linux-kernel - Re: [PATCH V1 6/6] arm/xen: Assign xen-grant DMA ops for xen-grant DMA devices

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Date:   Sat, 23 Apr 2022 09:42:18 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Oleksandr Tyshchenko <olekstysh@...il.com>
Cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Julien Grall <julien@....org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH V1 6/6] arm/xen: Assign xen-grant DMA ops for xen-grant
 DMA devices

On Fri, Apr 22, 2022 at 07:51:03PM +0300, Oleksandr Tyshchenko wrote:
>  static inline void xen_setup_dma_ops(struct device *dev)
>  {
>  #ifdef CONFIG_XEN
> -	if (xen_swiotlb_detect())
> +	if (arch_has_restricted_virtio_memory_access() &&
> +			xen_is_grant_dma_device(dev))
> +		xen_grant_setup_dma_ops(dev);
> +	else if (xen_swiotlb_detect())

I don't think that arch_has_restricted_virtio_memory_access
check should be there as it still is a bit of a layering violation.