Virtualization - Mar 2015 - [virtio-dev] Re: [PATCH v3] Add virtio-input driver.

Hi,
> > input layer checks it and ignores events not supported (according to
the
> > support bitmaps).
> 
> Right but support bitmaps come from host too, no?
Yes, but the driver will not set invalid bits (bitcount argument for the
virtinput_cfg_bits() function is the number of valid bits of the
specific bitmap).

cheers,
  Gerd

On Tue, Mar 24, 2015 at 02:37:24PM +0100, Gerd Hoffmann
wrote:
>   Hi,
> 
> > > input layer checks it and ignores events not supported (according
to the
> > > support bitmaps).
> > 
> > Right but support bitmaps come from host too, no?
> 
> Yes, but the driver will not set invalid bits (bitcount argument for the
> virtinput_cfg_bits() function is the number of valid bits of the
> specific bitmap).
> 
> cheers,
>   Gerd
> 
> 
> 
Question: does linux ever get such events from userspace
as opposed to sending them to userspace?

-- 
MST

On Di, 2015-03-24 at 15:14 +0100, Michael S. Tsirkin
wrote:
> On Tue, Mar 24, 2015 at 02:37:24PM +0100, Gerd Hoffmann wrote:
> >   Hi,
> > 
> > > > input layer checks it and ignores events not supported
(according to the
> > > > support bitmaps).
> > > 
> > > Right but support bitmaps come from host too, no?
> > 
> > Yes, but the driver will not set invalid bits (bitcount argument for
the
> > virtinput_cfg_bits() function is the number of valid bits of the
> > specific bitmap).
> > 
> > cheers,
> >   Gerd
> > 
> > 
> > 
> 
> Question: does linux ever get such events from userspace
> as opposed to sending them to userspace?
Yes, it's possible using the userspace input driver
(CONFIG_INPUT_UINPUT)

cheers,
  Gerd