tree 55c0d5445a560c8474d8c8a8434453adff500210
parent 21e1a5b255d75c307a62dd13c98c7deb92c8b629
author Fabiano Fidêncio <fabiano.fidencio@intel.com> 1699283655 +0100
committer GitHub <noreply@github.com> 1699283655 -0800
gpgsig -----BEGIN PGP SIGNATURE-----
 
 wsBcBAABCAAQBQJlSQLHCRBK7hj4Ov3rIwAA0RIIAFk/+Xm9O5xisjhvFw20uuDR
 TECN2Odwg/Pj0HtwpGKCAfp9xEJOyEVuy7RFSxLjZoQR5U81k/CGjFph2OeUw/ce
 +rXzapMbcR18E4UTYUSV6uFG15iVA38z7GLWNsltZKFTXPUflUQevT6iRxWa9tvI
 Mfv5SCP3haMeHkUT9cexaYzUWpR6TsJmd3HHuHarJSfZu7W0BPpLJbP89B3CH102
 LzA8KtmwUXUrqsZvFBuWAb7QqVFFos7GL+JEZ6PX9QqjPqmdEd/ngGsCKZ5ZFhse
 hEBdVZGbbqMqlJe0a6uHZHjga3B1UsMOZeMnHu3v0kfNApKrDlVPj8D74YAcxmk=
 =xUmG
 -----END PGP SIGNATURE-----
 

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

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 <fabiano.fidencio@intel.com>