hv: Add vlapic_has_pending_intr of apicv to check pending interrupts

Sometimes HV wants to know if there are pending interrupts of one vcpu.
Add .has_pending_intr interface in acrn_apicv_ops and return the pending
interrupts status by check IRRs of apicv.

Tracked-On: #4329
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

Author: Shuo A Liu

hypervisor/arch/x86/guest/vlapic.c

@@ -1755,6 +1755,11 @@ static bool ptapic_has_pending_delivery_intr(__unused struct acrn_vcpu *vcpu)
 	return false;
 }
 
+static bool ptapic_has_pending_intr(__unused struct acrn_vcpu *vcpu)
+{
+	return false;
+}
+
 static bool ptapic_invalid(__unused uint32_t offset)
 {
 	return false;
@@ -1764,6 +1769,7 @@ static const struct acrn_apicv_ops ptapic_ops = {
 	.accept_intr = ptapic_accept_intr,
 	.inject_intr = ptapic_inject_intr,
 	.has_pending_delivery_intr = ptapic_has_pending_delivery_intr,
+	.has_pending_intr = ptapic_has_pending_intr,
 	.apic_read_access_may_valid  = ptapic_invalid,
 	.apic_write_access_may_valid  = ptapic_invalid,
 	.x2apic_read_msr_may_valid  = ptapic_invalid,
@@ -2390,6 +2396,27 @@ bool vlapic_has_pending_delivery_intr(struct acrn_vcpu *vcpu)
 	return vlapic->ops->has_pending_delivery_intr(vcpu);
 }
 
+static bool apicv_basic_has_pending_intr(struct acrn_vcpu *vcpu)
+{
+	struct acrn_vlapic *vlapic = vcpu_vlapic(vcpu);
+	uint32_t vector;
+
+	vector = vlapic_find_highest_irr(vlapic);
+
+	return vector != 0UL;
+}
+
+static bool apicv_advanced_has_pending_intr(struct acrn_vcpu *vcpu)
+{
+	return apicv_basic_has_pending_intr(vcpu);
+}
+
+bool vlapic_has_pending_intr(struct acrn_vcpu *vcpu)
+{
+	struct acrn_vlapic *vlapic = vcpu_vlapic(vcpu);
+	return vlapic->ops->has_pending_intr(vcpu);
+}
+
 static bool apicv_basic_apic_read_access_may_valid(__unused uint32_t offset)
 {
 	return true;
@@ -2603,6 +2630,7 @@ static const struct acrn_apicv_ops apicv_basic_ops = {
 	.accept_intr = apicv_basic_accept_intr,
 	.inject_intr = apicv_basic_inject_intr,
 	.has_pending_delivery_intr = apicv_basic_has_pending_delivery_intr,
+	.has_pending_intr = apicv_basic_has_pending_intr,
 	.apic_read_access_may_valid = apicv_basic_apic_read_access_may_valid,
 	.apic_write_access_may_valid = apicv_basic_apic_write_access_may_valid,
 	.x2apic_read_msr_may_valid = apicv_basic_x2apic_read_msr_may_valid,
@@ -2613,6 +2641,7 @@ static const struct acrn_apicv_ops apicv_advanced_ops = {
 	.accept_intr = apicv_advanced_accept_intr,
 	.inject_intr = apicv_advanced_inject_intr,
 	.has_pending_delivery_intr = apicv_advanced_has_pending_delivery_intr,
+	.has_pending_intr = apicv_advanced_has_pending_intr,
 	.apic_read_access_may_valid  = apicv_advanced_apic_read_access_may_valid,
 	.apic_write_access_may_valid  = apicv_advanced_apic_write_access_may_valid,
 	.x2apic_read_msr_may_valid  = apicv_advanced_x2apic_read_msr_may_valid,

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

@@ -100,6 +100,7 @@ struct acrn_apicv_ops {
 	void (*accept_intr)(struct acrn_vlapic *vlapic, uint32_t vector, bool level);
 	bool (*inject_intr)(struct acrn_vlapic *vlapic, bool guest_irq_enabled, bool injected);
 	bool (*has_pending_delivery_intr)(struct acrn_vcpu *vcpu);
+	bool (*has_pending_intr)(struct acrn_vcpu *vcpu);
 	bool (*apic_read_access_may_valid)(uint32_t offset);
 	bool (*apic_write_access_may_valid)(uint32_t offset);
 	bool (*x2apic_read_msr_may_valid)(uint32_t offset);
@@ -119,6 +120,7 @@ void vlapic_set_apicv_ops(void);
 
 bool vlapic_inject_intr(struct acrn_vlapic *vlapic, bool guest_irq_enabled, bool injected);
 bool vlapic_has_pending_delivery_intr(struct acrn_vcpu *vcpu);
+bool vlapic_has_pending_intr(struct acrn_vcpu *vcpu);
 
 /**
  * @brief Get physical address to PIR description.