Re: [Qemu-devel] [PATCH v6 2/7] hw/misc: add vmcoreinfo device

[Eduardo Habkost]

On Tue, Apr 17, 2018 at 03:12:03PM -0400, Cole Robinson wrote:
[...]
> Reviving this... did any follow up changes happen?
> 
> Marc-André patched virt-manager a few months back to enable -device
> vmcoreinfo for new VMs:
> 
> https://www.redhat.com/archives/virt-tools-list/2018-February/msg00020.html
> 
> And I see there's at least a bug tracking adding this to openstack for
> new VMs:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=1555276
> 
> If this feature doesn't really have any downsides, it would be nice to
> get this tied to new machine types. Saves a lot of churn for higher
> levels of the stack

I understand this would be nice to have considering the existing
stacks, but at the same time I would like the rest of the
stack(s) to really try to not depend on QEMU machine-types to
define policy/defaults.

Every feature that is hidden behind an opaque machine-type name
and not visible in the domain XML and QEMU command-line increases
the risk of migration and compatibility bugs.

This was being discussed in a mail thread at:
https://www.mail-archive.com/address@hidden/msg01196.html

Quoting Daniel, on that thread:

] Another case is the pvpanic device - while in theory that could
] have been enabled by default for all guests, by QEMU or a config
] generator library, doing so is not useful on its own. The hard
] bit of the work is adding code to the mgmt app to choose the
] action for when pvpanic triggers, and code to handle the results
] of that action.

>From that comment, I understand that simply making QEMU create a
pvpanic device by default on pc-2.13+ won't be useful at all?

-- 
Eduardo