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tests: Add unit tests for the VM Generation ID feature 

The following tests are implemented:
* test that a GUID passed in by command line is propagated to the guest.
  Read the GUID from guest memory
* test that the "auto" argument to the GUID generates a valid GUID, as
  seen by the guest.
* test that a GUID passed in can be queried from the monitor

  This patch is loosely based on a previous patch from:
  Gal Hammer <ghammer@redhat.com>  and Igor Mammedov <imammedo@redhat.com>

Signed-off-by: Ben Warren <ben@skyportsystems.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Ben Warren 2017-07-01 23:54:03 -04:00 committed by Michael S. Tsirkin
parent b9ec9bd468
commit 83f3c70919
2 changed files with 205 additions and 0 deletions
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2
tests/Makefile.include
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@ -250,6 +250,7 @@ check-qtest-i386-y += tests/usb-hcd-xhci-test$(EXESUF)
gcov-files-i386-y += hw/usb/hcd-xhci.c
check-qtest-i386-y += tests/pc-cpu-test$(EXESUF)
check-qtest-i386-y += tests/q35-test$(EXESUF)
check-qtest-i386-y += tests/vmgenid-test$(EXESUF)
gcov-files-i386-y += hw/pci-host/q35.c
check-qtest-i386-$(CONFIG_VHOST_NET_TEST_i386) += tests/vhost-user-test$(EXESUF)
ifeq ($(CONFIG_VHOST_NET_TEST_i386),)
@ -760,6 +761,7 @@ tests/test-uuid$(EXESUF): tests/test-uuid.o $(test-util-obj-y)
tests/test-arm-mptimer$(EXESUF): tests/test-arm-mptimer.o
tests/test-qapi-util$(EXESUF): tests/test-qapi-util.o $(test-util-obj-y)
tests/numa-test$(EXESUF): tests/numa-test.o
tests/vmgenid-test$(EXESUF): tests/vmgenid-test.o tests/acpi-utils.o
tests/migration/stress$(EXESUF): tests/migration/stress.o
$(call quiet-command, $(LINKPROG) -static -O3 $(PTHREAD_LIB) -o $@ $< ,"LINK","$(TARGET_DIR)$@")

