linux-kernel - RE: [PATCH] Input: hyperv-keyboard

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Date:	Mon, 18 Aug 2014 03:54:51 +0000
From:	Dexuan Cui <decui@...rosoft.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	KY Srinivasan <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: RE: [PATCH] Input: hyperv-keyboard - implement Type Clipboard Text

> -----Original Message-----
> From: Dmitry Torokhov
> Sent: Saturday, August 16, 2014 0:58 AM
> To: Dexuan Cui
> > For each char in the string, the host sends 2 events (key down/up with the
> > char's UNICODE value) to the guest.
> > The patch finds each char's scan codes of key down/up, and injects the
> > scan codes to the serio keyboard module.
> >
> > Known issues:
> > 1) Only printable ASCII chars are supported, and unsupported chars are
> > ignored. It seems unlikely to support generic UNICODE chars because there
> > is not a generic API to inject a UNICODE char to text mode console, KDE,
> > gnome, etc.
> >
> > 2) When we use the feature, make sure the CapsLock state of the VM's
> > (virtual) keyboard is OFF because this patch assumes it -- we'll try to
> > fix this later, probably by tracking the state of virtual CapsLock, because
> > it looks the keyboard module doesn't supply an API for us to query the
> state
> > of the keyboard.
> >
> No way. If you want to do this this way, do it in hypervisor code and keep
> feeding AT scan codes to hyperv-keyboard, although I am pretty sure users
Hi Dmitry,
Yeah, I had the same wish, but later I found this seems unlikely because IMO
the feature was firstly invented for Windows VM + generic UNICODE chars,
and we know there is no "scan code" for generic UNICODE chars... :-(

> of
> French, Czech and other keyboard layouts with numbers in upper register
> and
> symbols in lower will have a few choice words for you.
Sorry, I can't understand what these are.
Can you please give more details or a link to further info?

> If you want real cut-and-paste support in various DEs I'd recommend
> working
> with VMware on open-vm-tools package to see what can be shared/reused
> there.
> Consider this NACked with prejudice.
> Dmitry
Thanks for the suggestion!
Let me study open-vm-tools and report back.

Thanks,
-- Dexuan
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