1 files changed, 55 insertions, 5 deletions

diff --git a/kvm-all.c b/kvm-all.c
index 0baa193763..1d7fc6c1e8 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1899,6 +1899,32 @@ static __thread int pending_sigbus_code;
 static __thread bool have_sigbus_pending;
 #endif
 
+static void kvm_eat_signals(CPUState *cpu)
+{
+    struct timespec ts = { 0, 0 };
+    siginfo_t siginfo;
+    sigset_t waitset;
+    sigset_t chkset;
+    int r;
+
+    sigemptyset(&waitset);
+    sigaddset(&waitset, SIG_IPI);
+
+    do {
+        r = sigtimedwait(&waitset, &siginfo, &ts);
+        if (r == -1 && !(errno == EAGAIN || errno == EINTR)) {
+            perror("sigtimedwait");
+            exit(1);
+        }
+
+        r = sigpending(&chkset);
+        if (r == -1) {
+            perror("sigpending");
+            exit(1);
+        }
+    } while (sigismember(&chkset, SIG_IPI));
+}
+
 int kvm_cpu_exec(CPUState *cpu)
 {
     struct kvm_run *run = cpu->kvm_run;
@@ -1949,6 +1975,7 @@ int kvm_cpu_exec(CPUState *cpu)
         if (run_ret < 0) {
             if (run_ret == -EINTR || run_ret == -EAGAIN) {
                 DPRINTF("io window exit\n");
+                kvm_eat_signals(cpu);
                 ret = EXCP_INTERRUPT;
                 break;
             }
@@ -2388,16 +2415,12 @@ void kvm_remove_all_breakpoints(CPUState *cpu)
 }
 #endif /* !KVM_CAP_SET_GUEST_DEBUG */
 
-int kvm_set_signal_mask(CPUState *cpu, const sigset_t *sigset)
+static int kvm_set_signal_mask(CPUState *cpu, const sigset_t *sigset)
 {
     KVMState *s = kvm_state;
     struct kvm_signal_mask *sigmask;
     int r;
 
-    if (!sigset) {
-        return kvm_vcpu_ioctl(cpu, KVM_SET_SIGNAL_MASK, NULL);
-    }
-
     sigmask = g_malloc(sizeof(*sigmask) + sizeof(*sigset));
 
     sigmask->len = s->sigmask_len;
@@ -2408,6 +2431,33 @@ int kvm_set_signal_mask(CPUState *cpu, const sigset_t *sigset)
     return r;
 }
 
+static void dummy_signal(int sig)
+{
+}
+
+void kvm_init_cpu_signals(CPUState *cpu)
+{
+    int r;
+    sigset_t set;
+    struct sigaction sigact;
+
+    memset(&sigact, 0, sizeof(sigact));
+    sigact.sa_handler = dummy_signal;
+    sigaction(SIG_IPI, &sigact, NULL);
+
+    pthread_sigmask(SIG_BLOCK, NULL, &set);
+#if defined KVM_HAVE_MCE_INJECTION
+    sigdelset(&set, SIGBUS);
+    pthread_sigmask(SIG_SETMASK, &set, NULL);
+#endif
+    sigdelset(&set, SIG_IPI);
+    r = kvm_set_signal_mask(cpu, &set);
+    if (r) {
+        fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
+        exit(1);
+    }
+}
+
 /* Called asynchronously in VCPU thread.  */
 int kvm_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
 {