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Subject: Re: [virtio-comment] Next VirtIO device for Project Stratos?
"Bradford, Robert" <robert.bradford@intel.com> writes: > On Tue, 2022-05-31 at 09:07 +0100, Alex BennÃe wrote: >> Watchdog / 35 >> ------------- >> >> Discussion about this is usually conflated with reset functionality >> as >> the two are intimately related. >> >> An early interest in this was for providing a well specified reset >> functionality firmware running on the -M virt machine model in QEMU. >> The >> need has been reduced somewhat with the provision of the sbsa-ref >> model >> which does have a defined reset pin. >> >> Other questions that would need to be answered include how the >> functionality would interact with the hypervisor given a vCPU could >> easily not be scheduled by it and therefore miss its kick window. >> > > I guess this a risk with any use of a watchdog whether it be emulating > a physical device or a paravirtualised one. In practice we have never > seen this. > >> Currently there have been no proposals for the spec or >> implementations. > > I was the one who requested the ID be reserved. We have an > implementation in Cloud Hypervisor: > https://github.com/cloud-hypervisor/cloud-hypervisor/blob/main/virtio-devices/src/watchdog.rs > Ahh good. I guess it could be another cloud hypervisor component that makes the transition to rust-vmm if there is interest? > As well as the kernel side: > > https://github.com/cloud-hypervisor/linux/commit/cc8f7579faad79cdf02f9b6a742510cd1b1cf340 > > I admit writing up a patch for the specification fell through the > cracks. That's something I will try to rectify in the near future as it > would also be nice to be able to upstream the kernel patch. Thanks, please feel free to Cc me on any such patches and we can take a look. -- Alex BennÃe
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