Observed tdx-demo-packages repository is invalid error while running tdx-demo-install.sh script.
Repository 'tdx-demo-packages' is invalid.
[tdx-demo-packages|https://download.opensuse.org/repositories/devel:/coco:/Leap15.5/15.5/] Valid metadata not found at specified URL
History:

• [|] Error trying to read from 'https://download.opensuse.org/repositories/devel:/coco:/Leap15.5/15.5/'
• Timeout exceeded when accessing 'https://download.opensuse.org/repositories/devel:/coco:/Leap15.5/15.5/content'.
  ./tdx-demo-install.sh: FAILURE: could not install utility packages

could you help to resolve this error?

In the script provided in this repository, the running TDX virtual machine seems to be 1 core. I can start a multi-core virtual machine without TDX protection, but even a two-core TDX virtual machine will encounter the following error:

KVM internal error. Suberror: 4
extra data[0]: 0xc000092000000122
extra data[1]: 0x000000000000001f
EAX=00000000 EBX=00000000 ECX=00000000 EDX=000806f8
ESI=00000000 EDI=00000000 EBP=00000000 ESP=00000000
EIP=0000fff0 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0000 00000000 0000ffff 00009300
CS =f000 ffff0000 0000ffff 00009b00
SS =0000 00000000 0000ffff 00009300
DS =0000 00000000 0000ffff 00009300
FS =0000 00000000 0000ffff 00009300
GS =0000 00000000 0000ffff 00009300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 0000ffff
IDT=     00000000 0000ffff
CR0=60000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000000
Code=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

I have encountered this error at various stages of the virtual machine, when starting up, running and shutting down.
The installation steps I referred to fully follow the relevant instructions in this repository, and the 1-core TDX virtual machine runs well. How should I go about troubleshooting the source of this issue?