[PATCH][RESEND] Add kvm_set_boot_cpu_id() API.

[Gleb Natapov <gleb@redhat.com>]

Old kernel assumed that apic id of a boot cpus is zero, recent kernels
have an IOCTL to configure BSP's apic id. The patch adds API function to
use this capability. The BSP apic id is set to zero (now explicitly)
since QEMU/BIOS not ready yet to take full advantage of the new API.

diff --git a/hw/pc.c b/hw/pc.c
index 43e2f29..cf84416 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -1131,6 +1131,7 @@ static void pc_init1(ram_addr_t ram_size,
 #endif
     }
 
+    kvm_set_boot_cpu_id(0);
     for (i = 0; i < smp_cpus; i++) {
         env = pc_new_cpu(cpu_model);
     }
diff --git a/qemu-kvm.c b/qemu-kvm.c
index c5cd038..c57df57 100644
--- a/qemu-kvm.c
+++ b/qemu-kvm.c
@@ -441,6 +441,18 @@ err:
 	return NULL;
 }
 
+static int kvm_set_boot_vcpu_id(kvm_context_t kvm, uint32_t id)
+{
+#ifdef KVM_CAP_SET_BOOT_CPU_ID
+    int r = ioctl(kvm->fd, KVM_CHECK_EXTENSION, KVM_CAP_SET_BOOT_CPU_ID);
+    if (r > 0)
+        return ioctl(kvm->vm_fd, KVM_SET_BOOT_CPU_ID, id);
+    return -ENOSYS;
+#else
+    return -ENOSYS;
+#endif
+}
+
 int kvm_create_vm(kvm_context_t kvm)
 {
 	int fd = kvm->fd;
@@ -2923,3 +2935,8 @@ void qemu_kvm_cpu_stop(CPUState *env)
     if (kvm_enabled())
         env->kvm_cpu_state.stopped = 1;
 }
+
+int kvm_set_boot_cpu_id(uint32_t id)
+{
+	return kvm_set_boot_vcpu_id(kvm_context, id);
+}
diff --git a/qemu-kvm.h b/qemu-kvm.h
index eb99bc4..ce22bed 100644
--- a/qemu-kvm.h
+++ b/qemu-kvm.h
@@ -80,6 +80,7 @@ int kvm_arch_try_push_interrupts(void *opaque);
 void kvm_arch_push_nmi(void *opaque);
 void kvm_arch_update_regs_for_sipi(CPUState *env);
 void kvm_arch_cpu_reset(CPUState *env);
+int kvm_set_boot_cpu_id(uint32_t id);
 
 struct kvm_guest_debug;
 struct kvm_debug_exit_arch;
--
			Gleb.