/dev/sev: No such file or directory

[Nemurin1]

kernel: Linux nemurin 5.10.134-csv
cpu: Hygon C86 3285 8-core Processor

# sudo ls /dev/sev
ls: could not open '/dev/sev': No such file or directory

# sudo dmesg -T | grep SEV：no output

# sudo dmesg -T | grep SME
[Thu Apr 23 15:46:46 2026] HYGON SME

# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-5.10.134-csv root=UUID=c999ed73-e807-47b1-a0ec-01c74425d41e ro amd_iommu=on mem_encrypt=on kvm-amd.sev=1 kvm-amd.sev_es=1 quiet splash vt.handoff=7

# lsmod | grep kvm
kvm_amd 184320 0
kvm 937984 1 kvm_amd
ccp 286720 1 kvm_amd

# cat /sys/module/kvm_amd/parameters/sev
1

# sudo dmesg | grep -i -E "ccp|SEV"
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-5.10.134-csv root=UUID=c999ed73-e807-47b1-a0ec-01c74425d41e ro amd_iommu=on mem_encrypt=on kvm-amd.sev=1 kvm-amd.sev_es=1 quiet splash vt.handoff=7
[ 0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.10.134-csv root=UUID=c999ed73-e807-47b1-a0ec-01c74425d41e ro amd_iommu=on mem_encrypt=on kvm-amd.sev=1 kvm-amd.sev_es=1 quiet splash vt.handoff=7
[ 23.808027] ccp 0000:03:00.2: no command queues available
[ 23.820482] ccp 0000:04:00.1: ccp enabled
[ 23.822711] ccp 0000:42:00.2: no command queues available
[ 23.832410] ccp 0000:43:00.1: ccp enabled

so why it have not dev of sev? the cpp is enabled.

[tlendacky]

cpu: Hygon C86 3285 8-core Processor

You'll have to contact Hygon about this.