Re: [PATCH v2 0/3] TDX attestation support and GHCI fixup

[Binbin Wu]

On 6/20/2025 2:01 AM, Paolo Bonzini wrote:
> This is a refresh of Binbin's patches with a change to the userspace
> API.  I am consolidating everything into a single KVM_EXIT_TDX and
> adding to the contract that userspace is free to ignore it *except*
> for having to reenter the guest with KVM_RUN.
>
> If in the future this does not work, it should be possible to introduce
> an opt-in interface.  Hopefully that will not be necessary.
>
> Paolo
>
> Binbin Wu (3):
>    KVM: TDX: Add new TDVMCALL status code for unsupported subfuncs
>    KVM: TDX: Handle TDG.VP.VMCALL<GetQuote>
>    KVM: TDX: Exit to userspace for GetTdVmCallInfo
>
>   Documentation/virt/kvm/api.rst    | 62 ++++++++++++++++++++++++-
>   arch/x86/include/asm/shared/tdx.h |  1 +
>   arch/x86/kvm/vmx/tdx.c            | 77 ++++++++++++++++++++++++++++---
>   include/uapi/linux/kvm.h          | 22 +++++++++
>   4 files changed, 154 insertions(+), 8 deletions(-)
Tested the patch set with the TDX kvm-unit-tests, TDX enhanced KVM selftests,
booting a Linux TD, and TDX related test cases defined in the LKVS test suite
as described in:
https://github.com/intel/lkvs/blob/main/KVM/docs/lkvs_on_avocado.md

Xiaoyao has tested the flow for GetQuote and had some comments for small issues
on qemu patch:
https://mail.gnu.org/archive/html/qemu-devel/2025-06/msg03154.html