linux-kernel - RE: [PATCH v3 5/5] vfio/iommu_type1: Simplify group attachment

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Date:   Mon, 27 Jun 2022 06:57:30 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Nicolin Chen <nicolinc@...dia.com>,
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Subject: RE: [PATCH v3 5/5] vfio/iommu_type1: Simplify group attachment

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Friday, June 24, 2022 4:00 AM
> 
> Un-inline the domain specific logic from the attach/detach_group ops into
> two paired functions vfio_iommu_alloc_attach_domain() and
> vfio_iommu_detach_destroy_domain() that strictly deal with creating and
> destroying struct vfio_domains.
> 
> Add the logic to check for EMEDIUMTYPE return code of
> iommu_attach_group()
> and avoid the extra domain allocations and attach/detach sequences of the
> old code. This allows properly detecting an actual attach error, like
> -ENOMEM, vs treating all attach errors as an incompatible domain.
> 
> Co-developed-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>