Re: [PATCH] hw/arm: virt: Add SBSA watchdog

[Peter Maydell]

On Sun, 1 May 2022 at 19:07, Jan Kiszka <jan.kiszka@web.de> wrote:
>
> From: Jan Kiszka <jan.kiszka@siemens.com>
>
> The virt machine lacks a watchdog so far while the sbsa-ref has a simple
> model that is also supported by Linux and even U-Boot. Let's take it to
> allow, e.g., system integration tests of A/B software update under
> watchdog monitoring.
>
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

The virt board has a PCI bus, and QEMU has a model of a
PCI watchdog device -- the i6300esb. Can you use that?

In general I much prefer it if we can support use cases in
virt via pluggable PCI devices rather than hard-wired MMIO
devices -- it means that only users who want the functionality
need to have the exposed attack surface area of the device
present in their VM.

thanks
-- PMM