Introduce libxl_set_relative_memory_target to modify the memory target
of a domain by a relative amount of memory in a single xenstore
transaction.
The first time we are reading/writing dom0 memory target, fill the
informations in xenstore if they are missing.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
diff -r 2731a625a7b1 tools/libxl/libxl.c
--- a/tools/libxl/libxl.c Wed Sep 01 12:53:24 2010 +0100
+++ b/tools/libxl/libxl.c Wed Sep 01 12:53:53 2010 +0100
@@ -2720,6 +2720,53 @@ int libxl_device_vfb_hard_shutdown(libxl
/******************************************************************************/
+static int libxl__fill_dom0_memory_info(libxl_gc *gc, uint32_t *target_memkb)
+{
+ int rc;
+ xc_domaininfo_t info;
+ char *target = 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);
+
+retry_transaction:
+ t = xs_transaction_start(ctx->xsh);
+
+ target = libxl_xs_read(gc, t, target_path);
+ if (target) {
+ *target_memkb = strtoul(target, &endptr, 10);
+ if (*endptr != '\0') {
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR,
+ "invalid memory target %s from %s\n", target, target_path);
+ rc = ERROR_FAIL;
+ goto out;
+ }
+ rc = 0;
+ goto out;
+ }
+
+ rc = xc_domain_getinfolist(ctx->xch, 0, 1, &info);
+ if (rc < 0)
+ return rc;
+
+ libxl_xs_write(gc, t, target_path, "%"PRIu32,
+ (uint32_t) PAGE_TO_MEMKB(info.tot_pages));
+ libxl_xs_write(gc, t, max_path, "%"PRIu32,
+ (uint32_t) PAGE_TO_MEMKB(info.max_pages));
+
+ *target_memkb = (uint32_t) PAGE_TO_MEMKB(info.tot_pages);
+ rc = 0;
+
+out:
+ if (!xs_transaction_end(ctx->xsh, t, 0))
+ if (errno == EAGAIN)
+ goto retry_transaction;
+
+
+ return rc;
+}
+
int libxl_set_memory_target(libxl_ctx *ctx, uint32_t domid, uint32_t
target_memkb, int enforce)
{
@@ -2787,6 +2834,163 @@ out:
return rc;
}
+int libxl_set_relative_memory_target(libxl_ctx *ctx, uint32_t domid,
+ int32_t relative_target_memkb, int enforce)
+{
+ libxl_gc gc = LIBXL_INIT_GC(ctx);
+ int rc = 1, abort = 0;
+ uint32_t memorykb = 0, videoram = 0, target_memkb = 0, new_target_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;
+
+retry_transaction:
+ t = xs_transaction_start(ctx->xsh);
+
+ target = libxl_xs_read(&gc, t, libxl_sprintf(&gc,
+ "%s/memory/target", dompath));
+ if (!target && !domid) {
+ xs_transaction_end(ctx->xsh, t, 1);
+ rc = libxl__fill_dom0_memory_info(&gc, &target_memkb);
+ if (rc < 0) {
+ abort = 1;
+ goto out;
+ }
+ goto retry_transaction;
+ } else if (!target) {
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR,
+ "cannot get target memory info from %s/memory/target\n",
+ dompath);
+ abort = 1;
+ goto out;
+ } else {
+ target_memkb = strtoul(target, &endptr, 10);
+ if (*endptr != '\0') {
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR,
+ "invalid memory target %s from %s/memory/target\n",
+ target, dompath);
+ abort = 1;
+ goto out;
+ }
+ }
+ memmax = libxl_xs_read(&gc, t, libxl_sprintf(&gc,
+ "%s/memory/static-max", dompath));
+ if (!memmax) {
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR,
+ "cannot get memory info from %s/memory/static-max\n",
+ dompath);
+ abort = 1;
+ goto out;
+ }
+ memorykb = strtoul(memmax, &endptr, 10);
+ if (*endptr != '\0') {
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR,
+ "invalid max memory %s from %s/memory/static-max\n",
+ memmax, dompath);
+ abort = 1;
+ goto out;
+ }
+
+ new_target_memkb = target_memkb + relative_target_memkb;
+ if (new_target_memkb > memorykb) {
+ XL_LOG(ctx, XL_LOG_ERROR,
