[PATCH v8 3/8] iommu/vt-d: Add helper for nested domain allocation

Yi Liu
2023-10-26T04:43:22Z

From: Lu Baolu <baolu.lu@linux.intel.com>

This adds helper for accepting user parameters and allocate a nested
domain.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
drivers/iommu/intel/Makefile | 2 +-
drivers/iommu/intel/iommu.h | 2 ++
drivers/iommu/intel/nested.c | 62 ++++++++++++++++++++++++++++++++++++
3 files changed, 65 insertions(+), 1 deletion(-)
create mode 100644 drivers/iommu/intel/nested.c

diff --git a/drivers/iommu/intel/Makefile b/drivers/iommu/intel/Makefile
index 7af3b8a4f2a0..5dabf081a779 100644
--- a/drivers/iommu/intel/Makefile
+++ b/drivers/iommu/intel/Makefile
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_DMAR_TABLE) += dmar.o
-obj-$(CONFIG_INTEL_IOMMU) += iommu.o pasid.o
+obj-$(CONFIG_INTEL_IOMMU) += iommu.o pasid.o nested.o
obj-$(CONFIG_DMAR_TABLE) += trace.o cap_audit.o
obj-$(CONFIG_DMAR_PERF) += perf.o
obj-$(CONFIG_INTEL_IOMMU_DEBUGFS) += debugfs.o
diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h
index 244f111ea0bb..f59a9374f62d 100644
--- a/drivers/iommu/intel/iommu.h
+++ b/drivers/iommu/intel/iommu.h
@@ -884,6 +884,8 @@ void *alloc_pgtable_page(int node, gfp_t gfp);
void free_pgtable_page(void *vaddr);
void iommu_flush_write_buffer(struct intel_iommu *iommu);
struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn);
+struct iommu_domain *intel_nested_domain_alloc(struct iommu_domain *parent,
+ const struct iommu_user_data *user_data);

#ifdef CONFIG_INTEL_IOMMU_SVM
void intel_svm_check(struct intel_iommu *iommu);
diff --git a/drivers/iommu/intel/nested.c b/drivers/iommu/intel/nested.c
new file mode 100644
index 000000000000..56bb205fca06
--- /dev/null
+++ b/drivers/iommu/intel/nested.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * nested.c - nested mode translation support
+ *
+ * Copyright (C) 2023 Intel Corporation
+ *
+ * Author: Lu Baolu <baolu.lu@linux.intel.com>
+ * Jacob Pan <jacob.jun.pan@linux.intel.com>
+ * Yi Liu <yi.l.liu@intel.com>
+ */
+
+#define pr_fmt(fmt) "DMAR: " fmt
+
+#include <linux/iommu.h>
+
+#include "iommu.h"
+
+static void intel_nested_domain_free(struct iommu_domain *domain)
+{
+ kfree(to_dmar_domain(domain));
+}
+
+static const struct iommu_domain_ops intel_nested_domain_ops = {
+ .free = intel_nested_domain_free,
+};
+
+struct iommu_domain *intel_nested_domain_alloc(struct iommu_domain *parent,
+ const struct iommu_user_data *user_data)
+{
+ struct dmar_domain *s2_domain = to_dmar_domain(parent);
+ struct iommu_hwpt_vtd_s1 vtd;
+ struct dmar_domain *domain;
+ int ret;
+
+ /* Must be nested domain */
+ if (user_data->type != IOMMU_HWPT_DATA_VTD_S1)
+ return ERR_PTR(-EOPNOTSUPP);
+ if (parent->ops != intel_iommu_ops.default_domain_ops)
+ return ERR_PTR(-EINVAL);
+
+ ret = iommu_copy_struct_from_user(&vtd, user_data,
+ IOMMU_HWPT_DATA_VTD_S1, __reserved);
+ if (ret)
+ return ERR_PTR(ret);
+
+ domain = kzalloc(sizeof(*domain), GFP_KERNEL_ACCOUNT);
+ if (!domain)
+ return ERR_PTR(-ENOMEM);
+
+ domain->use_first_level = true;
+ domain->s2_domain = s2_domain;
+ domain->s1_pgtbl = vtd.pgtbl_addr;
+ domain->s1_cfg = vtd;
+ domain->domain.ops = &intel_nested_domain_ops;
+ domain->domain.type = IOMMU_DOMAIN_NESTED;
+ INIT_LIST_HEAD(&domain->devices);
+ INIT_LIST_HEAD(&domain->dev_pasids);
+ spin_lock_init(&domain->lock);
+ xa_init(&domain->iommu_array);
+
+ return &domain->domain;
+}
--
2.34.1