Missing cache information on x86-64 under Intel TDX (glibc bug 30643)

[fweimer-rh]

I'm trying to raise awareness for a TDX issue that appears to impact application compatibility:

• Missing cache information on x86-64 under Intel TDX (glibc bug 30643)
• Missing cache information on x86-64 under Intel TDX

This was observed before to cause glibc crashes, but the root cause was not addressed:

• glibc 2.34 and newer segfault if CPUID leaf 0x2 reports zero

I believe the TDX reference implementation for qemu-kvm is impacted as well because people reported problems when they used it for validating TDX kernel support.

I would like to invite you to join the discussion on libc-alpha. Thanks!

[fweimer-rh]

The reference in commit 6e8778f is spurious, it just happens to contain the pair of letters #3.