Re: [Resend RFC PATCH V2 08/12] UIO/Hyper-V: Not load UIO HV driver in the isolation VM.

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To: Tianyu Lan <ltykernel@xxxxxxxxx>
Subject: Re: [Resend RFC PATCH V2 08/12] UIO/Hyper-V: Not load UIO HV driver in the isolation VM.
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 14 Apr 2021 17:42:32 +0200
Cc: kys@xxxxxxxxxxxxx, haiyangz@xxxxxxxxxxxxx, sthemmin@xxxxxxxxxxxxx, wei.liu@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, bp@xxxxxxxxx, x86@xxxxxxxxxx, hpa@xxxxxxxxx, arnd@xxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, konrad.wilk@xxxxxxxxxx, hch@xxxxxx, m.szyprowski@xxxxxxxxxxx, robin.murphy@xxxxxxx, joro@xxxxxxxxxx, will@xxxxxxxxxx, davem@xxxxxxxxxxxxx, kuba@xxxxxxxxxx, jejb@xxxxxxxxxxxxx, martin.petersen@xxxxxxxxxx, Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, vkuznets@xxxxxxxxxx, thomas.lendacky@xxxxxxx, brijesh.singh@xxxxxxx, sunilmut@xxxxxxxxxxxxx
In-reply-to: <20210414144945.3460554-9-ltykernel@gmail.com>
References: <20210414144945.3460554-1-ltykernel@gmail.com> <20210414144945.3460554-9-ltykernel@gmail.com>
User-agent: Mutt/1.5.17 (2007-11-01)

On Wed, Apr 14, 2021 at 10:49:41AM -0400, Tianyu Lan wrote:
> From: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>
> 
> UIO HV driver should not load in the isolation VM for security reason.
> Return ENOTSUPP in the hv_uio_probe() in the isolation VM.

What is the "security reason"?  After all a user can simply patch the
code and just load it anyway..

References:
- [Resend RFC PATCH V2 00/12] x86/Hyper-V: Add Hyper-V Isolation VM support
  - From: Tianyu Lan
- [Resend RFC PATCH V2 08/12] UIO/Hyper-V: Not load UIO HV driver in the isolation VM.
  - From: Tianyu Lan

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