[PATCH v2 13/24] kvm: Set up signal mask also for !CONFIG_IOTHREAD

[Jan Kiszka <jan.kiszka@xxxxxx>]

From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>

Block SIG_IPI, unblock it during KVM_RUN, just like in io-thread mode.
It's unused so far, but this infrastructure will be required for
self-IPIs and to process SIGBUS plus, in KVM mode, SIGIO and SIGALRM. As
Windows doesn't support signal services, we need to provide a stub for
the init function.

Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
---
 cpus.c |   29 +++++++++++++++++++++++++++--
 1 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/cpus.c b/cpus.c
index 42717ba..a33e470 100644
--- a/cpus.c
+++ b/cpus.c
@@ -231,11 +231,9 @@ fail:
     return err;
 }
 
-#ifdef CONFIG_IOTHREAD
 static void dummy_signal(int sig)
 {
 }
-#endif
 
 #else /* _WIN32 */
 
@@ -267,6 +265,32 @@ static void qemu_event_increment(void)
 #endif /* _WIN32 */
 
 #ifndef CONFIG_IOTHREAD
+static void qemu_kvm_init_cpu_signals(CPUState *env)
+{
+#ifndef _WIN32
+    int r;
+    sigset_t set;
+    struct sigaction sigact;
+
+    memset(&sigact, 0, sizeof(sigact));
+    sigact.sa_handler = dummy_signal;
+    sigaction(SIG_IPI, &sigact, NULL);
+
+    sigemptyset(&set);
+    sigaddset(&set, SIG_IPI);
+    pthread_sigmask(SIG_BLOCK, &set, NULL);
+
+    pthread_sigmask(SIG_BLOCK, NULL, &set);
+    sigdelset(&set, SIG_IPI);
+    sigdelset(&set, SIGBUS);
+    r = kvm_set_signal_mask(env, &set);
+    if (r) {
+        fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
+        exit(1);
+    }
+#endif
+}
+
 int qemu_init_main_loop(void)
 {
     cpu_set_debug_excp_handler(cpu_debug_handler);
@@ -292,6 +316,7 @@ void qemu_init_vcpu(void *_env)
             fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
             exit(1);
         }
+        qemu_kvm_init_cpu_signals(env);
     }
 }
 
-- 
1.7.1

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