mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2025-03-04 00:58:38 +03:00
Implement save/restore for KVM guests
This commit is contained in:
Daniel P. Berrange
parent
383ae8c4ec
commit
024252d3e3
@ -1,3 +1,8 @@
|
||||
Mon Aug 13 21:46:48 EST 2007 Daniel P. Berrange <berrange@redhat.com>
|
||||
|
||||
* src/qemu_driver.c: Implement save & restore APIs for KVM
|
||||
guests using the migrate protocol. Patch from Jim Paris
|
||||
|
||||
Mon Aug 13 21:33:48 EST 2007 Daniel P. Berrange <berrange@redhat.com>
|
||||
|
||||
* src/qemu_driver.c: added qemudEscapeShellArg() helper function
|
||||
|
||||
@ -1921,28 +1921,235 @@ static char *qemudEscapeShellArg(const char *in)
|
||||
}
|
||||
|
||||
|
||||
#define QEMUD_SAVE_MAGIC "LibvirtQemudSave"
|
||||
#define QEMUD_SAVE_VERSION 1
|
||||
|
||||
struct qemud_save_header {
|
||||
char magic[sizeof(QEMUD_SAVE_MAGIC)-1];
|
||||
int version;
|
||||
int xml_len;
|
||||
int was_running;
|
||||
int unused[16];
|
||||
};
|
||||
|
||||
static int qemudDomainSave(virDomainPtr dom,
|
||||
const char *path ATTRIBUTE_UNUSED) {
|
||||
const char *path) {
|
||||
struct qemud_driver *driver = (struct qemud_driver *)dom->conn->privateData;
|
||||
struct qemud_vm *vm = qemudFindVMByID(driver, dom->id);
|
||||
char *command, *info;
|
||||
int fd;
|
||||
char *safe_path;
|
||||
char *xml;
|
||||
struct qemud_save_header header;
|
||||
|
||||
memset(&header, 0, sizeof(header));
|
||||
memcpy(header.magic, QEMUD_SAVE_MAGIC, sizeof(header.magic));
|
||||
header.version = QEMUD_SAVE_VERSION;
|
||||
|
||||
if (!vm) {
|
||||
qemudReportError(dom->conn, dom, NULL, VIR_ERR_INVALID_DOMAIN, "no domain with matching id %d", dom->id);
|
||||
qemudReportError(dom->conn, dom, NULL, VIR_ERR_INVALID_DOMAIN,
|
||||
"no domain with matching id %d", dom->id);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (!qemudIsActiveVM(vm)) {
|
||||
qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED, "domain is not running");
|
||||
qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"domain is not running");
|
||||
return -1;
|
||||
}
|
||||
qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED, "save is not supported");
|
||||
return -1;
|
||||
|
||||
/* Pause */
|
||||
if (vm->state == VIR_DOMAIN_RUNNING) {
|
||||
header.was_running = 1;
|
||||
if (qemudDomainSuspend(dom) != 0) {
|
||||
qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"failed to pause domain");
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
/* Get XML for the domain */
|
||||
xml = qemudGenerateXML(dom->conn, driver, vm, vm->def, 0);
|
||||
if (!xml) {
|
||||
qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"failed to get domain xml");
|
||||
return -1;
|
||||
}
|
||||
header.xml_len = strlen(xml) + 1;
|
||||
|
||||
/* Write header to file, followed by XML */
|
||||
if ((fd = open(path, O_CREAT|O_TRUNC|O_WRONLY, S_IRUSR|S_IWUSR)) < 0) {
|
||||
qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"failed to create '%s'", path);
|
||||
free(xml);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (safewrite(fd, &header, sizeof(header)) != sizeof(header)) {
|
||||
qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"failed to write save header");
|
||||
close(fd);
|
||||
free(xml);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (safewrite(fd, xml, header.xml_len) != header.xml_len) {
|
||||
qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"failed to write xml");
|
||||
close(fd);
|
||||
free(xml);
|
||||
return -1;
|
||||
}
|
||||
|
||||
close(fd);
|
||||
free(xml);
|
||||
|
||||
/* Migrate to file */
|
||||
safe_path = qemudEscapeShellArg(path);
|
||||
if (!safe_path) {
|
||||
qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"out of memory");
|
||||
return -1;
|
||||
}
|
||||
if (asprintf (&command, "migrate \"exec:"
|
||||
"dd of='%s' oflag=append conv=notrunc 2>/dev/null"
|
||||
"\"\r", safe_path) == -1) {
|
||||
qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"out of memory");
|
||||
free(safe_path);
|
||||
return -1;
|
||||
}
|
||||
free(safe_path);
|
||||
|
||||
if (qemudMonitorCommand(driver, vm, command, &info) < 0) {
