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From: Nicolin Chen <nicolinc@nvidia.com>
To: <jgg@nvidia.com>, <kevin.tian@intel.com>
Cc: <yi.l.liu@intel.com>, <joro@8bytes.org>, <will@kernel.org>,
	<robin.murphy@arm.com>, <alex.williamson@redhat.com>,
	<shuah@kernel.org>, <linux-kernel@vger.kernel.org>,
	<iommu@lists.linux.dev>, <kvm@vger.kernel.org>,
	<linux-kselftest@vger.kernel.org>, <mjrosato@linux.ibm.com>,
	<farman@linux.ibm.com>
Subject: [PATCH v9 4/6] iommufd: Add iommufd_access_replace() API
Date: Thu, 27 Jul 2023 00:23:09 -0700	[thread overview]
Message-ID: <ab1aa02afc96d8cc4711870287e1cb81d7c9558e.1690440730.git.nicolinc@nvidia.com> (raw)
In-Reply-To: <cover.1690440730.git.nicolinc@nvidia.com>

Taking advantage of the new iommufd_access_change_ioas helper, add a new
iommufd_access_replace() for VFIO emulated pathway to use.

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
 drivers/iommu/iommufd/device.c | 17 +++++++++++++++++
 include/linux/iommufd.h        |  1 +
 2 files changed, 18 insertions(+)

diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c
index d9680a247e1c..2dfeb65c7090 100644
--- a/drivers/iommu/iommufd/device.c
+++ b/drivers/iommu/iommufd/device.c
@@ -844,6 +844,23 @@ int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id)
 }
 EXPORT_SYMBOL_NS_GPL(iommufd_access_attach, IOMMUFD);
 
+int iommufd_access_replace(struct iommufd_access *access, u32 ioas_id)
+{
+	struct iommufd_ctx *ictx = access->ictx;
+	int rc;
+
+	mutex_lock(&access->ioas_lock);
+	if (!access->ioas) {
+		mutex_unlock(&access->ioas_lock);
+		return -ENOENT;
+	}
+	rc = iommufd_access_change_ioas(access,
+					iommufd_get_ioas(ictx, ioas_id));
+	mutex_unlock(&access->ioas_lock);
+	return rc;
+}
+EXPORT_SYMBOL_NS_GPL(iommufd_access_replace, IOMMUFD);
+
 /**
  * iommufd_access_notify_unmap - Notify users of an iopt to stop using it
  * @iopt: iopt to work on
diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index 0ac60256b659..ffc3a949f837 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -49,6 +49,7 @@ iommufd_access_create(struct iommufd_ctx *ictx,
 		      const struct iommufd_access_ops *ops, void *data, u32 *id);
 void iommufd_access_destroy(struct iommufd_access *access);
 int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id);
+int iommufd_access_replace(struct iommufd_access *access, u32 ioas_id);
 void iommufd_access_detach(struct iommufd_access *access);
 
 void iommufd_ctx_get(struct iommufd_ctx *ictx);
-- 
2.41.0


  parent reply	other threads:[~2023-07-27  7:34 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-07-27  7:23 [PATCH v9 0/6] cover-letter: Add IO page table replacement support Nicolin Chen
2023-07-27  7:23 ` [PATCH v9 1/6] vfio: Do not allow !ops->dma_unmap in vfio_pin/unpin_pages() Nicolin Chen
2023-07-27  7:23 ` [PATCH v9 2/6] iommufd: Allow passing in iopt_access_list_id to iopt_remove_access() Nicolin Chen
2023-07-27  9:07   ` Nicolin Chen
2023-07-27 14:34   ` Jason Gunthorpe
2023-07-27  7:23 ` [PATCH v9 3/6] iommufd: Add iommufd_access_change_ioas helper Nicolin Chen
2023-07-27 14:40   ` Jason Gunthorpe
2023-07-27 18:47     ` Nicolin Chen
2023-07-27  7:23 ` Nicolin Chen [this message]
2023-07-27  7:23 ` [PATCH v9 5/6] iommufd/selftest: Add IOMMU_TEST_OP_ACCESS_REPLACE_IOAS coverage Nicolin Chen
2023-07-27  7:23 ` [PATCH v9 6/6] vfio: Support IO page table replacement Nicolin Chen

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