[PATCH] Disallow colons in the parameter of "-accel"

[Thomas Huth <thuth@redhat.com>]

Everybody who used something like "-machine accel=kvm:tcg" in the past
might be tempted to specify a similar list with the -accel parameter,
too, for example "-accel kvm:tcg". However, this is not how this
options is thought to be used, since each "-accel" should only take care
of one specific accelerator.

In the long run, we really should rework the "-accel" code completely,
so that it does not set "-machine accel=..." anymore internally, but
is completely independent from "-machine". For the short run, let's
make sure that users cannot use "-accel xyz:tcg", so that we avoid
that we have to deal with such cases in the wild later.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 vl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/vl.c b/vl.c
index 630f5c5e9c..68f47a9c25 100644
--- a/vl.c
+++ b/vl.c
@@ -3554,6 +3554,11 @@ int main(int argc, char **argv, char **envp)
                     g_slist_free(accel_list);
                     exit(0);
                 }
+                if (optarg && strchr(optarg, ':')) {
+                    error_report("Don't use ':' with -accel, "
+                                 "use -M accel=... in this case instead");
+                    exit(1);
+                }
                 opts = qemu_opts_create(qemu_find_opts("machine"), NULL,
                                         false, &error_abort);
                 qemu_opt_set(opts, "accel", optarg, &error_abort);
-- 
2.18.1