Re: [PATCH v5 4/7] iommu/vt-d: Use pci_real_dma_dev() for mapping

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Subject: Re: [PATCH v5 4/7] iommu/vt-d: Use pci_real_dma_dev() for mapping
From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Date: Wed, 22 Jan 2020 12:37:32 +0800
Cc: baolu.lu@xxxxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, Christoph Hellwig <hch@xxxxxx>, Keith Busch <kbusch@xxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, David Woodhouse <dwmw2@xxxxxxxxxxxxx>
In-reply-to: <1579613871-301529-5-git-send-email-jonathan.derrick@intel.com>
References: <1579613871-301529-1-git-send-email-jonathan.derrick@intel.com> <1579613871-301529-5-git-send-email-jonathan.derrick@intel.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2

On 1/21/20 9:37 PM, Jon Derrick wrote:

The PCI device may have a DMA requester on another bus, such as VMD
subdevices needing to use the VMD endpoint. This case requires the real
DMA device when mapping to IOMMU.

Signed-off-by: Jon Derrick<jonathan.derrick@xxxxxxxxx>


Acked-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

Thanks,
baolu

References:
- [PATCH v5 0/7] Clean up VMD DMA Map Ops
  - From: Jon Derrick
- [PATCH v5 4/7] iommu/vt-d: Use pci_real_dma_dev() for mapping
  - From: Jon Derrick

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