linux-kernel - [PATCH v4 05/11] iommufd: Add domain_alloc_nested op to iommufd_viommu

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Message-ID: <1314e12b76edd84a8c9d0f14a6598538c8eeb50e.1729553811.git.nicolinc@nvidia.com>
Date: Mon, 21 Oct 2024 17:19:27 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <kevin.tian@...el.com>, <will@...nel.org>
CC: <joro@...tes.org>, <suravee.suthikulpanit@....com>,
	<robin.murphy@....com>, <dwmw2@...radead.org>, <baolu.lu@...ux.intel.com>,
	<shuah@...nel.org>, <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kselftest@...r.kernel.org>,
	<eric.auger@...hat.com>, <jean-philippe@...aro.org>, <mdf@...nel.org>,
	<mshavit@...gle.com>, <shameerali.kolothum.thodi@...wei.com>,
	<smostafa@...gle.com>, <yi.l.liu@...el.com>, <aik@....com>,
	<zhangfei.gao@...aro.org>, <patches@...ts.linux.dev>
Subject: [PATCH v4 05/11] iommufd: Add domain_alloc_nested op to iommufd_viommu_ops

Allow IOMMU driver to use a vIOMMU object that holds a nesting parent
hwpt/domain to allocate a nested domain.

Suggested-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 include/linux/iommufd.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index 55054fbc793c..5c13c35952d8 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -14,6 +14,7 @@
 struct device;
 struct file;
 struct iommu_group;
+struct iommu_user_data;
 struct iommufd_access;
 struct iommufd_ctx;
 struct iommufd_device;
@@ -95,9 +96,17 @@ struct iommufd_viommu {
  * struct iommufd_viommu_ops - vIOMMU specific operations
  * @free: Free all driver-specific parts of an iommufd_viommu. The memory of the
  *        vIOMMU will be free-ed by iommufd core after calling this free op.
+ * @domain_alloc_nested: Allocate a IOMMU_DOMAIN_NESTED on a vIOMMU that holds a
+ *                       nesting parent domain (IOMMU_DOMAIN_PAGING). @user_data
+ *                       must be defined in include/uapi/linux/iommufd.h.
+ *                       It must fully initialize the new iommu_domain before
+ *                       returning. Upon failure, ERR_PTR must be returned.
  */
 struct iommufd_viommu_ops {
 	void (*free)(struct iommufd_viommu *viommu);
+	struct iommu_domain *(*domain_alloc_nested)(
+		struct iommufd_viommu *viommu,
+		const struct iommu_user_data *user_data);
 };
 
 #if IS_ENABLED(CONFIG_IOMMUFD)
-- 
2.43.0