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From: "Haitao Huang" <haitao.huang@linux.intel.com>
To: "Nathaniel McCallum" <npmccallum@redhat.com>
Cc: "Sean Christopherson" <sean.j.christopherson@intel.com>,
	"Jarkko Sakkinen" <jarkko.sakkinen@linux.intel.com>,
	linux-kernel@vger.kernel.org, x86@kernel.org,
	linux-sgx@vger.kernel.org, akpm@linux-foundation.org,
	dave.hansen@intel.com, "Neil Horman" <nhorman@redhat.com>,
	"Huang, Haitao" <haitao.huang@intel.com>,
	andriy.shevchenko@linux.intel.com, tglx@linutronix.de, "Svahn,
	Kai" <kai.svahn@intel.com>,
	bp@alien8.de, "Josh Triplett" <josh@joshtriplett.org>,
	luto@kernel.org, kai.huang@intel.com,
	"David Rientjes" <rientjes@google.com>,
	"Xing, Cedric" <cedric.xing@intel.com>,
	"Patrick Uiterwijk" <puiterwijk@redhat.com>
Subject: Re: [PATCH v29 00/20] Intel SGX foundations
Date: Thu, 07 May 2020 17:31:39 -0500
Message-ID: <op.0j9p6106wjvjmi@hhuan26-mobl1.amr.corp.intel.com> (raw)
In-Reply-To: <CAOASepNVckens=wiWpHj291EAo0ndi7GCVHd9j7BPn8rjy7Ykg@mail.gmail.com>

On Thu, 07 May 2020 11:49:15 -0500, Nathaniel McCallum  
<npmccallum@redhat.com> wrote:

> On Thu, May 7, 2020 at 1:03 AM Haitao Huang
> <haitao.huang@linux.intel.com> wrote:
>>
>> On Wed, 06 May 2020 17:14:22 -0500, Sean Christopherson
>> <sean.j.christopherson@intel.com> wrote:
>>
>> > On Wed, May 06, 2020 at 05:42:42PM -0400, Nathaniel McCallum wrote:
>> >> Tested on Enarx. This requires a patch[0] for v29 support.
>> >>
>> >> Tested-by: Nathaniel McCallum <npmccallum@redhat.com>
>> >>
>> >> However, we did uncover a small usability issue. See below.
>> >>
>> >> [0]:
>> >>  
>> https://github.com/enarx/enarx/pull/507/commits/80da2352aba46aa7bc6b4d1fccf20fe1bda58662
>> >
>> > ...
>> >
>> >> > * Disallow mmap(PROT_NONE) from /dev/sgx. Any mapping (e.g.
>> >> anonymous) can
>> >> >   be used to reserve the address range. Now /dev/sgx supports only
>> >> opaque
>> >> >   mappings to the (initialized) enclave data.
>> >>
>> >> The statement "Any mapping..." isn't actually true.
>> >>
>> >> Enarx creates a large enclave (currently 64GiB). This worked when we
>> >> created a file-backed mapping on /dev/sgx/enclave. However, switching
>> >> to an anonymous mapping fails with ENOMEM. We suspect this is because
>> >> the kernel attempts to allocate all the pages and zero them but there
>> >> is insufficient RAM available. We currently work around this by
>> >> creating a shared mapping on /dev/zero.
>> >
>> > Hmm, the kernel shouldn't actually allocate physical pages unless  
>> they're
>> > written.  I'll see if I can reproduce.
>> >
>>
>> For larger size mmap, I think it requires enabling vm overcommit mode 1:
>> echo 1 | sudo tee /proc/sys/vm/overcommit_memory
>
> Which means the default experience isn't good.
>


Yes, it is not good default. But this is not sgx specific IIUC. Normal  
applications would have the same issue if they ask for large mapping than  
whatever limit kernel enforces by default.

