linux-kernel - Re: [PATCH V2 2/3] vhost: vdpa: report iova range

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Date:   Mon, 31 Aug 2020 16:38:40 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Eli Cohen <elic@...dia.com>
Cc:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, rob.miller@...adcom.com,
        lingshan.zhu@...el.com, eperezma@...hat.com, lulu@...hat.com,
        shahafs@...lanox.com, hanand@...inx.com, mhabets@...arflare.com,
        gdawar@...inx.com, saugatm@...inx.com, vmireyno@...vell.com,
        zhangweining@...jie.com.cn, eli@...lanox.com
Subject: Re: [PATCH V2 2/3] vhost: vdpa: report iova range


On 2020/8/23 下午2:40, Eli Cohen wrote:
>> +static void vhost_vdpa_set_iova_range(struct vhost_vdpa *v)
>> +{
>> +	struct vdpa_iova_range *range = &v->range;
>> +	struct iommu_domain_geometry geo;
>> +	struct vdpa_device *vdpa = v->vdpa;
>> +	const struct vdpa_config_ops *ops = vdpa->config;
>> +
>> +	if (ops->get_iova_range) {
>> +		*range = ops->get_iova_range(vdpa);
>> +	} else if (v->domain &&
>> +		   !iommu_domain_get_attr(v->domain,
>> +		   DOMAIN_ATTR_GEOMETRY, &geo) &&
>> +		   geo.force_aperture) {
>> +		range->first = geo.aperture_start;
>> +		range->last = geo.aperture_end;
>> +	} else {
>> +		range->first = 0;
>> +		range->last = ULLONG_MAX;
>> +	}
> Shouldn't we require drivers that publish VIRTIO_F_ACCESS_PLATFORM to
> implement get_iova_range?


Probably not, since ACCESS_PLATFORM does not exclude the device that 
depends on the chipset IOMMU to work. So in that case, we should query 
IOMMU driver instead of vDPA device driver.

Thanks


>
>> +}