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During vCPU creation, acquire vcpu->mutex prior to exposing the vCPU to userspace, and hold the mutex until online_vcpus is bumped, i.e. until the vCPU is fully online from KVM's perspective. To ensure asynchronous vCPU ioctls also wait for the vCPU to come online, explicitly check online_vcpus at the start of kvm_vcpu_ioctl(), and take the vCPU's mutex to wait if necessary (having to wait for any ioctl should be exceedingly rare, i.e. not worth optimizing). Reported-by: Will Deacon <will@kernel.org> Reported-by: Michal Luczaj <mhal@rbox.co> Link: https://lore.kernel.org/all/20240730155646.1687-1-will@kernel.org Acked-by: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20241009150455.1057573-4-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>