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Because some VMs in QEMU can get GPU virtualization (using technologies such as iGVT-g, as mentioned previously), they could produce a video output that had a higher display refresh rate than of what the GTK display was displaying. (fxp. Playing a video game inside of a Windows VM at 60 Hz, while the output stood locked at 33 Hz because of defaults set in include/ui/console.h) Since QEMU does indeed have internal systems for determining frame times as defined in ui/console.c. The code checks for a variable called update_interval that it later uses for time calculation. This variable, however, isn't defined anywhere in ui/gtk.c and instead ui/console.c just sets it to GUI_REFRESH_INTERVAL_DEFAULT which is 30 update_interval represents the number of milliseconds per display refresh, and by doing some math we get that 1000/30 = 33.33... Hz This creates the mentioned problem and what this patch does is that it checks for the display refresh rate reported by GTK itself (we can take this as a safe value) and just converts it back to a number of milliseconds per display refresh. Signed-off-by: Nikola Pavlica <pavlica.nikola@gmail.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-id: 20200108121342.29597-1-pavlica.nikola@gmail.com [ kraxel: style tweak: add blank line between vars and code ] Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> |
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