On Wed, 5 Feb 2014, Paolo Bonzini wrote: > Il 05/02/2014 17:41, Stefano Stabellini ha scritto: > > > Yeah, especially because nowadays "-M pc" works with Xen. It would be > > nice if > > > fw_cfg could be enabled even for Xen on all machines except the legacy "-M > > > xenfv". > > > > > > Stefano, could you give it a shot now that you'll be soon done with 4.4? > > > > It might not be that straightforward as Xen emulates some devices in the > > hypervisor and patches have been recently posted to support multiple > > device models for a single VM. > > I'm not sure how this is related to fw_cfg? fw_cfg is just a simple key-value > store. If hvmloader doesn't use it, it should be a burden.
I was referring to the fact that QEMU might not have all the info that need to be written to fw_cfg when running on Xen: some of the info might be in the hypervisor and some other in another QEMU instance. Or do you think that fw_cfg could be written by multiple entities simultaneously?