linux-kernel - Re: [RFC PATCH 0/3] generic hypercall support

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Message-ID: <4A06A59A.2010703@redhat.com>
Date:	Sun, 10 May 2009 12:59:54 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Gregory Haskins <ghaskins@...ell.com>
CC:	Anthony Liguori <anthony@...emonkey.ws>,
	Chris Wright <chrisw@...s-sol.org>,
	Gregory Haskins <gregory.haskins@...il.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [RFC PATCH 0/3] generic hypercall support

Gregory Haskins wrote:
>>
>> That only works if the device exposes a pio port, and the hypervisor
>> exposes HC_PIO.  If the device exposes the hypercall, things break
>> once you assign it.
>>     
>
> Well, true.  But normally I would think you would resurface the device
> from G1 to G2 anyway, so any relevant transform would also be reflected
> in the resurfaced device config.  

We do, but the G1 hypervisor cannot be expected to understand the config 
option that exposes the hypercall.

> I suppose if you had a hard
> requirement that, say, even the pci-config space was pass-through, this
> would be a problem.  I am not sure if that is a realistic environment,
> though. 
>   

You must pass through the config space, as some of it is device 
specific.  The hypervisor will trap config space accesses, but unless it 
understands them, it cannot modify them.

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

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