[libvirt] [PATCH] Balloon dom0 in libxl driver
Creating a domU on a freshly booted dom0 does not work,
because the libxl driver does not allocate memory for the domU.
After creating a domain with xl libvirt is able to create domains too.
This patch reserves enough memory for the domU first.
---
src/libxl/libxl_driver.c | 48 ++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 46 insertions(+), 2 deletions(-)
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index 247d78e..d4ca025 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -498,6 +498,46 @@ cleanup:
return ret;
}
+static int
+libxlFreeMem(libxlDomainObjPrivatePtr priv, libxl_domain_config *d_config)
+{
+ uint32_t needed_mem;
+ uint32_t free_mem;
+ int i;
+ int ret = -1;
+ int tries = 3;
+ int wait_secs = 10;
+
+ if ((ret = libxl_domain_need_memory(&priv->ctx, &d_config->b_info,
+ &d_config->dm_info,
+ &needed_mem)) >= 0) {
+ for (i = 0; i < tries; ++i) {
+ if ((ret = libxl_get_free_memory(&priv->ctx, &free_mem)) < 0)
+ break;
+
+ if (free_mem >= needed_mem) {
+ ret = 0;
+ break;
+ }
+
+ if ((ret = libxl_set_memory_target(&priv->ctx, 0,
+ free_mem - needed_mem,
+ /* relative */ 1, 0)) < 0)
+ break;
+
+ ret = libxl_wait_for_free_memory(&priv->ctx, 0, needed_mem,
+ wait_secs);
+ if (ret == 0 || ret != ERROR_NOMEM)
+ break;
+
+ if ((ret = libxl_wait_for_memory_target(&priv->ctx, 0, 1)) < 0)
+ break;
+ }
+ }
+
+ return ret;
+}
+
/*
* Start a domain through libxenlight.
*
@@ -521,8 +561,12 @@ libxlVmStart(libxlDriverPrivatePtr driver,
if (libxlBuildDomainConfig(driver, def, &d_config) < 0 )
return -1;
- //TODO: Balloon dom0 ??
- //ret = freemem(&d_config->b_info, &d_config->dm_info);
+ if (libxlFreeMem(priv, &d_config) < 0) {
+ libxlError(VIR_ERR_INTERNAL_ERROR,
+ _("libxenlight failed to get free memory for domain
'%s'"),
+ d_config.c_info.name);
+ goto error;
+ }
ret = libxl_domain_create_new(&priv->ctx, &d_config,
NULL, &child_console_pid, &domid);
--
1.7.4.3