/*
* Set the maximum memory size of the domain in the hypervisor. There is no
* change of the current memory size involved. The specified memory size can
* even be above the configured maxmem size of the domain, but the related
* Xenstore entry memory/static-max isn't modified!
*/
int libxl_domain_setmaxmem(libxl_ctx *ctx, uint32_t domid, uint64_t max_memkb)
{
GC_INIT(ctx);
char *mem, *endptr;
uint64_t memorykb, size;
char *dompath = libxl__xs_get_dompath(gc, domid);
int rc = 1;
libxl__domain_userdata_lock *lock = NULL;
libxl_domain_config d_config;
libxl_domain_config_init(&d_config);
CTX_LOCK;
lock = libxl__lock_domain_userdata(gc, domid);
if (!lock) {
rc = ERROR_LOCK_FAIL;
goto out;
}
mem = libxl__xs_read(gc, XBT_NULL, GCSPRINTF("%s/memory/target", dompath));
if (!mem) {
LOGED(ERROR, domid, "Cannot get memory info from %s/memory/target",
dompath);
goto out;
}
memorykb = strtoull(mem, &endptr, 10);
if (*endptr != '\0') {
LOGED(ERROR, domid, "Invalid memory %s from %s/memory/target\n",
mem, dompath);
goto out;
}
if (max_memkb < memorykb) {
LOGED(ERROR, domid,
"memory_static_max must be greater than or or equal to memory_dynamic_max");
goto out;
}
rc = libxl__get_domain_configuration(gc, domid, &d_config);
if (rc < 0) {
LOGE(ERROR, "unable to retrieve domain configuration");
goto out;
}
rc = libxl__arch_extra_memory(gc, &d_config.b_info, &size);
if (rc < 0) {
LOGE(ERROR, "Couldn't get arch extra constant memory size");
goto out;
}
rc = xc_domain_setmaxmem(ctx->xch, domid, max_memkb + size);
if (rc != 0) {
LOGED(ERROR, domid,
"xc_domain_setmaxmem domid=%d memkb=%"PRIu64" failed ""rc=%d\n",
domid, max_memkb + size, rc);
goto out;
}
rc = 0;
out:
libxl_domain_config_dispose(&d_config);
if (lock) libxl__unlock_domain_userdata(lock);
CTX_UNLOCK;
GC_FREE;
return rc;
}
static int build(xc_interface *xch)
{
char cmdline[512];
uint32_t ssid;
xen_domain_handle_t handle = { 0 };
int rv, xs_fd;
struct xc_dom_image *dom = NULL;
int limit_kb = (memory + 1) * 1024;
xs_fd = open("/dev/xen/xenbus_backend", O_RDWR);
if ( xs_fd == -1 )
{
fprintf(stderr, "Could not open /dev/xen/xenbus_backend\n");
return -1;
}
if ( flask )
{
rv = xc_flask_context_to_sid(xch, flask, strlen(flask), &ssid);
if ( rv )
{
fprintf(stderr, "xc_flask_context_to_sid failed\n");
goto err;
}
}
else
{
ssid = SECINITSID_DOMU;
}
rv = xc_domain_create(xch, ssid, handle, XEN_DOMCTL_CDF_xs_domain,
&domid, NULL);
if ( rv )
{
fprintf(stderr, "xc_domain_create failed\n");
goto err;
}
rv = xc_domain_max_vcpus(xch, domid, 1);
if ( rv )
{
fprintf(stderr, "xc_domain_max_vcpus failed\n");
goto err;
}
rv = xc_domain_setmaxmem(xch, domid, limit_kb);
if ( rv )
{
fprintf(stderr, "xc_domain_setmaxmem failed\n");
goto err;
}
rv = xc_domain_set_memmap_limit(xch, domid, limit_kb);
if ( rv )
{
fprintf(stderr, "xc_domain_set_memmap_limit failed\n");
goto err;
}
rv = ioctl(xs_fd, IOCTL_XENBUS_BACKEND_SETUP, domid);
if ( rv < 0 )
{
