From 5fbe336ba7f9dd12f9eeafec136b15a4f6e02807 Mon Sep 17 00:00:00 2001
From: "Daniel P. Berrange" <berrange@redhat.com>
Date: Wed, 17 May 2017 12:42:07 +0200
Subject: [PATCH 17/27] migration: setup bi-directional I/O channel for exec:
 protocol

RH-Author: Daniel P. Berrange <berrange@redhat.com>
Message-id: <20170517124207.14063-1-berrange@redhat.com>
Patchwork-id: 75260
O-Subject: [RHEL-7.4 qemu-kvm-rhev PATCH] migration: setup bi-directional I/O channel for exec: protocol
Bugzilla: 1430620
RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
RH-Acked-by: Juan Quintela <quintela@redhat.com>
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>

Historically the migration data channel has only needed to be
unidirectional. Thus the 'exec:' protocol was requesting an
I/O channel with O_RDONLY on incoming side, and O_WRONLY on
the outgoing side.

This is fine for classic migration, but if you then try to run
TLS over it, this fails because the TLS handshake requires a
bi-directional channel.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
(cherry picked from commit 062d81f0e968fe1597474735f3ea038065027372)
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 migration/exec.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/migration/exec.c b/migration/exec.c
index 9157721..aba9089 100644
--- a/migration/exec.c
+++ b/migration/exec.c
@@ -32,7 +32,7 @@ void exec_start_outgoing_migration(MigrationState *s, const char *command, Error
 
     trace_migration_exec_outgoing(command);
     ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
-                                                    O_WRONLY,
+                                                    O_RDWR,
                                                     errp));
     if (!ioc) {
         return;
@@ -59,7 +59,7 @@ void exec_start_incoming_migration(const char *command, Error **errp)
 
     trace_migration_exec_incoming(command);
     ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
-                                                    O_RDONLY,
+                                                    O_RDWR,
                                                     errp));
     if (!ioc) {
         return;
-- 
1.8.3.1