Re: [RFC PATCH 12/15] KVM: TDX: Add in-kernel Quote generation

["Dan Williams (nvidia)" <djbw@kernel.org>]

Xu Yilun wrote:
> From: Peter Fang <peter.fang@intel.com>
> 
> Provide an in-kernel path for TDX Quote generation when handling
> TDG.VP.VMCALL<GetQuote>, without requiring an exit to userspace.
> 
> Use the core TDX API when the TDX Quoting extension is available. For
> simplicity, each KVM guest checks for availability only once during
> initialization. KVM does not handle Quoting service disruptions.
> 
> Signed-off-by: Peter Fang <peter.fang@intel.com>
> Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>
> ---
[..]
> +static u64 __get_quote_kernel(struct kvm_vcpu *vcpu, struct tdx_quote_req *req,
> +			      size_t req_len, gpa_t req_gpa, size_t total_len)
> +{
> +	struct tdx_td *td = &to_kvm_tdx(vcpu->kvm)->td;
> +
> +	/* Only support version 1 as defined in the GHCI spec */
> +	if (req->version != 1)
> +		return TDX_QUOTE_STATUS_ERROR;
> +
> +	if ((size_t)req->in_len + TDX_QUOTE_REQ_HDR_SIZE > req_len)
> +		return TDX_QUOTE_STATUS_ERROR;
> +
> +	/* The caller frees the quote data */

No, it is freed by cleanup as far as I can see

> +	void *quote_data __free(kvfree) =

...this shadows the global "quote_data". A global really should be
properly namespaced.