From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.fraser@eu.citrix.com>
Subject: Re: Critical bug: VT-d fault causes disk corruption
	orDom0 kernel panic.
Date: Thu, 22 Jan 2009 09:47:45 +0000
Message-ID: <C59DF141.21B60%keir.fraser@eu.citrix.com>
References: <66C97C757FFC56takebe_akio@jp.fujitsu.com>
Mime-Version: 1.0
Content-Type: text/plain;
	charset="US-ASCII"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xensource.com>
In-Reply-To: <66C97C757FFC56takebe_akio@jp.fujitsu.com>
List-Unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: Akio Takebe <takebe_akio@jp.fujitsu.com>, "Li, Xin" <xin.li@intel.com>, "Li, Haicheng" <haicheng.li@intel.com>, "'xen-devel@lists.xensource.com'" <xen-devel@lists.xensource.com>
List-Id: xen-devel@lists.xenproject.org

On 22/01/2009 09:40, "Akio Takebe" <takebe_akio@jp.fujitsu.com> wrote:

> Is compute_dom0_nr_pages() OK?
> The number of available pages seems to be increase.
> What do you think?

Now that the heaps are unified, the old Xen heap pages are visible to dom0
and available to be allocated. Is this a problem? Probably not since we
already by default prevent dom0 from allocating all memory up front. There
are similar concerns regarding the auto-ballooner by the way, which are more
likely to need addressing. If you run with dom0_mem= and no auto-ballooner
then there is no worry at all.

Btw these concerns should have nothing to do with the reported VT-d faults.

 -- Keir