hv: sched: use hypervisor configuration to choose scheduler

For now, we set NOOP scheduler as default. User can choose IORR scheduler as needed.

Tracked-On: #4178
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/Makefile

@@ -211,8 +211,12 @@ HW_C_SRCS += arch/x86/cat.c
 HW_C_SRCS += arch/x86/sgx.c
 HW_C_SRCS += common/softirq.c
 HW_C_SRCS += common/schedule.c
+ifeq ($(CONFIG_SCHED_NOOP),y)
 HW_C_SRCS += common/sched_noop.c
+endif
+ifeq ($(CONFIG_SCHED_IORR),y)
 HW_C_SRCS += common/sched_iorr.c
+endif
 HW_C_SRCS += hw/pci.c
 HW_C_SRCS += arch/x86/configs/vm_config.c
 HW_C_SRCS += arch/x86/configs/$(CONFIG_BOARD)/board.c

hypervisor/arch/x86/Kconfig

@@ -37,6 +37,27 @@ config HYBRID
 
 endchoice
 
+choice
+	prompt "ACRN Scheduler"
+	default SCHED_NOOP
+	help
+	  Select the CPU scheduler to be used by the hypervisor
+
+config SCHED_NOOP
+	bool "NOOP scheduler"
+	help
+	  The NOOP (No-Operation) scheduler means there is a strict 1 to 1 mapping
+	  between vCPUs and pCPUs.
+
+config SCHED_IORR
+        bool "IORR scheduler"
+        help
+          IORR (IO sensitive Round Robin) scheduler supports multipule vCPUs running on
+	  on one pCPU, and they will be scheduled by a IO sensitive round robin policy.
+
+endchoice
+
+
 config BOARD
 	string "Target board"
 	help

hypervisor/common/schedule.c

@@ -73,7 +73,12 @@ void init_sched(uint16_t pcpu_id)
 	ctl->flags = 0UL;
 	ctl->curr_obj = NULL;
 	ctl->pcpu_id = pcpu_id;
+#ifdef CONFIG_SCHED_NOOP
 	ctl->scheduler = &sched_noop;
+#endif
+#ifdef CONFIG_SCHED_IORR
+	ctl->scheduler = &sched_iorr;
+#endif
 	if (ctl->scheduler->init != NULL) {
 		ctl->scheduler->init(ctl);
 	}