DragonFly kernel List (threaded) for 2013-04
Re: [GSOC] Implement hardware nested page table support for vkernels
On 04/28/13 03:28, Mihai Carabas wrote:
> Here is my official application for GSoC 2013  (it's public). Any comments/reviews are welcome.
- Probably a basic introductory paragraph r.e. what a vkernel actually is might be useful
to set context. Ditto r.e. references to the vmspace() api. I've not worked with GSOC
people, so maybe this is a bad suggestion - Justin probably has more to say about this :D
- When I had pointed out v3vee/bhyve I had confused 'nested page tables'
w/ 'virtualization extensions', thinking you were planning on extending vkernel
to use vt-x. Using NPT directly from the host as a virtualization assist is pretty
nifty actually and might actually be something novel on x86 (not sure if LxC or
Solaris Zones, yadda are using these) In any event - apologies for any
- One of the bottlenecks in the current vkernel implementation is for IO -
Previous VKernel internals used virtual-upcalls to manage IO, which IIRC is now
done through a host-side dedicated IO pthread. Time / interest permitting,
it might be worthwhile to review if NPT and some kind of host:guest
cooperation could also be beneficial for IO in addition to memory,
and also if the now-present support for 'virtio' could be
leveraged in some manner here (I'm not up on how virtio works).
But that could easily be a 'follow up project'
Cheers & Good Luck!