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

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Date:   Thu, 15 Apr 2021 20:54:04 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>,
        Greg KH <gregkh@...uxfoundation.org>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com, arnd@...db.de,
        akpm@...ux-foundation.org, konrad.wilk@...cle.com, hch@....de,
        m.szyprowski@...sung.com, robin.murphy@....com, joro@...tes.org,
        will@...nel.org, davem@...emloft.net, kuba@...nel.org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        iommu@...ts.linux-foundation.org, linux-arch@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-scsi@...r.kernel.org,
        netdev@...r.kernel.org, vkuznets@...hat.com,
        thomas.lendacky@....com, brijesh.singh@....com,
        sunilmut@...rosoft.com
Subject: Re: [Resend RFC PATCH V2 08/12] UIO/Hyper-V: Not load UIO HV driver
 in the isolation VM.

Hi Stephen:
	Thanks for your review.


On 4/15/2021 12:17 AM, Stephen Hemminger wrote:
> On Wed, 14 Apr 2021 17:45:51 +0200
> Greg KH <gregkh@...uxfoundation.org> wrote:
> 
>> On Wed, Apr 14, 2021 at 10:49:41AM -0400, Tianyu Lan wrote:
>>> From: Tianyu Lan <Tianyu.Lan@...rosoft.com>
>>>
>>> UIO HV driver should not load in the isolation VM for security reason.
>>> Return ENOTSUPP in the hv_uio_probe() in the isolation VM.
>>>
>>> Signed-off-by: Tianyu Lan <Tianyu.Lan@...rosoft.com>
> 
> This is debatable, in isolation VM's shouldn't userspace take responsibility
> to validate host communication. If that is an issue please participate with
> the DPDK community (main user of this) to make sure netvsc userspace driver
> has the required checks.
> 

Agree. Will report back to secure team and apply request to add change 
in userspace netvsc driver. Thanks for advise.