linux-kernel - Re: [PATCH v11 17/17]add two new ioctls for mp device.

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Message-ID: <20100928130928.GE14385@redhat.com>
Date:	Tue, 28 Sep 2010 15:09:28 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	xiaohui.xin@...el.com, netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, mingo@...e.hu, davem@...emloft.net,
	herbert@...dor.hengli.com.au, jdike@...ux.intel.com
Subject: Re: [PATCH v11 17/17]add two new ioctls for mp device.

On Mon, Sep 27, 2010 at 10:36:15PM +0100, Ben Hutchings wrote:
> On Sat, 2010-09-25 at 12:27 +0800, xiaohui.xin@...el.com wrote:
> > From: Xin Xiaohui <xiaohui.xin@...el.com>
> > 
> > The patch add two ioctls for mp device.
> > One is for userspace to query how much memory locked to make mp device
> > run smoothly. Another one is for userspace to set how much meory locked
> > it really wants.
> [...]
> > diff --git a/include/linux/mpassthru.h b/include/linux/mpassthru.h
> > index ba8f320..083e9f7 100644
> > --- a/include/linux/mpassthru.h
> > +++ b/include/linux/mpassthru.h
> > @@ -7,6 +7,8 @@
> >  /* ioctl defines */
> >  #define MPASSTHRU_BINDDEV      _IOW('M', 213, int)
> >  #define MPASSTHRU_UNBINDDEV    _IO('M', 214)
> > +#define MPASSTHRU_SET_MEM_LOCKED	_IOW('M', 215, unsigned long)
> > +#define MPASSTHRU_GET_MEM_LOCKED_NEED	_IOR('M', 216, unsigned long)
> [...]
> 
> These will need compat handling.  You can avoid that by defining them to
> use a parameter type of u32 or u64.
> 
> Ben.

No need to introduce compat mess unless we have to.  I guess int is
sufficient: locking >= 2G just for guest networking is insane.

-- 
MST
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