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Re: [PATCH v5 13/20] vfio/ap: Allow the selection of a given iommu backe
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From: |
Matthew Rosato |
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Subject: |
Re: [PATCH v5 13/20] vfio/ap: Allow the selection of a given iommu backend |
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Date: |
Thu, 9 Nov 2023 17:57:45 -0500 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.15.1 |
On 11/9/23 6:45 AM, Zhenzhong Duan wrote:
> Now we support two types of iommu backends, let's add the capability
> to select one of them. This depends on whether an iommufd object has
> been linked with the vfio-ap device:
>
> if the user wants to use the legacy backend, it shall not
> link the vfio-ap device with any iommufd object:
>
> -device vfio-ap,sysfsdev=/sys/bus/mdev/devices/XXX
>
> This is called the legacy mode/backend.
>
> If the user wants to use the iommufd backend (/dev/iommu) it
> shall pass an iommufd object id in the vfio-ap device options:
>
> -object iommufd,id=iommufd0
> -device vfio-ap,sysfsdev=/sys/bus/mdev/devices/XXX,iommufd=iommufd0
>
> Suggested-by: Alex Williamson <alex.williamson@redhat.com>
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>