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                 jailhouse_cell_mem_regions(root_cell.config);
 120         unsigned int n;
 121         int err;
 122
 123         for (n = 0; n < root_cell.config->num_memory_regions; n++, mem++) {
 124                 err = arch_map_memory_region(&root_cell, mem);
 125                 if (err)
 126                         return err;
 127         }
 128         return 0;
 129 }
 130
 131 static void init_late(void)
 132 {
 133         unsigned int cpu, expected_cpus = 0;
 134
 135         for_each_cpu(cpu, root_cell.cpu_set)
 136                 expected_cpus++;
 137         if (hypervisor_header.online_cpus != expected_cpus) {
 138                 error = -EINVAL;
 139                 return;
 140         }
 141
 142         error = arch_init_late();
 143         if (error)
 144                 return;
 145
 146         config_commit(&root_cell);
 147
 148         paging_dump_stats("after late setup");
 149 }
 150
 151 int entry(unsigned int cpu_id, struct per_cpu *cpu_data)
 152 {
 153         static volatile bool activate;
 154         bool master = false;
 155
 156         cpu_data->cpu_id = cpu_id;
 157
 158         spin_lock(&init_lock);
 159
 160         if (master_cpu_id == -1) {
 161                 master = true;
 162                 init_early(cpu_id);
 163         }
 164
 165         if (!error)
 166                 cpu_init(cpu_data);
 167
 168         spin_unlock(&init_lock);
 169
 170         while (!error && initialized_cpus < hypervisor_header.online_cpus)
 171                 cpu_relax();
 172
 173         if (!error && master) {
 174                 init_late();
 175                 if (!error) {
 176                         /*
 177                          * Make sure everything was committed before we signal
 178                          * the other CPUs that they can continue.
 179                          */
 180                         memory_barrier();
 181                         activate = true;
 182                 }
 183         } else {
 184                 while (!error && !activate)
 185                         cpu_relax();
 186         }
 187
 188         if (error) {
 189                 if (master)
 190                         arch_shutdown();
 191                 arch_cpu_restore(cpu_data, error);
 192                 return error;
 193         }
 194
 195         if (master)
 196                 printk("Activating hypervisor\n");
 197
 198         /* point of no return */
 199         arch_cpu_activate_vmm(cpu_data);
 200 }
 201
 202 /** Hypervisor description header. */
 203 struct jailhouse_header __attribute__((section(".header")))
 204 hypervisor_header = {
 205         .signature = JAILHOUSE_SIGNATURE,
 206         .core_size = (unsigned long)__hv_core_end - JAILHOUSE_BASE,
 207         .percpu_size = sizeof(struct per_cpu),
 208         .entry = arch_entry,
 209 };