[PATCH RFC v1 13/13] xenconsole: try to attach to PV console if HVM fails

[Roger Pau Monne <roger.pau@citrix.com>]

HVM guests have always used the emulated serial console by default, but if
the emulated serial pty cannot be fetched from xenstore try to use the PV
console instead.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Elena Ufimtseva <elena.ufimtseva@oracle.com>
---
 tools/console/client/main.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/tools/console/client/main.c b/tools/console/client/main.c
index f4c783b..c92553e 100644
--- a/tools/console/client/main.c
+++ b/tools/console/client/main.c
@@ -279,7 +279,7 @@ int main(int argc, char **argv)
 		{ 0 },
 
 	};
-	char *dom_path = NULL, *path = NULL;
+	char *dom_path = NULL, *path = NULL, *test = NULL;
 	int spty, xsfd;
 	struct xs_handle *xs;
 	char *end;
@@ -357,9 +357,14 @@ int main(int argc, char **argv)
 	path = malloc(strlen(dom_path) + strlen("/device/console/0/tty") + 5);
 	if (path == NULL)
 		err(ENOMEM, "malloc");
-	if (type == CONSOLE_SERIAL)
+	if (type == CONSOLE_SERIAL) {
 		snprintf(path, strlen(dom_path) + strlen("/serial/0/tty") + 5, "%s/serial/%d/tty", dom_path, num);
-	else {
+		test = xs_read(xs, XBT_NULL, path, NULL);
+		free(test);
+		if (test == NULL)
+			goto pv_console;
+	} else {
+pv_console:
 		if (num == 0)
 			snprintf(path, strlen(dom_path) + strlen("/console/tty") + 1, "%s/console/tty", dom_path);
 		else
-- 
1.9.5 (Apple Git-50.3)


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