fprintf(stderr, "Xenbus setup ioctl failed\n");
goto err;
}
if ( param )
snprintf(cmdline, 512, "--event %d --internal-db %s", rv, param);
else
snprintf(cmdline, 512, "--event %d --internal-db", rv);
dom = xc_dom_allocate(xch, cmdline, NULL);
rv = xc_dom_kernel_file(dom, kernel);
if ( rv )
{
fprintf(stderr, "xc_dom_kernel_file failed\n");
goto err;
}
if ( ramdisk )
{
rv = xc_dom_ramdisk_file(dom, ramdisk);
if ( rv )
{
fprintf(stderr, "xc_dom_ramdisk_file failed\n");
goto err;
}
}
rv = xc_dom_boot_xen_init(dom, xch, domid);
if ( rv )
{
fprintf(stderr, "xc_dom_boot_xen_init failed\n");
goto err;
}
rv = xc_dom_parse_image(dom);
if ( rv )
{
fprintf(stderr, "xc_dom_parse_image failed\n");
goto err;
}
rv = xc_dom_mem_init(dom, memory);
if ( rv )
{
fprintf(stderr, "xc_dom_mem_init failed\n");
goto err;
}
rv = xc_dom_boot_mem_init(dom);
if ( rv )
{
fprintf(stderr, "xc_dom_boot_mem_init failed\n");
goto err;
}
rv = xc_dom_build_image(dom);
if ( rv )
{
fprintf(stderr, "xc_dom_build_image failed\n");
goto err;
}
rv = xc_dom_boot_image(dom);
if ( rv )
{
fprintf(stderr, "xc_dom_boot_image failed\n");
goto err;
}
rv = xc_domain_set_virq_handler(xch, domid, VIRQ_DOM_EXC);
if ( rv )
{
fprintf(stderr, "xc_domain_set_virq_handler failed\n");
goto err;
}
rv = xc_domain_unpause(xch, domid);
if ( rv )
{
fprintf(stderr, "xc_domain_unpause failed\n");
goto err;
}
rv = 0;
err:
if ( dom )
xc_dom_release(dom);
if ( xs_fd >= 0 )
close(xs_fd);
/* if we failed then destroy the domain */
if ( rv && domid != ~0 )
xc_domain_destroy(xch, domid);
return rv;
}
int libxl_set_memory_target(libxl_ctx *ctx, uint32_t domid,
int64_t target_memkb, int relative, int enforce)
{
GC_INIT(ctx);
int rc, r, lrc, abort_transaction = 0;
uint64_t memorykb, size;
uint64_t videoram = 0;
uint64_t current_target_memkb = 0, new_target_memkb = 0;
uint64_t current_max_memkb = 0;
char *memmax, *endptr, *videoram_s = NULL, *target = NULL;
char *dompath = libxl__xs_get_dompath(gc, domid);
xc_domaininfo_t info;
libxl_dominfo ptr;
char *uuid;
xs_transaction_t t;
libxl__domain_userdata_lock *lock;
libxl_domain_config d_config;
libxl_domain_config_init(&d_config);
CTX_LOCK;
lock = libxl__lock_domain_userdata(gc, domid);
if (!lock) {
rc = ERROR_LOCK_FAIL;
goto out_no_transaction;
}
rc = libxl__get_domain_configuration(gc, domid, &d_config);
if (rc < 0) {
LOGE(ERROR, "unable to retrieve domain configuration");
goto out_no_transaction;
}
rc = libxl__arch_extra_memory(gc, &d_config.b_info, &size);
if (rc < 0) {
LOGE(ERROR, "Couldn't get arch extra constant memory size");
goto out_no_transaction;
}
retry_transaction:
t = xs_transaction_start(ctx->xsh);
target = libxl__xs_read(gc, t, GCSPRINTF("%s/memory/target", dompath));
if (!target && !domid) {
if (!xs_transaction_end(ctx->xsh, t, 1)) {
rc = ERROR_FAIL;
goto out_no_transaction;
}
lrc = libxl__fill_dom0_memory_info(gc, ¤t_target_memkb,
¤t_max_memkb);
