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migration: Support QLIST migration 

Support QLIST migration using the same principle as QTAILQ:
94869d5c52 ("migration: migrate QTAILQ").

The VMSTATE_QLIST_V macro has the same proto as VMSTATE_QTAILQ_V.
The change mainly resides in QLIST RAW macros: QLIST_RAW_INSERT_HEAD
and QLIST_RAW_REVERSE.

Tests also are provided.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Eric Auger 2020-01-13 14:48:23 +01:00 committed by Juan Quintela
parent 0ab994867c
commit 4746dbf8a9
5 changed files with 305 additions and 0 deletions
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21
include/migration/vmstate.h
View File

@ -229,6 +229,7 @@ extern const VMStateInfo vmstate_info_tmp;
extern const VMStateInfo vmstate_info_bitmap;
extern const VMStateInfo vmstate_info_qtailq;
extern const VMStateInfo vmstate_info_gtree;
extern const VMStateInfo vmstate_info_qlist;
#define type_check_2darray(t1,t2,n,m) ((t1(*)[n][m])0 - (t2*)0)
/*
@ -798,6 +799,26 @@ extern const VMStateInfo vmstate_info_gtree;
.offset = offsetof(_state, _field), \
}
/*
* For migrating a QLIST
* Target QLIST needs be properly initialized.
* _type: type of QLIST element
* _next: name of QLIST_ENTRY entry field in QLIST element
* _vmsd: VMSD for QLIST element
* size: size of QLIST element
* start: offset of QLIST_ENTRY in QTAILQ element
*/
#define VMSTATE_QLIST_V(_field, _state, _version, _vmsd, _type, _next) \
{ \
.name = (stringify(_field)), \
.version_id = (_version), \
.vmsd = &(_vmsd), \
.size = sizeof(_type), \
.info = &vmstate_info_qlist, \
.offset = offsetof(_state, _field), \
.start = offsetof(_type, _next), \
}
/* _f : field name
_f_n : num of elements field_name
_n : num of elements

39
include/qemu/queue.h
View File

@ -501,4 +501,43 @@ union { \
QTAILQ_RAW_TQH_CIRC(head)->tql_prev = QTAILQ_RAW_TQE_CIRC(elm, entry); \
} while (/*CONSTCOND*/0)
#define QLIST_RAW_FIRST(head) \
field_at_offset(head, 0, void *)
#define QLIST_RAW_NEXT(elm, entry) \
field_at_offset(elm, entry, void *)
#define QLIST_RAW_PREVIOUS(elm, entry) \
field_at_offset(elm, entry + sizeof(void *), void *)
#define QLIST_RAW_FOREACH(elm, head, entry) \
for ((elm) = *QLIST_RAW_FIRST(head); \
(elm); \
(elm) = *QLIST_RAW_NEXT(elm, entry))
#define QLIST_RAW_INSERT_HEAD(head, elm, entry) do { \
void *first = *QLIST_RAW_FIRST(head); \
*QLIST_RAW_FIRST(head) = elm; \
*QLIST_RAW_PREVIOUS(elm, entry) = QLIST_RAW_FIRST(head); \
if (first) { \
*QLIST_RAW_NEXT(elm, entry) = first; \
*QLIST_RAW_PREVIOUS(first, entry) = QLIST_RAW_NEXT(elm, entry); \
} else { \
*QLIST_RAW_NEXT(elm, entry) = NULL; \
} \
} while (0)
#define QLIST_RAW_REVERSE(head, elm, entry) do { \
void *iter = *QLIST_RAW_FIRST(head), *prev = NULL, *next; \
while (iter) { \
next = *QLIST_RAW_NEXT(iter, entry); \
*QLIST_RAW_PREVIOUS(iter, entry) = QLIST_RAW_NEXT(next, entry); \
*QLIST_RAW_NEXT(iter, entry) = prev; \
prev = iter; \
iter = next; \
} \
*QLIST_RAW_FIRST(head) = prev; \
*QLIST_RAW_PREVIOUS(prev, entry) = QLIST_RAW_FIRST(head); \
} while (0)
#endif /* QEMU_SYS_QUEUE_H */

5
migration/trace-events
View File

@ -76,6 +76,11 @@ get_gtree_end(const char *field_name, const char *key_vmsd_name, const char *val
put_gtree(const char *field_name, const char *key_vmsd_name, const char *val_vmsd_name, uint32_t nnodes) "%s(%s/%s) nnodes=%d"
put_gtree_end(const char *field_name, const char *key_vmsd_name, const char *val_vmsd_name, int ret) "%s(%s/%s) %d"
get_qlist(const char *field_name, const char *vmsd_name, int version_id) "%s(%s v%d)"
get_qlist_end(const char *field_name, const char *vmsd_name) "%s(%s)"
put_qlist(const char *field_name, const char *vmsd_name, int version_id) "%s(%s v%d)"
put_qlist_end(const char *field_name, const char *vmsd_name) "%s(%s)"
# qemu-file.c
qemu_file_fclose(void) ""

