On 16/01/18 09:25, Auger Eric wrote:
[...]
>> +static int viommu_add_resv_mem(struct viommu_endpoint *vdev,
>> + struct virtio_iommu_probe_resv_mem *mem,
>> + size_t len)
>> +{
>> + struct iommu_resv_region *region = NULL;
>> + unsigned long prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
>> +
>> + u64 addr = le64_to_cpu(mem->addr);
>> + u64 size = le64_to_cpu(mem->size);
>> +
>> + if (len < sizeof(*mem))
>> + return -EINVAL;
>> +
>> + switch (mem->subtype) {
>> + case VIRTIO_IOMMU_RESV_MEM_T_MSI:
>> + region = iommu_alloc_resv_region(addr, size, prot,
>> + IOMMU_RESV_MSI);
>> + break;
>> + case VIRTIO_IOMMU_RESV_MEM_T_RESERVED:
>> + default:
>> + region = iommu_alloc_resv_region(addr, size, 0,
>> + IOMMU_RESV_RESERVED);
>> + break;
>> + }
>> +
>> + list_add(&vdev->resv_regions, ®ion->list);
>> +
>> + if (mem->subtype != VIRTIO_IOMMU_RESV_MEM_T_RESERVED &&
>> + mem->subtype != VIRTIO_IOMMU_RESV_MEM_T_MSI) {
>> + /* Please update your driver. */
>> + pr_warn("unknown resv mem subtype 0x%x\n", mem->subtype);
>> + return -EINVAL;
>> + }
> why not adding this in the switch default case and do not call list_add
> in case the subtype region is not recognized?
Even if the subtype isn't recognized, I think the range should still be
reserved, so that the guest kernel doesn't map it and break something.
That's why I put the following in the spec, 2.6.8.2.1 Driver
Requirements: Property RESV_MEM:
"""
The driver SHOULD treat any subtype it doesn’t recognize as if it was
VIRTIO_IOMMU_RESV_MEM_T_RESERVED.
"""
>> +
>> + return 0;
>> +}
>> +
>> +static int viommu_probe_endpoint(struct viommu_dev *viommu, struct device
>> *dev)
>> +{
>> + int ret;
>> + u16 type, len;
>> + size_t cur = 0;
>> + struct virtio_iommu_req_probe *probe;
>> + struct virtio_iommu_probe_property *prop;
>> + struct iommu_fwspec *fwspec = dev->iommu_fwspec;
>> + struct viommu_endpoint *vdev = fwspec->iommu_priv;
>> +
>> + if (!fwspec->num_ids)
>> + /* Trouble ahead. */
>> + return -EINVAL;
>> +
>> + probe = kzalloc(sizeof(*probe) + viommu->probe_size +
>> + sizeof(struct virtio_iommu_req_tail), GFP_KERNEL);
>> + if (!probe)
>> + return -ENOMEM;
>> +
>> + probe->head.type = VIRTIO_IOMMU_T_PROBE;
>> + /*
>> + * For now, assume that properties of an endpoint that outputs multiple
>> + * IDs are consistent. Only probe the first one.
>> + */
>> + probe->endpoint = cpu_to_le32(fwspec->ids[0]);
>> +
>> + ret = viommu_send_req_sync(viommu, probe);
>> + if (ret) {
> goto out?
Ok
[...]
>> +
>> + iommu_dma_get_resv_regions(dev, head);
> this change may belong to the 1st patch.
Indeed
Thanks,
Jean
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