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From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: Jethro Beekman <jethro@fortanix.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
	Andy Lutomirski <luto@kernel.org>,
	"x86@kernel.org" <x86@kernel.org>,
	"linux-sgx@vger.kernel.org" <linux-sgx@vger.kernel.org>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"dave.hansen@intel.com" <dave.hansen@intel.com>,
	"nhorman@redhat.com" <nhorman@redhat.com>,
	"npmccallum@redhat.com" <npmccallum@redhat.com>,
	"serge.ayoun@intel.com" <serge.ayoun@intel.com>,
	"shay.katz-zamir@intel.com" <shay.katz-zamir@intel.com>,
	"haitao.huang@intel.com" <haitao.huang@intel.com>,
	"andriy.shevchenko@linux.intel.com" 
	<andriy.shevchenko@linux.intel.com>,
	"tglx@linutronix.de" <tglx@linutronix.de>,
	"kai.svahn@intel.com" <kai.svahn@intel.com>,
	"bp@alien8.de" <bp@alien8.de>,
	"josh@joshtriplett.org" <josh@joshtriplett.org>,
	"kai.huang@intel.com" <kai.huang@intel.com>,
	"rientjes@google.com" <rientjes@google.com>,
	Suresh Siddha <suresh.b.siddha@intel.com>
Subject: Re: [PATCH v19 16/27] x86/sgx: Add the Linux SGX Enclave Driver
Date: Tue, 2 Apr 2019 01:57:17 +0300
Message-ID: <20190401225717.GA13450@linux.intel.com> (raw)
In-Reply-To: <a09d23ef-e1f3-906a-d58f-e39b02311d1b@fortanix.com>

On Mon, Apr 01, 2019 at 05:25:11PM +0000, Jethro Beekman wrote:
> On 2019-04-01 03:01, Jarkko Sakkinen wrote:
> > On Fri, Mar 29, 2019 at 09:20:05AM -0700, Sean Christopherson wrote:
> > > On Thu, Mar 28, 2019 at 12:05:39PM -0700, Andy Lutomirski wrote:
> > > > On Thu, Mar 28, 2019 at 6:19 AM Jarkko Sakkinen
> > > > <jarkko.sakkinen@linux.intel.com> wrote:
> > > > > 
> > > > > On Wed, Mar 27, 2019 at 01:06:11PM -0700, Sean Christopherson wrote:
> > > > > > I agree with all of the above, but unfortunately blacklisting is really
> > > > > > the only benefit that would be realized by modularizing the driver.  The
> > > > > > "driver" at this point is just the device and its ioctls, the meat of
> > > > > > the functionality has been moved into the subsystem proper.  And the few
> > > > > > remaining tidbits of functionality, e.g. sgx_encl_page_alloc() and
> > > > > > sgx_encl_alloc(), probably should be moved out of ioctl.c as well.
> > > > > 
> > > > > That is kind of core reason of having an LKM here, to wrap the uapi. It
> > > > > is not about reducing size of the kernel. It is about ability to tailor
> > > > > the uapi on stock kernels.
> > > > > 
> > > > 
> > > > As I see it, there is really only one significant benefit of modules:
> > > > reducing the size of the kernel in the case that the module isn't
> > > > loaded.
> > > 
> > > This is a much more succinct explanation of what I was attempting to say.
> > > 
> > > >   (And organizing module parameters, I suppose, but you don't,
> > > > strictly speaking, need to be able to build as a module to do that.)
> > > > SGX can be blacklisted by booting with nosgx (or, if if can't, then
> > > > that should be added).
> > > 
> > > The split lock detection series also proposed extending clearcpuid to
> > > take flags by name, a dedicated 'nosgx' may not even be necessary in the
> > > long run.
> > > 
> > > https://lkml.kernel.org/r/1549084491-57808-6-git-send-email-fenghua.yu@intel.com
> > > https://lkml.kernel.org/r/1549084491-57808-7-git-send-email-fenghua.yu@intel.com
> > > https://lkml.kernel.org/r/1549084491-57808-8-git-send-email-fenghua.yu@intel.com
> > 
> > OK, that's great. Then I just rework the LKM out...
> 
> Wait, why? I don't agree with Andy's "only" reason for LKMs, and it sounded
> like you agree.

For me the rationale for having LKM was that you can enable/disable the
functionality. For that the kernel command line would be sufficient.

I will roll v20 w/o taking it away since this is still clearly something
not concluded (won't affect other changes).

