ba3b40de42
The new pseries-4.0 machine type defaults to enabling Spectre/Meltdown mitigations. Unfortunately those mitigations aren't implemented for TCG because we're not yet sure if they're necessary or how to implement them. We don't fail fatally, but we do warn in this case, because it is quite plausible that Spectre/Meltdown can be exploited through TCG (at least for the guest to get access to the qemu address space). This create noise in our testcases though. So, modify the affected tests to explicitly disable the mitigations to suppress these warnings. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
105 lines
3 KiB
C
105 lines
3 KiB
C
/*
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* Test Open-Firmware-based machines.
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*
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* Copyright (c) 2016, 2017 Red Hat Inc.
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*
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* Author:
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* Thomas Huth <thuth@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2
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* or later. See the COPYING file in the top-level directory.
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*
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* This test is used to check that some Open Firmware based machines (i.e.
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* OpenBIOS or SLOF) can be started successfully in TCG mode. To do this, we
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* first put some Forth code into the "boot-command" Open Firmware environment
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* variable. This Forth code writes a well-known magic value to a known location
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* in memory. Then we start the guest so that the firmware can boot and finally
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* run the Forth code.
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* The testing code here then can finally check whether the value has been
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* successfully written into the guest memory.
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*/
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#include "qemu/osdep.h"
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#include "libqtest.h"
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#define MAGIC 0xcafec0de
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#define ADDRESS 0x4000
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static void check_guest_memory(QTestState *qts)
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{
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uint32_t signature;
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int i;
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/* Poll until code has run and modified memory. Wait at most 600 seconds */
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for (i = 0; i < 60000; ++i) {
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signature = qtest_readl(qts, ADDRESS);
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if (signature == MAGIC) {
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break;
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}
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g_usleep(10000);
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}
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g_assert_cmphex(signature, ==, MAGIC);
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}
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static void test_machine(const void *machine)
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{
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const char *extra_args = "";
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QTestState *qts;
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/*
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* The pseries firmware boots much faster without the default
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* devices, it also needs Spectre/Meltdown workarounds disabled to
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* avoid warnings with TCG
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*/
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if (strcmp(machine, "pseries") == 0) {
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extra_args = "-nodefaults"
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" -machine cap-cfpc=broken,cap-sbbc=broken,cap-ibs=broken";
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}
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qts = qtest_initf("-M %s,accel=tcg %s -prom-env 'use-nvramrc?=true' "
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"-prom-env 'nvramrc=%x %x l!' ", (const char *)machine,
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extra_args, MAGIC, ADDRESS);
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check_guest_memory(qts);
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qtest_quit(qts);
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}
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static void add_tests(const char *machines[])
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{
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int i;
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char *name;
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for (i = 0; machines[i] != NULL; i++) {
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name = g_strdup_printf("prom-env/%s", machines[i]);
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qtest_add_data_func(name, machines[i], test_machine);
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g_free(name);
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}
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}
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int main(int argc, char *argv[])
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{
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const char *sparc_machines[] = { "SPARCbook", "Voyager", "SS-20", NULL };
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const char *sparc64_machines[] = { "sun4u", NULL };
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const char *ppc_machines[] = { "mac99", "g3beige", NULL };
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const char *arch = qtest_get_arch();
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g_test_init(&argc, &argv, NULL);
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if (!strcmp(arch, "ppc")) {
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add_tests(ppc_machines);
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} else if (!strcmp(arch, "ppc64")) {
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add_tests(ppc_machines);
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if (g_test_slow()) {
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qtest_add_data_func("prom-env/pseries", "pseries", test_machine);
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}
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} else if (!strcmp(arch, "sparc")) {
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add_tests(sparc_machines);
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} else if (!strcmp(arch, "sparc64")) {
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add_tests(sparc64_machines);
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} else {
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g_assert_not_reached();
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}
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return g_test_run();
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}
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