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iommu: Add domain_alloc_identity()

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virtio-iommu has a mode where the IDENTITY domain is actually a paging
domain with an identity mapping covering some of the system address
space manually created.

To support this add a new domain_alloc_identity() op that accepts
the struct device so that virtio can allocate and fully finalize a
paging domain to return.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/2-v4-ff5fb6b03bd1+288-iommu_virtio_domains_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jason Gunthorpe 2025-04-08 13:35:48 -03:00 committed by Joerg Roedel
parent 0d76a6edae
commit 0d609a1450
2 changed files with 16 additions and 8 deletions
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20
drivers/iommu/iommu.c
View File

@ -1631,15 +1631,19 @@ static struct iommu_domain *__iommu_alloc_identity_domain(struct device *dev)
if (ops->identity_domain)
return ops->identity_domain;
/* Older drivers create the identity domain via ops->domain_alloc() */
if (!ops->domain_alloc)
if (ops->domain_alloc_identity) {
domain = ops->domain_alloc_identity(dev);
if (IS_ERR(domain))
return domain;
} else if (ops->domain_alloc) {
domain = ops->domain_alloc(IOMMU_DOMAIN_IDENTITY);
if (!domain)
return ERR_PTR(-ENOMEM);
if (IS_ERR(domain))
return domain;
} else {
return ERR_PTR(-EOPNOTSUPP);
domain = ops->domain_alloc(IOMMU_DOMAIN_IDENTITY);
if (IS_ERR(domain))
return domain;
if (!domain)
return ERR_PTR(-ENOMEM);
}
iommu_domain_init(domain, IOMMU_DOMAIN_IDENTITY, ops);
return domain;

4
include/linux/iommu.h
View File

@ -567,6 +567,9 @@ iommu_copy_struct_from_full_user_array(void *kdst, size_t kdst_entry_size,
* @domain_alloc: allocate and return an iommu domain if success. Otherwise
* NULL is returned. The domain is not fully initialized until
* the caller iommu_domain_alloc() returns.
* @domain_alloc_identity: allocate an IDENTITY domain. Drivers should prefer to
* use identity_domain instead. This should only be used
* if dynamic logic is necessary.
* @domain_alloc_paging_flags: Allocate an iommu domain corresponding to the
* input parameters as defined in
* include/uapi/linux/iommufd.h. The @user_data can be
@ -625,6 +628,7 @@ struct iommu_ops {
/* Domain allocation and freeing by the iommu driver */
struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
struct iommu_domain *(*domain_alloc_identity)(struct device *dev);
struct iommu_domain *(*domain_alloc_paging_flags)(
struct device *dev, u32 flags,
const struct iommu_user_data *user_data);