  parent reply index

Thread overview: 83+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-21 21:52 Jarkko Sakkinen
2020-04-21 21:52 ` [PATCH v29 01/20] x86/sgx: Update MAINTAINERS Jarkko Sakkinen
2020-04-21 21:52 ` [PATCH v29 02/20] x86/cpufeatures: x86/msr: Add Intel SGX hardware bits Jarkko Sakkinen
2020-04-21 21:52 ` [PATCH v29 03/20] x86/cpufeatures: x86/msr: Intel SGX Launch Control " Jarkko Sakkinen
2020-04-21 21:53 ` [PATCH v29 04/20] x86/mm: x86/sgx: Signal SIGSEGV with PF_SGX Jarkko Sakkinen
2020-04-21 21:53 ` [PATCH v29 05/20] x86/sgx: Add SGX microarchitectural data structures Jarkko Sakkinen
2020-04-21 21:53 ` [PATCH v29 06/20] x86/sgx: Add wrappers for ENCLS leaf functions Jarkko Sakkinen
2020-04-21 21:53 ` [PATCH v29 07/20] x86/cpu/intel: Detect SGX support Jarkko Sakkinen
2020-04-21 21:53 ` [PATCH v29 08/20] x86/sgx: Enumerate and track EPC sections Jarkko Sakkinen
2020-04-21 21:53 ` [PATCH v29 09/20] x86/sgx: Add functions to allocate and free EPC pages Jarkko Sakkinen
2020-04-21 21:53 ` [PATCH v29 10/20] mm: Introduce vm_ops->may_mprotect() Jarkko Sakkinen
2020-04-21 21:53 ` [PATCH v29 11/20] x86/sgx: Linux Enclave Driver Jarkko Sakkinen
2020-05-08 19:09   ` Sean Christopherson
2020-04-21 21:53 ` [PATCH v29 12/20] x86/sgx: Add provisioning Jarkko Sakkinen
2020-04-21 21:53 ` [PATCH v29 13/20] x86/sgx: Add a page reclaimer Jarkko Sakkinen
2020-04-21 21:53 ` [PATCH v29 14/20] x86/sgx: ptrace() support for the SGX driver Jarkko Sakkinen
2020-05-06 21:50   ` Sean Christopherson
2020-05-13 21:40     ` Jarkko Sakkinen
2020-04-21 21:53 ` [PATCH v29 15/20] x86/vdso: Add support for exception fixup in vDSO functions Jarkko Sakkinen
2020-04-21 21:53 ` [PATCH v29 16/20] x86/fault: Add helper function to sanitize error code Jarkko Sakkinen
2020-04-21 21:53 ` [PATCH v29 17/20] x86/traps: Attempt to fixup exceptions in vDSO before signaling Jarkko Sakkinen
2020-04-21 21:53 ` [PATCH v29 18/20] x86/vdso: Implement a vDSO for Intel SGX enclave call Jarkko Sakkinen
2020-04-21 21:53 ` [PATCH v29 19/20] selftests/x86: Add a selftest for SGX Jarkko Sakkinen
2020-04-21 21:53 ` [PATCH v29 20/20] docs: x86/sgx: Document SGX micro architecture and kernel internals Jarkko Sakkinen
2020-04-22 16:48 ` [PATCH v29 00/20] Intel SGX foundations Connor Kuehl
2020-04-29  5:22   ` Jarkko Sakkinen
2020-04-26 16:57 ` Dr. Greg
2020-04-29  5:23   ` Jarkko Sakkinen
2020-04-29 15:14     ` Sean Christopherson
2020-04-30  3:59       ` Jarkko Sakkinen
2020-05-02 23:05         ` Dr. Greg
2020-05-03  0:48           ` Andy Lutomirski
2020-05-04  9:34             ` Dr. Greg
2020-04-29 15:30   ` Sean Christopherson
2020-05-08  0:40     ` Andy Lutomirski
2020-05-07  0:41   ` Thomas Gleixner
2020-05-08 19:02     ` Dr. Greg
2020-05-08 19:56       ` Sean Christopherson
2020-05-14  9:16         ` Dr. Greg
2020-05-14 16:15           ` Sean Christopherson
2020-05-14 16:20             ` Borislav Petkov
2020-05-14 19:29               ` Thomas Gleixner
2020-05-15  9:28               ` Jarkko Sakkinen
2020-05-15  9:42                 ` Borislav Petkov
2020-05-15 16:24                   ` Jarkko Sakkinen
2020-05-15  0:09             ` Jarkko Sakkinen
2020-05-15 19:54           ` Nathaniel McCallum
2020-05-16  9:58             ` Jarkko Sakkinen
2020-05-24 21:27           ` Pavel Machek
2020-05-26  8:16             ` David Laight
2020-04-26 17:03 ` Dr. Greg
2020-04-29 15:27 ` Jethro Beekman
2020-04-30  3:46   ` Jarkko Sakkinen
2020-04-30  7:19     ` Jethro Beekman
2020-04-30  8:23       ` Jarkko Sakkinen
2020-04-30 14:12         ` Jethro Beekman
2020-05-06 12:16           ` Jarkko Sakkinen
2020-05-06 16:39 ` Jordan Hand
2020-05-07 18:06   ` Dr. Greg
2020-05-08 16:16     ` Jordan Hand
2020-05-13 23:09   ` Jarkko Sakkinen
2020-05-06 21:42 ` Nathaniel McCallum
2020-05-06 22:14   ` Sean Christopherson
2020-05-07  5:02     ` Haitao Huang
2020-05-07 16:49       ` Nathaniel McCallum
2020-05-07 19:34         ` Sean Christopherson
2020-05-07 22:35           ` Haitao Huang
2020-05-08  0:25             ` Sean Christopherson
2020-05-28 11:15               ` Jarkko Sakkinen
2020-05-28 11:19                 ` Jarkko Sakkinen
2020-05-07 22:31         ` Haitao Huang [this message]
2020-05-13 22:14   ` Jarkko Sakkinen
2020-05-13 22:18     ` Jarkko Sakkinen
2020-05-14  6:31     ` Jethro Beekman
2020-05-14 19:30     ` Thomas Gleixner
2020-05-15  0:22       ` Jarkko Sakkinen
2020-05-08 19:08 ` Sean Christopherson
2020-05-14 19:05   ` Seth Moore
2020-05-15  0:23     ` Jarkko Sakkinen
2020-05-12 11:55 ` Hui, Chunyang
2020-05-12 16:51   ` Dr. Greg
2020-05-14 10:49   ` Jarkko Sakkinen
2020-05-16  8:53 ` [PATCH] x86/cpu/intel: Add nosgx kernel parameter Jarkko Sakkinen

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