KVM: Move check for existing vCPU ID to the top of vCPU creation

Now that kvm->lock is held for the entirety of vCPU creation, check for a
conflicting vCPU ID at the begnning of vCPU creation, before the arch
precreate() hook is invoked.  This will allow reverting commit 97d65b544f48
("KVM: Check for duplicate vcpu_id as early as possible").  For now, keep
the redundant vcpu_ids tracking as a sanity check.

No functional change intended (absent KVM bugs, checking vcpu_ids and
walking kvm_get_vcpu_by_id() should yield the same result).

Signed-off-by: Sean Christopherson <seanjc@google.com>
Tested-by: Jean-Christophe Guillain <jean-christophe@guillain.net>
Tested-by: Naveen N Rao (AMD) <naveen@kernel.org>
Message-ID: <20260921174445.911676-6-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

0 files changed, 0 insertions, 0 deletions