LoongArch: KVM: Add address alignment check in pch_pic register access

commit 538c06e upstream.

With pch_pic device, its register is based on MMIO address space,
different access size 1/2/4/8 is supported. And base address should
be naturally aligned with its access size, here add alignment check
in its register access emulation function.

Cc: stable@vger.kernel.org
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: bibo-mao

arch/loongarch/kvm/intc/pch_pic.c

@@ -195,6 +195,11 @@ static int kvm_pch_pic_read(struct kvm_vcpu *vcpu,
 		return -EINVAL;
 	}
 
+	if (addr & (len - 1)) {
+		kvm_err("%s: pch pic not aligned addr %llx len %d\n", __func__, addr, len);
+		return -EINVAL;
+	}
+
 	/* statistics of pch pic reading */
 	vcpu->kvm->stat.pch_pic_read_exits++;
 	ret = loongarch_pch_pic_read(s, addr, len, val);
@@ -302,6 +307,11 @@ static int kvm_pch_pic_write(struct kvm_vcpu *vcpu,
 		return -EINVAL;
 	}
 
+	if (addr & (len - 1)) {
+		kvm_err("%s: pch pic not aligned addr %llx len %d\n", __func__, addr, len);
+		return -EINVAL;
+	}
+
 	/* statistics of pch pic writing */
 	vcpu->kvm->stat.pch_pic_write_exits++;
 	ret = loongarch_pch_pic_write(s, addr, len, val);