Re: [Libvir] PATCH: Specify BIOS clock offset for HVM

On Fri, Jul 13, 2007 at 05:07:03PM +0100, Daniel P. Berrange wrote: > The attached patch introduces a new XML element for specifying information > about the guest (BIOS) clock. For Xen HVM, and QEMU / KVM guests this is > used to specifyc whether the guest clock should be in UTC, or localtime. > The latter is useful for Windows which likes the BIOS to be localtime, > while the former is useful for all other operating systems. The former is > of course the default - so no change in existing semantics. > > The <clock> element currently takes a single attribute 'offset'. This is > either 'utc' or 'localtime', but if we port to VMWare, it will also allow > an arbitrary numeric offset as well as these special constants. > > <clock offset='utc'/> > > Or > > <clock offset='localtime'/> > > > It may later also be desirable to add a 'sync=[yes|no]' attribute to > specify whether the HV tries to keep the clock in sync with the HV while > it is running. VMWare has this concept, and so does Xen paravirt - though > Xen paravirt sets it via /proc/sys/xen/independant_wallclock inside the > guest and AFAICT doesn't (yet) expose it to the guest config in Dom0. > > Anyway, my patch implements use of utc/localtime offsets for Xen, and QEMU > drivers. I've tested to verify that -localtime gets passed to the QEMU > process as appropriate. Looks fine, the patch also includes a few cleanups. And this should fix the clock annoyance when running Windows. I assume this will be automatically added when installing a new Windows guest with virt-manager.