/Jarkko

  reply index

Thread overview: 92+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-17 21:14 [PATCH v19 00/27] Intel SGX1 support Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 01/27] x86/cpufeatures: Add Intel-defined SGX feature bit Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 02/27] x86/cpufeatures: Add SGX sub-features (as Linux-defined bits) Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 03/27] x86/msr: Add IA32_FEATURE_CONTROL.SGX_ENABLE definition Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 04/27] x86/cpufeatures: Add Intel-defined SGX_LC feature bit Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 05/27] x86/msr: Add SGX Launch Control MSR definitions Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 06/27] x86/mm: x86/sgx: Add new 'PF_SGX' page fault error code bit Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 07/27] x86/mm: x86/sgx: Signal SIGSEGV for userspace #PFs w/ PF_SGX Jarkko Sakkinen
2019-03-18 17:15   ` Dave Hansen
2019-03-18 19:53     ` Sean Christopherson
2019-03-17 21:14 ` [PATCH v19 08/27] x86/cpu/intel: Detect SGX support and update caps appropriately Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 09/27] x86/sgx: Add ENCLS architectural error codes Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 10/27] x86/sgx: Add SGX1 and SGX2 architectural data structures Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 11/27] x86/sgx: Add definitions for SGX's CPUID leaf and variable sub-leafs Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 12/27] x86/sgx: Enumerate and track EPC sections Jarkko Sakkinen
2019-03-18 19:50   ` Sean Christopherson
2019-03-21 14:40     ` Jarkko Sakkinen
2019-03-21 15:28       ` Sean Christopherson
2019-03-22 10:19         ` Jarkko Sakkinen
2019-03-22 10:50           ` Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 13/27] x86/sgx: Add wrappers for ENCLS leaf functions Jarkko Sakkinen
2019-03-19 19:59   ` Sean Christopherson
2019-03-21 14:51     ` Jarkko Sakkinen
2019-03-21 15:40       ` Sean Christopherson
2019-03-22 11:00         ` Jarkko Sakkinen
2019-03-22 16:43           ` Sean Christopherson
2019-03-17 21:14 ` [PATCH v19 16/27] x86/sgx: Add the Linux SGX Enclave Driver Jarkko Sakkinen
2019-03-19 21:19   ` Sean Christopherson
2019-03-21 15:51     ` Jarkko Sakkinen
2019-03-21 16:47       ` Sean Christopherson
2019-03-22 11:10         ` Jarkko Sakkinen
2019-03-26 13:26       ` Jarkko Sakkinen
2019-03-26 23:58         ` Sean Christopherson
2019-03-27  5:28           ` Jarkko Sakkinen
2019-03-27 17:57             ` Sean Christopherson
2019-03-27 18:38             ` Jethro Beekman
2019-03-27 20:06               ` Sean Christopherson
2019-03-28  1:21                 ` Jethro Beekman
2019-03-28 13:19                 ` Jarkko Sakkinen
2019-03-28 19:05                   ` Andy Lutomirski
2019-03-29  9:43                     ` Jarkko Sakkinen
2019-03-29 16:20                     ` Sean Christopherson
2019-04-01 10:01                       ` Jarkko Sakkinen
2019-04-01 17:25                         ` Jethro Beekman
2019-04-01 22:57                           ` Jarkko Sakkinen [this message]
2019-03-28 13:15               ` Jarkko Sakkinen
2019-03-19 23:00   ` Sean Christopherson
2019-03-21 16:18     ` Jarkko Sakkinen
2019-03-21 17:38       ` Sean Christopherson
2019-03-22 11:17         ` Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 17/27] x86/sgx: Add provisioning Jarkko Sakkinen
2019-03-19 20:09   ` Sean Christopherson
2019-03-21  2:08     ` Huang, Kai
2019-03-21 14:32       ` Jarkko Sakkinen
2019-03-21 21:41         ` Huang, Kai
2019-03-22 11:31           ` Jarkko Sakkinen
2019-03-21 14:30     ` Jarkko Sakkinen
2019-03-21 14:38   ` Nathaniel McCallum
2019-03-22 11:22     ` Jarkko Sakkinen
2019-03-21 16:50   ` Andy Lutomirski
2019-03-22 11:29     ` Jarkko Sakkinen
2019-03-22 11:43       ` Jarkko Sakkinen
2019-03-22 18:20         ` Andy Lutomirski
2019-03-25 14:55           ` Jarkko Sakkinen
2019-03-27  0:14             ` Sean Christopherson
2019-04-05 10:18             ` Jarkko Sakkinen
2019-04-05 13:53               ` Andy Lutomirski
2019-04-05 14:20                 ` Jarkko Sakkinen
2019-04-05 14:34                   ` Greg KH
2019-04-09 13:37                     ` Jarkko Sakkinen
2019-04-05 14:21                 ` Greg KH
2019-03-17 21:14 ` [PATCH v19 19/27] x86/sgx: ptrace() support for the SGX driver Jarkko Sakkinen
2019-03-19 22:22   ` Sean Christopherson
2019-03-21 15:02     ` Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 20/27] x86/vdso: Add support for exception fixup in vDSO functions Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 21/27] x86/fault: Add helper function to sanitize error code Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 22/27] x86/fault: Attempt to fixup unhandled #PF in vDSO before signaling Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 23/27] x86/traps: Attempt to fixup exceptions " Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 25/27] x86/sgx: SGX documentation Jarkko Sakkinen
2019-03-20 17:14   ` Sean Christopherson
2019-03-21 16:24     ` Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 26/27] selftests/x86: Add a selftest for SGX Jarkko Sakkinen
2019-03-17 21:14 ` [PATCH v19 27/27] x86/sgx: Update MAINTAINERS Jarkko Sakkinen
2019-03-19 17:12   ` Sean Christopherson
2019-03-21 14:42     ` Jarkko Sakkinen
     [not found] ` <20190317211456.13927-19-jarkko.sakkinen@linux.intel.com>
2019-03-19 22:09   ` [PATCH v19 18/27] x86/sgx: Add swapping code to the core and SGX driver Sean Christopherson
2019-03-21 14:59     ` Jarkko Sakkinen
2019-03-19 23:41 ` [PATCH v19 00/27] Intel SGX1 support Sean Christopherson
2019-03-19 23:52   ` Jethro Beekman
2019-03-20  0:22     ` Sean Christopherson
2019-03-21 16:20     ` Jarkko Sakkinen
2019-03-21 16:00   ` Jarkko Sakkinen

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