linux-kernel - Re: [PATCH 1/6] x86/sgx: Do not consider unsanitized pages an error

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Date:   Wed, 31 Aug 2022 21:44:28 +0300
From:   "jarkko@...nel.org" <jarkko@...nel.org>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Haitao Huang <haitao.huang@...ux.intel.com>,
        "Huang, Kai" <kai.huang@...el.com>,
        "pmenzel@...gen.mpg.de" <pmenzel@...gen.mpg.de>,
        "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "Dhanraj, Vijay" <vijay.dhanraj@...el.com>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "bp@...en8.de" <bp@...en8.de>, "hpa@...or.com" <hpa@...or.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/6] x86/sgx: Do not consider unsanitized pages an error

On Wed, Aug 31, 2022 at 11:35:10AM -0700, Dave Hansen wrote:
> Jarkko, Kai and Haitao,
> 
> Can you three please start trimming your replies?  You don't need to and
> should not quote the entirety of your messages every time you reply.
> 
> On 8/31/22 11:28, jarkko@...nel.org wrote:
> >> Will it cause racing if we expose dev nodes to user space before
> >> ksgxd is started and sensitization done?
> > I'll to explain this.
> > 
> > So the point is to fix the issue at hand, and fix it locally.
> > 
> > Changing initialization order is simply out of context. It's
> > not really an argument for or against changing it
> > 
> > We are fixing sanitization here, and only that with zero
> > side-effects to any other semantics.
> > 
> > It's dictated by the development process [*] but more
> > importantly it's also just plain common sense.
> 
> Kai, I think your suggestion is reasonable.  You make a good point about
> not needing ksgxd for vepc.
> 
> *But*, I think it's a bit too much for a bugfix that's headed to
> -stable.  I'm concerned that it will have unintended side effects,
> *especially* when there's a working, tested alternative.

Yeah, I also actually *do* agree that the suggestions could
be reasonable.

BR, Jarkko