70
migration/vmstate-types.c
View File

@ -843,3 +843,73 @@ const VMStateInfo vmstate_info_gtree = {
.get = get_gtree,
.put = put_gtree,
};
static int put_qlist(QEMUFile *f, void *pv, size_t unused_size,
const VMStateField *field, QJSON *vmdesc)
{
const VMStateDescription *vmsd = field->vmsd;
/* offset of the QTAILQ entry in a QTAILQ element*/
size_t entry_offset = field->start;
void *elm;
int ret;
trace_put_qlist(field->name, vmsd->name, vmsd->version_id);
QLIST_RAW_FOREACH(elm, pv, entry_offset) {
qemu_put_byte(f, true);
ret = vmstate_save_state(f, vmsd, elm, vmdesc);
if (ret) {
error_report("%s: failed to save %s (%d)", field->name,
vmsd->name, ret);
return ret;
}
}
qemu_put_byte(f, false);
trace_put_qlist_end(field->name, vmsd->name);
return 0;
}
static int get_qlist(QEMUFile *f, void *pv, size_t unused_size,
const VMStateField *field)
{
int ret = 0;
const VMStateDescription *vmsd = field->vmsd;
/* size of a QLIST element */
size_t size = field->size;
/* offset of the QLIST entry in a QLIST element */
size_t entry_offset = field->start;
int version_id = field->version_id;
void *elm;
trace_get_qlist(field->name, vmsd->name, vmsd->version_id);
if (version_id > vmsd->version_id) {
error_report("%s %s", vmsd->name, "too new");
return -EINVAL;
}
if (version_id < vmsd->minimum_version_id) {
error_report("%s %s", vmsd->name, "too old");
return -EINVAL;
}
while (qemu_get_byte(f)) {
elm = g_malloc(size);
ret = vmstate_load_state(f, vmsd, elm, version_id);
if (ret) {
error_report("%s: failed to load %s (%d)", field->name,
vmsd->name, ret);
g_free(elm);
return ret;
}
QLIST_RAW_INSERT_HEAD(pv, elm, entry_offset);
}
QLIST_RAW_REVERSE(pv, elm, entry_offset);
trace_get_qlist_end(field->name, vmsd->name);
return ret;
}
const VMStateInfo vmstate_info_qlist = {
.name = "qlist",
.get = get_qlist,
.put = put_qlist,
};

