[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <200908272033.26540.rusty@rustcorp.com.au>
Date: Thu, 27 Aug 2009 20:33:26 +0930
From: Rusty Russell <rusty@...tcorp.com.au>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: Arnd Bergmann <arnd@...db.de>,
virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, hpa@...or.com, mingo@...e.hu,
akpm@...ux-foundation.org
Subject: Re: [PATCHv4 2/2] vhost_net: a kernel-level virtio server
On Thu, 27 Aug 2009 07:40:26 pm Michael S. Tsirkin wrote:
> On Wed, Aug 26, 2009 at 03:40:59PM +0200, Arnd Bergmann wrote:
> > On Tuesday 25 August 2009, Michael S. Tsirkin wrote:
> > > > I'd like to avoid that here,
> > > > though it's kind of ugly. We'd need VHOST_GET_FEATURES (and ACK) to take a
> > > > struct like:
> > > >
> > > > u32 feature_size;
> > > > u32 features[];
> >
> > Hmm, variable length ioctl arguments, I'd rather not go there.
> > The ioctl infrastructure already has a length argument encoded
> > in the ioctl number. We can use that if we need more, e.g.
> >
> > /* now */
> > #define VHOST_GET_FEATURES _IOR(VHOST_VIRTIO, 0x00, __u64)
> > /*
> > * uncomment if we run out of feature bits:
> >
> > struct vhost_get_features2 {
> > __u64 bits[2];
> > };
> > #define VHOST_GET_FEATURES2 _IOR(VHOST_VIRTIO, 0x00, \
> > struct vhost_get_features2)
> > */
>
>
> I thought so, too. Rusty, agree?
Yep, am convinced. Make it u64 to stop us having to do this tomorrow, then
we can always extend later.
Thanks,
Rusty.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists