From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Wright Subject: Re: VGA Passthrough crashes machine Date: Thu, 15 Dec 2011 15:54:00 +0000 Message-ID: <4EEA1818.6060106@overnetdata.com> References: <4EE0A6C7.9080603@overnetdata.com> <20111214213819.GD25896@andromeda.dapyr.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20111214213819.GD25896@andromeda.dapyr.net> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Konrad Rzeszutek Wilk Cc: "xen-devel@lists.xensource.com" List-Id: xen-devel@lists.xenproject.org On 14/12/2011 21:38, Konrad Rzeszutek Wilk wrote: > On Thu, Dec 08, 2011 at 12:00:07PM +0000, Anthony Wright wrote: >> I've just had my first attempt at getting VGA passthrough to work, and >> it crashed the machine. I'm trying to understand whether this is a >> problem with my hardware, configuration or a software problem. >> >> I'm running Xen 4.1.2 with Linux 3.1.2 >> >> >> The CPU is an Intel Core i5-650 >> http://ark.intel.com/products/43546/Intel-Core-i5-650-Processor-%284M-Cache-3_20-GHz%29 > And what is your motherboard? Does it have VT-d? That was the important question... I'd missed the BIOS option to enable VT-d which was disabled by default. I enabled the BIOS option and everything worked, and it's very cool. :-) This does beg a couple of other questions though.... Shouldn't I get a nice(ish) error message if I try to start a VGA passthrough VM on hardware that doesn't support it rather than crashing the machine? Can I tell whether hardware will support VGA passthrough without trying to start a VM that uses it? Also when I shut down the VM I have to use 'xl destroy' as I'm testing with Windows. After issuing the 'xl destroy' there is a long pause and then the error: libxl: error: libxl_device.c:470:libxl__wait_for_device_model Device Model not ready libxl: error: libxl_pci.c:892:do_pci_remove Device Model didn't respond in time If I pass through more than one device, I get the pause and the message for each device.