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Re: [Qemu-devel] [Xen-devel] [PATCH 3/3 v4] xenfb: Add [feature|request]
From: |
Stefano Stabellini |
Subject: |
Re: [Qemu-devel] [Xen-devel] [PATCH 3/3 v4] xenfb: Add [feature|request]-raw-pointer |
Date: |
Thu, 12 Oct 2017 10:27:01 -0700 (PDT) |
User-agent: |
Alpine 2.10 (DEB 1266 2009-07-14) |
On Thu, 12 Oct 2017, Paul Durrant wrote:
> > -----Original Message-----
> > From: Gerd Hoffmann [mailto:address@hidden
> > Sent: 12 October 2017 10:26
> > To: Paul Durrant <address@hidden>; 'Stefano Stabellini'
> > <address@hidden>; Anthony Perard <address@hidden>
> > Cc: address@hidden; address@hidden; Owen Smith
> > <address@hidden>
> > Subject: Re: [Xen-devel] [PATCH 3/3 v4] xenfb: Add [feature|request]-raw-
> > pointer
> >
> > Hi,
> >
> > > It's probably OS specific though. I guess the behaviour changed
> > > because the OS favours absolute pointing devices over relative ones
> > > and how it has two absolute ones to choose from. How it reconciles
> > > those, who knows?
> >
> > Typically hid emulation calls qemu_input_handler_activate() when the
> > guest initializes the device, which moves the device to the top of the
> > priority list.
> >
> > Visible effect on a typical guest with ps/2 mouse and usb-tablet is
> > that qemu switches from relative mode (mouse) to absolute mode (tablet)
> > when the guest loads the usb hid driver.
> >
> > I suspect pvmouse is doing the same thing. So it may simply depend on
> > guest driver load order whenever pvmouse or usb-tablet is used.
> >
> > Simplest fix is probably to only attach the device you plan to use to
> > the guest. If you can't turn off pvmouse for xen guests then you might
> > want drop the qemu_input_handler_activate() call, so it behaves simliar
> > to the ps/2 mouse (is used in case no other pointer device is present).
>
> Avoiding the activate call sounds reasonable and should avoid the behavioural
> change.
+1
Owen, are you up for resubmitting the series with this small change?
- Re: [Qemu-devel] [PATCH 3/3 v4] xenfb: Add [feature|request]-raw-pointer, Anthony PERARD, 2017/10/02
- Re: [Qemu-devel] [PATCH 3/3 v4] xenfb: Add [feature|request]-raw-pointer, Stefano Stabellini, 2017/10/10
- Re: [Qemu-devel] [PATCH 3/3 v4] xenfb: Add [feature|request]-raw-pointer, Anthony PERARD, 2017/10/11
- Re: [Qemu-devel] [PATCH 3/3 v4] xenfb: Add [feature|request]-raw-pointer, Stefano Stabellini, 2017/10/11
- Re: [Qemu-devel] [Xen-devel] [PATCH 3/3 v4] xenfb: Add [feature|request]-raw-pointer, Paul Durrant, 2017/10/12
- Re: [Qemu-devel] [Xen-devel] [PATCH 3/3 v4] xenfb: Add [feature|request]-raw-pointer, Gerd Hoffmann, 2017/10/12
- Re: [Qemu-devel] [Xen-devel] [PATCH 3/3 v4] xenfb: Add [feature|request]-raw-pointer, Paul Durrant, 2017/10/12
- Re: [Qemu-devel] [Xen-devel] [PATCH 3/3 v4] xenfb: Add [feature|request]-raw-pointer,
Stefano Stabellini <=
- Re: [Qemu-devel] [Xen-devel] [PATCH 3/3 v4] xenfb: Add [feature|request]-raw-pointer, Owen Smith, 2017/10/19
- Re: [Qemu-devel] [PATCH 3/3 v4] xenfb: Add [feature|request]-raw-pointer, Anthony PERARD, 2017/10/12