[PATCH 1/3] kvm tools: add signal placeholder to avoid balloon crash

[Liming Wang <walimisdev@gmail.com>]

If "kvm run" without balloon option, use "kvm balloon" may
crash kvm. Add signal placeholder to avoid this.

Signed-off-by: Liming Wang <walimisdev@gmail.com>
---
 tools/kvm/builtin-run.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/tools/kvm/builtin-run.c b/tools/kvm/builtin-run.c
index fa5de27..d725834 100644
--- a/tools/kvm/builtin-run.c
+++ b/tools/kvm/builtin-run.c
@@ -280,6 +280,10 @@ static void handle_sigstop(int sig)
 	kvm_cpu__reboot();
 }
 
+static void handle_empty(int sig)
+{
+}
+
 static void *kvm_cpu_thread(void *arg)
 {
 	current_kvm_cpu		= arg;
@@ -469,6 +473,9 @@ int kvm_cmd_run(int argc, const char **argv, const char *prefix)
 	signal(SIGUSR2, handle_sigusr2);
 	signal(SIGKVMSTOP, handle_sigstop);
 	signal(SIGKVMRESUME, handle_sigusr2);
+	/* signal placeholder if not enable balloon */
+	signal(SIGKVMADDMEM, handle_empty);
+	signal(SIGKVMDELMEM, handle_empty);
 
 	nr_online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
 
-- 
1.7.0.4