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arm/xen: Assign xen-grant DMA ops for xen-grant DMA devices

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By assigning xen-grant DMA ops we will restrict memory access for
passed device using Xen grant mappings. This is needed for using any
virtualized device (e.g. virtio) in Xen guests in a safe manner.

Please note, for the virtio devices the XEN_VIRTIO config should
be enabled (it forces ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS).

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Link: https://lore.kernel.org/r/1654197833-25362-9-git-send-email-olekstysh@gmail.com
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Oleksandr Tyshchenko 2022-06-02 22:23:53 +03:00 committed by Juergen Gross
parent 625ab90ecd
commit fea981610c
1 changed files with 4 additions and 1 deletions
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5
include/xen/arm/xen-ops.h
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@ -3,11 +3,14 @@
#define _ASM_ARM_XEN_OPS_H #define _ASM_ARM_XEN_OPS_H
#include <xen/swiotlb-xen.h> #include <xen/swiotlb-xen.h>
#include <xen/xen-ops.h>
static inline void xen_setup_dma_ops(struct device *dev) static inline void xen_setup_dma_ops(struct device *dev)
{ {
#ifdef CONFIG_XEN #ifdef CONFIG_XEN
if (xen_swiotlb_detect()) if (xen_is_grant_dma_device(dev))
xen_grant_setup_dma_ops(dev);
else if (xen_swiotlb_detect())
dev->dma_ops = &xen_swiotlb_dma_ops; dev->dma_ops = &xen_swiotlb_dma_ops;
#endif #endif
} }