tests/vmgenid-test.c

   1 /*
   2  * QTest testcase for VM Generation ID
   3  *
   4  * Copyright (c) 2016 Red Hat, Inc.
   5  * Copyright (c) 2017 Skyport Systems
   6  *
   7  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   8  * See the COPYING file in the top-level directory.
   9  */
  10
  11 #include <glib.h>
  12 #include <string.h>
  13 #include <unistd.h>
  14 #include "qemu/osdep.h"
  15 #include "qemu/bitmap.h"
  16 #include "qemu/uuid.h"
  17 #include "hw/acpi/acpi-defs.h"
  18 #include "boot-sector.h"
  19 #include "acpi-utils.h"
  20 #include "libqtest.h"
  21
  22 #define VGID_GUID "324e6eaf-d1d1-4bf6-bf41-b9bb6c91fb87"
  23 #define VMGENID_GUID_OFFSET 40   /* allow space for
  24                                   * OVMF SDT Header Probe Supressor
  25                                   */
  26 #define RSDP_ADDR_INVALID 0x100000 /* RSDP must be below this address */
  27
  28 typedef struct {
  29     AcpiTableHeader header;
  30     gchar name_op;
  31     gchar vgia[4];
  32     gchar val_op;
  33     uint32_t vgia_val;
  34 } QEMU_PACKED VgidTable;
  35
  36 static uint32_t acpi_find_vgia(void)
  37 {
  38     uint32_t rsdp_offset;
  39     uint32_t guid_offset = 0;
  40     AcpiRsdpDescriptor rsdp_table;
  41     uint32_t rsdt;
  42     AcpiRsdtDescriptorRev1 rsdt_table;
  43     int tables_nr;
  44     uint32_t *tables;
  45     AcpiTableHeader ssdt_table;
  46     VgidTable vgid_table;
  47     int i;
  48
  49     /* Wait for guest firmware to finish and start the payload. */
  50     boot_sector_test();
  51
  52     /* Tables should be initialized now. */
  53     rsdp_offset = acpi_find_rsdp_address();
  54
  55     g_assert_cmphex(rsdp_offset, <, RSDP_ADDR_INVALID);
  56
  57     acpi_parse_rsdp_table(rsdp_offset, &rsdp_table);
  58
  59     rsdt = rsdp_table.rsdt_physical_address;
  60     /* read the header */
  61     ACPI_READ_TABLE_HEADER(&rsdt_table, rsdt);
  62     ACPI_ASSERT_CMP(rsdt_table.signature, "RSDT");
  63
  64     /* compute the table entries in rsdt */
  65     tables_nr = (rsdt_table.length - sizeof(AcpiRsdtDescriptorRev1)) /
  66                 sizeof(uint32_t);
  67     g_assert_cmpint(tables_nr, >, 0);
  68
  69     /* get the addresses of the tables pointed by rsdt */
  70     tables = g_new0(uint32_t, tables_nr);
  71     ACPI_READ_ARRAY_PTR(tables, tables_nr, rsdt);
  72
  73     for (i = 0; i < tables_nr; i++) {
  74         ACPI_READ_TABLE_HEADER(&ssdt_table, tables[i]);
  75         if (!strncmp((char *)ssdt_table.oem_table_id, "VMGENID", 7)) {
  76             /* the first entry in the table should be VGIA
  77              * That's all we need
  78              */
  79             ACPI_READ_FIELD(vgid_table.name_op, tables[i]);
  80             g_assert(vgid_table.name_op == 0x08);  /* name */
  81             ACPI_READ_ARRAY(vgid_table.vgia, tables[i]);
  82             g_assert(memcmp(vgid_table.vgia, "VGIA", 4) == 0);
  83             ACPI_READ_FIELD(vgid_table.val_op, tables[i]);
  84             g_assert(vgid_table.val_op == 0x0C);  /* dword */
  85             ACPI_READ_FIELD(vgid_table.vgia_val, tables[i]);
  86             /* The GUID is written at a fixed offset into the fw_cfg file
  87              * in order to implement the "OVMF SDT Header probe suppressor"
  88              * see docs/specs/vmgenid.txt for more details
  89              */
  90             guid_offset = vgid_table.vgia_val + VMGENID_GUID_OFFSET;
  91             break;
  92         }
  93     }
  94     g_free(tables);
  95     return guid_offset;
  96 }
  97
  98 static void read_guid_from_memory(QemuUUID *guid)
  99 {
 100     uint32_t vmgenid_addr;
 101     int i;
 102
 103     vmgenid_addr = acpi_find_vgia();
 104     g_assert(vmgenid_addr);
 105
 106     /* Read the GUID directly from guest memory */
 107     for (i = 0; i < 16; i++) {
 108         guid->data[i] = readb(vmgenid_addr + i);
 109     }
 110     /* The GUID is in little-endian format in the guest, while QEMU
 111      * uses big-endian.  Swap after reading.
