netdev - Re: [PATCH v3 3/6] vbus: add a "vbus-proxy" bus model for vbus

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Date:	Tue, 18 Aug 2009 13:13:57 +0300
From:	Avi Kivity <avi@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	Gregory Haskins <gregory.haskins@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Gregory Haskins <ghaskins@...ell.com>, kvm@...r.kernel.org,
	alacrityvm-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v3 3/6] vbus: add a "vbus-proxy" bus model for	vbus_driver
 objects

On 08/18/2009 01:09 PM, Michael S. Tsirkin wrote:
>
>> mmio and pio don't have this problem since the host can use the address
>> to locate the destination.
>>      
> So userspace could map hypercall to address during setup and tell the
> host kernel?
>    

Suppose a nested guest has two devices.  One a virtual device backed by 
its host (our guest), and one a virtual device backed by us (the real 
host), and assigned by the guest to the nested guest.  If both devices 
use hypercalls, there is no way to distinguish between them.

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

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