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Re: [PATCH 3/5] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM
- To: Christoph Hellwig <hch@xxxxxx>
- From: Tianyu Lan <ltykernel@xxxxxxxxx>
- Date: Wed, 17 Nov 2021 22:00:08 +0800
- Cc: dave.hansen@xxxxxxxxxxxxxxx, luto@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, bp@xxxxxxxxx, x86@xxxxxxxxxx, hpa@xxxxxxxxx, jgross@xxxxxxxx, sstabellini@xxxxxxxxxx, boris.ostrovsky@xxxxxxxxxx, kys@xxxxxxxxxxxxx, haiyangz@xxxxxxxxxxxxx, sthemmin@xxxxxxxxxxxxx, wei.liu@xxxxxxxxxx, decui@xxxxxxxxxxxxx, joro@xxxxxxxxxx, will@xxxxxxxxxx, davem@xxxxxxxxxxxxx, kuba@xxxxxxxxxx, jejb@xxxxxxxxxxxxx, martin.petersen@xxxxxxxxxx, m.szyprowski@xxxxxxxxxxx, robin.murphy@xxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, michael.h.kelley@xxxxxxxxxxxxx, Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, vkuznets@xxxxxxxxxx, brijesh.singh@xxxxxxx, konrad.wilk@xxxxxxxxxx, parri.andrea@xxxxxxxxx, thomas.lendacky@xxxxxxx, dave.hansen@xxxxxxxxx
- Delivery-date: Wed, 17 Nov 2021 14:00:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11/17/2021 6:01 PM, Christoph Hellwig wrote:
This doesn't really have much to do with normal DMA mapping,
so why does this direct through the dma ops?
According to the previous discussion, dma_alloc_noncontigous()
and dma_vmap_noncontiguous() may be used to handle the noncontigous
memory alloc/map in the netvsc driver. So add alloc/free and vmap/vunmap
callbacks here to handle the case. The previous patch v4 & v5 handles
the allocation and map in the netvsc driver. If this should not go
though dma ops, We also may make it as vmbus specific function and keep
the function in the vmbus driver.
https://lkml.org/lkml/2021/9/28/51
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