Re: [Qemu-devel] [PATCH] vga: set owner for mmio regions

[Thomas Huth <thuth@redhat.com>]

On 26.06.2018 08:09, Gerd Hoffmann wrote:
> This makes sure the regions are properly cleaned when unplugging -device
> seconday-vga.
> 
> Reported-by: Thomas Huth <thuth@redhat.com>
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  hw/display/vga_int.h    |  1 +
>  hw/display/vga-pci.c    | 11 ++++++-----
>  hw/display/virtio-vga.c |  2 +-
>  3 files changed, 8 insertions(+), 6 deletions(-)

Thanks, this fixes the issue indeed! Without this patch:

$ valgrind mips-softmmu/qemu-system-mips -accel qtest -monitor stdio
[...]
(qemu) device_add secondary-vga
Unsupported bus. Bus doesn't have property 'acpi-pcihp-bsel' set
(qemu) dump-guest-memory /dev/null 0 4096
==8407== Invalid read of size 8
==8407==    at 0x6B0DA5: object_dynamic_cast (object.c:613)
==8407==    by 0x6B0DA5: object_resolve_abs_path (object.c:1721)
==8407==    by 0x6B0E00: object_resolve_partial_path (object.c:1745)
==8407==    by 0x6B0E62: object_resolve_partial_path (object.c:1755)
[...]

With this patch applied, the problem is gone.

Tested-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>