 2012-04-26 13:50:03 -0400 | [diff] [blame] | 253 | subtract++; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 254 | } |
| 255 | } |
Konrad Rzeszutek Wilk | cf405ae | 2012-04-26 13:50:03 -0400 | [diff] [blame] | 256 | #ifdef CONFIG_HOTPLUG_CPU |
| 257 | /* This is akin to using 'nr_cpus' on the Linux command line. |
| 258 | * Which is OK as when we use 'dom0_max_vcpus=X' we can only |
| 259 | * have up to X, while nr_cpu_ids is greater than X. This |
| 260 | * normally is not a problem, except when CPU hotplugging |
| 261 | * is involved and then there might be more than X CPUs |
| 262 | * in the guest - which will not work as there is no |
| 263 | * hypercall to expand the max number of VCPUs an already |
| 264 | * running guest has. So cap it up to X. */ |
| 265 | if (subtract) |
| 266 | nr_cpu_ids = nr_cpu_ids - subtract; |
| 267 | #endif |
| 268 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 269 | } |
| 270 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 271 | static void __init xen_smp_prepare_boot_cpu(void) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 272 | { |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 273 | BUG_ON(smp_processor_id() != 0); |
| 274 | native_smp_prepare_boot_cpu(); |
| 275 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 276 | /* We've switched to the "real" per-cpu gdt, so make sure the |
| 277 | old memory can be recycled */ |
Jeremy Fitzhardinge | 3834143 | 2009-02-02 13:55:31 -0800 | [diff] [blame] | 278 | make_lowmem_page_readwrite(xen_initial_gdt); |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 279 | |
Stefano Stabellini | ea5b8f7 | 2010-10-26 17:28:33 +0100 | [diff] [blame] | 280 | xen_filter_cpu_maps(); |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 281 | xen_setup_vcpu_info_placement(); |
Jeremy Fitzhardinge | bf7aab3 | 2013-08-09 19:51:52 +0530 | [diff] [blame] | 282 | xen_init_spinlocks(); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 283 | } |
| 284 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 285 | static void __init xen_smp_prepare_cpus(unsigned int max_cpus) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 286 | { |
| 287 | unsigned cpu; |
Andrew Jones | 900cba8 | 2009-12-18 10:31:31 +0100 | [diff] [blame] | 288 | unsigned int i; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 289 | |
Konrad Rzeszutek Wilk | ed467e6 | 2011-09-01 09:48:27 -0400 | [diff] [blame] | 290 | if (skip_ioapic_setup) { |
| 291 | char *m = (max_cpus == 0) ? |
| 292 | "The nosmp parameter is incompatible with Xen; " \ |
| 293 | "use Xen dom0_max_vcpus=1 parameter" : |
| 294 | "The noapic parameter is incompatible with Xen"; |
| 295 | |
| 296 | xen_raw_printk(m); |
| 297 | panic(m); |
| 298 | } |
Jeremy Fitzhardinge | 2d9e1e2 | 2008-07-07 12:07:53 -0700 | [diff] [blame] | 299 | xen_init_lock_cpu(0); |
| 300 | |
Konrad Rzeszutek Wilk | 06d0b5d | 2012-12-17 20:29:32 -0500 | [diff] [blame] | 301 | smp_store_boot_cpu_info(); |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 302 | cpu_data(0).x86_max_cores = 1; |
Andrew Jones | 900cba8 | 2009-12-18 10:31:31 +0100 | [diff] [blame] | 303 | |
| 304 | for_each_possible_cpu(i) { |
| 305 | zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL); |
| 306 | zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL); |
| 307 | zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL); |
| 308 | } |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 309 | set_cpu_sibling_map(0); |
| 310 | |
| 311 | if (xen_smp_intr_init(0)) |
| 312 | BUG(); |
| 313 | |
Mike Travis | b78936e | 2008-12-16 17:33:57 -0800 | [diff] [blame] | 314 | if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL)) |
| 315 | panic("could not allocate xen_cpu_initialized_map\n"); |
| 316 | |
