Commit fea98161 authored by Oleksandr Tyshchenko's avatar Oleksandr Tyshchenko Committed by Juergen Gross
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arm/xen: Assign xen-grant DMA ops for xen-grant DMA devices 



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: default avatarOleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Reviewed-by: default avatarStefano Stabellini <sstabellini@kernel.org>
Link: https://lore.kernel.org/r/1654197833-25362-9-git-send-email-olekstysh@gmail.com


Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
parent 625ab90e

include/xen/arm/xen-ops.h

+4 −1
Original line number Diff line number Diff line
@@ -3,11 +3,14 @@ 
#define _ASM_ARM_XEN_OPS_H



#include <xen/swiotlb-xen.h>

#include <xen/xen-ops.h>



static inline void xen_setup_dma_ops(struct device *dev)

{

#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;

#endif

}