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    SubjectRe: [RFC PATCH 2/2] macvtap: TX zero copy between guest and host kernel
    On Wed, Sep 15, 2010 at 10:00:04AM -0700, Shirley Ma wrote:
    > On Wed, 2010-09-15 at 17:39 +0200, Michael S. Tsirkin wrote:
    > > In fact, I rechecked: both bridge and loopback have NETIF_F_HIGHDMA
    > > set.
    > > So maybe we should check NETIF_F_NETNS_LOCAL ...
    > >
    > > macvtap in bridged mode is interesting as well.
    >
    > I found that too, just wondered which flag to use is better. :)
    >
    > Thanks
    > Shirley

    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?

    --
    MST


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