Allocate x86's per-VM TSS at creation of a non-barebones VM. Like the GDT, the TSS is needed to actually run vCPUs, i.e. every non-barebones VM is all but guaranteed to allocate the TSS sooner or later. Reviewed-by: Ackerley Tng <ackerleytng@google.com> Link: https://lore.kernel.org/r/20240314232637.2538648-16-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>