From: Sasha Levin <levinsasha928@gmail.com>
Date: Mon, 30 May 2011 17:27:54 +0000 (+0300)
Subject: kvm tools: Pause/resume guest using SIGUSR2
X-Git-Tag: next-20110824~3^2~241
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1c5ee6cab07829f0ed9adf70b7fccb0b0dc7423a;p=karo-tx-linux.git

kvm tools: Pause/resume guest using SIGUSR2

Make SIGUSR2 pause/resume a guest, this allows to easily test
pausing a guest.
Can be tested using cmdline 'kill -USR2 $(pidof kvm)'.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---

diff --git a/tools/kvm/kvm-run.c b/tools/kvm/kvm-run.c
index 761ac0d3548d..b0ef33388584 100644
--- a/tools/kvm/kvm-run.c
+++ b/tools/kvm/kvm-run.c
@@ -165,6 +165,20 @@ static void handle_sigusr1(int sig)
 	mb();
 }
 
+/* Pause/resume the guest using SIGUSR2 */
+static int is_paused;
+
+static void handle_sigusr2(int sig)
+{
+	if (is_paused)
+		kvm__continue();
+	else
+		kvm__pause();
+
+	is_paused = !is_paused;
+	pr_info("Guest %s\n", is_paused ? "paused" : "resumed");
+}
+
 static void handle_sigquit(int sig)
 {
 	int i;
@@ -422,6 +436,7 @@ int kvm_cmd_run(int argc, const char **argv, const char *prefix)
 	signal(SIGALRM, handle_sigalrm);
 	signal(SIGQUIT, handle_sigquit);
 	signal(SIGUSR1, handle_sigusr1);
+	signal(SIGUSR2, handle_sigusr2);
 
 	nr_online_cpus = sysconf(_SC_NPROCESSORS_ONLN);