The x86 kvm kernel module limits guest cpu count to 16, but theuserspace pc definition says 255 still, so kvm_create_vcpu will fail for that reason with -smp > 16 specified. This patch causes qemu-kvm to exit in that case. Without this patch other errors get reported down the road and finally a segfault occurs.
Bruce
Signed-off-by: Bruce Rogers <brogers@xxxxxxxxxx>
diff --git a/qemu/qemu-kvm.c b/qemu/qemu-kvm.c
index ed76367..b6d6d5e 100644
--- a/qemu/qemu-kvm.c
+++ b/qemu/qemu-kvm.c
@@ -417,12 +417,18 @@ static void *ap_main_loop(void *_env)
CPUState *env = _env;
sigset_t signals;
struct ioperm_data *data = NULL;
+ int r;
current_env = env;
env->thread_id = kvm_get_thread_id();
sigfillset(&signals);
sigprocmask(SIG_BLOCK, &signals, NULL);
- kvm_create_vcpu(kvm_context, env->cpu_index);
+ r = kvm_create_vcpu(kvm_context, env->cpu_index);
+ if (r)
+ {
+ fprintf(stderr, "error creating vcpu: %d\n", r);
+ exit(1);
+ }
kvm_qemu_init_env(env);
#ifdef USE_KVM_DEVICE_ASSIGNMENT
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