Re: FreeBSD PVH guest support

On 28/10/13 14:35, Roger Pau Monné wrote:
> Hello,
> 
> The Xen community is working on a new virtualization mode (or maybe I 
> should say an extension of HVM) to be able to run PV guests inside HVM 
> containers without requiring a device-model (Qemu). One of the 
> advantages of this new virtualization mode is that now it is much more 
> easier to port guests to run under it (as compared to pure PV guests).
> 
> Given that FreeBSD already supports PVHVM, adding PVH support is quite 
> easy, we only need some glue for the PV entry point and then support 
> for diverging some early init functions (like fetching the e820 map or 
> starting the APs).
> 
> The attached patch contains all this changes, and allows a SMP FreeBSD 
> guest to fully boot (and AFAIK work) under this new PVH mode. The patch 
> can also be found on my git repo:
> 
> git://xenbits.xen.org/people/royger/freebsd.git pvh_v2
> 
> The patch touches quite a lot of the early init, so I've Cced the 
> persons that maintain those areas, so they can review it.
> 
> In order to test it, and since the PVH changes are not yet merged into 
> upstream Xen, the use of a patched Xen is necessary. I've collected the 
> patches for PVH guest support from George Dunlap (v13) and fixed some 
> bugs on top of them, the tree can be found at:
> 
> git://xenbits.xen.org/people/royger/xen.git fix_pvh

I've updated the patch (as suggested by John Baldwin) and added a Xen
Nexus, that attaches all the Xen top-level devices, this gets rid of the
legacy bus.

The new patch can be found at:

git://xenbits.xen.org/people/royger/freebsd.git pvh_v2

And also attached on this email.

Thanks for the review, Roger.