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: <1172153373.3531.268.camel@laptopd505.fenrus.org>
Date:	Thu, 22 Feb 2007 15:09:33 +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


> Can't it be done by a helper function using a timer and a signal (or 
> whatever mechanism we use to wake up vcpus)?

one could do that but it's not optimal; if the process DOES get waken up
earlier, it should take the interrupt then immediately, so that it
doesn't have to wake up again when the timer fires. 

(in fact it would be nice if the guest could somehow poll at the irq
mask at waking from idle, so that it wouldn't need a vmexit/entry for
every such interrupt, but just do the right thing for all pending work)

In addition, yes it'll be a helper function, but since all drivers will
want the functionality its probably best off in the generic code


-- 
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