From: Manoj Vishwanathan <manojvishy@google.com>
To: Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Joerg Roedel <joro@8bytes.org>,
Alex Williamson <alex.williamson@redhat.com>,
linux-arm-kernel@lists.infradead.org
Cc: kvm@vger.kernel.org, iommu@lists.linux.dev,
linux-kernel@vger.kernel.org, David Dillow <dillow@google.com>,
Manoj Vishwanathan <manojvishy@google.com>
Subject: [PATCH v1 4/4] vfio/type1: Add support for VFIO_DMA_MAP_FLAG_SYS_CACHE
Date: Mon, 26 Aug 2024 07:16:41 +0000 [thread overview]
Message-ID: <20240826071641.2691374-5-manojvishy@google.com> (raw)
In-Reply-To: <20240826071641.2691374-1-manojvishy@google.com>
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@google.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
next prev parent reply other threads:[~2024-08-26 7:17 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-26 7:16 [PATCH v1 0/4] vfio/iommu: Flag to allow userspace to set DMA buffers system cacheable Manoj Vishwanathan
2024-08-26 7:16 ` [PATCH v1 1/4] iommu: Add IOMMU_SYS_CACHE flag for system cache control Manoj Vishwanathan
2024-08-26 7:16 ` [PATCH v1 2/4] iommu/io-pgtable-arm: Force outer cache for page-level MAIR via user flag Manoj Vishwanathan
2024-08-26 7:16 ` [PATCH v1 3/4] vfio: Add VFIO_DMA_MAP_FLAG_SYS_CACHE to control device access to system cache Manoj Vishwanathan
2024-08-26 7:16 ` Manoj Vishwanathan [this message]
2024-08-26 17:04 ` [PATCH v1 0/4] vfio/iommu: Flag to allow userspace to set DMA buffers system cacheable Alex Williamson
2024-08-26 17:36 ` Manoj Vishwanathan
2024-08-26 23:17 ` Jason Gunthorpe
2024-08-27 17:31 ` Robin Murphy
2024-08-28 2:55 ` Manoj Vishwanathan
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