[PATCH 0/4] Add support for QEMU's ramfb display

[Heinrich Schuchardt]

On 2/27/22 15:40, Alexander Graf wrote:
> QEMU implements multiple ways to expose graphics output to the virt
> machine, but most of them are incompatible with hardware virtualization.
>
> The one that does work reliably is ramfb. It's a very simple mechanism
> in which the guest reserves a memory region for the frame buffer and then
> notifies the host about its location and properties. The host then just
> displays the contents of the frame buffer on screen.
>
> This patch set adds support to drive the ramfb device in our QEMU arm
> targets. Theoretically, it should work as is with any of the other
> architectures as well though.
>
> With this driver, we have a very simple, KVM compatible way to expose
> GOP via UEFI to payloads and thus enable development and testing of
> graphical OS functionality with QEMU's -M virt.
>
> Alexander Graf (4):
>    qfw: Add WRITE definition
>    ramfb: Add driver for ramfb display
>    qfw: Spawn ramfb device if its file is present
>    qemu-arm*: Enable ramfb by default

Please, enable the device on RISC-V too.

Best regards

Heinrich

>
>   arch/arm/Kconfig                    |   4 ++
>   board/emulation/qemu-arm/qemu-arm.c |  14 ++++
>   drivers/misc/qfw.c                  |  23 ++++++
>   drivers/video/Kconfig               |   8 +++
>   drivers/video/MAINTAINERS           |   4 ++
>   drivers/video/Makefile              |   1 +
>   drivers/video/ramfb.c               | 104 ++++++++++++++++++++++++++++
>   include/configs/qemu-arm.h          |   9 +++
>   include/qfw.h                       |   1 +
>   9 files changed, 168 insertions(+)
>   create mode 100644 drivers/video/MAINTAINERS
>   create mode 100644 drivers/video/ramfb.c
>