hypervisor/setup.c

   1 /*
   2  * Jailhouse, a Linux-based partitioning hypervisor
   3  *
   4  * Copyright (c) Siemens AG, 2013, 2014
   5  *
   6  * Authors:
   7  *  Jan Kiszka <jan.kiszka@siemens.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  */
  12
  13 #include <jailhouse/processor.h>
  14 #include <jailhouse/printk.h>
  15 #include <jailhouse/entry.h>
  16 #include <jailhouse/paging.h>
  17 #include <jailhouse/control.h>
  18 #include <jailhouse/string.h>
  19 #include <generated/version.h>
  20 #include <asm/spinlock.h>
  21
  22 extern u8 __text_start[], __hv_core_end[];
  23
  24 static const __attribute__((aligned(PAGE_SIZE))) u8 empty_page[PAGE_SIZE];
  25
  26 static DEFINE_SPINLOCK(init_lock);
  27 static unsigned int master_cpu_id = -1;
  28 static volatile unsigned int initialized_cpus;
  29 static volatile int error;
  30
  31 static void init_early(unsigned int cpu_id)
  32 {
  33         unsigned long core_and_percpu_size;
  34         struct jailhouse_memory hv_page;
  35
  36         master_cpu_id = cpu_id;
  37
  38         arch_dbg_write_init();
  39
  40         printk("\nInitializing Jailhouse hypervisor %s on CPU %d\n",
  41                JAILHOUSE_VERSION, cpu_id);
  42         printk("Code location: %p\n", __text_start);
  43
  44         error = paging_init();
  45         if (error)
  46                 return;
  47
  48         root_cell.config = &system_config->root_cell;
  49
  50         error = check_mem_regions(&system_config->root_cell);
  51         if (error)
  52                 return;
  53
  54         root_cell.id = -1;
  55         error = cell_init(&root_cell);
  56         if (error)
  57                 return;
  58
  59         error = arch_init_early();
  60         if (error)
  61                 return;
  62
  63         /*
  64          * Back the region of the hypervisor core and per-CPU page with empty
  65          * pages for Linux. This allows to fault-in the hypervisor region into
  66          * Linux' page table before shutdown without triggering violations.
  67          */
  68         hv_page.phys_start = paging_hvirt2phys(empty_page);
  69         hv_page.virt_start = paging_hvirt2phys(&hypervisor_header);
  70         hv_page.size = PAGE_SIZE;
  71         hv_page.flags = JAILHOUSE_MEM_READ;
  72         core_and_percpu_size = (unsigned long)system_config - JAILHOUSE_BASE;
  73         while (core_and_percpu_size > 0) {
  74                 error = arch_map_memory_region(&root_cell, &hv_page);
  75                 if (error)
  76                         return;
  77                 core_and_percpu_size -= PAGE_SIZE;
  78                 hv_page.virt_start += PAGE_SIZE;
  79         }
  80
  81         paging_dump_stats("after early setup");
  82         printk("Initializing processors:\n");
  83 }
  84
  85 static void cpu_init(struct per_cpu *cpu_data)
  86 {
  87         int err = -EINVAL;
  88
  89         printk(" CPU %d... ", cpu_data->cpu_id);
  90
  91         if (!cpu_id_valid(cpu_data->cpu_id))
  92                 goto failed;
  93
  94         cpu_data->cell = &root_cell;
  95
  96         err = arch_cpu_init(cpu_data);
  97         if (err)
  98                 goto failed;
  99
 100         printk("OK\n");
 101
 102         /*
 103          * If this CPU is last, make sure everything was committed before we
 104          * signal the other CPUs spinning on initialized_cpus that they can
 105          * continue.
 106          */
 107         memory_barrier();
 108         initialized_cpus++;
 109         return;
 110
 111 failed:
 112         printk("FAILED\n");
 113         error = err;
 114 }
 115
 116 int map_root_memory_regions(void)
 117 {
 118         const struct jailhouse_memory *mem;
 119         unsigned int n;
 120         int err;
 121
 122         for_each_mem_region(mem, root_cell.config, n) {
 123                 err = arch_map_memory_region(&root_cell, mem);
 124                 if (err)
 125                         return err;
 126         }
 127         return 0;
 128 }
 129
 130 static void init_late(void)
 131 {
 132         unsigned int cpu, expected_cpus = 0;
 133
 134         for_each_cpu(cpu, root_cell.cpu_set)
 135                 expected_cpus++;
 136         if (hypervisor_header.online_cpus != expected_cpus) {
 137                 error = -EINVAL;
 138                 return;
 139         }
 140
 141         error = arch_init_late();
 142         if (error)
 143                 return;
 144
 145         config_commit(&root_cell);
 146
 147         paging_dump_stats("after late setup");
 148 }
 149
 150 int entry(unsigned int cpu_id, struct per_cpu *cpu_data)
 151 {
 152         static volatile bool activate;
 153         bool master = false;
 154
 155         cpu_data->cpu_id = cpu_id;
 156
 157         spin_lock(&init_lock);
 158
 159         if (master_cpu_id == -1) {
 160                 master = true;
 161                 init_early(cpu_id);
 162         }
 163
 164         if (!error)
 165                 cpu_init(cpu_data);
 166
 167         spin_unlock(&init_lock);
 168
 169         while (!error && initialized_cpus < hypervisor_header.online_cpus)
 170                 cpu_relax();
 171
 172         if (!error && master) {
 173                 init_late();
 174                 if (!error) {
 175                         /*
 176                          * Make sure everything was committed before we signal
 177                          * the other CPUs that they can continue.
 178                          */
 179                         memory_barrier();
 180                         activate = true;
 181                 }
 182         } else {
 183                 while (!error && !activate)
 184                         cpu_relax();
 185         }
 186
 187         if (error) {
 188                 if (master)
 189                         arch_shutdown();
 190                 arch_cpu_restore(cpu_data, error);
 191                 return error;
 192         }
 193
 194         if (master)
 195                 printk("Activating hypervisor\n");
 196
 197         /* point of no return */
 198         arch_cpu_activate_vmm(cpu_data);
 199 }
 200
 201 /** Hypervisor description header. */
 202 struct jailhouse_header __attribute__((section(".header")))
 203 hypervisor_header = {
 204         .signature = JAILHOUSE_SIGNATURE,
 205         .core_size = (unsigned long)__hv_core_end - JAILHOUSE_BASE,
 206         .percpu_size = sizeof(struct per_cpu),
 207         .entry = arch_entry,
 208 };