+ "memory_dynamic_max must be less than or equal to"
+ " memory_static_max\n");
+ abort = 1;
+ goto out;
+ }
+
+ videoram_s = libxl_xs_read(&gc, t, libxl_sprintf(&gc,
+ "%s/memory/videoram", dompath));
+ videoram = videoram_s ? atoi(videoram_s) : 0;
+
+ if (enforce) {
+ memorykb = new_target_memkb;
+ rc = xc_domain_setmaxmem(ctx->xch, domid, memorykb +
+ LIBXL_MAXMEM_CONSTANT);
+ if (rc != 0) {
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR,
+ "xc_domain_setmaxmem domid=%d memkb=%d failed "
+ "rc=%d\n", domid, memorykb + LIBXL_MAXMEM_CONSTANT, rc);
+ abort = 1;
+ goto out;
+ }
+ libxl_xs_write(&gc, t, libxl_sprintf(&gc,
+ "%s/memory/static-max", dompath), "%"PRIu32,
+ memorykb);
+ }
+
+ rc = xc_domain_memory_set_pod_target(ctx->xch, domid,
+ (new_target_memkb - videoram) / 4, NULL, NULL, NULL);
+ if (rc != 0) {
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR,
+ "xc_domain_memory_set_pod_target domid=%d, memkb=%d "
+ "failed rc=%d\n", domid, (new_target_memkb - videoram) / 4,
+ rc);
+ abort = 1;
+ goto out;
+ }
+
+ libxl_xs_write(&gc, t, libxl_sprintf(&gc, "%s/memory/target",
+ dompath), "%"PRIu32, new_target_memkb);
+ rc = xc_domain_getinfolist(ctx->xch, domid, 1, &info);
+ if (rc != 1 || info.domain != domid) {
+ abort = 1;
+ goto out;
+ }
+ xcinfo2xlinfo(&info, &ptr);
+ uuid = libxl_uuid2string(&gc, ptr.uuid);
+ libxl_xs_write(&gc, t, libxl_sprintf(&gc, "/vm/%s/memory", uuid),
+ "%"PRIu32, new_target_memkb / 1024);
+
+out:
+ if (!xs_transaction_end(ctx->xsh, t, abort) && !abort)
+ if (errno == EAGAIN)
+ goto retry_transaction;
+
+ libxl_free_all(&gc);
+ return rc;
+}
+
+int libxl_get_memory_target(libxl_ctx *ctx, uint32_t domid, uint32_t
*out_target)
+{
+ libxl_gc gc = LIBXL_INIT_GC(ctx);
+ int rc = 1;
+ char *target = NULL, *endptr = NULL;
+ char *dompath = libxl_xs_get_dompath(&gc, domid);
+ uint32_t target_memkb;
+
+ target = libxl_xs_read(&gc, XBT_NULL, libxl_sprintf(&gc,
+ "%s/memory/target", dompath));
+ if (!target && !domid) {
+ rc = libxl__fill_dom0_memory_info(&gc, &target_memkb);
+ if (rc < 0)
+ goto out;
+ } else if (!target) {
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR,
+ "cannot get target memory info from %s/memory/target\n",
+ dompath);
+ goto out;
+ } else {
+ target_memkb = strtoul(target, &endptr, 10);
+ if (*endptr != '\0') {
+ XL_LOG_ERRNO(ctx, XL_LOG_ERROR,
+ "invalid memory target %s from %s/memory/target\n",
+ target, dompath);
+ goto out;
+ }
+ }
+ *out_target = target_memkb;
+ rc = 0;
+
+out:
+ libxl_free_all(&gc);
+ return rc;
+}
+
int libxl_button_press(libxl_ctx *ctx, uint32_t domid, libxl_button button)
{
int rc = -1;
diff -r 2731a625a7b1 tools/libxl/libxl.h
--- a/tools/libxl/libxl.h Wed Sep 01 12:53:24 2010 +0100
+++ b/tools/libxl/libxl.h Wed Sep 01 12:53:53 2010 +0100
@@ -321,6 +321,8 @@ int libxl_domain_unpause(libxl_ctx *ctx,
int libxl_domain_core_dump(libxl_ctx *ctx, uint32_t domid, const char
*filename);
int libxl_set_memory_target(libxl_ctx *ctx, uint32_t domid, uint32_t
target_memkb, int enforce);
+int libxl_set_relative_memory_target(libxl_ctx *ctx, uint32_t domid, int32_t
relative_target_memkb, int enforce);
+int libxl_get_memory_target(libxl_ctx *ctx, uint32_t domid, uint32_t
*out_target);
int libxl_vncviewer_exec(libxl_ctx *ctx, uint32_t domid, int autopass);
int libxl_console_exec(libxl_ctx *ctx, uint32_t domid, int cons_num,
libxl_console_constype type);
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