[PATCH v2 08/12] libxl: add API wrapper for libxl_get_free_memory

[Olaf Hering <olaf@xxxxxxxxx>]

Upcoming changes will use different LIBXL_API_VERSION variants.

Prepare libxl_get_free_memory, which changed storage size of parameter
"memkb" in Xen 4.8.

No functional change intended.

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
---
 src/libxl/libxl_api_wrapper.h | 19 +++++++++++++++++++
 src/libxl/libxl_conf.c        |  5 +++--
 src/libxl/libxl_domain.c      |  4 ++--
 tests/libxlmock.c             |  7 ++++++-
 4 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/src/libxl/libxl_api_wrapper.h b/src/libxl/libxl_api_wrapper.h
index 193f971919..a400bbd5a3 100644
--- a/src/libxl/libxl_api_wrapper.h
+++ b/src/libxl/libxl_api_wrapper.h
@@ -138,3 +138,22 @@ libxlDomainNeedMemoryWrapper(libxl_ctx *ctx,
 
     return ret;
 }
+
+static inline int
+libxlGetFreeMemoryWrapper(libxl_ctx *ctx, uint64_t *memkb)
+{
+    int ret;
+
+#if LIBXL_API_VERSION < 0x040800
+    {
+        uint32_t val32 = 0;
+
+        ret = libxl_get_free_memory(ctx, &val32);
+        *memkb = val32;
+    }
+#else
+    ret = libxl_get_free_memory(ctx, memkb);
+#endif
+
+    return ret;
+}
diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
index 4b6a7e6096..8fe04fd8e0 100644
--- a/src/libxl/libxl_conf.c
+++ b/src/libxl/libxl_conf.c
@@ -36,6 +36,7 @@
 #include "viruuid.h"
 #include "vircommand.h"
 #include "virsocketaddr.h"
+#include "libxl_api_wrapper.h"
 #include "libxl_domain.h"
 #include "libxl_conf.h"
 #include "libxl_utils.h"
@@ -1785,7 +1786,7 @@ libxlDriverConfigNew(void)
 int
 libxlDriverConfigInit(libxlDriverConfigPtr cfg)
 {
-    unsigned int free_mem;
+    uint64_t free_mem;
 
     if (g_mkdir_with_parents(cfg->logDir, 0777) < 0) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
@@ -1817,7 +1818,7 @@ libxlDriverConfigInit(libxlDriverConfigPtr cfg)
 
     /* This will fill xenstore info about free and dom0 memory if missing,
      * should be called before starting first domain */
-    if (libxl_get_free_memory(cfg->ctx, &free_mem)) {
+    if (libxlGetFreeMemoryWrapper(cfg->ctx, &free_mem)) {
         VIR_ERROR(_("Unable to configure libxl's memory management parameters"));
         return -1;
     }
diff --git a/src/libxl/libxl_domain.c b/src/libxl/libxl_domain.c
index d6554bc230..ac613b96b9 100644
--- a/src/libxl/libxl_domain.c
+++ b/src/libxl/libxl_domain.c
@@ -1009,7 +1009,7 @@ static int
 libxlDomainFreeMem(libxl_ctx *ctx, libxl_domain_config *d_config)
 {
     uint64_t needed_mem;
-    uint32_t free_mem;
+    uint64_t free_mem;
     int32_t target_mem;
     int tries = 3;
     int wait_secs = 10;
@@ -1018,7 +1018,7 @@ libxlDomainFreeMem(libxl_ctx *ctx, libxl_domain_config *d_config)
         goto error;
 
     do {
-        if (libxl_get_free_memory(ctx, &free_mem) < 0)
+        if (libxlGetFreeMemoryWrapper(ctx, &free_mem) < 0)
             goto error;
 
         if (free_mem >= needed_mem)
diff --git a/tests/libxlmock.c b/tests/libxlmock.c
index a36ca135f6..604dc4bfbe 100644
--- a/tests/libxlmock.c
+++ b/tests/libxlmock.c
@@ -67,7 +67,12 @@ VIR_MOCK_IMPL_RET_ARGS(libxl_get_version_info,
 VIR_MOCK_STUB_RET_ARGS(libxl_get_free_memory,
                        int, 0,
                        libxl_ctx *, ctx,
-                       uint32_t *, memkb);
+# if LIBXL_API_VERSION < 0x040800
+                       uint32_t *,
+# else
+                       uint64_t *,
+# endif
+                       memkb);
 
 VIR_MOCK_STUB_RET_ARGS(xc_interface_close,
                        int, 0,