hv: vlapic: add vector check for x2apic SELF IPI

Set when the local APIC detects an illegal vector (one in the range 0 to 15)
in the message that it is sending. This occurs as the result of a write to the
ICR (in both xAPIC and x2APIC modes) or to SELF IPI register (x2APIC mode only)
with an illegal vector.

Tracked-On: #1842
Signed-off-by: Li, Fei1 <fei1.li@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

Author: lifeix

hypervisor/arch/x86/guest/vlapic.c

@@ -2456,9 +2456,14 @@ static void vlapic_x2apic_self_ipi_handler(struct acrn_vlapic *vlapic)
 	struct acrn_vcpu *target_vcpu;
 
 	lapic = &(vlapic->apic_page);
-	vector = lapic->self_ipi.v & 0xFFU;
+	vector = lapic->self_ipi.v & APIC_VECTOR_MASK;
 	target_vcpu = vlapic->vcpu;
-	vlapic_set_intr(target_vcpu, vector, LAPIC_TRIG_EDGE);
+	if (vector < 16U) {
+		vlapic_set_error(vlapic, APIC_ESR_SEND_ILLEGAL_VECTOR);
+		dev_dbg(ACRN_DBG_LAPIC, "Ignoring invalid IPI %u", vector);
+	} else {
+		vlapic_set_intr(target_vcpu, vector, LAPIC_TRIG_EDGE);
+	}
 }
 
 int32_t apic_write_vmexit_handler(struct acrn_vcpu *vcpu)