linux-kernel - Re: [Qemu-devel] [RFC] Next gen kvm api

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Message-ID: <4F3BB614.9040706@redhat.com>
Date:	Wed, 15 Feb 2012 15:41:40 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Jan Kiszka <jan.kiszka@...mens.com>
CC:	Anthony Liguori <anthony@...emonkey.ws>,
	qemu-devel <qemu-devel@...gnu.org>,
	Rob Earhart <earhart@...gle.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>
Subject: Re: [Qemu-devel] [RFC] Next gen kvm api

On 02/07/2012 06:29 PM, Jan Kiszka wrote:
> >>>
> >>
> >> Isn't there another level in between just scheduling and full syscall
> >> return if the user return notifier has some real work to do?
> > 
> > Depends on whether you're scheduling a kthread or a userspace process, no?  If 
>
> Kthreads can't return, of course. User space threads /may/ do so. And
> then there needs to be a differences between host and guest in the
> tracked MSRs. 

Right.  Until we randomize kernel virtual addresses (what happened to
that?) and then there will always be a difference, even if you run the
same kernel in the host and guest.

> I think to recall it's a question of another few hundred
> cycles.

Right.

-- 
error compiling committee.c: too many arguments to function

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