On 14/12/13 03:28, Colin Percival wrote: > On 12/13/13 18:23, Mason Loring Bliss wrote: >> I was psyched to see that GENERIC kernels in 10 have HVMXEN support by >> default, but then I was left a little confused. >> >> What's the different between a kernel with options XEN and one with options >> HVMXEN? > > The XEN option is for *paravirtualized* Xen -- aka. the original version, > before Intel and AMD added virtualization support into their CPUs. HVM > uses "hardware virtualization", but we also use PV drivers where available. > >> I'd love to be able to run FreeBSD domU systems without having to do >> a custom compile whenever there's an update. I've got a 9.1 system running >> now, using a copy of the XEN config with a couple tweaks, and I see all the >> PV drivers I expect. I'm wondering what's different with XENHVM... Also >> useful would be knowing if there are remaining differences between i386 and >> amd64 as a domU in FreeBSD 10. > > You want to switch to using HVM with PV devices. That should be a simple > tweak to your Xen configuration, and then you'll be able to use a GENERIC > kernel.
Just as a note, the support in GENERIC is not only HVM with PV devices, is basically a PV guest inside an HVM container, meaning it also uses PV IPIs and PV timers. The main difference between pure PV and PVHVM is that PV requires a PV MMU implementation in the OS, while PVHVM can use a hardware virtualized MMU (because it's running inside of a HVM container). Roger. _______________________________________________ freebsd-xen@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-xen To unsubscribe, send any mail to "freebsd-xen-unsubscr...@freebsd.org"
