linux-kernel - [PATCH v1 4/4] vfio/type1: Add support for VFIO_DMA_MAP_FLAG_SYS

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Message-ID: <20240826071641.2691374-5-manojvishy@google.com>
Date: Mon, 26 Aug 2024 07:16:41 +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 4/4] vfio/type1: Add support for VFIO_DMA_MAP_FLAG_SYS_CACHE

Introducing the VFIO_DMA_MAP_FLAG_SYS_CACHE flag to control
whether mapped DMA regions are cached in the system cache.

Signed-off-by: Manoj Vishwanathan <manojvishy@...gle.com>
---
 drivers/vfio/vfio_iommu_type1.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 0960699e7554..c84bb6c8b12f 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1562,7 +1562,8 @@ static int vfio_dma_do_map(struct vfio_iommu *iommu,
 		prot |= IOMMU_WRITE;
 	if (map->flags & VFIO_DMA_MAP_FLAG_READ)
 		prot |= IOMMU_READ;
-
+	if (map->flags & VFIO_DMA_MAP_FLAG_SYS_CACHE)
+		prot |= IOMMU_SYS_CACHE;
 	if ((prot && set_vaddr) || (!prot && !set_vaddr))
 		return -EINVAL;
 
@@ -2815,7 +2816,7 @@ static int vfio_iommu_type1_map_dma(struct vfio_iommu *iommu,
 	struct vfio_iommu_type1_dma_map map;
 	unsigned long minsz;
 	uint32_t mask = VFIO_DMA_MAP_FLAG_READ | VFIO_DMA_MAP_FLAG_WRITE |
-			VFIO_DMA_MAP_FLAG_VADDR;
+			VFIO_DMA_MAP_FLAG_SYS_CACHE | VFIO_DMA_MAP_FLAG_VADDR;
 
 	minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
 
-- 
2.46.0.295.g3b9ea8a38a-goog