linux-kernel - [PATCH v3 1/3] uapi/linux/vfio:Add VFIO_DMA_MAP_FLAG

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Message-ID: <20250121112836.525046-1-east.moutain.yang@gmail.com>
Date: Tue, 21 Jan 2025 19:28:34 +0800
From: Wencheng Yang <east.moutain.yang@...il.com>
To: east.moutain.yang@...il.com,
	alex.williamson@...hat.com,
	jgg@...pe.ca
Cc: iommu@...ts.linux.dev,
	joro@...tes.org,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	robin.murphy@....com,
	suravee.suthikulpanit@....com,
	will@...nel.org
Subject: [PATCH v3 1/3] uapi/linux/vfio:Add VFIO_DMA_MAP_FLAG_MMIO flag

The flag will be used by VFIO to map DMA for device MMIO on IOMMU page table.

Signed-off-by: Wencheng Yang <east.moutain.yang@...il.com>
---
 include/uapi/linux/vfio.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index c8dbf8219c4f..68002c8f1157 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -1560,6 +1560,7 @@ struct vfio_iommu_type1_dma_map {
 #define VFIO_DMA_MAP_FLAG_READ (1 << 0)		/* readable from device */
 #define VFIO_DMA_MAP_FLAG_WRITE (1 << 1)	/* writable from device */
 #define VFIO_DMA_MAP_FLAG_VADDR (1 << 2)
+#define VFIO_DMA_MAP_FLAG_MMIO (1 << 3)     /* map of mmio */
 	__u64	vaddr;				/* Process virtual address */
 	__u64	iova;				/* IO virtual address */
 	__u64	size;				/* Size of mapping (bytes) */
-- 
2.43.0