[Xen-devel] [PATCH v7 10/16] xl: add global grant limit config items

[Juergen Gross <jgross@xxxxxxxx>]

Add xl.conf config items for default values of grant limits:

max_grant_frames will set the default for the maximum number of grant
frames for a domain which will take effect if the domain's config file
doesn't specify a value. If max_grant_frames isn't set in xl.conf it
will default to 32 for hosts with all memory below 16TB and to 64 for
hosts with memory above 16TB.

max_maptrack_frames will set the default for the maximum number of
maptrack frames for a domain. If max_maptrack_frames isn't set in
xl.conf it will default to 0, as normally only backend domains need
maptrack frames.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
V7:
- don't use xc_maximum_ram_page() but max_possible_mfn from physinfo
---
 docs/man/xl.conf.pod.5 | 12 ++++++++++++
 tools/xl/xl.c          | 15 +++++++++++++++
 tools/xl/xl.h          |  2 ++
 3 files changed, 29 insertions(+)

diff --git a/docs/man/xl.conf.pod.5 b/docs/man/xl.conf.pod.5
index 88ab506609..fe2cf27ea4 100644
--- a/docs/man/xl.conf.pod.5
+++ b/docs/man/xl.conf.pod.5
@@ -77,6 +77,18 @@ operations (primarily domain creation).
 
 Default: C</var/lock/xl>
 
+=item B<max_grant_frames=NUMBER>
+
+Sets the default value for the C<max_grant_frames> domain config value.
+
+Default: C<32> on hosts up to 16TB of memory, C<64> on hosts larger than 16TB
+
+=item B<max_maptrack_frames=NUMBER>
+
+Sets the default value for the C<max_maptrack_frames> domain config value.
+
+Default: C<0>
+
 =item B<vif.default.script="PATH">
 
 Configures the default hotplug script used by virtual network devices.
diff --git a/tools/xl/xl.c b/tools/xl/xl.c
index 02179a6229..c1bbb4b939 100644
--- a/tools/xl/xl.c
+++ b/tools/xl/xl.c
@@ -45,6 +45,8 @@ char *default_colo_proxy_script = NULL;
 enum output_format default_output_format = OUTPUT_FORMAT_JSON;
 int claim_mode = 1;
 bool progress_use_cr = 0;
+int max_grant_frames = -1;
+int max_maptrack_frames = 0;
 
 xentoollog_level minmsglevel = minmsglevel_default;
 
@@ -88,6 +90,7 @@ static void parse_global_config(const char *configfile,
     XLU_Config *config;
     int e;
     const char *buf;
+    libxl_physinfo physinfo;
 
     config = xlu_cfg_init(stderr, configfile);
     if (!config) {
@@ -188,6 +191,18 @@ static void parse_global_config(const char *configfile,
     xlu_cfg_replace_string (config, "colo.default.proxyscript",
         &default_colo_proxy_script, 0);
 
+    if (!xlu_cfg_get_long (config, "max_grant_frames", &l, 0))
+        max_grant_frames = l;
+    else {
+        libxl_physinfo_init(&physinfo);
+        max_grant_frames = (libxl_get_physinfo(ctx, &physinfo) != 0 ||
+                            !(physinfo.max_possible_mfn >> 32))
+                           ? 32 : 64;
+        libxl_physinfo_dispose(&physinfo);
+    }
+    if (!xlu_cfg_get_long (config, "max_maptrack_frames", &l, 0))
+        max_maptrack_frames = l;
+
     xlu_cfg_destroy(config);
 }
 
diff --git a/tools/xl/xl.h b/tools/xl/xl.h
index 31d660b89a..6b60d1db50 100644
--- a/tools/xl/xl.h
+++ b/tools/xl/xl.h
@@ -275,6 +275,8 @@ extern char *default_vifbackend;
 extern char *default_remus_netbufscript;
 extern char *default_colo_proxy_script;
 extern char *blkdev_start;
+extern int max_grant_frames;
+extern int max_maptrack_frames;
 
 enum output_format {
     OUTPUT_FORMAT_JSON,
-- 
2.12.3


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