hypervisor/setup.c

   1 /*
   2  * Jailhouse, a Linux-based partitioning hypervisor
   3  *
   4  * Copyright (c) Siemens AG, 2013-2016
   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/mmio.h>
  17 #include <jailhouse/paging.h>
  18 #include <jailhouse/control.h>
  19 #include <jailhouse/string.h>
  20 #include <generated/version.h>
  21 #include <asm/spinlock.h>
  22
  23 extern u8 __text_start[], __page_pool[];
  24
  25 static const __attribute__((aligned(PAGE_SIZE))) u8 empty_page[PAGE_SIZE];
  26
  27 static DEFINE_SPINLOCK(init_lock);
  28 static unsigned int master_cpu_id = -1;
  29 static volatile unsigned int initialized_cpus;
  30 static volatile int error;
  31
  32 static void init_early(unsigned int cpu_id)
  33 {
  34         unsigned long core_and_percpu_size = hypervisor_header.core_size +
  35                 sizeof(struct per_cpu) * hypervisor_header.max_cpus;
  36         struct jailhouse_memory hv_page;
  37
  38         master_cpu_id = cpu_id;
  39
  40         system_config = (struct jailhouse_system *)
  41                 (JAILHOUSE_BASE + core_and_percpu_size);
  42
  43         arch_dbg_write_init();
  44
  45         printk("\nInitializing Jailhouse hypervisor %s on CPU %d\n",
  46                JAILHOUSE_VERSION, cpu_id);
  47         printk("Code location: %p\n", __text_start);
  48
  49         error = paging_init();
  50         if (error)
  51                 return;
  52
  53         root_cell.config = &system_config->root_cell;
  54
  55         root_cell.id = -1;
  56         error = cell_init(&root_cell);
  57         if (error)
  58                 return;
  59
  60         error = arch_init_early();
  61         if (error)
  62                 return;
  63
  64         /*
  65          * Back the region of the hypervisor core and per-CPU page with empty
  66          * pages for Linux. This allows to fault-in the hypervisor region into
  67          * Linux' page table before shutdown without triggering violations.
  68          */
  69         hv_page.phys_start = paging_hvirt2phys(empty_page);
  70         hv_page.virt_start = paging_hvirt2phys(&hypervisor_header);
  71         hv_page.size = PAGE_SIZE;
  72         hv_page.flags = JAILHOUSE_MEM_READ;
  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                 if (JAILHOUSE_MEMORY_IS_SUBPAGE(mem))
 124                         err = mmio_subpage_register(&root_cell, mem);
 125                 else
 126                         err = arch_map_memory_region(&root_cell, mem);
 127                 if (err)
 128                         return err;
 129         }
 130         return 0;
 131 }
 132
 133 static void init_late(void)
 134 {
 135         unsigned int cpu, expected_cpus = 0;
 136
 137         for_each_cpu(cpu, root_cell.cpu_set)
 138                 expected_cpus++;
 139         if (hypervisor_header.online_cpus != expected_cpus) {
 140                 error = -EINVAL;
 141                 return;
 142         }
 143
 144         error = arch_init_late();
 145         if (error)
 146                 return;
 147
 148         config_commit(&root_cell);
 149
 150         paging_dump_stats("after late setup");
 151 }
 152
 153 int entry(unsigned int cpu_id, struct per_cpu *cpu_data)
 154 {
 155         static volatile bool activate;
 156         bool master = false;
 157
 158         cpu_data->cpu_id = cpu_id;
 159
 160         spin_lock(&init_lock);
 161
 162         if (master_cpu_id == -1) {
 163                 master = true;
 164                 init_early(cpu_id);
 165         }
 166
 167         if (!error)
 168                 cpu_init(cpu_data);
 169
 170         spin_unlock(&init_lock);
 171
 172         while (!error && initialized_cpus < hypervisor_header.online_cpus)
 173                 cpu_relax();
 174
 175         if (!error && master) {
 176                 init_late();
 177                 if (!error) {
 178                         /*
 179                          * Make sure everything was committed before we signal
 180                          * the other CPUs that they can continue.
 181                          */
 182                         memory_barrier();
 183                         activate = true;
 184                 }
 185         } else {
 186                 while (!error && !activate)
 187                         cpu_relax();
 188         }
 189
 190         if (error) {
 191                 if (master)
 192                         arch_shutdown();
 193                 arch_cpu_restore(cpu_data, error);
 194                 return error;
 195         }
 196
 197         if (master)
 198                 printk("Activating hypervisor\n");
 199
 200         /* point of no return */
 201         arch_cpu_activate_vmm(cpu_data);
 202 }
 203
 204 /** Hypervisor description header. */
 205 struct jailhouse_header __attribute__((section(".header")))
 206 hypervisor_header = {
 207         .signature = JAILHOUSE_SIGNATURE,
 208         .core_size = (unsigned long)__page_pool - JAILHOUSE_BASE,
 209         .percpu_size = sizeof(struct per_cpu),
 210         .entry = arch_entry,
 211 };