hv: implement NEED_SHUTDOWN_VM request to idle thread

For pre-launched VMs and SOS, VM shutdown should not be executed in the
current VM context.

- implement NEED_SHUTDOWN_VM request so that the BSP of the target VM can shut
  down the guest in idle thread.
- implement shutdown_vm_from_idle() to shut down target VM.

Tracked-On: #2700
Signed-off-by: Zide Chen <zide.chen@intel.com>
Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/Makefile

@@ -213,6 +213,7 @@ C_SRCS += arch/x86/guest/vmcs.c
 C_SRCS += arch/x86/guest/vmexit.c
 S_SRCS += arch/x86/guest/vmx_asm.S
 C_SRCS += arch/x86/guest/trusty.c
+C_SRCS += arch/x86/guest/vm_reset.c
 C_SRCS += arch/x86/cat.c
 C_SRCS += arch/x86/lib/memory.c
 C_SRCS += lib/string.c

hypervisor/arch/x86/guest/vm_reset.c

@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2019 Intel Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <vm.h>
+#include <vm_reset.h>
+#include <per_cpu.h>
+
+void shutdown_vm_from_idle(uint16_t pcpu_id)
+{
+	struct acrn_vm *vm = get_vm_from_vmid(per_cpu(shutdown_vm_id, pcpu_id));
+	const struct acrn_vcpu *vcpu = vcpu_from_vid(vm, BOOT_CPU_ID);
+
+	if (vcpu->pcpu_id == pcpu_id) {
+		(void)shutdown_vm(vm);
+	}
+}

hypervisor/common/hv_main.c

@@ -5,6 +5,7 @@
  */
 
 #include <vm.h>
+#include <vm_reset.h>
 #include <vmcs.h>
 #include <vmexit.h>
 #include <irq.h>
@@ -88,6 +89,8 @@ void default_idle(__unused struct sched_object *obj)
 			schedule();
 		} else if (need_offline(pcpu_id) != 0) {
 			cpu_dead();
+		} else if (need_shutdown_vm(pcpu_id)) {
+			shutdown_vm_from_idle(pcpu_id);
 		} else {
 			CPU_IRQ_ENABLE();
 			cpu_do_idle();

hypervisor/common/schedule.c

@@ -152,6 +152,23 @@ int32_t need_offline(uint16_t pcpu_id)
 	return bitmap_test_and_clear_lock(NEED_OFFLINE, &ctx->flags);
 }
 
+void make_shutdown_vm_request(uint16_t pcpu_id)
+{
+	struct sched_context *ctx = &per_cpu(sched_ctx, pcpu_id);
+
+	bitmap_set_lock(NEED_SHUTDOWN_VM, &ctx->flags);
+	if (get_pcpu_id() != pcpu_id) {
+		send_single_ipi(pcpu_id, VECTOR_NOTIFY_VCPU);
+	}
+}
+
+bool need_shutdown_vm(uint16_t pcpu_id)
+{
+	struct sched_context *ctx = &per_cpu(sched_ctx, pcpu_id);
+
+	return bitmap_test_and_clear_lock(NEED_SHUTDOWN_VM, &ctx->flags);
+}
+
 static void prepare_switch(struct sched_object *prev, struct sched_object *next)
 {
 	if ((prev != NULL) && (prev->prepare_switch_out != NULL)) {

hypervisor/include/arch/x86/guest/vm_reset.h

@@ -0,0 +1,12 @@
+/*
+ * Copyright (C) 2019 Intel Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef VM_RESET_H_
+#define VM_RESET_H_
+
+void shutdown_vm_from_idle(uint16_t pcpu_id);
+
+#endif /* VM_RESET_H_ */

hypervisor/include/arch/x86/per_cpu.h

@@ -18,6 +18,7 @@
 #include <gdt.h>
 #include <schedule.h>
 #include <security.h>
+#include <vm_config.h>
 
 struct per_cpu_region {
 	/* vmxon_region MUST be 4KB-aligned */
@@ -52,6 +53,7 @@ struct per_cpu_region {
 #ifdef PROFILING_ON
 	struct profiling_info_wrapper profiling_info;
 #endif
+	uint16_t shutdown_vm_id;
 } __aligned(PAGE_SIZE); /* per_cpu_region size aligned with PAGE_SIZE */
 
 extern struct per_cpu_region per_cpu_data[CONFIG_MAX_PCPU_NUM];

hypervisor/include/common/schedule.h

@@ -10,6 +10,7 @@
 
 #define	NEED_RESCHEDULE		(1U)
 #define	NEED_OFFLINE		(2U)
+#define	NEED_SHUTDOWN_VM	(3U)
 
 #define DEL_MODE_INIT		(1U)
 #define DEL_MODE_IPI		(2U)
@@ -50,6 +51,8 @@ void make_reschedule_request(uint16_t pcpu_id, uint16_t delmode);
 bool need_reschedule(uint16_t pcpu_id);
 void make_pcpu_offline(uint16_t pcpu_id);
 int32_t need_offline(uint16_t pcpu_id);
+void make_shutdown_vm_request(uint16_t pcpu_id);
+bool need_shutdown_vm(uint16_t pcpu_id);
 
 void schedule(void);
 void run_sched_thread(struct sched_object *obj);