As stated in linux/Documentation/virtual/kvm/api.txt:
The maximum possible value for max_vcpu_id can be retrieved using the
KVM_CAP_MAX_VCPU_ID of the KVM_CHECK_EXTENSION ioctl() at run-time.
If the KVM_CAP_MAX_VCPU_ID does not exist, you should assume that
max_vcpu_id is the same as the value returned from KVM_CAP_MAX_VCPUS.
Signed-off-by: Greg Kurz <gk...@linux.vnet.ibm.com>
---
kvm-all.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/kvm-all.c b/kvm-all.c
index e56f38527815..e74e0c6e2352 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1459,10 +1459,16 @@ static int kvm_max_vcpus(KVMState *s)
return (ret) ? ret : kvm_recommended_vcpus(s);
}
+static int kvm_max_vcpu_id(KVMState *s)
+{
+ int ret = kvm_check_extension(s, KVM_CAP_MAX_VCPU_ID);
+ return (ret) ? ret : kvm_max_vcpus(s);
+}
+
bool kvm_vcpu_id_is_valid(int vcpu_id)
{
KVMState *s = KVM_STATE(current_machine->accelerator);
- return vcpu_id >= 0 && vcpu_id < kvm_max_vcpus(s);
+ return vcpu_id >= 0 && vcpu_id < kvm_max_vcpu_id(s);
}
static int kvm_init(MachineState *ms)
