I have two questions about xen. Hope I can find answers/hints in this mailing list. 1. how PV and HVM know about what physical devices are in the PC? 2. If a USB disk is plugged in, how does xen notify this to PV and HVM so that the guest domains can do things as there were no virtualization layer. Best regards, Hu Jia Yi Ext: 20430 Tel: 65-67510430 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
On Wed, Sep 05, 2007 at 02:13:58PM +0800, Hu Jia Yi wrote:> I have two questions about xen. Hope I can find answers/hints in this > mailing list. > > 1. how PV and HVM know about what physical devices are in the PC?They typically don''t know anything about physical hardware. Normal practice is to only assign virtual devices to guests - virtual network / disk or sound & USB devices are most common (the latter two for HVM only).> 2. If a USB disk is plugged in, how does xen notify this to PV and HVM > so that the guest domains can do things as there were no virtualization > layer.Xen doesn''t do anything when USB disks are plugged in. It is possible use admin tools to explicitly map a USB disk through to a guest as a virtual disk, or in HVM case to hand-off the entire USB device to the guest. This is a manual admin config step though - nothing automatic occurrs. Dan. -- |=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496 -=| |=- Perl modules: http://search.cpan.org/~danberr/ -=| |=- Projects: http://freshmeat.net/~danielpb/ -=| |=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=| _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
May I know which source files I should read if I want to know how Xen assigns virtual devices to guest? I suspect "the asms file is needed" problem in installing winxp is because CD-rom is not assigned to winxp when the winxp HVM domain is restarted. Best regards, Hu Jia Yi Ext: 20430 Tel: 65-67510430 -----Original Message----- From: Daniel P. Berrange [mailto:berrange@redhat.com] Sent: Wednesday, September 05, 2007 11:43 PM To: Hu Jia Yi Cc: xen-devel@lists.xensource.com Subject: Re: [Xen-devel] Question: PV and HVM device list On Wed, Sep 05, 2007 at 02:13:58PM +0800, Hu Jia Yi wrote:> I have two questions about xen. Hope I can find answers/hints in this > mailing list. > > 1. how PV and HVM know about what physical devices are in the PC?They typically don''t know anything about physical hardware. Normal practice is to only assign virtual devices to guests - virtual network / disk or sound & USB devices are most common (the latter two for HVM only).> 2. If a USB disk is plugged in, how does xen notify this to PV and HVM > so that the guest domains can do things as there were novirtualization> layer.Xen doesn''t do anything when USB disks are plugged in. It is possible use admin tools to explicitly map a USB disk through to a guest as a virtual disk, or in HVM case to hand-off the entire USB device to the guest. This is a manual admin config step though - nothing automatic occurrs. 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=| _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel