9a709f06c8
With QEMU 4.0 an incompatible change was added to pc_piix, which makes it practical impossible to migrate domUs started with qemu2 or qemu3 to newer qemu versions. Commit7fccf2a068added and enabled a new member "smbus_no_migration_support". In commit4ab2f2a8aathe vmstate_acpi got new elements, which are conditionally filled. As a result, an incoming migration expected smbus related data unless smbus migration was disabled for a given MachineClass. Since first commit forgot to handle 'xenfv', domUs started with QEMU 4.x are incompatible with their QEMU siblings. Using other existing machine types, such as 'pc-i440fx-3.1', is not possible because 'xenfv' creates the 'xen-platform' PCI device at 00:02.0, while all other variants to run a domU would create it at 00:04.0. To cover both the existing and the broken case of 'xenfv' in a single qemu binary, a new compatibility variant of 'xenfv-4.2' must be added which targets domUs started with qemu 4.2. The existing 'xenfv' restores compatibility of QEMU 5.x with qemu 3.1. Host admins who started domUs with QEMU 4.x (preferrable QEMU 4.2) have to use a wrapper script which appends '-machine xenfv-4.2' to the device-model command line. This is only required if there is no maintenance window which allows to temporary shutdown the domU and restart it with a fixed device-model. The wrapper script is as simple as this: #!/bin/sh exec /usr/bin/qemu-system-i386 "$@" -machine xenfv-4.2 With xl this script will be enabled with device_model_override=, see xl.cfg(5). To live migrate a domU, adjust the existing domU.cfg and pass it to xl migrate or xl save/restore: xl migrate -C new-domU.cfg domU remote-host xl save domU CheckpointFile new-domU.cfg xl restore new-domU.cfg CheckpointFile With libvirt this script will be enabled with the <emulator> element in domU.xml. Use 'virsh edit' prior 'virsh migrate' to replace the existing <emulator> element to point it to the wrapper script. Signed-off-by: Olaf Hering <olaf@aepfle.de> Message-Id: <20200327151841.13877-1-olaf@aepfle.de> [Adjust tests for blacklisted machine types, simplifying the one in qom-test. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
102 lines
2.8 KiB
C
102 lines
2.8 KiB
C
/*
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* QTest testcase for QOM
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*
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* Copyright (c) 2013 SUSE LINUX Products GmbH
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qmp/qlist.h"
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#include "qemu/cutils.h"
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#include "libqtest.h"
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static void test_properties(QTestState *qts, const char *path, bool recurse)
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{
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char *child_path;
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QDict *response, *tuple, *tmp;
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QList *list;
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QListEntry *entry;
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g_test_message("Obtaining properties of %s", path);
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response = qtest_qmp(qts, "{ 'execute': 'qom-list',"
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" 'arguments': { 'path': %s } }", path);
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g_assert(response);
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if (!recurse) {
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qobject_unref(response);
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return;
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}
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g_assert(qdict_haskey(response, "return"));
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list = qobject_to(QList, qdict_get(response, "return"));
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QLIST_FOREACH_ENTRY(list, entry) {
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tuple = qobject_to(QDict, qlist_entry_obj(entry));
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bool is_child = strstart(qdict_get_str(tuple, "type"), "child<", NULL);
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bool is_link = strstart(qdict_get_str(tuple, "type"), "link<", NULL);
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if (is_child || is_link) {
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child_path = g_strdup_printf("%s/%s",
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path, qdict_get_str(tuple, "name"));
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test_properties(qts, child_path, is_child);
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g_free(child_path);
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} else {
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const char *prop = qdict_get_str(tuple, "name");
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g_test_message("Testing property %s.%s", path, prop);
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tmp = qtest_qmp(qts,
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"{ 'execute': 'qom-get',"
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" 'arguments': { 'path': %s, 'property': %s } }",
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path, prop);
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/* qom-get may fail but should not, e.g., segfault. */
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g_assert(tmp);
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qobject_unref(tmp);
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}
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}
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qobject_unref(response);
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}
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static void test_machine(gconstpointer data)
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{
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const char *machine = data;
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QDict *response;
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QTestState *qts;
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qts = qtest_initf("-machine %s", machine);
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test_properties(qts, "/machine", true);
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response = qtest_qmp(qts, "{ 'execute': 'quit' }");
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g_assert(qdict_haskey(response, "return"));
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qobject_unref(response);
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qtest_quit(qts);
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g_free((void *)machine);
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}
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static void add_machine_test_case(const char *mname)
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{
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char *path;
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/* Ignore blacklisted machines that have known problems */
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if (!memcmp("xenfv", mname, 5) || g_str_equal("xenpv", mname)) {
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return;
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}
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path = g_strdup_printf("qom/%s", mname);
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qtest_add_data_func(path, g_strdup(mname), test_machine);
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g_free(path);
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}
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int main(int argc, char **argv)
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{
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g_test_init(&argc, &argv, NULL);
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qtest_cb_for_every_machine(add_machine_test_case, g_test_quick());
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return g_test_run();
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}
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