|
||||
qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"migrate operation failed");
|
||||
free(command);
|
||||
return -1;
|
||||
}
|
||||
|
||||
free(info);
|
||||
free(command);
|
||||
|
||||
/* Shut it down */
|
||||
qemudShutdownVMDaemon(dom->conn, driver, vm);
|
||||
if (!vm->configFile[0])
|
||||
qemudRemoveInactiveVM(driver, vm);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
static int qemudDomainRestore(virConnectPtr conn,
|
||||
const char *path ATTRIBUTE_UNUSED) {
|
||||
/*struct qemud_driver *driver = (struct qemud_driver *)conn->privateData;*/
|
||||
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED, "restore is not supported");
|
||||
return -1;
|
||||
const char *path) {
|
||||
struct qemud_driver *driver = (struct qemud_driver *)conn->privateData;
|
||||
struct qemud_vm_def *def;
|
||||
struct qemud_vm *vm;
|
||||
int fd;
|
||||
char *xml;
|
||||
struct qemud_save_header header;
|
||||
|
||||
/* Verify the header and read the XML */
|
||||
if ((fd = open(path, O_RDONLY)) < 0) {
|
||||
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"cannot read domain image");
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (saferead(fd, &header, sizeof(header)) != sizeof(header)) {
|
||||
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"failed to read qemu header");
|
||||
close(fd);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (memcmp(header.magic, QEMUD_SAVE_MAGIC, sizeof(header.magic)) != 0) {
|
||||
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"image magic is incorrect");
|
||||
close(fd);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (header.version > QEMUD_SAVE_VERSION) {
|
||||
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"image version is not supported (%d > %d)",
|
||||
header.version, QEMUD_SAVE_VERSION);
|
||||
close(fd);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if ((xml = (char *)malloc(header.xml_len)) == NULL) {
|
||||
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"out of memory");
|
||||
close(fd);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (saferead(fd, xml, header.xml_len) != header.xml_len) {
|
||||
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"failed to read XML");
|
||||
close(fd);
|
||||
free(xml);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Create a domain from this XML */
|
||||
if (!(def = qemudParseVMDef(conn, driver, xml, NULL))) {
|
||||
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"failed to parse XML");
|
||||
close(fd);
|
||||
free(xml);
|
||||
return -1;
|
||||
}
|
||||
free(xml);
|
||||
|
||||
/* Ensure the name and UUID don't already exist in an active VM */
|
||||
vm = qemudFindVMByUUID(driver, def->uuid);
|
||||
if (!vm) vm = qemudFindVMByName(driver, def->name);
|
||||
if (vm && qemudIsActiveVM(vm)) {
|
||||
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"domain is already active as '%s'", vm->def->name);
|
||||
close(fd);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (!(vm = qemudAssignVMDef(conn, driver, def))) {
|
||||
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"failed to assign new VM");
|
||||
qemudFreeVMDef(def);
|
||||
close(fd);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Set the migration source and start it up. */
|
||||
snprintf(vm->migrateFrom, sizeof(vm->migrateFrom), "stdio");
|
||||
vm->stdin = fd;
|
||||
|
||||
if (qemudStartVMDaemon(conn, driver, vm) < 0) {
|
||||
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"failed to start VM");
|
||||
if (!vm->configFile[0])
|
||||
qemudRemoveInactiveVM(driver, vm);
|
||||
close(fd);
|
||||
return -1;
|
||||
}
|
||||
close(fd);
|
||||
vm->migrateFrom[0] = '\0';
|
||||
vm->stdin = -1;
|
||||
|
||||
/* If it was running before, resume it now. */
|
||||
if (header.was_running) {
|
||||
char *info;
|
||||
if (qemudMonitorCommand(driver, vm, "cont\r", &info) < 0) {
|
||||
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
|
||||
"failed to resume domain");
|
||||
return -1;
|
||||
}
|
||||
free(info);
|
||||
vm->state = VIR_DOMAIN_RUNNING;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user