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path: root/drivers/virtio/virtio_ring.c
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Diffstat (limited to 'drivers/virtio/virtio_ring.c')
-rw-r--r--drivers/virtio/virtio_ring.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index af16a7e8c67e..2e7689bb933b 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -11,6 +11,7 @@
#include <linux/module.h>
#include <linux/hrtimer.h>
#include <linux/dma-mapping.h>
+#include <linux/kmsan.h>
#include <linux/spinlock.h>
#include <xen/xen.h>
@@ -352,8 +353,15 @@ static dma_addr_t vring_map_one_sg(const struct vring_virtqueue *vq,
struct scatterlist *sg,
enum dma_data_direction direction)
{
- if (!vq->use_dma_api)
+ if (!vq->use_dma_api) {
+ /*
+ * If DMA is not used, KMSAN doesn't know that the scatterlist
+ * is initialized by the hardware. Explicitly check/unpoison it
+ * depending on the direction.
+ */
+ kmsan_handle_dma(sg_page(sg), sg->offset, sg->length, direction);
return (dma_addr_t)sg_phys(sg);
+ }
/*
* We can't use dma_map_sg, because we don't use scatterlists in