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iommu/amd: Add support for nested domain attach/detach

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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>
This commit is contained in:
Suravee Suthikulpanit 2026-01-15 06:08:14 +00:00 committed by Joerg Roedel
parent 93eee2a49c
commit 103f4e7c85
1 changed files with 73 additions and 0 deletions
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73
drivers/iommu/amd/nested.c
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@ -183,6 +183,78 @@ amd_iommu_alloc_domain_nested(struct iommufd_viommu *viommu, u32 flags,
return ERR_PTR(ret);
}
static void set_dte_nested(struct amd_iommu *iommu, struct iommu_domain *dom,
struct iommu_dev_data *dev_data, struct dev_table_entry *new)
{
struct protection_domain *parent;
struct nested_domain *ndom = to_ndomain(dom);
struct iommu_hwpt_amd_guest *gdte = &ndom->gdte;
struct pt_iommu_amdv1_hw_info pt_info;
/*
* The nest parent domain is attached during the call to the
* struct iommu_ops.viommu_init(), which will be stored as part
* of the struct amd_iommu_viommu.parent.
*/
if (WARN_ON(!ndom->viommu || !ndom->viommu->parent))
return;
parent = ndom->viommu->parent;
amd_iommu_make_clear_dte(dev_data, new);
/* Retrieve the current pagetable info via the IOMMU PT API. */
pt_iommu_amdv1_hw_info(&parent->amdv1, &pt_info);
/*
* Use domain ID from nested domain to program DTE.
* See amd_iommu_alloc_domain_nested().
*/
amd_iommu_set_dte_v1(dev_data, parent, ndom->gdom_info->hdom_id,
&pt_info, new);
/* GV is required for nested page table */
new->data[0] |= DTE_FLAG_GV;
/* Guest PPR */
new->data[0] |= gdte->dte[0] & DTE_FLAG_PPR;
/* Guest translation stuff */
new->data[0] |= gdte->dte[0] & (DTE_GLX | DTE_FLAG_GIOV);
/* GCR3 table */
new->data[0] |= gdte->dte[0] & DTE_GCR3_14_12;
new->data[1] |= gdte->dte[1] & (DTE_GCR3_30_15 | DTE_GCR3_51_31);
/* Guest paging mode */
new->data[2] |= gdte->dte[2] & DTE_GPT_LEVEL_MASK;
}
static int nested_attach_device(struct iommu_domain *dom, struct device *dev,
struct iommu_domain *old)
{
struct dev_table_entry new = {0};
struct iommu_dev_data *dev_data = dev_iommu_priv_get(dev);
struct amd_iommu *iommu = get_amd_iommu_from_dev_data(dev_data);
int ret = 0;
/*
* Needs to make sure PASID is not enabled
* for this attach path.
*/
if (WARN_ON(dev_data->pasid_enabled))
return -EINVAL;
mutex_lock(&dev_data->mutex);
set_dte_nested(iommu, dom, dev_data, &new);
amd_iommu_update_dte(iommu, dev_data, &new);
mutex_unlock(&dev_data->mutex);
return ret;
}
static void nested_domain_free(struct iommu_domain *dom)
{
struct guest_domain_mapping_info *curr;
@ -217,5 +289,6 @@ static void nested_domain_free(struct iommu_domain *dom)
}
static const struct iommu_domain_ops nested_domain_ops = {
.attach_dev = nested_attach_device,
.free = nested_domain_free,
};