apicv: cancel event injection if vcpu is scheduled out

And re-inject the event after vcpu is scheduled in.

Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>

Author: fyin1

hypervisor/arch/x86/interrupt.c

@@ -293,6 +293,18 @@ int acrn_do_intr_process(struct vcpu *vcpu)
 	if (bitmap_test_and_clear(ACRN_REQUEST_TMR_UPDATE, pending_intr_bits))
 		vioapic_update_tmr(vcpu);
 
+	/* handling cancelled event injection when vcpu is switched out */
+	if (vcpu->arch_vcpu.inject_event_pending) {
+		exec_vmwrite(VMX_ENTRY_EXCEPTION_EC,
+			vcpu->arch_vcpu.inject_info.error_code);
+
+		exec_vmwrite(VMX_ENTRY_INT_INFO_FIELD,
+			vcpu->arch_vcpu.inject_info.intr_info);
+
+		vcpu->arch_vcpu.inject_event_pending = false;
+		goto INTR_WIN;
+	}
+
 	/* handling pending vector injection:
 	 * there are many reason inject failed, we need re-inject again
 	 */
@@ -380,6 +392,30 @@ int acrn_do_intr_process(struct vcpu *vcpu)
 	return ret;
 }
 
+void cancel_event_injection(struct vcpu *vcpu)
+{
+	uint32_t intinfo;
+
+	intinfo = exec_vmread(VMX_ENTRY_INT_INFO_FIELD);
+
+	/*
+	 * If event is injected, we clear VMX_ENTRY_INT_INFO_FIELD,
+	 * save injection info, and mark inject event pending.
+	 * The event will be re-injected in next acrn_do_intr_process
+	 * call.
+	 */
+	if (intinfo & VMX_INT_INFO_VALID) {
+		vcpu->arch_vcpu.inject_event_pending = true;
+
+		if (intinfo & (EXCEPTION_ERROR_CODE_VALID << 8))
+			vcpu->arch_vcpu.inject_info.error_code =
+				exec_vmread(VMX_ENTRY_EXCEPTION_EC);
+
+		vcpu->arch_vcpu.inject_info.intr_info = intinfo;
+		exec_vmwrite(VMX_ENTRY_INT_INFO_FIELD, 0);
+	}
+}
+
 int exception_handler(struct vcpu *vcpu)
 {
 	uint32_t intinfo, int_err_code;

hypervisor/common/schedule.c

@@ -147,6 +147,9 @@ static void context_switch_out(struct vcpu *vcpu)
 	if (vcpu == NULL)
 		return;
 
+	/* cancel event(int, gp, nmi and exception) injection */
+	cancel_event_injection(vcpu);
+
 	atomic_store_rel_32(&vcpu->running, 0);
 	/* do prev vcpu context switch out */
 	/* For now, we don't need to invalid ept.

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

@@ -185,6 +185,11 @@ struct run_context {
 #define NORMAL_WORLD	0
 #define SECURE_WORLD	1
 
+struct event_injection_info {
+	uint32_t intr_info;
+	uint32_t error_code;
+};
+
 struct vcpu_arch {
 	int cur_context;
 	struct run_context contexts[NR_WORLD];
@@ -221,6 +226,8 @@ struct vcpu_arch {
 
 	/* interrupt injection information */
 	uint64_t pending_intr;
+	bool inject_event_pending;
+	struct event_injection_info inject_info;
 
 	/* per vcpu lapic */
 	void *vlapic;

hypervisor/include/arch/x86/irq.h

@@ -161,4 +161,6 @@ int interrupt_win_exiting_handler(struct vcpu *vcpu);
 int external_interrupt_handler(struct vcpu *vcpu);
 int acrn_do_intr_process(struct vcpu *vcpu);
 int interrupt_init(uint32_t logical_id);
+
+void cancel_event_injection(struct vcpu *vcpu);
 #endif /* IRQ_H */