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The qxl device ties the cursor to the primary surface. Therefore calling qxl_io_destroy_primary() and qxl_io_create_primary() to switch the framebuffer causes the cursor information being lost and the driver must re-apply it. The correct call order to do that is qxl_io_destroy_primary() + qxl_io_create_primary() + qxl_primary_apply_cursor(). The old code did qxl_io_destroy_primary() + qxl_primary_apply_cursor() + qxl_io_create_primary(). Due to qxl_primary_apply_cursor request being queued in a ringbuffer and qxl_io_create_primary() trapping to the hypervisor instantly there is a high chance that qxl_io_create_primary() is processed first even with the wrong call order. But it's racy and thus not reliable. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Noralf Trønnes <noralf@tronnes.org> Link: http://patchwork.freedesktop.org/patch/msgid/20190118122020.27596-11-kraxel@redhat.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.