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Re: [RFC PATCH V3 10/11] HV/Netvsc: Add Isolation VM support for netvsc driver
- To: Tianyu Lan <ltykernel@xxxxxxxxx>
- From: Christoph Hellwig <hch@xxxxxx>
- Date: Mon, 14 Jun 2021 09:09:03 +0200
- Cc: Christoph Hellwig <hch@xxxxxx>, kys@xxxxxxxxxxxxx, haiyangz@xxxxxxxxxxxxx, sthemmin@xxxxxxxxxxxxx, wei.liu@xxxxxxxxxx, decui@xxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, bp@xxxxxxxxx, x86@xxxxxxxxxx, hpa@xxxxxxxxx, arnd@xxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, luto@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, kirill.shutemov@xxxxxxxxxxxxxxx, rppt@xxxxxxxxxx, hannes@xxxxxxxxxxx, cai@xxxxxx, krish.sadhukhan@xxxxxxxxxx, saravanand@xxxxxx, Tianyu.Lan@xxxxxxxxxxxxx, konrad.wilk@xxxxxxxxxx, m.szyprowski@xxxxxxxxxxx, robin.murphy@xxxxxxx, boris.ostrovsky@xxxxxxxxxx, jgross@xxxxxxxx, sstabellini@xxxxxxxxxx, joro@xxxxxxxxxx, will@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, davem@xxxxxxxxxxxxx, kuba@xxxxxxxxxx, jejb@xxxxxxxxxxxxx, martin.petersen@xxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, vkuznets@xxxxxxxxxx, thomas.lendacky@xxxxxxx, brijesh.singh@xxxxxxx, sunilmut@xxxxxxxxxxxxx
- Delivery-date: Mon, 14 Jun 2021 07:09:16 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Mon, Jun 07, 2021 at 11:21:20PM +0800, Tianyu Lan wrote:
>> dma_map_single can only be used on page baked memory, and if this is
>> using page backed memory you wouldn't need to do thee phys_to_virt
>> tricks. Can someone explain the mess here in more detail?
>
> Sorry. Could you elaborate the issue? These pages in the pb array are not
> allocated by DMA API and using dma_map_single() here is to map these pages'
> address to bounce buffer physical address.
dma_map_single just calls dma_map_page using virt_to_page. So this
can't work on addresses not in the kernel linear mapping.
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