After installing the new kernel following the guide https://github.com/AMDESE/AMDSEV/tree/sev-snp-devel
IOMMU is configured in passthrough mode:

[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-5.14.0-rc2-snp-host-6d4469b86f90 root=UUID=5271158d-59ce-4c94-b0bd-5f67dbc947e1 ro vga=normal nomodeset iommu=pt modprobe.blacklist=btrfs mem_encrypt=on kvm_amd.sev=1
[ 0.080454] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.14.0-rc2-snp-host-6d4469b86f90 root=UUID=5271158d-59ce-4c94-b0bd-5f67dbc947e1 ro vga=normal nomodeset iommu=pt modprobe.blacklist=btrfs mem_encrypt=on kvm_amd.sev=1
[ 0.080501] Any video related functionality will be severely degraded, and you may not even be able to suspend the system properly
[ 0.500541] AMD-Vi: SEV-SNP: IOMMU is either disabled or configured in passthrough mode.
[ 1.458480] ccp 0000:47:00.1: sev enabled
[ 1.517255] ccp 0000:47:00.1: SEV firmware update successful
[ 1.551278] ccp 0000:47:00.1: SEV API:1.51 build:3
[ 1.660986] SEV supported: 410 ASIDs
[ 1.663654] SEV-ES supported: 99 ASIDs
[ 145.773431] SEV supported: 410 ASIDs
[ 145.773432] SEV-ES supported: 99 ASIDs

Should this be changed through a configuration option in the kernel build script?