Messages in this thread | | | Subject | Re: A proposal - binary | From | Rusty Russell <> | Date | Fri, 04 Aug 2006 18:29:14 +1000 |
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On Fri, 2006-08-04 at 00:21 -0700, Andrew Morton wrote: > On Fri, 04 Aug 2006 17:04:59 +1000 > Rusty Russell <rusty@rustcorp.com.au> wrote: > > > On Thu, 2006-08-03 at 22:53 -0700, Andrew Morton wrote: > > > VMI is being proposed as an appropriate way to connect Linux to Xen. If > > > that is true then no other glue is needed. > > > > Sorry, this is wrong. > > It's actually 100% correct.
Err, yes. I actually misrepresented VMI: the native implementation is inline (ie. no blob is required for native). Bad Rusty.
> > > > Yes, we could force native and Xen to work via VMI, but the result would > > > > be less clear, less maintainable, and gratuitously different from > > > > elsewhere in the kernel. > > > > > > I suspect others would disagree with that. We're at the stage of needing > > > to see code to settle this. > > > > Wrong again. > > I was referring to the VMI-for-Xen code.
I know. And I repeat, we don't have to see that part, to know that the result is less clear, less maintainable and gratuitously different from elsewhere in the kernel than the paravirt_ops approach. We've seen paravirt and the VMI parts of this already.
> > We've *seen* the code for VMI, and fairly hairy. > > I probably slept through that discussion - I don't recall that things were > that bad. Do you recall the Subject: or date?
Read the patches which Zach sent back in March, particularly:
[RFC, PATCH 3/24] i386 Vmi interface definition [RFC, PATCH 4/24] i386 Vmi inline implementation [RFC, PATCH 5/24] i386 Vmi code patching
If you want to hack on x86 arch code, you'd need to understand these.
Then to see the paravirt patches go to http://ozlabs.org/~rusty/paravirt and look at the approximately-equivalent paravirt_ops patches:
008-paravirt-structure.patch 009-binary-patch.patch
There's nothing in those paravirt_ops patches which will surprise any kernel hacker. That's my entire point: maintainable, unsurprising, clear.
Rusty. -- Help! Save Australia from the worst of the DMCA: http://linux.org.au/law
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