linux-kernel - Re: [PATCH v5 net-next] From: Petr Vandrovec <petr@...are.com>

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Message-ID: <YBIfhK1Kayf6kS62@lunn.ch>
Date:   Thu, 28 Jan 2021 03:20:52 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Ronak Doshi <doshir@...are.com>
Cc:     netdev@...r.kernel.org, Petr Vandrovec <petr@...are.com>,
        "maintainer:VMWARE VMXNET3 ETHERNET DRIVER" <pv-drivers@...are.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 net-next] From: Petr Vandrovec <petr@...are.com>

On Wed, Jan 27, 2021 at 06:08:16PM -0800, Ronak Doshi wrote:
> buf_info structures in RX & TX queues are private driver data that
> do not need to be visible to the device.  Although there is physical
> address and length in the queue descriptor that points to these
> structures, their layout is not standardized, and device never looks
> at them.
> 
> So lets allocate these structures in non-DMA-able memory, and fill
> physical address as all-ones and length as zero in the queue
> descriptor.
> 
> That should alleviate worries brought by Martin Radev in
> https://lists.osuosl.org/pipermail/intel-wired-lan/Week-of-Mon-20210104/022829.html
> that malicious vmxnet3 device could subvert SVM/TDX guarantees.
> 
> Signed-off-by: Petr Vandrovec <petr@...are.com>
> Signed-off-by: Ronak Doshi <doshir@...are.com>

Hi Ronak

The Subject line is still messed up, it contains Petr name rather than
a subject.

	Andrew