int libxl__restore_emulator_xenstore_data(libxl__domain_create_state *dcs,
const char *ptr, uint32_t size)
{
STATE_AO_GC(dcs->ao);
const char *next = ptr, *end = ptr + size, *key, *val;
int rc;
const uint32_t domid = dcs->guest_domid;
const uint32_t dm_domid = libxl_get_stubdom_id(CTX, domid);
const char *xs_root = DEVICE_MODEL_XS_PATH(gc, dm_domid, domid, "");
while (next < end) {
key = next;
next = next_string(next, end);
/* Sanitise 'key'. */
if (!next) {
rc = ERROR_FAIL;
LOG(ERROR, "Key in xenstore data not NUL terminated");
goto out;
}
if (key[0] == '\0') {
rc = ERROR_FAIL;
LOG(ERROR, "empty key found in xenstore data");
goto out;
}
if (key[0] == '/') {
rc = ERROR_FAIL;
LOG(ERROR, "Key in xenstore data not relative");
goto out;
}
val = next;
next = next_string(next, end);
/* Sanitise 'val'. */
if (!next) {
rc = ERROR_FAIL;
LOG(ERROR, "Val in xenstore data not NUL terminated");
goto out;
}
libxl__xs_printf(gc, XBT_NULL,
GCSPRINTF("%s/%s", xs_root, key),
"%s", val);
}
rc = 0;
out:
return rc;
}
static int libxl__fill_dom0_memory_info(libxl__gc *gc, uint64_t *target_memkb,
uint64_t *max_memkb)
{
int rc;
libxl_dominfo info;
libxl_physinfo physinfo;
char *target = NULL, *staticmax = NULL, *endptr = NULL;
char *target_path = "/local/domain/0/memory/target";
char *max_path = "/local/domain/0/memory/static-max";
xs_transaction_t t;
libxl_ctx *ctx = libxl__gc_owner(gc);
libxl_dominfo_init(&info);
retry_transaction:
t = xs_transaction_start(ctx->xsh);
target = libxl__xs_read(gc, t, target_path);
staticmax = libxl__xs_read(gc, t, max_path);
if (target && staticmax) {
rc = 0;
goto out;
}
if (target) {
*target_memkb = strtoull(target, &endptr, 10);
if (*endptr != '\0') {
LOGED(ERROR, 0, "Invalid memory target %s from %s\n", target,
target_path);
rc = ERROR_FAIL;
goto out;
}
}
if (staticmax) {
*max_memkb = strtoull(staticmax, &endptr, 10);
if (*endptr != '\0') {
LOGED(ERROR, 0, "Invalid memory static-max %s from %s\n",
staticmax,
max_path);
rc = ERROR_FAIL;
goto out;
}
}
libxl_dominfo_dispose(&info);
libxl_dominfo_init(&info);
rc = libxl_domain_info(ctx, &info, 0);
if (rc < 0)
goto out;
rc = libxl_get_physinfo(ctx, &physinfo);
if (rc < 0)
goto out;
if (target == NULL) {
libxl__xs_printf(gc, t, target_path, "%"PRIu64, info.current_memkb);
*target_memkb = info.current_memkb;
}
if (staticmax == NULL) {
libxl__xs_printf(gc, t, max_path, "%"PRIu64, info.max_memkb);
*max_memkb = info.max_memkb;
}
rc = 0;
out:
if (!xs_transaction_end(ctx->xsh, t, 0)) {
if (errno == EAGAIN)
goto retry_transaction;
else
rc = ERROR_FAIL;
}
libxl_dominfo_dispose(&info);
return rc;
}
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;
}
