linux-kernel - Re: [RFC PATCH 2/3] vfio/hisilicon: register the driver to vfio

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Message-ID: <20210512121053.GT1002214@nvidia.com>
Date:   Wed, 12 May 2021 09:10:53 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     liulongfang <liulongfang@...wei.com>
Cc:     Alex Williamson <alex.williamson@...hat.com>, cohuck@...hat.com,
        linux-kernel@...r.kernel.org, linuxarm@...neuler.org
Subject: Re: [RFC PATCH 2/3] vfio/hisilicon: register the driver to vfio

On Wed, May 12, 2021 at 04:39:43PM +0800, liulongfang wrote:

> Therefore, this method of limiting the length of the BAR
> configuration space can prevent unsafe operations of the memory.

The issue is DMA controlled by the guest accessing the secure BAR
area, not the guest CPU.

Jason