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Detect TDX Guest when it's virtualised using Hyper-V #138

Merged
merged 1 commit into from
Nov 6, 2023
Merged

Detect TDX Guest when it's virtualised using Hyper-V #138

merged 1 commit into from
Nov 6, 2023
+15 −1

Commits on Nov 6, 2023

  1. Detect TDX Guest when it's virtualised using Hyper-V 

    Microsoft has decided to purposefully hide the information of the guest
TEE when VMs are being created using Hyper-V.

This leads us to check for the Hyper-V cpuid features (0x4000000C), and
then for the `ebx` value set.

For Intel TDX, `ebx` is set as `0xbe3`, being 3 the part we're mostly
interested about,according to:
https://github.com/torvalds/linux/blob/d2f51b3516dade79269ff45eae2a7668ae711b25/arch/x86/include/asm/hyperv-tlfs.h#L169-L174

NOTE: On the tests side, we had to manually override the cpuid in order
to avoid the tests failing, and this was suggested by Klaus himself.

Signed-off-by: Fabiano Fidêncio <[email protected]>
    @fidencio
    fidencio committed Nov 6, 2023
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