An EPYC Launch!

catsay · June 25, 2017, 11:16pm

I continued this as a separate thread here so others can hopefully chime in.

Secure Virtual Machines and Memory Encryption on Desktop Ryzen? CPU

Ok so here is the relevant section from the documentation regarding SEV and Memory Encryption [image] See Page 534 This is the CPU register as read on my machine (1700x) as dumped using cpuid -r 0x8000001f 0x00: eax=0x00000007 ebx=0x0000016f ecx=0x0000000f edx=0x00000000 Converting register EAX to binary we get EAX 0000 0000 0000 0000 0000 0000 0000 0111 ↳ Bit 0 = 1 Yay! So since bit 0 and 1 is 1. That's a yes on SME and SEV EBX 0000 0000 0000 0000 0000 0001 0110 1111 Here's where it get's funky Bit 5 - 0 (10 1111 = Dec 47) I'm not sure how to interpret that. Clearly used to enable memory encryption. Bit 6 - 11 ( 001 01 = Dec 5) Reduction of physical address space in bits. ECX 0000 0000 0000 0000 0000 0000 0000 1111 To DEC = 15 Secure Virtual Machines supported? This might be offset by 1