iscsi: Pick default initiator-name based on the name of the VM

This patch updates the iscsi layer to automatically pick a 'unique'
initiator-name based on the name of the vm in case the user has not set
an explicit iqn-name to use.

Create a new function qemu_get_vm_name() that returns the name of the VM,
if specified.

This way we can thus create default names to use as the initiator name
based on the guest session.

If the VM is not named via the '-name' command line argument, the iscsi
initiator-name used wiull simply be

    iqn.2008-11.org.linux-kvm

If a name for the VM was specified with the '-name' option, iscsi will
use a default initiatorname of

    iqn.2008-11.org.linux-kvm:<name>

These names are just the default iscsi initiator name that qemu will
generate/use only when the user has not set an explicit initiator name
via the commandlines or config files.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>

6 files changed, 28 insertions, 1 deletions

diff --git a/block/iscsi.c b/block/iscsi.c
index fd954d4c1f..219f927823 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -896,6 +896,7 @@ static char *parse_initiator_name(const char *target)
     QemuOptsList *list;
     QemuOpts *opts;
     const char *name = NULL;
+    const char *iscsi_name = qemu_get_vm_name();
 
     list = qemu_find_opts("iscsi");
     if (list) {
@@ -911,7 +912,9 @@ static char *parse_initiator_name(const char *target)
     if (name) {
         return g_strdup(name);
     } else {
-        return g_strdup("iqn.2008-11.org.linux-kvm");
+        return g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s",
+                               iscsi_name ? ":" : "",
+                               iscsi_name ? iscsi_name : "");
     }
 }
 
diff --git a/qemu-common.h b/qemu-common.h
index f16079f432..f9deca6f86 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -376,6 +376,7 @@ bool buffer_is_zero(const void *buf, size_t len);
 void qemu_progress_init(int enabled, float min_skip);
 void qemu_progress_end(void);
 void qemu_progress_print(float delta, int max);
+const char *qemu_get_vm_name(void);
 
 #define QEMU_FILE_TYPE_BIOS   0
 #define QEMU_FILE_TYPE_KEYMAP 1
diff --git a/qemu-doc.texi b/qemu-doc.texi
index f32e9e2fb9..35cabbcb9e 100644
--- a/qemu-doc.texi
+++ b/qemu-doc.texi
@@ -734,6 +734,11 @@ Various session related parameters can be set via special options, either
 in a configuration file provided via '-readconfig' or directly on the
 command line.
 
+If the initiator-name is not specified qemu will use a default name
+of 'iqn.2008-11.org.linux-kvm[:<name>'] where <name> is the name of the
+virtual machine.
+
+
 @example
 Setting a specific initiator name to use when logging in to the target
 -iscsi initiator-name=iqn.qemu.test:my-initiator
diff --git a/qemu-options.hx b/qemu-options.hx
index 5e7d0dc035..47cb5bd311 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1897,6 +1897,11 @@ images for the guest storage. Both disk and cdrom images are supported.
 Syntax for specifying iSCSI LUNs is
 ``iscsi://<target-ip>[:<port>]/<target-iqn>/<lun>''
 
+By default qemu will use the iSCSI initiator-name
+'iqn.2008-11.org.linux-kvm[:<name>]' but this can also be set from the command
+line or a configuration file.
+
+
 Example (without authentication):
 @example
 qemu-system-i386 -iscsi initiator-name=iqn.2001-04.com.example:my-initiator \
@@ -1926,6 +1931,9 @@ DEF("iscsi", HAS_ARG, QEMU_OPTION_iscsi,
     "                iSCSI session parameters\n", QEMU_ARCH_ALL)
 STEXI
 
+iSCSI parameters such as username and password can also be specified via
+a configuration file. See qemu-doc for more information and examples.
+
 @item NBD
 QEMU supports NBD (Network Block Devices) both using TCP protocol as well
 as Unix Domain Sockets.
diff --git a/qemu-tool.c b/qemu-tool.c
index 318c5fcbca..64b5e88bc7 100644
--- a/qemu-tool.c
+++ b/qemu-tool.c
@@ -30,6 +30,11 @@ struct QEMUBH
     void *opaque;
 };
 
+const char *qemu_get_vm_name(void)
+{
+    return NULL;
+}
+
 Monitor *cur_mon;
 
 int monitor_cur_is_qmp(void)
diff --git a/vl.c b/vl.c
index e71cb30ecf..065aec290e 100644
--- a/vl.c
+++ b/vl.c
@@ -293,6 +293,11 @@ static struct {
     { .driver = "qxl-vga",              .flag = &default_vga       },
 };
 
+const char *qemu_get_vm_name(void)
+{
+    return qemu_name;
+}
+
 static void res_free(void)
 {
     if (boot_splash_filedata != NULL) {