switch xen to PVH mode #1879
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switch xen to PVH mode #1879
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Simple stuff, setting console to hvc0 and enabling autologin. Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>
Our Xen configs don't currently work because xen grub uses a special code path in grub that does not support zstd compressed kernels. We switched kernel compression to zstd two years ago. The only grub xen config that supports this is xen-pvh. Switch our grub xen to the pvh and adapt configs to run domU in PVH mode. With this change the pygrub config works. Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>
In PVH mode grub can't be chainloaded from grub, so we either need to use pygrub or the host provided grub needs to support Flatcar specifics. Publish our xen-pvh grub along with the image and use it from the pvgrub config. Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>
For completeness. Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>
Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>
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switch xen to PVH mode
zstd compressed kernels in Xen are only supported when the host provides the kernel or using grub-xen-pvh. The previous configuration using pvgrub(2) didn't work at all. To make it work again, switch to grub-xen-pvh. Flatcar now only supports booting with pvh or hvm mode. I also added an hvm config for quick usage.
How to use
Testing done
Tested the steps above on a Debian 12 dom0.
[Describe the testing you have done before submitting this PR. Please include both the commands you issued as well as the output you got.]
changelog/directory (user-facing change, bug fix, security fix, update)/bootand/usrsize, packages, list files for any missing binaries, kernel modules, config files, kernel modules, etc.