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
> 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
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).
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