From: Jason Gunthorpe <jgg@nvidia.com>
To: liulongfang <liulongfang@huawei.com>
Cc: Alex Williamson <alex.williamson@redhat.com>,
cohuck@redhat.com, linux-kernel@vger.kernel.org,
linuxarm@openeuler.org
Subject: Re: [RFC PATCH 2/3] vfio/hisilicon: register the driver to vfio
Date: Thu, 13 May 2021 10:44:22 -0300 [thread overview]
Message-ID: <20210513134422.GD1002214@nvidia.com> (raw)
In-Reply-To: <3eaa3114-81b6-1bd9-c7e6-cb1541389b58@huawei.com>
On Thu, May 13, 2021 at 10:08:28AM +0800, liulongfang wrote:
> On 2021/5/12 20:10, Jason Gunthorpe wrote:
> > 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
> > .
> >
> This secure BAR area is not presented to the Guest,
> which makes it impossible for the Guest to obtain the secure BAR area
> when establishing the DMA mapping of the configuration space.
> If the DMA controller accesses the secure BAR area, the access will
> be blocked by the SMMU.
There are scenarios where this is not true.
At a minimum the mdev driver should refuse to work in those cases.
Jason
next prev parent reply other threads:[~2021-05-13 13:44 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-13 3:36 [RFC PATCH 0/3] vfio/hisilicon: add acc live migration driver Longfang Liu
2021-04-13 3:36 ` [RFC PATCH 1/3] " Longfang Liu
2021-04-13 3:36 ` [RFC PATCH 2/3] vfio/hisilicon: register the driver to vfio Longfang Liu
2021-04-15 22:01 ` Jason Gunthorpe
2021-04-19 12:24 ` liulongfang
2021-04-19 12:33 ` Jason Gunthorpe
2021-04-20 12:50 ` liulongfang
2021-04-20 12:59 ` Jason Gunthorpe
2021-04-20 13:28 ` liulongfang
2021-04-20 14:55 ` Jason Gunthorpe
2021-04-20 22:04 ` Alex Williamson
2021-04-20 23:18 ` Jason Gunthorpe
2021-04-21 9:59 ` liulongfang
2021-04-21 9:59 ` liulongfang
2021-04-21 18:12 ` Alex Williamson
2021-04-26 11:49 ` liulongfang
2021-05-12 8:39 ` liulongfang
2021-05-12 12:10 ` Jason Gunthorpe
2021-05-13 2:08 ` liulongfang
2021-05-13 13:44 ` Jason Gunthorpe [this message]
2021-05-13 15:49 ` [Linuxarm] " Shameerali Kolothum Thodi
2021-05-13 17:03 ` Alex Williamson
2021-05-13 17:52 ` Shameerali Kolothum Thodi
2021-05-13 18:22 ` Alex Williamson
2021-05-13 18:31 ` Shameerali Kolothum Thodi
2021-05-13 18:34 ` Jason Gunthorpe
2021-05-13 18:24 ` Jason Gunthorpe
2021-05-13 18:35 ` Shameerali Kolothum Thodi
2021-05-27 10:11 ` Shameerali Kolothum Thodi
2021-05-27 10:30 ` Max Gurtovoy
2021-04-13 3:36 ` [RFC PATCH 3/3] vfio/hisilicom: add debugfs for driver Longfang Liu
2021-04-15 21:35 ` [RFC PATCH 0/3] vfio/hisilicon: add acc live migration driver Alex Williamson
-- strict thread matches above, loose matches on Subject: below --
2021-04-13 1:20 [RFC PATCH v3 " Longfang Liu
2021-04-13 1:20 ` [RFC PATCH 2/3] vfio/hisilicon: register the driver to vfio Longfang Liu
2021-04-12 8:53 [RFC PATCH v3 0/3] vfio/hisilicon: add acc live migration driver Longfang Liu
2021-04-12 8:53 ` [RFC PATCH 2/3] vfio/hisilicon: register the driver to vfio Longfang Liu
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