| 317 | cpumask_copy(xen_cpu_initialized_map, cpumask_of(0)); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 318 | |
| 319 | /* Restrict the possible_map according to max_cpus. */ |
| 320 | while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) { |
Mike Travis | e798673 | 2008-12-16 17:33:52 -0800 | [diff] [blame] | 321 | for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 322 | continue; |
Rusty Russell | 4f06289 | 2009-03-13 14:49:54 +1030 | [diff] [blame] | 323 | set_cpu_possible(cpu, false); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 324 | } |
| 325 | |
Thomas Gleixner | 7eb43a6 | 2012-04-20 13:05:48 +0000 | [diff] [blame] | 326 | for_each_possible_cpu(cpu) |
Rusty Russell | 4f06289 | 2009-03-13 14:49:54 +1030 | [diff] [blame] | 327 | set_cpu_present(cpu, true); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 328 | } |
| 329 | |
Paul Gortmaker | 148f9bb | 2013-06-18 18:23:59 -0400 | [diff] [blame] | 330 | static int |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 331 | cpu_initialize_context(unsigned int cpu, struct task_struct *idle) |
| 332 | { |
| 333 | struct vcpu_guest_context *ctxt; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 334 | struct desc_struct *gdt; |
Jeremy Fitzhardinge | 9976b39 | 2009-02-27 09:19:26 -0800 | [diff] [blame] | 335 | unsigned long gdt_mfn; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 336 | |
Mike Travis | b78936e | 2008-12-16 17:33:57 -0800 | [diff] [blame] | 337 | if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map)) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 338 | return 0; |
| 339 | |
| 340 | ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL); |
| 341 | if (ctxt == NULL) |
| 342 | return -ENOMEM; |
| 343 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 344 | gdt = get_cpu_gdt_table(cpu); |
| 345 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 346 | ctxt->flags = VGCF_IN_KERNEL; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 347 | ctxt->user_regs.ss = __KERNEL_DS; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 348 | #ifdef CONFIG_X86_32 |
| 349 | ctxt->user_regs.fs = __KERNEL_PERCPU; |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 350 | ctxt->user_regs.gs = __KERNEL_STACK_CANARY; |
Jeremy Fitzhardinge | 795f99b | 2009-01-30 17:47:54 +0900 | [diff] [blame] | 351 | #else |
| 352 | ctxt->gs_base_kernel = per_cpu_offset(cpu); |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 353 | #endif |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 354 | ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 355 | |
| 356 | memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt)); |
| 357 | |
Konrad Rzeszutek Wilk | dacd45f | 2012-10-22 11:35:16 -0400 | [diff] [blame] | 358 | { |
| 359 | ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */ |
| 360 | ctxt->user_regs.ds = __USER_DS; |
| 361 | ctxt->user_regs.es = __USER_DS; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 362 | |
Konrad Rzeszutek Wilk | dacd45f | 2012-10-22 11:35:16 -0400 | [diff] [blame] | 363 | xen_copy_trap_info(ctxt->trap_ctxt); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 364 | |
Konrad Rzeszutek Wilk | dacd45f | 2012-10-22 11:35:16 -0400 | [diff] [blame] | 365 | ctxt->ldt_ents = 0; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 366 | |
Konrad Rzeszutek Wilk | dacd45f | 2012-10-22 11:35:16 -0400 | [diff] [blame] | 367 | BUG_ON((unsigned long)gdt & ~PAGE_MASK); |
Jeremy Fitzhardinge | 9976b39 | 2009-02-27 09:19:26 -0800 | [diff] [blame] | 368 | |
Konrad Rzeszutek Wilk | dacd45f | 2012-10-22 11:35:16 -0400 | [diff] [blame] | 369 | gdt_mfn = arbitrary_virt_to_mfn(gdt); |
| 370 | make_lowmem_page_readonly(gdt); |
| 371 | make_lowmem_page_readonly(mfn_to_virt(gdt_mfn)); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 372 | |
