topic Intel Xeon 4510 CPU Support for TDX TD-Partitioning and Configuration Queries in Intel® ISA Extensions

Intel Xeon 4510 CPU Support for TDX TD-Partitioning and Configuration Queries

ywyao — Tue, 08 Apr 2025 00:56:20 GMT

I have a few questions regarding the Intel Xeon 4510 CPU and its support for TDX TD-partitioning:

1. I want to know if td-partitioning is currently available and if there are any documents about the deployment of td-partitioning? I could only find a repository on GitHub https://github.com/intel/td-partitioning.git , but it has already been abandoned.

2. As the issue window of the GitHub repository is closed, I need to raise the problems I encountered when setting up td-partitioning in this community. There is a problem when using L1-QEMU to launch L1-VMM: "qemu-system-x86_64: cpus are not resettable, terminating". Does the TDX enlightened host L0 not support KVM vcpu reset?

3. The kernel boot parameter dmesg reports "[ 3.605856] tdx: SEAMCALL failed: leaf 254, error 0xc000050500000000. [ 3.605878] tdx: TDDEBUGCONFIG isn't supported." I cannot find the corresponding function of SEAMCALL leaf 254 in the existing documents. Will this affect td-partitioning?

Re: Intel Xeon 4510 CPU Support for TDX TD-Partitioning and Configuration Queries

ywyao — Tue, 06 May 2025 09:09:48 GMT

Everything runs great after changing the wrong initramfs.

Re: Intel Xeon 4510 CPU Support for TDX TD-Partitioning and Configuration Queries

ywyao — Fri, 30 May 2025 00:38:43 GMT

Hi all,
I still have a doubt. Does anyone know whether the current TD-partitioning supports to launch multiple L2 TD VMs in a L1 VMM?
I was able to successfully launch one L2 TD VM, but starting a second one fails. It seems to be related to memmap restrictions in the current implementation.
Specifically, corresponding config of L1 VMM:
-append "root=/dev/vda1 rw console=hvc0 nomce no-kvmclock no-steal-acc ignore_loglevel nopat memmap=1023M\$1M memmap=2G\$4G"
Then set up memmap for L2 VM, I use:
-object memory-backend-file,mem-path=/dev/mem,size=${MEMORY},share=on,id=mem0 \
-M q35,accel=kvm,kvm-type=td-part,memory-backend=mem0,max-ram-below-4g=1G

https://github.com/intel/td-partitioning/blob/td_part_l0_vmm/TD_PARTITIONING_README.md