linux-kernel - Re: [RFC PATCH 2/2] macvtap: TX zero copy between guest and host kernel

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Message-ID: <1284576488.2573.17.camel@localhost.localdomain>
Date:	Wed, 15 Sep 2010 11:48:08 -0700
From:	Shirley Ma <mashirle@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Arnd Bergmann <arnd@...db.de>, Avi Kivity <avi@...hat.com>,
	"Xin, Xiaohui" <xiaohui.xin@...el.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] macvtap: TX zero copy between guest and host
 kernel

On Wed, 2010-09-15 at 19:30 +0200, Michael S. Tsirkin wrote:
> At some level NETIF_F_NETNS_LOCAL makes sense: local packets
> can get anywhere. OTOH one wonders whether there might be other
> issues, e.g. in theory devices could hang on to frag pages
> just by doing get_page.  There might be other issues.
> Maybe we are better off white-listing known-good drivers
> with a new flag? 

Sounds reasonable to me if there is no such a flag to be easily used.

Thanks
Shirley

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