Konrad Rzeszutek Wilk | dacd45f | 2012-10-22 11:35:16 -0400 | [diff] [blame] | 373 | ctxt->gdt_frames[0] = gdt_mfn; |
| 374 | ctxt->gdt_ents = GDT_ENTRIES; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 375 | |
Konrad Rzeszutek Wilk | dacd45f | 2012-10-22 11:35:16 -0400 | [diff] [blame] | 376 | ctxt->kernel_ss = __KERNEL_DS; |
| 377 | ctxt->kernel_sp = idle->thread.sp0; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 378 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 379 | #ifdef CONFIG_X86_32 |
Konrad Rzeszutek Wilk | dacd45f | 2012-10-22 11:35:16 -0400 | [diff] [blame] | 380 | ctxt->event_callback_cs = __KERNEL_CS; |
| 381 | ctxt->failsafe_callback_cs = __KERNEL_CS; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 382 | #endif |
Konrad Rzeszutek Wilk | dacd45f | 2012-10-22 11:35:16 -0400 | [diff] [blame] | 383 | ctxt->event_callback_eip = |
| 384 | (unsigned long)xen_hypervisor_callback; |
| 385 | ctxt->failsafe_callback_eip = |
| 386 | (unsigned long)xen_failsafe_callback; |
| 387 | } |
| 388 | ctxt->user_regs.cs = __KERNEL_CS; |
| 389 | ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 390 | |
| 391 | per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir); |
| 392 | ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir)); |
| 393 | |
| 394 | if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt)) |
| 395 | BUG(); |
| 396 | |
| 397 | kfree(ctxt); |
| 398 | return 0; |
| 399 | } |
| 400 | |
Paul Gortmaker | 148f9bb | 2013-06-18 18:23:59 -0400 | [diff] [blame] | 401 | static int xen_cpu_up(unsigned int cpu, struct task_struct *idle) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 402 | { |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 403 | int rc; |
| 404 | |
Brian Gerst | c6f5e0a | 2009-01-19 00:38:58 +0900 | [diff] [blame] | 405 | per_cpu(current_task, cpu) = idle; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 406 | #ifdef CONFIG_X86_32 |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 407 | irq_ctx_init(cpu); |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 408 | #else |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 409 | clear_tsk_thread_flag(idle, TIF_FORK); |
Jeremy Fitzhardinge | 3834143 | 2009-02-02 13:55:31 -0800 | [diff] [blame] | 410 | per_cpu(kernel_stack, cpu) = |
| 411 | (unsigned long)task_stack_page(idle) - |
| 412 | KERNEL_STACK_OFFSET + THREAD_SIZE; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 413 | #endif |
Ian Campbell | 0288967 | 2009-11-24 09:32:48 -0800 | [diff] [blame] | 414 | xen_setup_runstate_info(cpu); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 415 | xen_setup_timer(cpu); |
Jeremy Fitzhardinge | 2d9e1e2 | 2008-07-07 12:07:53 -0700 | [diff] [blame] | 416 | xen_init_lock_cpu(cpu); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 417 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 418 | per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; |
| 419 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 420 | /* make sure interrupts start blocked */ |
| 421 | per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1; |
| 422 | |
| 423 | rc = cpu_initialize_context(cpu, idle); |
| 424 | if (rc) |
| 425 | return rc; |
| 426 | |
| 427 | if (num_online_cpus() == 1) |
Rusty Russell | 816afe4 | 2012-08-06 17:29:49 +0930 | [diff] [blame] | 428 | /* Just in case we booted with a single CPU. */ |
| 429 | alternatives_enable_smp(); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 430 | |
| 431 | rc = xen_smp_intr_init(cpu); |
| 432 | if (rc) |
| 433 | return rc; |
| 434 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 435 | rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL); |
| 436 | BUG_ON(rc); |
| 437 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 438 | while(per_cpu(cpu_state, cpu) != CPU_ONLINE) { |
Hannes Eder | 1207cf8e | 2009-03-05 20:13:57 +0100 | [diff] [blame] | 439 | HYPERVISOR_sched_op(SCHEDOP_yield, NULL); |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 440 | barrier(); |
| 441 | } |
| 442 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 443 | return 0; |
| 444 | } |
| 445 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 446 | static void xen_smp_cpus_done(unsigned int max_cpus) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 447 | { |
| 448 | } |
| 449 | |
Alex Nixon | 2737146 | 2008-09-08 13:43:33 +0100 | [diff] [blame] | 450 | #ifdef CONFIG_HOTPLUG_CPU |
Alex Nixon | 26fd105 | 2008-09-08 13:43:34 +0100 | [diff] [blame] | 451 | static int xen_cpu_disable(void) |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 452 | { |
| 453 | unsigned int cpu = smp_processor_id(); |
| 454 | if (cpu == 0) |
| 455 | return -EBUSY; |
| 456 | |
| 457 | cpu_disable_common(); |
| 458 | |
| 459 | load_cr3(swapper_pg_dir); |
| 460 | return 0; |
| 461 | } |
| 462 | |
Alex Nixon | 26fd105 | 2008-09-08 13:43:34 +0100 | [diff] [blame] | 463 | static void xen_cpu_die(unsigned int cpu) |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 464 | { |
Konrad Rzeszutek Wilk | b12abaa | 2013-04-08 20:56:35 -0400 | [diff] [blame] | 465 | while (xen_pv_domain() && HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) { |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 466 | current->state = TASK_UNINTERRUPTIBLE; |
| 467 | schedule_timeout(HZ/10); |
| 468 | } |
Konrad Rzeszutek Wilk | 53b94fd | 2013-06-04 16:31:34 -0400 | [diff] [blame] | 469 | xen_smp_intr_free(cpu); |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 470 | xen_uninit_lock_cpu(cpu); |
| 471 | xen_teardown_timer(cpu); |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 472 | } |
| 473 | |
Paul Gortmaker | 148f9bb | 2013-06-18 18:23:59 -0400 | [diff] [blame] | 474 | static void xen_play_dead(void) /* used only with HOTPLUG_CPU */ |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 475 | { |
| 476 | play_dead_common(); |
| 477 | HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL); |
| 478 | cpu_bringup(); |
Konrad Rzeszutek Wilk | 466318a | 2013-06-03 10:33:55 -0400 | [diff] [blame] | 479 | /* |
| 480 | * commit 4b0c0f294 (tick: Cleanup NOHZ per cpu data on cpu down) |
| 481 | * clears certain data that the cpu_idle loop (which called us |
| 482 | * and that we return from) expects. The only way to get that |
| 483 | * data back is to call: |
| 484 | */ |
| 485 | tick_nohz_idle_enter(); |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 486 | } |
| 487 | |
Alex Nixon | 2737146 | 2008-09-08 13:43:33 +0100 | [diff] [blame] | 488 | #else /* !CONFIG_HOTPLUG_CPU */ |
Alex Nixon | 26fd105 | 2008-09-08 13:43:34 +0100 | [diff] [blame] | 489 | static int xen_cpu_disable(void) |
Alex Nixon | 2737146 | 2008-09-08 13:43:33 +0100 | [diff] [blame] | 490 | { |
| 491 | return -ENOSYS; |
| 492 | } |
| 493 | |
Alex Nixon | 26fd105 | 2008-09-08 13:43:34 +0100 | [diff] [blame] | 494 | static void xen_cpu_die(unsigned int cpu) |
Alex Nixon | 2737146 | 2008-09-08 13:43:33 +0100 | [diff] [blame] | 495 | { |
| 496 | BUG(); |
| 497 | } |
| 498 | |
Alex Nixon | 26fd105 | 2008-09-08 13:43:34 +0100 | [diff] [blame] | 499 | static void xen_play_dead(void) |
Alex Nixon | 2737146 | 2008-09-08 13:43:33 +0100 | [diff] [blame] | 500 | { |
| 501 | BUG(); |
| 502 | } |
| 503 | |
| 504 | #endif |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 505 | static void stop_self(void *v) |
| 506 | { |
| 507 | int cpu = smp_processor_id(); |
| 508 | |
| 509 | /* make sure we're not pinning something down */ |
| 510 | load_cr3(swapper_pg_dir); |
| 511 | /* should set up a minimal gdt */ |
| 512 | |
Ian Campbell | 086748e | 2010-08-03 14:55:14 -0700 | [diff] [blame] | 513 | set_cpu_online(cpu, false); |
| 514 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 515 | HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL); |
| 516 | BUG(); |
| 517 | } |
| 518 | |
Alok Kataria | 76fac07 | 2010-10-11 14:37:08 -0700 | [diff] [blame] | 519 | static void xen_stop_other_cpus(int wait) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 520 | { |
Alok Kataria | 76fac07 | 2010-10-11 14:37:08 -0700 | [diff] [blame] | 521 | smp_call_function(stop_self, NULL, wait); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 522 | } |
| 523 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 524 | static void xen_smp_send_reschedule(int cpu) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 525 | { |
| 526 | xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR); |
| 527 | } |
| 528 | |
Ben Guthro | f447d56 | 2012-04-21 00:11:04 +0800 | [diff] [blame] | 529 | static void __xen_send_IPI_mask(const struct cpumask *mask, |
| 530 | int vector) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 531 | { |
| 532 | unsigned cpu; |
| 533 | |
Mike Travis | bcda016 | 2008-12-16 17:33:59 -0800 | [diff] [blame] | 534 | for_each_cpu_and(cpu, mask, cpu_online_mask) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 535 | xen_send_IPI_one(cpu, vector); |
| 536 | } |
| 537 | |
Mike Travis | bcda016 | 2008-12-16 17:33:59 -0800 | [diff] [blame] | 538 | static void xen_smp_send_call_function_ipi(const struct cpumask *mask) |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 539 | { |
| 540 | int cpu; |
| 541 | |
Ben Guthro | f447d56 | 2012-04-21 00:11:04 +0800 | [diff] [blame] | 542 | __xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR); |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 543 | |
| 544 | /* Make sure other vcpus get a chance to run if they need to. */ |
Mike Travis | bcda016 | 2008-12-16 17:33:59 -0800 | [diff] [blame] | 545 | for_each_cpu(cpu, mask) { |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 546 | if (xen_vcpu_stolen(cpu)) { |
Hannes Eder | 1207cf8e | 2009-03-05 20:13:57 +0100 | [diff] [blame] | 547 | HYPERVISOR_sched_op(SCHEDOP_yield, NULL); |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 548 | break; |
| 549 | } |
| 550 | } |
| 551 | } |
| 552 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 553 | static void xen_smp_send_call_function_single_ipi(int cpu) |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 554 | { |
Ben Guthro | f447d56 | 2012-04-21 00:11:04 +0800 | [diff] [blame] | 555 | __xen_send_IPI_mask(cpumask_of(cpu), |
Mike Travis | e798673 | 2008-12-16 17:33:52 -0800 | [diff] [blame] | 556 | XEN_CALL_FUNCTION_SINGLE_VECTOR); |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 557 | } |
| 558 | |
Ben Guthro | f447d56 | 2012-04-21 00:11:04 +0800 | [diff] [blame] | 559 | static inline int xen_map_vector(int vector) |
| 560 | { |
| 561 | int xen_vector; |
| 562 | |
| 563 | switch (vector) { |
| 564 | case RESCHEDULE_VECTOR: |
| 565 | xen_vector = XEN_RESCHEDULE_VECTOR; |
| 566 | break; |
| 567 | case CALL_FUNCTION_VECTOR: |
| 568 | xen_vector = XEN_CALL_FUNCTION_VECTOR; |
| 569 | break; |
| 570 | case CALL_FUNCTION_SINGLE_VECTOR: |
| 571 | xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR; |
| 572 | break; |
Lin Ming | 1ff2b0c | 2012-04-21 00:11:05 +0800 | [diff] [blame] | 573 | case IRQ_WORK_VECTOR: |
| 574 | xen_vector = XEN_IRQ_WORK_VECTOR; |
| 575 | break; |
Konrad Rzeszutek Wilk | 6efa20e | 2013-07-19 11:51:31 -0400 | [diff] [blame] | 576 | #ifdef CONFIG_X86_64 |
| 577 | case NMI_VECTOR: |
| 578 | case APIC_DM_NMI: /* Some use that instead of NMI_VECTOR */ |
| 579 | xen_vector = XEN_NMI_VECTOR; |
| 580 | break; |
| 581 | #endif |
Ben Guthro | f447d56 | 2012-04-21 00:11:04 +0800 | [diff] [blame] | 582 | default: |
| 583 | xen_vector = -1; |
| 584 | printk(KERN_ERR "xen: vector 0x%x is not implemented\n", |
