libtdxattest : quote generation fails with vsock method

[hector-cao]

Describe the bug

From the guest, the quote can be requested via 2 methods:

• vsock: connect to QGS service on the host through vsock
• tsm: ask guest kernel do do that (through configfs tsm) and the kernel will connect to the QGS (with provided vsock address in qemu commandline)

If we misconfigured the QGS address for the tsm method, we still expect the quote generation to succeed because tdxattest lib will use the vsock method

This is not the actual behavior because the quote generation fails actually.

To Reproduce

• Run the guest with wrong QGS address configuration :

  qemu-system-x86 ... -object '{"qom-type":"tdx-guest","id":"tdx","quote-generation-socket":{"type": "vsock", "cid":"222","port":"4050"}}'

  Here we set the dest CID=222 and the expected value is 2.

• From the guest, try to request the quote generation

  /usr/share/doc/libtdx-attest-dev/examples/test_tdx_attest

  The quote generation will fail

Expected behavior

The quote generation should succeed

System report

N/A

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The internal ticket has been created: https://warthogs.atlassian.net/browse/PEK-1410.

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