linux-kernel - [RFC PATCH v2 10/32] iommu: Add iommu_domain ops to preserve, unpreserve and restore

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: <20251202230303.1017519-11-skhawaja@google.com>
Date: Tue,  2 Dec 2025 23:02:40 +0000
From: Samiullah Khawaja <skhawaja@...gle.com>
To: David Woodhouse <dwmw2@...radead.org>, Lu Baolu <baolu.lu@...ux.intel.com>, 
	Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>, 
	Pasha Tatashin <pasha.tatashin@...een.com>, Jason Gunthorpe <jgg@...pe.ca>, iommu@...ts.linux.dev
Cc: Samiullah Khawaja <skhawaja@...gle.com>, Robin Murphy <robin.murphy@....com>, 
	Pratyush Yadav <pratyush@...nel.org>, Kevin Tian <kevin.tian@...el.com>, 
	Alex Williamson <alex@...zbot.org>, linux-kernel@...r.kernel.org, 
	Saeed Mahameed <saeedm@...dia.com>, Adithya Jayachandran <ajayachandra@...dia.com>, 
	Parav Pandit <parav@...dia.com>, Leon Romanovsky <leonro@...dia.com>, William Tu <witu@...dia.com>, 
	Vipin Sharma <vipinsh@...gle.com>, dmatlack@...gle.com, YiFei Zhu <zhuyifei@...gle.com>, 
	Chris Li <chrisl@...nel.org>, praan@...gle.com
Subject: [RFC PATCH v2 10/32] iommu: Add iommu_domain ops to preserve,
 unpreserve and restore

These domain ops can be implemented by the iommu drivers if they support
iommu domain preservation across liveupdate.

Signed-off-by: Samiullah Khawaja <skhawaja@...gle.com>
---
 include/linux/iommu.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 8c66284a91a8..f681d4d27d6e 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -14,6 +14,7 @@
 #include <linux/err.h>
 #include <linux/of.h>
 #include <linux/iova_bitmap.h>
+#include <linux/kho/abi/iommu.h>
 #include <uapi/linux/iommufd.h>
 
 #define IOMMU_READ	(1 << 0)
@@ -749,6 +750,11 @@ struct iommu_ops {
  *                           specific mechanisms.
  * @set_pgtable_quirks: Set io page table quirks (IO_PGTABLE_QUIRK_*)
  * @free: Release the domain after use.
+ * @preserve: Preserve the iommu domain for liveupdate.
+ *            Returns 0 on success, a negative errno on failure.
+ * @unpreserve: Unpreserve the iommu domain that was preserved earlier.
+ * @restore: Restore the iommu domain after liveupdate.
+ *           Returns 0 on success, a negative errno on failure.
  */
 struct iommu_domain_ops {
 	int (*attach_dev)(struct iommu_domain *domain, struct device *dev,
@@ -779,6 +785,9 @@ struct iommu_domain_ops {
 				  unsigned long quirks);
 
 	void (*free)(struct iommu_domain *domain);
+	int (*preserve)(struct iommu_domain *domain, struct iommu_domain_ser *ser);
+	void (*unpreserve)(struct iommu_domain *domain, struct iommu_domain_ser *ser);
+	int (*restore)(struct iommu_domain *domain, struct iommu_domain_ser *ser);
 };
 
 /**
-- 
2.52.0.158.g65b55ccf14-goog