| 585 | vector); |
| 586 | } |
| 587 | |
| 588 | return xen_vector; |
| 589 | } |
| 590 | |
| 591 | void xen_send_IPI_mask(const struct cpumask *mask, |
| 592 | int vector) |
| 593 | { |
| 594 | int xen_vector = xen_map_vector(vector); |
| 595 | |
| 596 | if (xen_vector >= 0) |
| 597 | __xen_send_IPI_mask(mask, xen_vector); |
| 598 | } |
| 599 | |
| 600 | void xen_send_IPI_all(int vector) |
| 601 | { |
| 602 | int xen_vector = xen_map_vector(vector); |
| 603 | |
| 604 | if (xen_vector >= 0) |
| 605 | __xen_send_IPI_mask(cpu_online_mask, xen_vector); |
| 606 | } |
| 607 | |
| 608 | void xen_send_IPI_self(int vector) |
| 609 | { |
| 610 | int xen_vector = xen_map_vector(vector); |
| 611 | |
| 612 | if (xen_vector >= 0) |
| 613 | xen_send_IPI_one(smp_processor_id(), xen_vector); |
| 614 | } |
| 615 | |
| 616 | void xen_send_IPI_mask_allbutself(const struct cpumask *mask, |
| 617 | int vector) |
| 618 | { |
| 619 | unsigned cpu; |
| 620 | unsigned int this_cpu = smp_processor_id(); |
Stefan Bader | 1db01b4 | 2013-05-08 16:37:35 +0200 | [diff] [blame] | 621 | int xen_vector = xen_map_vector(vector); |
Ben Guthro | f447d56 | 2012-04-21 00:11:04 +0800 | [diff] [blame] | 622 | |
Stefan Bader | 1db01b4 | 2013-05-08 16:37:35 +0200 | [diff] [blame] | 623 | if (!(num_online_cpus() > 1) || (xen_vector < 0)) |
Ben Guthro | f447d56 | 2012-04-21 00:11:04 +0800 | [diff] [blame] | 624 | return; |
| 625 | |
| 626 | for_each_cpu_and(cpu, mask, cpu_online_mask) { |
| 627 | if (this_cpu == cpu) |
| 628 | continue; |
| 629 | |
Stefan Bader | 1db01b4 | 2013-05-08 16:37:35 +0200 | [diff] [blame] | 630 | xen_send_IPI_one(cpu, xen_vector); |
Ben Guthro | f447d56 | 2012-04-21 00:11:04 +0800 | [diff] [blame] | 631 | } |
| 632 | } |
| 633 | |
| 634 | void xen_send_IPI_allbutself(int vector) |
| 635 | { |
Stefan Bader | 1db01b4 | 2013-05-08 16:37:35 +0200 | [diff] [blame] | 636 | xen_send_IPI_mask_allbutself(cpu_online_mask, vector); |
Ben Guthro | f447d56 | 2012-04-21 00:11:04 +0800 | [diff] [blame] | 637 | } |
| 638 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 639 | static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id) |
| 640 | { |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 641 | irq_enter(); |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 642 | generic_smp_call_function_interrupt(); |
Brian Gerst | 1b437c8 | 2009-01-19 00:38:57 +0900 | [diff] [blame] | 643 | inc_irq_stat(irq_call_count); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 644 | irq_exit(); |
| 645 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 646 | return IRQ_HANDLED; |
| 647 | } |
| 648 | |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 649 | 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] | 650 | { |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 651 | irq_enter(); |
| 652 | generic_smp_call_function_single_interrupt(); |
Brian Gerst | 1b437c8 | 2009-01-19 00:38:57 +0900 | [diff] [blame] | 653 | inc_irq_stat(irq_call_count); |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 654 | irq_exit(); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 655 | |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 656 | return IRQ_HANDLED; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 657 | } |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 658 | |
Lin Ming | 1ff2b0c | 2012-04-21 00:11:05 +0800 | [diff] [blame] | 659 | static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id) |
| 660 | { |
| 661 | irq_enter(); |
| 662 | irq_work_run(); |
| 663 | inc_irq_stat(apic_irq_work_irqs); |
| 664 | irq_exit(); |
| 665 | |
| 666 | return IRQ_HANDLED; |
| 667 | } |
| 668 | |
Daniel Kiper | b53cede | 2011-05-04 20:18:05 +0200 | [diff] [blame] | 669 | static const struct smp_ops xen_smp_ops __initconst = { |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 670 | .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu, |