 112      */
 113     qemu_uuid_bswap(guid);
 114 }
 115
 116 static void read_guid_from_monitor(QemuUUID *guid)
 117 {
 118     QDict *rsp, *rsp_ret;
 119     const char *guid_str;
 120
 121     rsp = qmp("{ 'execute': 'query-vm-generation-id' }");
 122     if (qdict_haskey(rsp, "return")) {
 123         rsp_ret = qdict_get_qdict(rsp, "return");
 124         g_assert(qdict_haskey(rsp_ret, "guid"));
 125         guid_str = qdict_get_str(rsp_ret, "guid");
 126         g_assert(qemu_uuid_parse(guid_str, guid) == 0);
 127     }
 128     QDECREF(rsp);
 129 }
 130
 131 static char disk[] = "tests/vmgenid-test-disk-XXXXXX";
 132
 133 static char *guid_cmd_strdup(const char *guid)
 134 {
 135     return g_strdup_printf("-machine accel=kvm:tcg "
 136                            "-device vmgenid,id=testvgid,guid=%s "
 137                            "-drive id=hd0,if=none,file=%s,format=raw "
 138                            "-device ide-hd,drive=hd0 ",
 139                            guid, disk);
 140 }
 141
 142
 143 static void vmgenid_set_guid_test(void)
 144 {
 145     QemuUUID expected, measured;
 146     gchar *cmd;
 147
 148     g_assert(qemu_uuid_parse(VGID_GUID, &expected) == 0);
 149
 150     cmd = guid_cmd_strdup(VGID_GUID);
 151     qtest_start(cmd);
 152
 153     /* Read the GUID from accessing guest memory */
 154     read_guid_from_memory(&measured);
 155     g_assert(memcmp(measured.data, expected.data, sizeof(measured.data)) == 0);
 156
 157     qtest_quit(global_qtest);
 158     g_free(cmd);
 159 }
 160
 161 static void vmgenid_set_guid_auto_test(void)
 162 {
 163     char *cmd;
 164     QemuUUID measured;
 165
 166     cmd = guid_cmd_strdup("auto");
 167     qtest_start(cmd);
 168
 169     read_guid_from_memory(&measured);
 170
 171     /* Just check that the GUID is non-null */
 172     g_assert(!qemu_uuid_is_null(&measured));
 173
 174     qtest_quit(global_qtest);
 175     g_free(cmd);
 176 }
 177
 178 static void vmgenid_query_monitor_test(void)
 179 {
 180     QemuUUID expected, measured;
 181     gchar *cmd;
 182
 183     g_assert(qemu_uuid_parse(VGID_GUID, &expected) == 0);
 184
 185     cmd = guid_cmd_strdup(VGID_GUID);
 186     qtest_start(cmd);
 187
 188     /* Read the GUID via the monitor */
 189     read_guid_from_monitor(&measured);
 190     g_assert(memcmp(measured.data, expected.data, sizeof(measured.data)) == 0);
 191
 192     qtest_quit(global_qtest);
 193     g_free(cmd);
 194 }
 195
 196 int main(int argc, char **argv)
 197 {
 198     int ret;
 199
 200     ret = boot_sector_init(disk);
 201     if (ret) {
 202         return ret;
 203     }
 204
 205     g_test_init(&argc, &argv, NULL);
 206
 207     qtest_add_func("/vmgenid/vmgenid/set-guid",
 208                    vmgenid_set_guid_test);
 209     qtest_add_func("/vmgenid/vmgenid/set-guid-auto",
 210                    vmgenid_set_guid_auto_test);
 211     qtest_add_func("/vmgenid/vmgenid/query-monitor",
 212                    vmgenid_query_monitor_test);
 213     ret = g_test_run();
 214     boot_sector_cleanup(disk);
 215
 216     return ret;
 217 }