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From: Paul Durrant <pdurrant@amazon.com>
To: <xen-devel@lists.xenproject.org>
Cc: Paul Durrant <pdurrant@amazon.com>,
	Ian Jackson <ian.jackson@eu.citrix.com>, Wei Liu <wl@xen.org>
Subject: [Xen-devel] [PATCH v3 5/6] xl.conf: introduce 'domid_policy'
Date: Thu, 16 Jan 2020 09:36:01 +0000
Message-ID: <20200116093602.4203-6-pdurrant@amazon.com> (raw)
In-Reply-To: <20200116093602.4203-1-pdurrant@amazon.com>

This patch adds a new global 'domid_policy' configuration option to decide
how domain id values are allocated for new domains. It may be set to one of
two values:

"xen", the default value, will cause an invalid domid value to be passed
to do_domain_create() preserving the existing behaviour of having Xen
choose the domid value during domain_create().

"random" will cause the special RANDOM_DOMID value to be passed to
do_domain_create() such that libxl__domain_make() will select a random
domid value.

Signed-off-by: Paul Durrant <pdurrant@amazon.com>
---
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Wei Liu <wl@xen.org>

v2:
 - New in v2
---
 docs/man/xl.conf.5.pod  | 10 ++++++++++
 tools/examples/xl.conf  |  4 ++++
 tools/xl/xl.c           | 10 ++++++++++
 tools/xl/xl.h           |  1 +
 tools/xl/xl_vmcontrol.c |  2 ++
 5 files changed, 27 insertions(+)

diff --git a/docs/man/xl.conf.5.pod b/docs/man/xl.conf.5.pod
index 207ab3e77a..41ee428744 100644
--- a/docs/man/xl.conf.5.pod
+++ b/docs/man/xl.conf.5.pod
@@ -45,6 +45,16 @@ The semantics of each C<KEY> defines which form of C<VALUE> is required.
 
 =over 4
 
+=item B<domid_policy="xen"|"random">
+
+Determines how domain-id is set when creating a new domain.
+
+If set to "xen" then the hypervisor will allocate new domain-id values on a sequential basis.
+
+If set to "random" then a random domain-id value will be chosen.
+
+Default: "xen"
+
 =item B<autoballoon="off"|"on"|"auto">
 
 If set to "on" then C<xl> will automatically reduce the amount of
diff --git a/tools/examples/xl.conf b/tools/examples/xl.conf
index 0446deb304..95f2f442d3 100644
--- a/tools/examples/xl.conf
+++ b/tools/examples/xl.conf
@@ -1,5 +1,9 @@
 ## Global XL config file ##
 
+# Set domain-id policy. "xen" means that the hypervisor will choose the
+# id of a new domain. "random" means that a random value will be chosen.
+#domid_policy="xen"
+
 # Control whether dom0 is ballooned down when xen doesn't have enough
 # free memory to create a domain.  "auto" means only balloon if dom0
 # starts with all the host's memory.
diff --git a/tools/xl/xl.c b/tools/xl/xl.c
index 3d4390a46d..2a5ddd4390 100644
--- a/tools/xl/xl.c
+++ b/tools/xl/xl.c
@@ -54,6 +54,7 @@ int claim_mode = 1;
 bool progress_use_cr = 0;
 int max_grant_frames = -1;
 int max_maptrack_frames = -1;
+libxl_domid domid_policy = INVALID_DOMID;
 
 xentoollog_level minmsglevel = minmsglevel_default;
 
@@ -228,6 +229,15 @@ static void parse_global_config(const char *configfile,
     else
         libxl_bitmap_set_any(&global_pv_affinity_mask);
 
+    if (!xlu_cfg_get_string (config, "domid_policy", &buf, 0)) {
+        if (!strcmp(buf, "xen"))
+            domid_policy = INVALID_DOMID;
+        else if (!strcmp(buf, "random"))
+            domid_policy = RANDOM_DOMID;
+        else
+            fprintf(stderr, "invalid domid_policy option");
+    }
+
     xlu_cfg_destroy(config);
 }
 
diff --git a/tools/xl/xl.h b/tools/xl/xl.h
index 60bdad8ffb..2b4709efb2 100644
--- a/tools/xl/xl.h
+++ b/tools/xl/xl.h
@@ -283,6 +283,7 @@ extern int max_maptrack_frames;
 extern libxl_bitmap global_vm_affinity_mask;
 extern libxl_bitmap global_hvm_affinity_mask;
 extern libxl_bitmap global_pv_affinity_mask;
+extern libxl_domid domid_policy;
 
 enum output_format {
     OUTPUT_FORMAT_JSON,
diff --git a/tools/xl/xl_vmcontrol.c b/tools/xl/xl_vmcontrol.c
index e520b1da79..39292acfe6 100644
--- a/tools/xl/xl_vmcontrol.c
+++ b/tools/xl/xl_vmcontrol.c
@@ -899,6 +899,8 @@ start:
         autoconnect_console_how = 0;
     }
 
+    d_config.c_info.domid = domid_policy;
+
     if ( restoring ) {
         libxl_domain_restore_params params;
 
-- 
2.20.1


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  parent reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-16  9:35 [Xen-devel] [PATCH v3 0/6] xl/libxl: domid allocation/preservation changes Paul Durrant
2020-01-16  9:35 ` [Xen-devel] [PATCH v3 1/6] libxl: add definition of INVALID_DOMID to the API Paul Durrant
2020-01-16  9:35 ` [Xen-devel] [PATCH v3 2/6] libxl_create: make 'soft reset' explicit Paul Durrant
2020-01-16  9:35 ` [Xen-devel] [PATCH v3 3/6] libxl: add infrastructure to track and query 'retired' domids Paul Durrant
2020-01-16 18:27   ` Ian Jackson
2020-01-17  9:26     ` Durrant, Paul
2020-01-17 11:31       ` Ian Jackson
2020-01-16  9:36 ` [Xen-devel] [PATCH v3 4/6] libxl: allow creation of domains with a specified or random domid Paul Durrant
2020-01-16  9:40   ` Jan Beulich
2020-01-16  9:46     ` Durrant, Paul
2020-01-16  9:59       ` Jan Beulich
2020-01-16 15:53   ` Jason Andryuk
2020-01-16 18:36   ` Ian Jackson
2020-01-17  9:37     ` Durrant, Paul
2020-01-17 11:35       ` Ian Jackson
2020-01-17 12:06         ` Durrant, Paul
2020-01-17 15:30           ` Ian Jackson
2020-01-20  8:18             ` Durrant, Paul
2020-01-16  9:36 ` Paul Durrant [this message]
2020-01-16 18:37   ` [Xen-devel] [PATCH v3 5/6] xl.conf: introduce 'domid_policy' Ian Jackson
2020-01-16  9:36 ` [Xen-devel] [PATCH v3 6/6] xl: allow domid to be preserved on save/restore or migrate Paul Durrant
2020-01-16 18:39   ` Ian Jackson
2020-01-16 18:43 ` [Xen-devel] [PATCH v3 0/6] xl/libxl: domid allocation/preservation changes Ian Jackson
2020-01-17  9:11   ` Durrant, Paul

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