linux-kernel - Re: [PATCH v7] vfio/cdx: add support for CDX bus

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Date:   Fri, 16 Jun 2023 14:08:11 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Nipun Gupta <nipun.gupta@....com>
Cc:     <jgg@...pe.ca>, <linux-kernel@...r.kernel.org>,
        <kvm@...r.kernel.org>, <masahiroy@...nel.org>, <nathan@...nel.org>,
        <ndesaulniers@...gle.com>, <nicolas@...sle.eu>, <git@....com>,
        <harpreet.anand@....com>, <pieter.jansen-van-vuuren@....com>,
        <nikhil.agarwal@....com>, <michal.simek@....com>
Subject: Re: [PATCH v7] vfio/cdx: add support for CDX bus

On Wed, 31 May 2023 18:15:57 +0530
Nipun Gupta <nipun.gupta@....com> wrote:

> vfio-cdx driver enables IOCTLs for user space to query
> MMIO regions for CDX devices and mmap them. This change
> also adds support for reset of CDX devices. With VFIO
> enabled on CDX devices, user-space applications can also
> exercise DMA securely via IOMMU on these devices.
> 
> This change adds the VFIO CDX driver and enables the following
> ioctls for CDX devices:
>  - VFIO_DEVICE_GET_INFO:
>  - VFIO_DEVICE_GET_REGION_INFO
>  - VFIO_DEVICE_RESET
> 
> Signed-off-by: Nipun Gupta <nipun.gupta@....com>
> Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@....com>
> Tested-by: Nikhil Agarwal <nikhil.agarwal@....com>
> ---
> 
> Changed to support driver managed dma in CDX bus has been
> submitted at:
> https://lore.kernel.org/lkml/20230117134139.1298-1-nipun.gupta@amd.com/T/
> 
> Changes v6->v7:
> - updated GFP_KERNEL to GFP_KERNEL_ACCOUNT in kcalloc
> - remove redundant error condition
> - updated return codes

Applied to vfio next branch for v6.5.  Thanks,

Alex