linux-kernel - [RFC PATCH 04/15] iommu: Add preserve iommu

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Message-ID: <20250928190624.3735830-5-skhawaja@google.com>
Date: Sun, 28 Sep 2025 19:06:12 +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>, 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, zhuyifei@...gle.com, 
	Chris Li <chrisl@...nel.org>, praan@...gle.com
Subject: [RFC PATCH 04/15] iommu: Add preserve iommu_domain op

Add an optional preserve iommu_domain op that can be implemented by the
iommu drivers to preserve the iommu domain.

Signed-off-by: Samiullah Khawaja <skhawaja@...gle.com>
---
 include/linux/iommu.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index d23d078f7c18..40801d8eac61 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -758,6 +758,8 @@ 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.
  */
 struct iommu_domain_ops {
 	int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
@@ -787,6 +789,7 @@ struct iommu_domain_ops {
 				  unsigned long quirks);
 
 	void (*free)(struct iommu_domain *domain);
+	int (*preserve)(struct iommu_domain *domain);
 };
 
 /**
-- 
2.51.0.536.g15c5d4f767-goog