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Re: [PATCH] hw: wdt: implement sbsa watchdog

From: Maxim Uvarov
Subject: Re: [PATCH] hw: wdt: implement sbsa watchdog
Date: Fri, 2 Oct 2020 17:06:07 +0300

On Thu, 1 Oct 2020 at 23:36, Peter Maydell <peter.maydell@linaro.org> wrote:
> On Thu, 1 Oct 2020 at 20:37, Maxim Uvarov <maxim.uvarov@linaro.org> wrote:
> >
> > Initial virtual driver matching linux kernel sbsa_gwdt
> > driver. Driver implements basic functionality and makes
> > watchdog works on virtual machine and allows to reboot
> > secure OS. I.e. atf->optee->efi/uboot->kernel. More
> > information about that device can be found under:
> > ARM DEN0029B - Server Base System Architecture (SBSA)
> >
> > Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>
> Hi; what's the relationship between this SBSA watchdog
> device model and the one that Shashi posted recently?
> https://patchew.org/QEMU/20200929180410.33058-1-shashi.mallela@linaro.org/
> thanks
> -- PMM

Nice it's the same driver written a little bit differently. I did not
see his patch before. 2 things missing in Sashis driver which are
useful for me:
1. Add sbsa watchdog to machine virt also. That helped me to reboot a
virtual machine with secure payload.
2. I specially did not disable timer on driver close. I.e. "reboot"
linux path reboots with that watchdog.  And make timeout lower to not
wait for a long period.

Can this driver also be considered for virt machine?


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