linux-kernel - Re: [kvm-devel] [PATCH 10/13] KVM: Wire up hypercall handlers to a central arch-independent location

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Message-Id: <1172149924.3531.260.camel@laptopd505.fenrus.org>
Date:	Thu, 22 Feb 2007 14:12:04 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Avi Kivity <avi@...ranet.com>
Cc:	Dor Laor <dor.laor@...ranet.com>, Pavel Machek <pavel@....cz>,
	kvm-devel@...ts.sourceforge.net, akpm@...l.org,
	linux-kernel@...r.kernel.org
Subject: Re: [kvm-devel] [PATCH 10/13] KVM: Wire up hypercall handlers to
	a	central arch-independent location


> Somthing else that came up in a conversation with Dor: the need for a 
> clean way to raise a guest interrupt.  The guest may be sleeping in 
> userspace, scheduled out, or running on another cpu (and requiring an 
> ipi to get it out of guest mode).

yeah it'd be nice if I could just call a function for it rather than
poking into kvm internals ;)

> Right now I'm thinking about using the signal machinery since it appears 
> to do exactly the right thing.

signals are *expensive* though.

If you design an interrupt interface, it'd rock if you could make it
such that it is "raise <this> interrupt within <x> miliseconds from
now", rather than making it mostly synchronous. That way irq mitigation
becomes part of the interface rather than having to duplicate it all
over the virtual drivers...



-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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