cpus: reorganize signal handling code

Move the KVM "eat signals" code under CONFIG_LINUX, in preparation
for moving it to kvm-all.c; reraise non-MCE SIGBUS immediately,
without passing it to KVM.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 32 insertions, 31 deletions

diff --git a/cpus.c b/cpus.c
index a628cde..399e271 100644
--- a/cpus.c
+++ b/cpus.c
@@ -922,6 +922,10 @@ static void sigbus_reraise(void)
 
 static void sigbus_handler(int n, siginfo_t *siginfo, void *ctx)
 {
+    if (siginfo->si_code != BUS_MCEERR_AO && siginfo->si_code != BUS_MCEERR_AR) {
+        sigbus_reraise();
+    }
+
     if (kvm_on_sigbus(siginfo->si_code, siginfo->si_addr)) {
         sigbus_reraise();
     }
@@ -939,6 +943,30 @@ static void qemu_init_sigbus(void)
     prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0);
 }
 
+static void dummy_signal(int sig)
+{
+}
+
+static void qemu_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);
+    sigdelset(&set, SIG_IPI);
+    sigdelset(&set, SIGBUS);
+    r = kvm_set_signal_mask(cpu, &set);
+    if (r) {
+        fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
+        exit(1);
+    }
+}
+
 static void qemu_kvm_eat_signals(CPUState *cpu)
 {
     struct timespec ts = { 0, 0 };
@@ -960,6 +988,9 @@ static void qemu_kvm_eat_signals(CPUState *cpu)
 
         switch (r) {
         case SIGBUS:
+            if (siginfo.si_code != BUS_MCEERR_AO && siginfo.si_code != BUS_MCEERR_AR) {
+                sigbus_reraise();
+            }
             if (kvm_on_sigbus_vcpu(cpu, siginfo.si_code, siginfo.si_addr)) {
                 sigbus_reraise();
             }
@@ -975,9 +1006,7 @@ static void qemu_kvm_eat_signals(CPUState *cpu)
         }
     } while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS));
 }
-
 #else /* !CONFIG_LINUX */
-
 static void qemu_init_sigbus(void)
 {
 }
@@ -985,39 +1014,11 @@ static void qemu_init_sigbus(void)
 static void qemu_kvm_eat_signals(CPUState *cpu)
 {
 }
-#endif /* !CONFIG_LINUX */
-
-#ifndef _WIN32
-static void dummy_signal(int sig)
-{
-}
-
-static void qemu_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);
-    sigdelset(&set, SIG_IPI);
-    sigdelset(&set, SIGBUS);
-    r = kvm_set_signal_mask(cpu, &set);
-    if (r) {
-        fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
-        exit(1);
-    }
-}
 
-#else /* _WIN32 */
 static void qemu_kvm_init_cpu_signals(CPUState *cpu)
 {
-    abort();
 }
-#endif /* _WIN32 */
+#endif /* !CONFIG_LINUX */
 
 static QemuMutex qemu_global_mutex;