I played around more with the uefi options and (by sheer luck and
intuition) found how to fix this! :-)
In `Advanced->AMD CBS->NBIO Common Options` set `IOMMU = Enabled` (it
was disabled by default!)
Now SME works fine with Bios Options TSME=Enabled, Scramble=Enabled.
** Changed in: linux (Ubunt
After some more searching, I did find two options in the UEFI:
"TSME" (Description: "Transparent SME: AddrTweakEn = 1; ForceEncrEn =1;
DataEncrEn = 0")
"Data Scramble" (Description: "Data scrambling: DataScrambleEn. ")
Both can be set to Enabled/Disabled/Auto, with auto being the default.
I tri
A few more things: /proc/cpuinfo reports both `sme` and `sev`.
cpuid confirms that the relevant cpu register bits are set:
$ cpuid -r -1 -l 0x801f
CPU:
0x801f 0x00: eax=0x0001000f ebx=0x016f ecx=0x01fd edx=0x0001
$ modprobe msr
$ rdmsr 0xC0010010
f4
$ grep CONFIG_AMD_M
