Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
iommu/amd: Add support for nested domain attach/detach
Introduce set_dte_nested() to program guest translation settings in
the host DTE when attaches the nested domain to a device.
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
authored by
Suravee Suthikulpanit
and committed by
Joerg Roedel
103f4e7c
93eee2a4
+73
+73
drivers/iommu/amd/nested.c
+73
drivers/iommu/amd/nested.c
···
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return ERR_PTR(ret);
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}
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static void set_dte_nested(struct amd_iommu *iommu, struct iommu_domain *dom,
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struct iommu_dev_data *dev_data, struct dev_table_entry *new)
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{
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struct protection_domain *parent;
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struct nested_domain *ndom = to_ndomain(dom);
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struct iommu_hwpt_amd_guest *gdte = &ndom->gdte;
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struct pt_iommu_amdv1_hw_info pt_info;
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/*
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* The nest parent domain is attached during the call to the
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* struct iommu_ops.viommu_init(), which will be stored as part
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* of the struct amd_iommu_viommu.parent.
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*/
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if (WARN_ON(!ndom->viommu || !ndom->viommu->parent))
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return;
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parent = ndom->viommu->parent;
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amd_iommu_make_clear_dte(dev_data, new);
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/* Retrieve the current pagetable info via the IOMMU PT API. */
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pt_iommu_amdv1_hw_info(&parent->amdv1, &pt_info);
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/*
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* Use domain ID from nested domain to program DTE.
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* See amd_iommu_alloc_domain_nested().
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*/
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amd_iommu_set_dte_v1(dev_data, parent, ndom->gdom_info->hdom_id,
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&pt_info, new);
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/* GV is required for nested page table */
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new->data[0] |= DTE_FLAG_GV;
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/* Guest PPR */
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new->data[0] |= gdte->dte[0] & DTE_FLAG_PPR;
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/* Guest translation stuff */
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new->data[0] |= gdte->dte[0] & (DTE_GLX | DTE_FLAG_GIOV);
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/* GCR3 table */
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new->data[0] |= gdte->dte[0] & DTE_GCR3_14_12;
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new->data[1] |= gdte->dte[1] & (DTE_GCR3_30_15 | DTE_GCR3_51_31);
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/* Guest paging mode */
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new->data[2] |= gdte->dte[2] & DTE_GPT_LEVEL_MASK;
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}
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static int nested_attach_device(struct iommu_domain *dom, struct device *dev,
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struct iommu_domain *old)
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{
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struct dev_table_entry new = {0};
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struct iommu_dev_data *dev_data = dev_iommu_priv_get(dev);
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struct amd_iommu *iommu = get_amd_iommu_from_dev_data(dev_data);
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int ret = 0;
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/*
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* Needs to make sure PASID is not enabled
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* for this attach path.
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*/
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if (WARN_ON(dev_data->pasid_enabled))
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return -EINVAL;
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mutex_lock(&dev_data->mutex);
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set_dte_nested(iommu, dom, dev_data, &new);
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amd_iommu_update_dte(iommu, dev_data, &new);
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mutex_unlock(&dev_data->mutex);
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return ret;
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}
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static void nested_domain_free(struct iommu_domain *dom)
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{
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struct guest_domain_mapping_info *curr;
···
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}
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static const struct iommu_domain_ops nested_domain_ops = {
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.attach_dev = nested_attach_device,
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.free = nested_domain_free,
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};