linux-kernel - Re: [PATCH v11 3/5] x86/sgx: Define error codes for use by ENCLS[EUPDATESVN]

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Message-ID: <9f6f6ea01acf4347632f5fa773d90c1d18ff6d42.camel@intel.com>
Date: Wed, 6 Aug 2025 23:41:56 +0000
From: "Huang, Kai" <kai.huang@...el.com>
To: "Reshetova, Elena" <elena.reshetova@...el.com>, "Hansen, Dave"
	<dave.hansen@...el.com>
CC: "seanjc@...gle.com" <seanjc@...gle.com>, "mingo@...nel.org"
	<mingo@...nel.org>, "Scarlata, Vincent R" <vincent.r.scarlata@...el.com>,
	"x86@...nel.org" <x86@...nel.org>, "jarkko@...nel.org" <jarkko@...nel.org>,
	"Annapurve, Vishal" <vannapurve@...gle.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "Mallick, Asit K" <asit.k.mallick@...el.com>,
	"Aktas, Erdem" <erdemaktas@...gle.com>, "Cai, Chong" <chongc@...gle.com>,
	"Bondarevska, Nataliia" <bondarn@...gle.com>, "linux-sgx@...r.kernel.org"
	<linux-sgx@...r.kernel.org>, "Raynor, Scott" <scott.raynor@...el.com>
Subject: Re: [PATCH v11 3/5] x86/sgx: Define error codes for use by
 ENCLS[EUPDATESVN]

On Wed, 2025-08-06 at 11:11 +0300, Elena Reshetova wrote:
> Add error codes for ENCLS[EUPDATESVN], then SGX CPUSVN update
> process can know the execution state of EUPDATESVN and notify
> userspace.
> 
> Signed-off-by: Elena Reshetova <elena.reshetova@...el.com>
> ---
>  arch/x86/include/asm/sgx.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/x86/include/asm/sgx.h b/arch/x86/include/asm/sgx.h
> index 6a0069761508..2da5b3b117a1 100644
> --- a/arch/x86/include/asm/sgx.h
> +++ b/arch/x86/include/asm/sgx.h
> @@ -73,6 +73,10 @@ enum sgx_encls_function {
>   *				public key does not match IA32_SGXLEPUBKEYHASH.
>   * %SGX_PAGE_NOT_MODIFIABLE:	The EPC page cannot be modified because it
>   *				is in the PENDING or MODIFIED state.
> + * %SGX_INSUFFICIENT_ENTROPY:	Insufficient entropy in RNG.
> + * %SGX_NO_UPDATE:		EUPDATESVN could not update the CPUSVN because the
> + *				current SVN was not newer than CPUSVN. This is the most
> + *				common error code returned by EUPDATESVN.
>   * %SGX_UNMASKED_EVENT:		An unmasked event, e.g. INTR, was received
>   */
>  enum sgx_return_code {
> @@ -81,6 +85,8 @@ enum sgx_return_code {
>  	SGX_CHILD_PRESENT		= 13,
>  	SGX_INVALID_EINITTOKEN		= 16,
>  	SGX_PAGE_NOT_MODIFIABLE		= 20,
> +	SGX_INSUFFICIENT_ENTROPY	= 29,
> +	SGX_NO_UPDATE				= 31,

It seems the tap/writespace is broken, i.e., this error code is not
aligned with others.

>  	SGX_UNMASKED_EVENT		= 128,
>  };
>