if (lrc < 0) { rc = ERROR_FAIL; goto out_no_transaction; }
goto retry_transaction;
} else if (!target) {
LOGED(ERROR, domid, "Cannot get target memory info from %s/memory/target",
dompath);
abort_transaction = 1;
rc = ERROR_FAIL;
goto out;
} else {
current_target_memkb = strtoull(target, &endptr, 10);
if (*endptr != '\0') {
LOGED(ERROR, domid, "Invalid memory target %s from %s/memory/target\n",
target, dompath);
abort_transaction = 1;
rc = ERROR_FAIL;
goto out;
}
}
memmax = libxl__xs_read(gc, t, GCSPRINTF("%s/memory/static-max", dompath));
if (!memmax) {
LOGED(ERROR, domid, "Cannot get memory info from %s/memory/static-max",
dompath);
abort_transaction = 1;
rc = ERROR_FAIL;
goto out;
}
memorykb = strtoull(memmax, &endptr, 10);
if (*endptr != '\0') {
LOGED(ERROR, domid, "Invalid max memory %s from %s/memory/static-max\n",
memmax, dompath);
abort_transaction = 1;
rc = ERROR_FAIL;
goto out;
}
videoram_s = libxl__xs_read(gc, t, GCSPRINTF("%s/memory/videoram",
dompath));
videoram = videoram_s ? atoi(videoram_s) : 0;
if (relative) {
if (target_memkb < 0 && llabs(target_memkb) > current_target_memkb)
new_target_memkb = 0;
else
new_target_memkb = current_target_memkb + target_memkb;
} else
new_target_memkb = target_memkb - videoram;
if (new_target_memkb > memorykb) {
LOGD(ERROR, domid,
"memory_dynamic_max must be less than or equal to"
" memory_static_max\n");
abort_transaction = 1;
rc = ERROR_INVAL;
goto out;
}
if (!domid && new_target_memkb < LIBXL_MIN_DOM0_MEM) {
LOGD(ERROR, domid,
"New target %"PRIu64" for dom0 is below the minimum threshold",
new_target_memkb);
abort_transaction = 1;
rc = ERROR_INVAL;
goto out;
}
if (enforce) {
memorykb = new_target_memkb + videoram;
r = xc_domain_setmaxmem(ctx->xch, domid, memorykb + size);
if (r != 0) {
LOGED(ERROR, domid,
"xc_domain_setmaxmem memkb=%"PRIu64" failed ""rc=%d\n",
memorykb + size,
r);
abort_transaction = 1;
rc = ERROR_FAIL;
goto out;
}
}
r = xc_domain_set_pod_target(ctx->xch, domid,
(new_target_memkb + size) / 4, NULL, NULL, NULL);
if (r != 0) {
LOGED(ERROR, domid,
"xc_domain_set_pod_target memkb=%"PRIu64" failed rc=%d\n",
(new_target_memkb + size) / 4,
r);
abort_transaction = 1;
rc = ERROR_FAIL;
goto out;
}
libxl__xs_printf(gc, t, GCSPRINTF("%s/memory/target", dompath),
"%"PRIu64, new_target_memkb);
r = xc_domain_getinfolist(ctx->xch, domid, 1, &info);
if (r != 1 || info.domain != domid) {
abort_transaction = 1;
rc = ERROR_FAIL;
goto out;
}
libxl_dominfo_init(&ptr);
libxl__xcinfo2xlinfo(ctx, &info, &ptr);
uuid = libxl__uuid2string(gc, ptr.uuid);
libxl__xs_printf(gc, t, GCSPRINTF("/vm/%s/memory", uuid),
"%"PRIu64, new_target_memkb / 1024);
libxl_dominfo_dispose(&ptr);
rc = 0;
out:
if (!xs_transaction_end(ctx->xsh, t, abort_transaction)
&& !abort_transaction)
if (errno == EAGAIN)
goto retry_transaction;
out_no_transaction:
libxl_domain_config_dispose(&d_config);
if (lock) libxl__unlock_domain_userdata(lock);
CTX_UNLOCK;
GC_FREE;
return rc;
}
