From: Muli Ben-Yehuda <muli@il.ibm.com>
To: Avi Kivity <avi@redhat.com>
Cc: Anthony Liguori <anthony@codemonkey.ws>,
kvm@vger.kernel.org, Amit Shah <amit.shah@redhat.com>,
"Kay, Allen M" <allen.m.kay@Intel.Com>,
Ben-Ami Yassour1 <BENAMI@il.ibm.com>
Subject: Re: [PATCH] VT-d: Fix iommu map page for mmio pages
Date: Sun, 28 Sep 2008 09:07:53 +0300 [thread overview]
Message-ID: <20080928060753.GD7239@il.ibm.com> (raw)
In-Reply-To: <48DE09DF.2050400@redhat.com>
On Sat, Sep 27, 2008 at 01:24:31PM +0300, Avi Kivity wrote:
>> I strongly disagree. You are advocating something that is
>> potentially unsafe---for the sake of code simplicity?! I am
>> advocating caution in what we let an *untrusted* guest do.
>
> Why would it be unsafe?
Because on at least one machine letting a device DMA to the same
address as another device's MMIO region caused the machine to reboot.
Cheers,
Muli
--
The First Workshop on I/O Virtualization (WIOV '08)
Dec 2008, San Diego, CA, http://www.usenix.org/wiov08/
xxx
SYSTOR 2009---The Israeli Experimental Systems Conference
http://www.haifa.il.ibm.com/conferences/systor2009/
next prev parent reply other threads:[~2008-09-28 6:08 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-19 7:15 [PATCH] VT-d: Fix iommu map page for mmio pages Han, Weidong
2008-09-25 10:27 ` Avi Kivity
2008-09-25 13:44 ` Han, Weidong
2008-09-25 13:58 ` Avi Kivity
2008-09-25 14:07 ` Han, Weidong
2008-09-25 14:45 ` Avi Kivity
2008-09-25 15:04 ` Anthony Liguori
2008-09-25 15:19 ` Han, Weidong
2008-09-25 21:14 ` Muli Ben-Yehuda
2008-09-25 21:51 ` Anthony Liguori
2008-09-26 23:57 ` Muli Ben-Yehuda
2008-09-27 10:24 ` Avi Kivity
2008-09-28 6:07 ` Muli Ben-Yehuda [this message]
2008-09-28 8:45 ` Avi Kivity
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