[dpdk-dev] Having troubles binding an SR-IOV VF to uio_pci_generic on Amazon instance
Michael S. Tsirkin
mst at redhat.com
Thu Oct 1 17:40:49 CEST 2015
On Thu, Oct 01, 2015 at 06:19:33PM +0300, Avi Kivity wrote:
> On 10/01/2015 06:11 PM, Michael S. Tsirkin wrote:
> >On Thu, Oct 01, 2015 at 02:32:19PM +0300, Avi Kivity wrote:
> >>> We already agreed this kernel
> >>>is going to be tainted, and unsupportable.
> >>Yes. So your only motivation in rejecting the patch is to get the author to
> >>write the ring translation patch and port it to all relevant drivers
> >>instead?
> >Not only that.
> >
> >To make sure users are aware they are doing insecure
> >things when using software poking at device BARs in sysfs.
>
> I don't think you need to worry about that. People who program DMA are
> aware of the damage is can cause.
People just install software and run it. They don't program DMA.
And I notice that no software (ab)using this seems to come with
documentation explaining the implications.
> If you want to be extra sure, have uio
> taint the kernel when bus mastering is enabled.
People don't notice kernel is tainted. Denying module load will make
them notice.
--
MST
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