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: 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>
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#define _ASM_ARM_XEN_OPS_H
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#define _ASM_ARM_XEN_OPS_H
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#include <xen/swiotlb-xen.h>
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#include <xen/swiotlb-xen.h>
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#include <xen/xen-ops.h>
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static inline void xen_setup_dma_ops(struct device *dev)
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static inline void xen_setup_dma_ops(struct device *dev)
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{
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{
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#ifdef CONFIG_XEN
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#ifdef CONFIG_XEN
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if (xen_swiotlb_detect())
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if (xen_is_grant_dma_device(dev))
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xen_grant_setup_dma_ops(dev);
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else if (xen_swiotlb_detect())
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dev->dma_ops = &xen_swiotlb_dma_ops;
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dev->dma_ops = &xen_swiotlb_dma_ops;
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#endif
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#endif
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}
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}
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