| 671 | .smp_prepare_cpus = xen_smp_prepare_cpus, |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 672 | .smp_cpus_done = xen_smp_cpus_done, |
| 673 | |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 674 | .cpu_up = xen_cpu_up, |
| 675 | .cpu_die = xen_cpu_die, |
| 676 | .cpu_disable = xen_cpu_disable, |
| 677 | .play_dead = xen_play_dead, |
| 678 | |
Alok Kataria | 76fac07 | 2010-10-11 14:37:08 -0700 | [diff] [blame] | 679 | .stop_other_cpus = xen_stop_other_cpus, |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 680 | .smp_send_reschedule = xen_smp_send_reschedule, |
| 681 | |
| 682 | .send_call_func_ipi = xen_smp_send_call_function_ipi, |
| 683 | .send_call_func_single_ipi = xen_smp_send_call_function_single_ipi, |
| 684 | }; |
| 685 | |
| 686 | void __init xen_smp_init(void) |
| 687 | { |
| 688 | smp_ops = xen_smp_ops; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 689 | xen_fill_possible_map(); |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 690 | } |
Stefano Stabellini | 99bbb3a | 2010-12-02 17:55:10 +0000 | [diff] [blame] | 691 | |
| 692 | static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus) |
| 693 | { |
| 694 | native_smp_prepare_cpus(max_cpus); |
| 695 | WARN_ON(xen_smp_intr_init(0)); |
| 696 | |
Stefano Stabellini | 99bbb3a | 2010-12-02 17:55:10 +0000 | [diff] [blame] | 697 | xen_init_lock_cpu(0); |
Stefano Stabellini | 99bbb3a | 2010-12-02 17:55:10 +0000 | [diff] [blame] | 698 | } |
| 699 | |
Paul Gortmaker | 148f9bb | 2013-06-18 18:23:59 -0400 | [diff] [blame] | 700 | static int xen_hvm_cpu_up(unsigned int cpu, struct task_struct *tidle) |
Stefano Stabellini | 99bbb3a | 2010-12-02 17:55:10 +0000 | [diff] [blame] | 701 | { |
| 702 | int rc; |
Chuck Anderson | fc78d34 | 2013-08-06 15:12:19 -0700 | [diff] [blame] | 703 | /* |
| 704 | * xen_smp_intr_init() needs to run before native_cpu_up() |
| 705 | * so that IPI vectors are set up on the booting CPU before |
| 706 | * it is marked online in native_cpu_up(). |
| 707 | */ |
| 708 | rc = xen_smp_intr_init(cpu); |
| 709 | WARN_ON(rc); |
| 710 | if (!rc) |
| 711 | rc = native_cpu_up(cpu, tidle); |
Konrad Rzeszutek Wilk | 1fb3a8b | 2013-08-13 11:47:21 -0400 | [diff] [blame] | 712 | |
| 713 | /* |
| 714 | * We must initialize the slowpath CPU kicker _after_ the native |
| 715 | * path has executed. If we initialized it before none of the |
| 716 | * unlocker IPI kicks would reach the booting CPU as the booting |
| 717 | * CPU had not set itself 'online' in cpu_online_mask. That mask |
| 718 | * is checked when IPIs are sent (on HVM at least). |
| 719 | */ |
| 720 | xen_init_lock_cpu(cpu); |
Stefano Stabellini | 99bbb3a | 2010-12-02 17:55:10 +0000 | [diff] [blame] | 721 | return rc; |
| 722 | } |
| 723 | |
| 724 | static void xen_hvm_cpu_die(unsigned int cpu) |
| 725 | { |
Konrad Rzeszutek Wilk | b12abaa | 2013-04-08 20:56:35 -0400 | [diff] [blame] | 726 | xen_cpu_die(cpu); |
Stefano Stabellini | 99bbb3a | 2010-12-02 17:55:10 +0000 | [diff] [blame] | 727 | native_cpu_die(cpu); |
| 728 | } |
| 729 | |
| 730 | void __init xen_hvm_smp_init(void) |
| 731 | { |
Stefano Stabellini | 3c05c4b | 2011-08-17 15:15:00 +0200 | [diff] [blame] | 732 | if (!xen_have_vector_callback) |
| 733 | return; |
Stefano Stabellini | 99bbb3a | 2010-12-02 17:55:10 +0000 | [diff] [blame] | 734 | smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus; |
| 735 | smp_ops.smp_send_reschedule = xen_smp_send_reschedule; |
| 736 | smp_ops.cpu_up = xen_hvm_cpu_up; |
| 737 | smp_ops.cpu_die = xen_hvm_cpu_die; |
| 738 | smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi; |
| 739 | smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi; |
| 740 | } |