From: Keir Fraser <keir.fraser@eu.citrix.com>
To: Joanna Rutkowska <joanna@invisiblethingslab.com>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: pciback: question about the permissive flag
Date: Wed, 7 Jul 2010 07:32:12 +0100 [thread overview]
Message-ID: <C859DDFC.1996A%keir.fraser@eu.citrix.com> (raw)
In-Reply-To: <4C33A217.3050006@invisiblethingslab.com>
On 06/07/2010 22:37, "Joanna Rutkowska" <joanna@invisiblethingslab.com>
wrote:
> So, what am I missing here?
I think the fear was that there could be class- or device-specific config
registers that we wouldn't know how to handle, and which could have
unexpected effects if they are passed through naively. Concrete examples
were never given, and this was all pre-vtd so as you say pass-through of a
DMA-capable device was insecure anyway. I've always thought the permissive
flag stuff was pretty useless, and I always suggest people to enable the
permissive flag.
-- Keir
next prev parent reply other threads:[~2010-07-07 6:32 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-06 21:37 pciback: question about the permissive flag Joanna Rutkowska
2010-07-07 6:32 ` Keir Fraser [this message]
2010-07-07 13:30 ` Ian Pratt
2010-07-07 14:05 ` Joanna Rutkowska
2010-07-07 15:28 ` Konrad Rzeszutek Wilk
2010-07-07 15:44 ` Ian Pratt
2010-07-07 21:41 ` Joanna Rutkowska
2010-07-07 22:51 ` Ian Pratt
2010-07-07 15:18 ` Konrad Rzeszutek Wilk
2010-07-07 21:23 ` Joanna Rutkowska
2010-07-09 14:09 ` Konrad Rzeszutek Wilk
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