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Message-Id: <20231020091946.12173-10-yi.l.liu@intel.com>
Date: Fri, 20 Oct 2023 02:19:45 -0700
From: Yi Liu <yi.l.liu@...el.com>
To: joro@...tes.org, alex.williamson@...hat.com, jgg@...dia.com,
kevin.tian@...el.com, robin.murphy@....com,
baolu.lu@...ux.intel.com
Cc: cohuck@...hat.com, eric.auger@...hat.com, nicolinc@...dia.com,
kvm@...r.kernel.org, mjrosato@...ux.ibm.com,
chao.p.peng@...ux.intel.com, yi.l.liu@...el.com,
yi.y.sun@...ux.intel.com, peterx@...hat.com, jasowang@...hat.com,
shameerali.kolothum.thodi@...wei.com, lulu@...hat.com,
suravee.suthikulpanit@....com, iommu@...ts.linux.dev,
linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
zhenzhong.duan@...el.com, joao.m.martins@...cle.com,
xin.zeng@...el.com
Subject: [PATCH v5 09/10] iommufd/selftest: Add nested domain allocation for mock domain
From: Nicolin Chen <nicolinc@...dia.com>
Add nested domain support in the ->domain_alloc_user op with some proper
sanity checks. Then, add a domain_nested_ops for all nested domains and
split the get_md_pagetable helper into paging and nested helpers.
Also, add an iotlb as a testing property of a nested domain.
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
Signed-off-by: Yi Liu <yi.l.liu@...el.com>
---
drivers/iommu/iommufd/iommufd_test.h | 18 ++++
drivers/iommu/iommufd/selftest.c | 135 +++++++++++++++++++++++----
2 files changed, 133 insertions(+), 20 deletions(-)
diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h
index 3f3644375bf1..440ec3d64099 100644
--- a/drivers/iommu/iommufd/iommufd_test.h
+++ b/drivers/iommu/iommufd/iommufd_test.h
@@ -40,6 +40,11 @@ enum {
MOCK_FLAGS_ACCESS_CREATE_NEEDS_PIN_PAGES = 1 << 0,
};
+enum {
+ MOCK_NESTED_DOMAIN_IOTLB_ID_MAX = 3,
+ MOCK_NESTED_DOMAIN_IOTLB_NUM = 4,
+};
+
struct iommu_test_cmd {
__u32 size;
__u32 op;
@@ -109,4 +114,17 @@ struct iommu_test_hw_info {
__u32 test_reg;
};
+/* Should not be equal to any defined value in enum iommu_hwpt_data_type */
+#define IOMMU_HWPT_DATA_SELFTEST 0xdead
+
+/**
+ * struct iommu_hwpt_selftest
+ *
+ * @iotlb: default mock iotlb value, IOMMU_TEST_IOTLB_DEFAULT
+ */
+struct iommu_hwpt_selftest {
+#define IOMMU_TEST_IOTLB_DEFAULT 0xbadbeef
+ __u32 iotlb;
+};
+
#endif
diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index eca5b1d0919d..5f513c5d6876 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -90,6 +90,12 @@ struct mock_iommu_domain {
struct xarray pfns;
};
+struct mock_iommu_domain_nested {
+ struct iommu_domain domain;
+ struct mock_iommu_domain *parent;
+ u32 iotlb[MOCK_NESTED_DOMAIN_IOTLB_NUM];
+};
+
enum selftest_obj_type {
TYPE_IDEV,
};
@@ -147,20 +153,16 @@ static void *mock_domain_hw_info(struct device *dev, u32 *length, u32 *type)
}
static const struct iommu_ops mock_ops;
+static struct iommu_domain_ops domain_nested_ops;
-static struct iommu_domain *mock_domain_alloc(unsigned int iommu_domain_type)
+static struct iommu_domain *
+__mock_domain_alloc_paging(unsigned int iommu_domain_type)
{
struct mock_iommu_domain *mock;
- if (iommu_domain_type == IOMMU_DOMAIN_BLOCKED)
- return &mock_blocking_domain;
-
- if (iommu_domain_type != IOMMU_DOMAIN_UNMANAGED)
- return NULL;
-
mock = kzalloc(sizeof(*mock), GFP_KERNEL);
if (!mock)
- return NULL;
+ return ERR_PTR(-ENOMEM);
mock->domain.geometry.aperture_start = MOCK_APERTURE_START;
mock->domain.geometry.aperture_end = MOCK_APERTURE_LAST;
mock->domain.pgsize_bitmap = MOCK_IO_PAGE_SIZE;
@@ -170,20 +172,72 @@ static struct iommu_domain *mock_domain_alloc(unsigned int iommu_domain_type)
return &mock->domain;
}
+static struct iommu_domain *
+__mock_domain_alloc_nested(struct mock_iommu_domain *mock_parent,
+ const struct iommu_hwpt_selftest *user_cfg)
+{
+ struct mock_iommu_domain_nested *mock_nested;
+ int i;
+
+ mock_nested = kzalloc(sizeof(*mock_nested), GFP_KERNEL);
+ if (!mock_nested)
+ return ERR_PTR(-ENOMEM);
+ mock_nested->parent = mock_parent;
+ mock_nested->domain.ops = &domain_nested_ops;
+ mock_nested->domain.type = IOMMU_DOMAIN_NESTED;
