netdev - Re: [PATCH 11/21] vhost-vdpa: introduce asid based IOTLB

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Date:   Wed, 30 Dec 2020 14:34:59 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Eli Cohen <elic@...dia.com>
Cc:     mst@...hat.com, eperezma@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, lulu@...hat.com, eli@...lanox.com,
        lingshan.zhu@...el.com, rob.miller@...adcom.com,
        stefanha@...hat.com, sgarzare@...hat.com
Subject: Re: [PATCH 11/21] vhost-vdpa: introduce asid based IOTLB


On 2020/12/29 下午7:53, Eli Cohen wrote:
>> +
>> +static struct vhost_vdpa_as *vhost_vdpa_alloc_as(struct vhost_vdpa *v, u32 asid)
>> +{
>> +	struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS];
>> +	struct vhost_vdpa_as *as;
>> +
>> +	if (asid_to_as(v, asid))
>> +		return NULL;
>> +
>> +	as = kmalloc(sizeof(*as), GFP_KERNEL);
> kzalloc()? See comment below.
>
>> +	if (!as)
>> +		return NULL;
>> +
>> +	vhost_iotlb_init(&as->iotlb, 0, 0);
>> +	as->id = asid;
>> +	hlist_add_head(&as->hash_link, head);
>> +	++v->used_as;
> Although you eventually ended up removing used_as, this is a bug since
> you're incrementing a random value. Maybe it's better to be on the safe
> side and use kzalloc() for as above.


Yes and used_as needs to be removed.

Thanks



>