Re: [Qemu-devel] [Spice-devel] [PATCH v2] qxl: don't render stuff when the vm is stopped.

[Alon Levy <alevy@redhat.com>]

On Wed, Feb 15, 2012 at 03:45:30PM +0100, Gerd Hoffmann wrote:
> This patch fixes the local qxl renderer to not kick spice-server
> in case the vm is stopped.  First it is largely pointless because
> we ask spice-server to process all not-yet processed commands when
> the vm is stopped, so there isn't much do do anyway.  Second we
> avoid triggering an assert in spice-server.
> 
> The patch makes sure we still honor redraw requests, even if we don't
> ask spice-server for updates.  This is needed to handle displaysurface
> changes with a stopped vm correctly.
> 
> With this patch applied it is possible to take screen shots (via
> screendump monitor command) from a qxl gpu even in case the guest
> is stopped.
> 

ACK.

> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  hw/qxl-render.c |   12 +++++-------
>  1 files changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/qxl-render.c b/hw/qxl-render.c
> index 133d093..7084143 100644
> --- a/hw/qxl-render.c
> +++ b/hw/qxl-render.c
> @@ -121,19 +121,17 @@ void qxl_render_update(PCIQXLDevice *qxl)
>          dpy_resize(vga->ds);
>      }
>  
> -    if (!qxl->guest_primary.commands) {
> -        return;
> -    }
> -    qxl->guest_primary.commands = 0;
> -
>      update.left   = 0;
>      update.right  = qxl->guest_primary.surface.width;
>      update.top    = 0;
>      update.bottom = qxl->guest_primary.surface.height;
>  
>      memset(dirty, 0, sizeof(dirty));
> -    qxl_spice_update_area(qxl, 0, &update,
> -                          dirty, ARRAY_SIZE(dirty), 1, QXL_SYNC);
> +    if (runstate_is_running() && qxl->guest_primary.commands) {
> +        qxl->guest_primary.commands = 0;
> +        qxl_spice_update_area(qxl, 0, &update,
> +                              dirty, ARRAY_SIZE(dirty), 1, QXL_SYNC);
> +    }
>      if (redraw) {
>          memset(dirty, 0, sizeof(dirty));
>          dirty[0] = update;
> -- 
> 1.7.1
> 
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