linux-kernel - Re: [PATCH v5 3/5] x86/sgx: Define error codes for use by ENCLS[EUPDATESVN]

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Message-ID: <5bdc23827265d1aa53a8e30314dbb049c424c3a9.camel@intel.com>
Date: Mon, 19 May 2025 11:36:09 +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>, "linux-sgx@...r.kernel.org"
	<linux-sgx@...r.kernel.org>, "x86@...nel.org" <x86@...nel.org>, "Scarlata,
 Vincent R" <vincent.r.scarlata@...el.com>, "Raynor, Scott"
	<scott.raynor@...el.com>, "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>, "bondarn@...gle.com" <bondarn@...gle.com>,
	"jarkko@...nel.org" <jarkko@...nel.org>, "dionnaglaze@...gle.com"
	<dionnaglaze@...gle.com>
Subject: Re: [PATCH v5 3/5] x86/sgx: Define error codes for use by
 ENCLS[EUPDATESVN]

On Mon, 2025-05-19 at 11:30 +0000, Reshetova, Elena wrote:
> > On Mon, 2025-05-19 at 10:24 +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>
> > > ---
> > 
> > [...]
> > 
> > > 
> > >  /**
> > > @@ -73,6 +74,11 @@ 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_EPC_NOT_READY:			EPC is not ready for SVN
> > update.
> > > + * %SGX_NO_UPDATE:		EUPDATESVN was successful, but
> > CPUSVN was not
> > > + *				updated because current SVN was not newer
> > than
> > > + *				CPUSVN.
> > >   * %SGX_UNMASKED_EVENT:		An unmasked event, e.g. INTR, was
> > received
> > >   */
> > >  enum sgx_return_code {
> > > @@ -81,6 +87,9 @@ enum sgx_return_code {
> > >  	SGX_CHILD_PRESENT		= 13,
> > >  	SGX_INVALID_EINITTOKEN		= 16,
> > >  	SGX_PAGE_NOT_MODIFIABLE		= 20,
> > > +	SGX_INSUFFICIENT_ENTROPY	= 29,
> > > +	SGX_EPC_NOT_READY			= 30,
> > > +	SGX_NO_UPDATE				= 31,
> > >  	SGX_UNMASKED_EVENT		= 128,
> > >  };
> > > 
> > 
> > It doesn't seem SGX_EPC_NOT_READY is used in this series.
> 
> 
> You are right, not anymore. However, it is a valid return code for the EUPDATESVN command.
> Do we want to drop this one? 

I think we should drop if it is not used.