Re: [PATCH 0/4] Add ivshmem-flat device

["Alex Bennée" <alex.bennee@linaro.org>]

Gustavo Romero <gustavo.romero@linaro.org> writes:

> This patchset introduces a new device, ivshmem-flat, which is similar to the
> current ivshmem device but does not require a PCI bus. It implements the ivshmem
> status and control registers as MMRs and the shared memory as a directly
> accessible memory region in the VM memory layout. It's meant to be used on
> machines like those with Cortex-M MCUs, which usually lack a PCI bus, e.g.,
> lm3s6965evb and mps2-an385. Additionally, it has the benefit of requiring a tiny
> 'device driver,' which is helpful on some RTOSes, like Zephyr, that run on
> memory-constrained resource targets.
>
> The patchset includes a QTest for the ivshmem-flat device, however, it's also
> possible to experiment with it in two ways:
>
> (a) using two Cortex-M VMs running Zephyr; or
> (b) using one aarch64 VM running Linux with the ivshmem PCI device and another
>     arm (Cortex-M) VM running Zephyr with the new ivshmem-flat device.
>
> Please note that for running the ivshmem-flat QTests the following patch, which
> is not committed to the tree yet, must be applied:
>
> https://lists.nongnu.org/archive/html/qemu-devel/2023-11/msg03176.html
>
> --
>
> To experiment with (a), clone this Zephyr repo [0], set the Zephyr build
> environment [1], and follow the instructions in the 'ivshmem' sample main.c [2].
>
> [0] https://github.com/gromero/zephyr/tree/ivshmem
> [1] https://docs.zephyrproject.org/latest/develop/getting_started/index.html
> [2] https://github.com/gromero/zephyr/commit/73fbd481e352b25ae5483ba5048a2182b90b7f00#diff-16fa1f481a49b995d0d1a62da37b9f33033f5ee477035e73465e7208521ddbe0R9-R70
>
> To experiment with (b):

If you could put these blobs up on fileserver.linaro.org you could add
an avocado test to compliment the qtest.

-- 
Alex Bennée
Virtualisation Tech Lead @ Linaro