linux-kernel - [PATCH v1 3/4] vfio: Add VFIO_DMA_MAP_FLAG_SYS_CACHE to control device access to system cache

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Message-ID: <20240826071641.2691374-4-manojvishy@google.com>
Date: Mon, 26 Aug 2024 07:16:40 +0000
From: Manoj Vishwanathan <manojvishy@...gle.com>
To: Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>, 
	Joerg Roedel <joro@...tes.org>, Alex Williamson <alex.williamson@...hat.com>, 
	linux-arm-kernel@...ts.infradead.org
Cc: kvm@...r.kernel.org, iommu@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	David Dillow <dillow@...gle.com>, Manoj Vishwanathan <manojvishy@...gle.com>
Subject: [PATCH v1 3/4] vfio: Add VFIO_DMA_MAP_FLAG_SYS_CACHE to control
 device access to system cache

This new flag allows controlling whether a device buffers should be mapped to
sys cache for mapped DMA regions.

Signed-off-by: Manoj Vishwanathan <manojvishy@...gle.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 2b68e6cdf190..494611a046d3 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_SYS_CACHE (1 << 6)	/* Sys Cache able from device */
 	__u64	vaddr;				/* Process virtual address */
 	__u64	iova;				/* IO virtual address */
 	__u64	size;				/* Size of mapping (bytes) */
-- 
2.46.0.295.g3b9ea8a38a-goog