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Re: [Xen-devel] [PATCH] Revert "swiotlb: remove SWIOTLB_MAP_ERROR"
- To: Julien Grall <julien.grall@xxxxxxx>
- From: Christoph Hellwig <hch@xxxxxx>
- Date: Fri, 8 Mar 2019 16:23:55 +0100
- Cc: Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxxxxx>, "open list:IOMMU DRIVERS" <iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Joerg Roedel <jroedel@xxxxxxx>, Christoph Hellwig <hch@xxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
- Delivery-date: Fri, 08 Mar 2019 15:24:09 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Tue, Mar 05, 2019 at 09:41:46AM +0000, Julien Grall wrote:
> On Xen, dma_addr_t will always be 64-bit while the phys_addr_t will depend
> on the MMU type. So we may have phys_addr_t smaller than dma_addr_t from
> the kernel point of view.
How can dma_addr_t on arm have value > 32-bit when physical
addresses are 32-bit only?
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