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In platforms that support CAT, when it is enabled by ACRN, i.e. IA32_resourceType_MASK_n registers are programmed with customized values, it has impacts to the whole system. The per guest flag GUEST_FLAG_CLOS_REQUIRED suggests that CAT may be enabled in some guests, but not in others who don't have this flag, which is conceptually incorrect. This patch removes GUEST_FLAG_CLOS_REQUIRED, and adds a new Kconfig entry CAT_ENABLED for CAT enabling. When it's enabled, platform_clos_array[] defines a set of system-wide Class of Service (COS, or CLOS), and the per guest vm_configs[].clos associates the guest with particular CLOS. Tracked-On: #2462 Signed-off-by: Zide Chen <zide.chen@intel.com>