+ for (i = 0; i < MOCK_NESTED_DOMAIN_IOTLB_NUM; i++)
+ mock_nested->iotlb[i] = user_cfg->iotlb;
+ return &mock_nested->domain;
+}
+
+static struct iommu_domain *mock_domain_alloc(unsigned int iommu_domain_type)
+{
+ struct iommu_domain *domain;
+
+ if (iommu_domain_type == IOMMU_DOMAIN_BLOCKED)
+ return &mock_blocking_domain;
+ if (iommu_domain_type != IOMMU_DOMAIN_UNMANAGED)
+ return NULL;
+ domain = __mock_domain_alloc_paging(iommu_domain_type);
+ if (IS_ERR(domain))
+ domain = NULL;
+ return domain;
+}
+
static struct iommu_domain *
mock_domain_alloc_user(struct device *dev, u32 flags,
struct iommu_domain *parent,
const struct iommu_user_data *user_data)
{
- struct iommu_domain *domain;
+ struct mock_iommu_domain *mock_parent;
+ struct iommu_hwpt_selftest user_cfg;
+ int rc;
if (flags & (~IOMMU_HWPT_ALLOC_NEST_PARENT))
return ERR_PTR(-EOPNOTSUPP);
- domain = mock_domain_alloc(IOMMU_DOMAIN_UNMANAGED);
- if (!domain)
- domain = ERR_PTR(-ENOMEM);
- return domain;
+ if (!user_data) { /* must be mock_domain */
+ if (parent)
+ return ERR_PTR(-EINVAL);
+ return __mock_domain_alloc_paging(IOMMU_DOMAIN_UNMANAGED);
+ }
+
+ /* must be mock_domain_nested */
+ if (user_data->type != IOMMU_HWPT_DATA_SELFTEST)
+ return ERR_PTR(-EOPNOTSUPP);
+ if (!parent || parent->ops != mock_ops.default_domain_ops)
+ return ERR_PTR(-EINVAL);
+
+ mock_parent = container_of(parent, struct mock_iommu_domain, domain);
+ if (!mock_parent)
+ return ERR_PTR(-EINVAL);
+
+ rc = iommu_copy_struct_from_user(&user_cfg, user_data,
+ IOMMU_HWPT_DATA_SELFTEST, iotlb);
+ if (rc)
+ return ERR_PTR(rc);
+
+ return __mock_domain_alloc_nested(mock_parent, &user_cfg);
}
static void mock_domain_free(struct iommu_domain *domain)
@@ -342,19 +396,41 @@ static const struct iommu_ops mock_ops = {
},
};
+static void mock_domain_free_nested(struct iommu_domain *domain)
+{
+ struct mock_iommu_domain_nested *mock_nested =
+ container_of(domain, struct mock_iommu_domain_nested, domain);
+
+ kfree(mock_nested);
+}
+
+static struct iommu_domain_ops domain_nested_ops = {
+ .free = mock_domain_free_nested,
+ .attach_dev = mock_domain_nop_attach,
+};
+
static inline struct iommufd_hw_pagetable *
-get_md_pagetable(struct iommufd_ucmd *ucmd, u32 mockpt_id,
- struct mock_iommu_domain **mock)
+__get_md_pagetable(struct iommufd_ucmd *ucmd, u32 mockpt_id, u32 hwpt_type)
{
- struct iommufd_hw_pagetable *hwpt;
struct iommufd_object *obj;
- obj = iommufd_get_object(ucmd->ictx, mockpt_id,
- IOMMUFD_OBJ_HWPT_PAGING);
+ obj = iommufd_get_object(ucmd->ictx, mockpt_id, hwpt_type);
if (IS_ERR(obj))
return ERR_CAST(obj);
- hwpt = container_of(obj, struct iommufd_hw_pagetable, obj);
- if (hwpt->domain->ops != mock_ops.default_domain_ops) {
+ return container_of(obj, struct iommufd_hw_pagetable, obj);
+}
+
+static inline struct iommufd_hw_pagetable *
+get_md_pagetable(struct iommufd_ucmd *ucmd, u32 mockpt_id,
+ struct mock_iommu_domain **mock)
+{
+ struct iommufd_hw_pagetable *hwpt;
+
+ hwpt = __get_md_pagetable(ucmd, mockpt_id, IOMMUFD_OBJ_HWPT_PAGING);
+ if (IS_ERR(hwpt))
+ return hwpt;
+ if (hwpt->domain->type != IOMMU_DOMAIN_UNMANAGED ||
+ hwpt->domain->ops != mock_ops.default_domain_ops) {
iommufd_put_object(&hwpt->obj);
return ERR_PTR(-EINVAL);
}
@@ -362,6 +438,25 @@ get_md_pagetable(struct iommufd_ucmd *ucmd, u32 mockpt_id,
return hwpt;
}
+static inline struct iommufd_hw_pagetable *
+get_md_pagetable_nested(struct iommufd_ucmd *ucmd, u32 mockpt_id,
+ struct mock_iommu_domain_nested **mock_nested)
+{
+ struct iommufd_hw_pagetable *hwpt;
+
+ hwpt = __get_md_pagetable(ucmd, mockpt_id, IOMMUFD_OBJ_HWPT_NESTED);
+ if (IS_ERR(hwpt))
+ return hwpt;
+ if (hwpt->domain->type != IOMMU_DOMAIN_NESTED ||
+ hwpt->domain->ops != &domain_nested_ops) {
+ iommufd_put_object(&hwpt->obj);
+ return ERR_PTR(-EINVAL);
+ }
+ *mock_nested = container_of(hwpt->domain,
+ struct mock_iommu_domain_nested, domain);
+ return hwpt;
+}
+
struct mock_bus_type {
struct bus_type bus;
struct notifier_block nb;
--
2.34.1
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