LoongArch: KVM: Check interrupt route from physical CPU

With EIOINTC interrupt controller, physical CPU ID is set for irq route.
However the function kvm_get_vcpu() is used to get destination vCPU when
delivering irq. With API kvm_get_vcpu(), the logical CPU ID is used.

With API kvm_get_vcpu_by_cpuid(), vCPU ID can be searched from physical
CPU ID.

Cc: stable@vger.kernel.org
Fixes: 3956a52 ("LoongArch: KVM: Add EIOINTC read and write functions")
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

Author: bibo-mao

arch/loongarch/kvm/intc/eiointc.c

@@ -9,7 +9,8 @@
 
 static void eiointc_set_sw_coreisr(struct loongarch_eiointc *s)
 {
-	int ipnum, cpu, irq_index, irq_mask, irq;
+	int ipnum, cpu, cpuid, irq_index, irq_mask, irq;
+	struct kvm_vcpu *vcpu;
 
 	for (irq = 0; irq < EIOINTC_IRQS; irq++) {
 		ipnum = s->ipmap.reg_u8[irq / 32];
@@ -20,7 +21,12 @@ static void eiointc_set_sw_coreisr(struct loongarch_eiointc *s)
 		irq_index = irq / 32;
 		irq_mask = BIT(irq & 0x1f);
 
-		cpu = s->coremap.reg_u8[irq];
+		cpuid = s->coremap.reg_u8[irq];
+		vcpu = kvm_get_vcpu_by_cpuid(s->kvm, cpuid);
+		if (!vcpu)
+			continue;
+
+		cpu = vcpu->vcpu_id;
 		if (!!(s->coreisr.reg_u32[cpu][irq_index] & irq_mask))
 			set_bit(irq, s->sw_coreisr[cpu][ipnum]);
 		else
@@ -68,17 +74,23 @@ static void eiointc_update_irq(struct loongarch_eiointc *s, int irq, int level)
 static inline void eiointc_update_sw_coremap(struct loongarch_eiointc *s,
 					int irq, u64 val, u32 len, bool notify)
 {
-	int i, cpu;
+	int i, cpu, cpuid;
+	struct kvm_vcpu *vcpu;
 
 	for (i = 0; i < len; i++) {
-		cpu = val & 0xff;
+		cpuid = val & 0xff;
 		val = val >> 8;
 
 		if (!(s->status & BIT(EIOINTC_ENABLE_CPU_ENCODE))) {
-			cpu = ffs(cpu) - 1;
-			cpu = (cpu >= 4) ? 0 : cpu;
+			cpuid = ffs(cpuid) - 1;
+			cpuid = (cpuid >= 4) ? 0 : cpuid;
 		}
 
+		vcpu = kvm_get_vcpu_by_cpuid(s->kvm, cpuid);
+		if (!vcpu)
+			continue;
+
+		cpu = vcpu->vcpu_id;
 		if (s->sw_coremap[irq + i] == cpu)
 			continue;