hv: CAT is supposed to be enabled in the system level

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>

hypervisor/include/arch/x86/cat.h

@@ -9,8 +9,7 @@
 
 /* The intel Resource Director Tech(RDT) based Cache Allocation Tech support */
 struct cat_hw_info {
-	bool support;		/* If L2/L3 CAT supported */
-	bool enabled;		/* If any VM setup CLOS */
+	bool enabled;		/* If L2/L3 CAT enabled */
 	uint32_t bitmask;	/* Used by other entities */
 	uint16_t cbm_len;	/* Length of Cache mask in bits */
 	uint16_t clos_max;	/* Maximum CLOS supported, the number of cache masks */

hypervisor/include/arch/x86/vm_config.h

@@ -127,7 +127,9 @@ struct acrn_vm_config {
 	uint16_t pci_dev_num;				/* indicate how many PCI devices in VM */
 	struct acrn_vm_pci_dev_config *pci_devs;	/* point to PCI devices BDF list */
 	struct acrn_vm_os_config os_config;		/* OS information the VM */
-	uint16_t clos;					/* if guest_flags has GUEST_FLAG_CLOS_REQUIRED, then VM use this CLOS */
+	uint16_t clos;					/* Class of Service, effective only if CONFIG_CAT_ENABLED
+							 * is defined on CAT capable platforms
+							 */
 
 	struct vuart_config vuart[MAX_VUART_NUM_PER_VM];/* vuart configuration for VM */
 } __aligned(8);