Re: [PATCH v8 1/5] Documentation: add sbsa-gwdt driver documentation

From	Jon Masters <jcm@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v8 1/5] Documentation: add sbsa-gwdt driver documentation
Date	2015-11-02 05:30 +0100
Message-ID	<qqeUO-Ld-17@gated-at.bofh.it> (permalink)
References	(5 earlier) <qpmKL-Q6-31@gated-at.bofh.it> <qpn46-WF-15@gated-at.bofh.it> <qpndM-1fI-19@gated-at.bofh.it> <qqeBr-EF-3@gated-at.bofh.it> <qqeBs-EF-7@gated-at.bofh.it>
Organization	Red Hat, Inc.

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On 11/01/2015 11:06 PM, Timur Tabi wrote:
> Fu Wei wrote:
>> In virtualization system, Linux kernel with KVM support as a
>> Hypervisor, and guest are using a one of SBSA watchdog.
>> WS0 is handled by guest OS, and WS1 will be handled by Hypervisor.
> 
> I don't see how that would work, because the host kernel cannot 
> reconfigure the behavior of WS1.
> 
> Besides, don't KVM guests use some kind of software and/or 
> paravirtualized watchdog?

Indeed, this is my expectation. IIRC the hardware watchdog initially
defined in SBSA was intended for bare metal use to have something people
could start implementing while we worked on the future (the language
around register frames relates to secure/non-secure ELs in my
recollection). For now, I expect an emulated watchdog for VMs, which
ideally would be a software implementation of the same SBSA watchdog.

Jon.

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[PATCH v8 1/5] Documentation: add sbsa-gwdt driver documentation fu.wei@linaro.org - 2015-10-27 17:10 +0100
  Re: [PATCH v8 1/5] Documentation: add sbsa-gwdt driver documentation Mark Rutland <mark.rutland@arm.com> - 2015-10-27 17:30 +0100
    Re: [PATCH v8 1/5] Documentation: add sbsa-gwdt driver documentation Fu Wei <fu.wei@linaro.org> - 2015-10-28 05:20 +0100
      Re: [PATCH v8 1/5] Documentation: add sbsa-gwdt driver documentation Timur Tabi <timur@codeaurora.org> - 2015-10-30 18:50 +0100
        Re: [PATCH v8 1/5] Documentation: add sbsa-gwdt driver documentation Fu Wei <fu.wei@linaro.org> - 2015-10-30 19:40 +0100
          Re: [PATCH v8 1/5] Documentation: add sbsa-gwdt driver documentation Timur Tabi <timur@codeaurora.org> - 2015-10-30 20:00 +0100
            Re: [PATCH v8 1/5] Documentation: add sbsa-gwdt driver documentation Mark Rutland <mark.rutland@arm.com> - 2015-10-30 20:10 +0100
              Re: [PATCH v8 1/5] Documentation: add sbsa-gwdt driver documentation Timur Tabi <timur@codeaurora.org> - 2015-10-30 21:40 +0100
                Re: [PATCH v8 1/5] Documentation: add sbsa-gwdt driver documentation Fu Wei <fu.wei@linaro.org> - 2015-11-02 05:20 +0100
              Re: [PATCH v8 1/5] Documentation: add sbsa-gwdt driver documentation Fu Wei <fu.wei@linaro.org> - 2015-11-02 05:10 +0100
                Re: [PATCH v8 1/5] Documentation: add sbsa-gwdt driver documentation Timur Tabi <timur@codeaurora.org> - 2015-11-02 05:10 +0100
                Re: [PATCH v8 1/5] Documentation: add sbsa-gwdt driver documentation Jon Masters <jcm@redhat.com> - 2015-11-02 05:30 +0100

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