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I got an email from linode yesterday telling me they need to do the same. Not sure if they had any public communication yet.

realize that there's Xen HVM and Xen PV. there have been significantly more security issues in HVM than there have been in PV.

Do we know why HVM/hw-virt has had more security issues than PV/sw-virt?

Yes, because it uses QEMU. That means more code, and ultimately more bugs, which means more possible exploits.

Linode rebooted my server in Tokyo ~16 hours ago.