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

[Samiullah Khawaja]

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

Signed-off-by: Samiullah Khawaja <skhawaja@xxxxxxxxxx>
---
 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