203
tests/vmgenid-test.c Normal file
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@ -0,0 +1,203 @@
/*
* QTest testcase for VM Generation ID
*
* Copyright (c) 2016 Red Hat, Inc.
* Copyright (c) 2017 Skyport Systems
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include <glib.h>
#include <string.h>
#include <unistd.h>
#include "qemu/osdep.h"
#include "qemu/bitmap.h"
#include "qemu/uuid.h"
#include "hw/acpi/acpi-defs.h"
#include "acpi-utils.h"
#include "libqtest.h"
#define VGID_GUID "324e6eaf-d1d1-4bf6-bf41-b9bb6c91fb87"
#define VMGENID_GUID_OFFSET 40 /* allow space for
* OVMF SDT Header Probe Supressor
*/
#define RSDP_ADDR_INVALID 0x100000 /* RSDP must be below this address */
#define RSDP_SLEEP_US 100000 /* Sleep for 100ms between tries */
#define RSDP_TRIES_MAX 100 /* Max total time is 10 seconds */
typedef struct {
AcpiTableHeader header;
gchar name_op;
gchar vgia[4];
gchar val_op;
uint32_t vgia_val;
} QEMU_PACKED VgidTable;
static uint32_t acpi_find_vgia(void)
{
uint32_t rsdp_offset;
uint32_t guid_offset = 0;
AcpiRsdpDescriptor rsdp_table;
uint32_t rsdt;
AcpiRsdtDescriptorRev1 rsdt_table;
int tables_nr;
uint32_t *tables;
AcpiTableHeader ssdt_table;
VgidTable vgid_table;
int i;
/* Tables may take a short time to be set up by the guest */
for (i = 0; i < RSDP_TRIES_MAX; i++) {
rsdp_offset = acpi_find_rsdp_address();
if (rsdp_offset < RSDP_ADDR_INVALID) {
break;
}
g_usleep(RSDP_SLEEP_US);
}
g_assert_cmphex(rsdp_offset, <, RSDP_ADDR_INVALID);
acpi_parse_rsdp_table(rsdp_offset, &rsdp_table);
rsdt = rsdp_table.rsdt_physical_address;
/* read the header */
ACPI_READ_TABLE_HEADER(&rsdt_table, rsdt);
ACPI_ASSERT_CMP(rsdt_table.signature, "RSDT");
/* compute the table entries in rsdt */
tables_nr = (rsdt_table.length - sizeof(AcpiRsdtDescriptorRev1)) /
sizeof(uint32_t);
g_assert_cmpint(tables_nr, >, 0);
/* get the addresses of the tables pointed by rsdt */
tables = g_new0(uint32_t, tables_nr);
ACPI_READ_ARRAY_PTR(tables, tables_nr, rsdt);
for (i = 0; i < tables_nr; i++) {
ACPI_READ_TABLE_HEADER(&ssdt_table, tables[i]);
if (!strncmp((char *)ssdt_table.oem_table_id, "VMGENID", 7)) {
/* the first entry in the table should be VGIA
* That's all we need
*/
ACPI_READ_FIELD(vgid_table.name_op, tables[i]);
g_assert(vgid_table.name_op == 0x08); /* name */
ACPI_READ_ARRAY(vgid_table.vgia, tables[i]);
g_assert(memcmp(vgid_table.vgia, "VGIA", 4) == 0);
ACPI_READ_FIELD(vgid_table.val_op, tables[i]);
g_assert(vgid_table.val_op == 0x0C); /* dword */
ACPI_READ_FIELD(vgid_table.vgia_val, tables[i]);
/* The GUID is written at a fixed offset into the fw_cfg file
* in order to implement the "OVMF SDT Header probe suppressor"
* see docs/specs/vmgenid.txt for more details
*/
guid_offset = vgid_table.vgia_val + VMGENID_GUID_OFFSET;
break;
}
}
g_free(tables);
return guid_offset;
}
static void read_guid_from_memory(QemuUUID *guid)
{
uint32_t vmgenid_addr;
int i;
vmgenid_addr = acpi_find_vgia();
g_assert(vmgenid_addr);
/* Read the GUID directly from guest memory */
for (i = 0; i < 16; i++) {
guid->data[i] = readb(vmgenid_addr + i);
}
/* The GUID is in little-endian format in the guest, while QEMU
* uses big-endian. Swap after reading.
*/
qemu_uuid_bswap(guid);
}
static void read_guid_from_monitor(QemuUUID *guid)
{
QDict *rsp, *rsp_ret;
const char *guid_str;
rsp = qmp("{ 'execute': 'query-vm-generation-id' }");
if (qdict_haskey(rsp, "return")) {
rsp_ret = qdict_get_qdict(rsp, "return");
g_assert(qdict_haskey(rsp_ret, "guid"));
guid_str = qdict_get_str(rsp_ret, "guid");
g_assert(qemu_uuid_parse(guid_str, guid) == 0);
}
QDECREF(rsp);
}
static void vmgenid_set_guid_test(void)
{
QemuUUID expected, measured;
gchar *cmd;
g_assert(qemu_uuid_parse(VGID_GUID, &expected) == 0);
cmd = g_strdup_printf("-machine accel=tcg -device vmgenid,id=testvgid,"
"guid=%s", VGID_GUID);
qtest_start(cmd);
/* Read the GUID from accessing guest memory */
read_guid_from_memory(&measured);
g_assert(memcmp(measured.data, expected.data, sizeof(measured.data)) == 0);
qtest_quit(global_qtest);
g_free(cmd);
}
static void vmgenid_set_guid_auto_test(void)
{
const char *cmd;
QemuUUID measured;
cmd = "-machine accel=tcg -device vmgenid,id=testvgid," "guid=auto";
qtest_start(cmd);
read_guid_from_memory(&measured);
/* Just check that the GUID is non-null */
g_assert(!qemu_uuid_is_null(&measured));
qtest_quit(global_qtest);
}
static void vmgenid_query_monitor_test(void)
{
QemuUUID expected, measured;
gchar *cmd;
g_assert(qemu_uuid_parse(VGID_GUID, &expected) == 0);
cmd = g_strdup_printf("-machine accel=tcg -device vmgenid,id=testvgid,"
"guid=%s", VGID_GUID);
qtest_start(cmd);
/* Read the GUID via the monitor */
read_guid_from_monitor(&measured);
g_assert(memcmp(measured.data, expected.data, sizeof(measured.data)) == 0);
qtest_quit(global_qtest);
g_free(cmd);
}
int main(int argc, char **argv)
{
int ret;
g_test_init(&argc, &argv, NULL);
qtest_add_func("/vmgenid/vmgenid/set-guid",
vmgenid_set_guid_test);
qtest_add_func("/vmgenid/vmgenid/set-guid-auto",
vmgenid_set_guid_auto_test);
qtest_add_func("/vmgenid/vmgenid/query-monitor",
vmgenid_query_monitor_test);
ret = g_test_run();
return ret;
}