linux-kernel - [PATCH 1/6] iommu: Add dev_def_domain_type() callback in iommu

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200307062014.3288-2-baolu.lu@linux.intel.com>
Date:   Sat,  7 Mar 2020 14:20:09 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     ashok.raj@...el.com, jacob.jun.pan@...ux.intel.com,
        kevin.tian@...el.com, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Daniel Drake <drake@...lessm.com>,
        Derrick Jonathan <jonathan.derrick@...el.com>,
        Jerry Snitselaar <jsnitsel@...hat.com>,
        Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>,
        Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH 1/6] iommu: Add dev_def_domain_type() callback in iommu_ops

From: Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>

Some devices are reqired to use a specific type (identity or dma)
of default domain when they are used with a vendor iommu. When the
system level default domain type is different from it, the vendor
iommu driver has to request a new default domain with
iommu_request_dma_domain_for_dev() and iommu_request_dm_for_dev()
in the add_dev() callback. Unfortunately, these two helpers only
work when the group hasn't been assigned to any other devices,
hence, some vendor iommu driver has to use a private domain if
it fails to request a new default one.

This adds dev_def_domain_type() callback in the iommu_ops, so that
the special requirement of default domain for a device could be
aware by the iommu generic layer.

Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 include/linux/iommu.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index d1b5f4d98569..0c1e95e6b263 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -248,6 +248,10 @@ struct iommu_iotlb_gather {
  * @cache_invalidate: invalidate translation caches
  * @sva_bind_gpasid: bind guest pasid and mm
  * @sva_unbind_gpasid: unbind guest pasid and mm
+ * @dev_def_domain_type: device default domain type, return value:
+ *		- IOMMU_DOMAIN_IDENTITY: must use an identity domain
+ *		- IOMMU_DOMAIN_DMA: must use a dma domain
+ *		- 0: use the default setting
  * @pgsize_bitmap: bitmap of all possible supported page sizes
  * @owner: Driver module providing these ops
  */
@@ -318,6 +322,8 @@ struct iommu_ops {
 
 	int (*sva_unbind_gpasid)(struct device *dev, int pasid);
 
+	int (*dev_def_domain_type)(struct device *dev);
+
 	unsigned long pgsize_bitmap;
 	struct module *owner;
 };
-- 
2.17.1