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When enabling amx feature, we should call arch_prctl to request permission to use tile data for guest. The permission should be requested before the first vcpu is created, so we need to call arch_prctl in vmm thread. This patch adds the arch_prctl syscall for vmm_thread_rules. Fixes: #7516 Signed-off-by: Songqian Li <sionli@tencent.com>