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Re: [Qemu-devel] [Xen-devel] [PATCH 3/3 v4] xenfb: Add [feature|request]
From: |
Paul Durrant |
Subject: |
Re: [Qemu-devel] [Xen-devel] [PATCH 3/3 v4] xenfb: Add [feature|request]-raw-pointer |
Date: |
Thu, 12 Oct 2017 09:39:16 +0000 |
> -----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.
Cheers,
Paul
>
> HTH,
> Gerd
- 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 <=
- Re: [Qemu-devel] [Xen-devel] [PATCH 3/3 v4] xenfb: Add [feature|request]-raw-pointer, Stefano Stabellini, 2017/10/12
- 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