I believe this is still related to lack of rhboot upstreaming patches to
grub to use highmem allocations; such that lowmem remains unused; and
thus SEV/SWIOTLB can be used "normally".
It is likely the difference you see is due to fedora's grub patches.
It would be interesting, if you could unpack & use fedora's kernel with
ubuntu's grub, and see if fedora's kernel starts failing when booted via
ubuntu's grub?
Or vice-versa; unpack and use ubuntu's kernel on fedora with fedora's
grub to observe it working fine.
That would help eliminate differences of grub between the distros with
the same kernels.
** Also affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1955655
Title:
kernel-5.13.0-23-generic : Unable to boot when Secure Encrypted
Virtualization( SEV) is enabled without setting swiotlb boot param
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