linux-kernel - Re: + stupid-hack-to-make-mainline-build.patch added to -mm tree

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Message-ID: <45F06989.8030207@goop.org>
Date:	Thu, 08 Mar 2007 11:52:41 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Chris Wright <chrisw@...s-sol.org>
CC:	Daniel Arai <arai@...are.com>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	akpm@...ux-foundation.org, john stultz <johnstul@...ibm.com>,
	tglx@...utronix.de, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: + stupid-hack-to-make-mainline-build.patch added to -mm tree

Chris Wright wrote:
> I agree with that, but I think that's esp. for things like create and launch
> new vcpu.  The IPI bit I'm not as clear on, nor running this all on native
> as well.
>   

Well, native would fall back to using the existing arch/i386 versions of
those functions, so that's reasonably straightforward.  There'll need to
be a bit of internal rearrangement so that the Xen code can call in to
do things like set up the pda/gdt and other bits of CPU state.

I don't think IPI is especially interesting in itself, is it?   It's a
necessary mechanism to implement smp_call_function(), but Xen can do IPI
without having to invoke any of the existing apic-based IPI code.  The
other main user of IPI is cross-cpu tlb shootdown, but Xen has much more
efficient mechanisms than IPI for that (so we'll need to make the tlb
pv_ops interface a little wider to pass down a cpuset).

    J
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