Re: [PATCH 2/3] KVM: TDX: Handle TDG.VP.VMCALL<GetQuote>

[Binbin Wu]

On 6/20/2025 2:01 AM, Paolo Bonzini wrote:
[...]
> @@ -7174,6 +7175,52 @@ The valid value for 'flags' is:
>     - KVM_NOTIFY_CONTEXT_INVALID -- the VM context is corrupted and not valid
>       in VMCS. It would run into unknown result if resume the target VM.
>   
> +::
> +
> +		/* KVM_EXIT_TDX */
> +		struct {
> +			__u64 flags;
> +			__u64 nr;
> +			union {
> +				struct {
> +					u64 ret;
> +					u64 data[5];
Should the interface reserve more elements?

Without considering XMM registers, the possible registers according to GHCI spec
are RBX, RDX, RBP, RDI, RSI, R8, R9, R12-R15. Since RBP is not suggested to be
used to pass information, how about make the array 10 elements?


> +				} unknown;
> +				struct {
> +					u64 ret;
> +					u64 gpa;
> +					u64 size;
> +				} get_quote;
> +			};
> +		} tdx;
> +