kvm: arm/arm64: add irqsave for lpi_cache_lock

euleros inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4J0W7
CVE: NA

-------------------------------------------------

lpi_cache_lock can be called in irq context,
so it should use irqsave spinlock.
Signed-off-by: NYiwen Jiang <jiangyiwen@huawei.com>
Reviewed-by: NHailiang Zhang <zhang.zhanghailiang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NChaochao Xing <xingchaochao@huawei.com>
Reviewed-by: NXiangyou Xie <xiexiangyou@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/arm64/kvm/vgic/vgic-its.c

@@ -593,15 +593,16 @@ static struct vgic_irq *vgic_its_check_cache(struct kvm *kvm, phys_addr_t db,
 {
 	struct vgic_dist *dist = &kvm->arch.vgic;
 	struct vgic_irq *irq;
+	unsigned long flags;
 	int cpu;
 	int cacheid;
 
 	cpu = smp_processor_id();
 	cacheid = cpu % LPI_TRANS_CACHES_NUM;
 
-	raw_spin_lock(&dist->lpi_translation_cache[cacheid].lpi_cache_lock);
+	raw_spin_lock_irqsave(&dist->lpi_translation_cache[cacheid].lpi_cache_lock, flags);
 	irq = __vgic_its_check_cache(dist, db, devid, eventid, cacheid);
-	raw_spin_unlock(&dist->lpi_translation_cache[cacheid].lpi_cache_lock);
+	raw_spin_unlock_irqrestore(&dist->lpi_translation_cache[cacheid].lpi_cache_lock, flags);
 
 	return irq;
 }