170
tests/test-vmstate.c
View File

@ -926,6 +926,28 @@ static const VMStateDescription vmstate_domain = {
}
};
/* test QLIST Migration */
typedef struct TestQListElement {
uint32_t id;
QLIST_ENTRY(TestQListElement) next;
} TestQListElement;
typedef struct TestQListContainer {
uint32_t id;
QLIST_HEAD(, TestQListElement) list;
} TestQListContainer;
static const VMStateDescription vmstate_qlist_element = {
.name = "test/queue list",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(id, TestQListElement),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_iommu = {
.name = "iommu",
.version_id = 1,
@ -939,6 +961,18 @@ static const VMStateDescription vmstate_iommu = {
}
};
static const VMStateDescription vmstate_container = {
.name = "test/container/qlist",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(id, TestQListContainer),
VMSTATE_QLIST_V(list, TestQListContainer, 1, vmstate_qlist_element,
TestQListElement, next),
VMSTATE_END_OF_LIST()
}
};
uint8_t first_domain_dump[] = {
/* id */
0x00, 0x0, 0x0, 0x6,
@ -1229,6 +1263,140 @@ static void test_gtree_load_iommu(void)
qemu_fclose(fload);
}
static uint8_t qlist_dump[] = {
0x00, 0x00, 0x00, 0x01, /* container id */
0x1, /* start of a */
0x00, 0x00, 0x00, 0x0a,
0x1, /* start of b */
0x00, 0x00, 0x0b, 0x00,
0x1, /* start of c */
0x00, 0x0c, 0x00, 0x00,
0x1, /* start of d */
0x0d, 0x00, 0x00, 0x00,
0x0, /* end of list */
QEMU_VM_EOF, /* just to ensure we won't get EOF reported prematurely */
};
static TestQListContainer *alloc_container(void)
{
TestQListElement *a = g_malloc(sizeof(TestQListElement));
TestQListElement *b = g_malloc(sizeof(TestQListElement));
TestQListElement *c = g_malloc(sizeof(TestQListElement));
TestQListElement *d = g_malloc(sizeof(TestQListElement));
TestQListContainer *container = g_malloc(sizeof(TestQListContainer));
a->id = 0x0a;
b->id = 0x0b00;
c->id = 0xc0000;
d->id = 0xd000000;
container->id = 1;
QLIST_INIT(&container->list);
QLIST_INSERT_HEAD(&container->list, d, next);
QLIST_INSERT_HEAD(&container->list, c, next);
QLIST_INSERT_HEAD(&container->list, b, next);
QLIST_INSERT_HEAD(&container->list, a, next);
return container;
}
static void free_container(TestQListContainer *container)
{
TestQListElement *iter, *tmp;
QLIST_FOREACH_SAFE(iter, &container->list, next, tmp) {
QLIST_REMOVE(iter, next);
g_free(iter);
}
g_free(container);
}
static void compare_containers(TestQListContainer *c1, TestQListContainer *c2)
{
TestQListElement *first_item_c1, *first_item_c2;
while (!QLIST_EMPTY(&c1->list)) {
first_item_c1 = QLIST_FIRST(&c1->list);
first_item_c2 = QLIST_FIRST(&c2->list);
assert(first_item_c2);
assert(first_item_c1->id == first_item_c2->id);
QLIST_REMOVE(first_item_c1, next);
QLIST_REMOVE(first_item_c2, next);
g_free(first_item_c1);
g_free(first_item_c2);
}
assert(QLIST_EMPTY(&c2->list));
}
/*
* Check the prev & next fields are correct by doing list
* manipulations on the container. We will do that for both
* the source and the destination containers
*/
static void manipulate_container(TestQListContainer *c)
{
TestQListElement *prev = NULL, *iter = QLIST_FIRST(&c->list);
TestQListElement *elem;
elem = g_malloc(sizeof(TestQListElement));
elem->id = 0x12;
QLIST_INSERT_AFTER(iter, elem, next);
elem = g_malloc(sizeof(TestQListElement));
elem->id = 0x13;
QLIST_INSERT_HEAD(&c->list, elem, next);
while (iter) {
prev = iter;
iter = QLIST_NEXT(iter, next);
}
elem = g_malloc(sizeof(TestQListElement));
elem->id = 0x14;
QLIST_INSERT_BEFORE(prev, elem, next);
elem = g_malloc(sizeof(TestQListElement));
elem->id = 0x15;
QLIST_INSERT_AFTER(prev, elem, next);
QLIST_REMOVE(prev, next);
g_free(prev);
}
static void test_save_qlist(void)
{
TestQListContainer *container = alloc_container();
save_vmstate(&vmstate_container, container);
compare_vmstate(qlist_dump, sizeof(qlist_dump));
free_container(container);
}
static void test_load_qlist(void)
{
QEMUFile *fsave, *fload;
TestQListContainer *orig_container = alloc_container();
TestQListContainer *dest_container = g_malloc0(sizeof(TestQListContainer));
char eof;
QLIST_INIT(&dest_container->list);
fsave = open_test_file(true);
qemu_put_buffer(fsave, qlist_dump, sizeof(qlist_dump));
g_assert(!qemu_file_get_error(fsave));
qemu_fclose(fsave);
fload = open_test_file(false);
vmstate_load_state(fload, &vmstate_container, dest_container, 1);
eof = qemu_get_byte(fload);
g_assert(!qemu_file_get_error(fload));
g_assert_cmpint(eof, ==, QEMU_VM_EOF);
manipulate_container(orig_container);
manipulate_container(dest_container);
compare_containers(orig_container, dest_container);
free_container(orig_container);
free_container(dest_container);
}
typedef struct TmpTestStruct {
TestStruct *parent;
int64_t diff;
@ -1353,6 +1521,8 @@ int main(int argc, char **argv)
g_test_add_func("/vmstate/gtree/load/loaddomain", test_gtree_load_domain);
g_test_add_func("/vmstate/gtree/save/saveiommu", test_gtree_save_iommu);
g_test_add_func("/vmstate/gtree/load/loadiommu", test_gtree_load_iommu);
g_test_add_func("/vmstate/qlist/save/saveqlist", test_save_qlist);
g_test_add_func("/vmstate/qlist/load/loadqlist", test_load_qlist);
g_test_add_func("/vmstate/tmp_struct", test_tmp_struct);
g_test_run();