[Xen-devel] [PATCH v2 2/3] xenstore: add console xenstore entries for xenstore stubdom

[Juergen Gross <jgross@xxxxxxxx>]

In order to be able to connect to the console of Xenstore stubdom we
need to create the appropriate entries in Xenstore.

For the moment we don't support xenconsoled living in another domain
than dom0, as this information isn't available other then via
Xenstore which we are just setting up.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 tools/helpers/init-xenstore-domain.c | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/tools/helpers/init-xenstore-domain.c 
b/tools/helpers/init-xenstore-domain.c
index 3a8ca64741..4ce8299c3c 100644
--- a/tools/helpers/init-xenstore-domain.c
+++ b/tools/helpers/init-xenstore-domain.c
@@ -12,6 +12,7 @@
 #include <xenstore.h>
 #include <xen/sys/xenbus_dev.h>
 #include <xen-xsm/flask/flask.h>
+#include <xen/io/xenbus.h>
 
 #include "init-dom-json.h"
 #include "_paths.h"
@@ -24,6 +25,7 @@ static char *param;
 static char *name = "Xenstore";
 static int memory;
 static int maxmem;
+static xen_pfn_t console_mfn;
 static xc_evtchn_port_or_error_t console_evtchn;
 
 static struct option options[] = {
@@ -223,6 +225,7 @@ static int build(xc_interface *xch)
     }
 
     rv = 0;
+    console_mfn = xc_dom_p2m(dom, dom->console_pfn);
 
 err:
     if ( dom )
@@ -321,6 +324,15 @@ static void do_xs_write(struct xs_handle *xsh, char *path, 
char *val)
         fprintf(stderr, "writing %s to xenstore failed.\n", path);
 }
 
+static void do_xs_write_dir_node(struct xs_handle *xsh, char *dir, char *node,
+                                 char *val)
+{
+    char full_path[100];
+
+    snprintf(full_path, 100, "%s/%s", dir, node);
+    do_xs_write(xsh, full_path, val);
+}
+
 static void do_xs_write_dom(struct xs_handle *xsh, char *path, char *val)
 {
     char full_path[64];
@@ -334,7 +346,7 @@ int main(int argc, char** argv)
     int opt;
     xc_interface *xch;
     struct xs_handle *xsh;
-    char buf[16];
+    char buf[16], be_path[64], fe_path[64];
     int rv, fd;
     char *maxmem_str = NULL;
 
@@ -423,6 +435,25 @@ int main(int argc, char** argv)
     if (maxmem)
         snprintf(buf, 16, "%d", maxmem * 1024);
     do_xs_write_dom(xsh, "memory/static-max", buf);
+    snprintf(be_path, 64, "/local/domain/0/backend/console/%d/0", domid);
+    snprintf(fe_path, 64, "/local/domain/%d/console", domid);
+    snprintf(buf, 16, "%d", domid);
+    do_xs_write_dir_node(xsh, be_path, "frontend-id", buf);
+    do_xs_write_dir_node(xsh, be_path, "frontend", fe_path);
+    do_xs_write_dir_node(xsh, be_path, "online", "1");
+    snprintf(buf, 16, "%d", XenbusStateInitialising);
+    do_xs_write_dir_node(xsh, be_path, "state", buf);
+    do_xs_write_dir_node(xsh, be_path, "protocol", "vt100");
+    do_xs_write_dir_node(xsh, fe_path, "backend", be_path);
+    do_xs_write_dir_node(xsh, fe_path, "backend-id", "0");
+    do_xs_write_dir_node(xsh, fe_path, "limit", "1048576");
+    do_xs_write_dir_node(xsh, fe_path, "type", "xenconsoled");
+    do_xs_write_dir_node(xsh, fe_path, "output", "pty");
+    do_xs_write_dir_node(xsh, fe_path, "tty", "");
+    snprintf(buf, 16, "%d", console_evtchn);
+    do_xs_write_dir_node(xsh, fe_path, "port", buf);
+    snprintf(buf, 16, "%ld", console_mfn);
+    do_xs_write_dir_node(xsh, fe_path, "ring-ref", buf);
     xs_close(xsh);
 
     fd = creat(XEN_RUN_DIR "/xenstored.pid", 0666);
-- 
2.16.4


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