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Buster won't boot with Xen hypervisor

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Hey, Debian folks!

After updating to Buster, my system is unable to boot with the Xen hypervisor. When I try and boot, the screen gets stuck loading the ramdisk:
> Loading Xen 4.11-amd64 …
> Loading Linux 4.19.0.8-amd-64 …
> Loading initial ramdisk …

I’m immediately suspicious of the version mismatch, especially since booting “Debian GNU/Linux” instead of “Debian GNU/Linux, with Xen hypervisor” works just fine.

I still have the appropriate xen package installed:
> bash# apt install xen-system
> Reading package lists... Done
> Building dependency tree       
> Reading state information... Done
> Note, selecting 'xen-system-amd64' instead of 'xen-system'
> xen-system-amd64 is already the newest version (4.11.3+24-g14b62ab3e5-1~deb10u1).

And there doesn’t seem to be a 4.11 hypervisor option:
> bash# apt-cache search xen-hypervisor
> xen-hypervisor-4.11-amd64 - Xen Hypervisor on AMD64
> xen-hypervisor-common - Xen Hypervisor - common files
> xen-hypervisor-4.8-amd64 - Xen Hypervisor on AMD64

Furthermore, there also aren’t any packages for a 4.11 stock kernel to match the hypervisor:
> bash# apt-cache search linux-image-4. | fgrep 'amd64 ' | egrep -v 'headers|cloud|rt'
> linux-image-4.19.0-8-amd64 - Linux 4.19 for 64-bit PCs (signed)
> linux-image-4.19.0-6-amd64 - Linux 4.19 for 64-bit PCs (signed)
> linux-image-4.9.0-11-amd64 - Linux 4.9 for 64-bit PCs
> linux-image-4.9.0-12-amd64 - Linux 4.9 for 64-bit PCs
> linux-image-4.9.0-4-amd64 - Linux 4.9 for 64-bit PCs
> linux-image-4.9.0-8-amd64 - Linux 4.9 for 64-bit PCs
> linux-image-4.9.0-9-amd64 - Linux 4.9 for 64-bit PCs


(I also checked what old kernels I had lying around in /boot; only a few varieties of 4.9.0).

Am I correctly understanding the issue here? If so, is there a way to get a newer xen hypervisor from a repo somewhere? (I can’t find it in backports or proposed-updates). Or, is there a way to find a matching old kernel image?

And if not, where do I start debugging?

Thanks for your help,
- Garrett

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Buster won't boot with Xen hypervisor Garrett Reid <garrett.reid@gmail.com> - 2020-02-25 03:40 +0100
  Re: Buster won't boot with Xen hypervisor Garrett Reid <garrett.reid@gmail.com> - 2020-02-25 22:50 +0100

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