[RFC PATCH 1/4] dma: Add DMA allocation preservation KHO ABI

[Samiullah Khawaja <skhawaja@google.com>]

The DMA allocations can be backed by a variety of allocators. Add KHO
ABI for the preservation of contiguous allocations that are done through
dma-direct.

Signed-off-by: Samiullah Khawaja <skhawaja@google.com>
---
 include/linux/kho/abi/dma_alloc.h | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 include/linux/kho/abi/dma_alloc.h

diff --git a/include/linux/kho/abi/dma_alloc.h b/include/linux/kho/abi/dma_alloc.h
new file mode 100644
index 000000000000..46e61db81abe
--- /dev/null
+++ b/include/linux/kho/abi/dma_alloc.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_KHO_ABI_DMA_ALLOC_H
+#define _LINUX_KHO_ABI_DMA_ALLOC_H
+
+#include <linux/types.h>
+
+/**
+ * DOC: DMA Alloc ABI
+ *
+ * This header defines the structures used to serialize the state of DMA
+ * allocations, done by device driver, across a Live Update.
+ *
+ * Only DMA allocations done through dma-direct that are contiguous and
+ * allocated using alloc_page are supported.
+ */
+
+/**
+ * struct dma_alloc_ser - Serialized state of a single DMA allocation
+ * @page_phys: Physical address of the preserved pages
+ * @size: Size of the DMA allocation
+ * @force_decrypted: Whether the memory is force decrypted in previous kernel
+ */
+struct dma_alloc_ser {
+	u64 page_phys;
+	u64 size;
+	u8 force_decrypted;
+	u8 padding[7];
+} __packed;
+
+#endif /* _LINUX_KHO_ABI_DMA_ALLOC_H */
-- 
2.54.0.545.g6539524ca2-goog