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From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: Randy Dunlap <rdunlap@infradead.org>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
	linux-sgx@vger.kernel.org, akpm@linux-foundation.org,
	dave.hansen@intel.com, sean.j.christopherson@intel.com,
	nhorman@redhat.com, npmccallum@redhat.com, serge.ayoun@intel.com,
	shay.katz-zamir@intel.com, haitao.huang@intel.com,
	andriy.shevchenko@linux.intel.com, tglx@linutronix.de,
	kai.svahn@intel.com, bp@alien8.de, josh@joshtriplett.org,
	luto@kernel.org, kai.huang@intel.com, rientjes@google.com,
	cedric.xing@intel.com
Subject: Re: [PATCH v22 24/24] docs: x86/sgx: Document kernel internals
Date: Tue, 1 Oct 2019 22:34:26 +0300
Message-ID: <20191001193307.GB12699@linux.intel.com> (raw)
In-Reply-To: <97dbd2a8-f1e5-a3f9-dac7-f1f4d6b6cd4c@infradead.org>

On Fri, Sep 27, 2019 at 10:07:10AM -0700, Randy Dunlap wrote:
> On 9/3/19 7:26 AM, Jarkko Sakkinen wrote:
> > From: Sean Christopherson <sean.j.christopherson@intel.com>
> > 
> > Document some of the more tricky parts of the kernel implementation
> > internals.
> > 
> > Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> > Co-developed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> 
> Hi,
> Some edits for you to consider.

Thank you, great comments!

> > +ultimately all the launch decisions token are not needed for anything.  We
> 
>    ultimately makes all the launch decisions, tokens are not

Here I rephrased the whole sentence as tokens are only single purpose.
The current form implies as if they were multipurpose. Also the last
sentence was just the first sentence rephrased differently.

I also more information about the launch and I ended up with this:

"The current kernel implementation supports only writable MSRs. The launch is
performed by setting the MSRs to the hash of the public key modulus of the
enclave signer and a token with the valid bit set to zero.

If the MSRs were read-only, the platform would need to provide a launch enclave
(LE), which would be signed with the key matching the MSRs. The LE creates
cryptographic tokens for other enclaves that they can pass together with their
signature to the ENCLS(EINIT) opcode, which is used to initialize enclaves."

/Jarkko

  reply index

Thread overview: 102+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-03 14:26 [PATCH v22 00/24] Intel SGX foundations Jarkko Sakkinen
2019-09-03 14:26 ` [PATCH v22 01/24] x86/cpufeatures: x86/msr: Add Intel SGX hardware bits Jarkko Sakkinen
2019-09-24 15:28   ` Borislav Petkov
2019-09-24 16:11     ` Sean Christopherson
2019-09-24 16:25       ` Borislav Petkov
2019-09-03 14:26 ` [PATCH v22 02/24] x86/cpufeatures: x86/msr: Intel SGX Launch Control " Jarkko Sakkinen
2019-09-24 15:52   ` Borislav Petkov
2019-09-24 20:22     ` Sean Christopherson
2019-09-25  8:51       ` Borislav Petkov
2019-09-25 17:18         ` Sean Christopherson
2019-09-25 18:31           ` Borislav Petkov
2019-09-25 19:08             ` Sean Christopherson
2019-09-27 16:11           ` Jarkko Sakkinen
2019-09-25 14:09     ` Jarkko Sakkinen
2019-09-25 14:10       ` Jarkko Sakkinen
2019-09-25 14:38         ` Jarkko Sakkinen
2019-09-25 15:19       ` Borislav Petkov
2019-09-25 16:49         ` Sean Christopherson
2019-09-25 17:28           ` Borislav Petkov
2019-09-25 18:18             ` Sean Christopherson
2019-09-03 14:26 ` [PATCH v22 03/24] x86/mm: x86/sgx: Signal SIGSEGV with PF_SGX Jarkko Sakkinen
2019-09-24 16:04   ` Borislav Petkov
2019-09-25 14:16     ` Jarkko Sakkinen
2019-09-03 14:26 ` [PATCH v22 04/24] x86/cpu/intel: Detect SGX supprt Jarkko Sakkinen
2019-09-24 16:13   ` Borislav Petkov
2019-09-24 17:43     ` Sean Christopherson
2019-09-24 18:21       ` Borislav Petkov
2019-09-25 14:46         ` Jarkko Sakkinen
2019-09-03 14:26 ` [PATCH v22 05/24] x86/sgx: Add ENCLS architectural error codes Jarkko Sakkinen
2019-09-27 10:20   ` Borislav Petkov
2019-09-27 16:08     ` Jarkko Sakkinen
2019-09-27 17:20       ` Sean Christopherson
2019-10-01 20:23         ` Jarkko Sakkinen
2019-09-03 14:26 ` [PATCH v22 06/24] x86/sgx: Add SGX microarchitectural data structures Jarkko Sakkinen
2019-09-27 16:27   ` Borislav Petkov
2019-10-01 19:10     ` Jarkko Sakkinen
2019-10-01 20:39     ` Jarkko Sakkinen
2019-09-03 14:26 ` [PATCH v22 07/24] x86/sgx: Add wrappers for ENCLS leaf functions Jarkko Sakkinen
2019-10-04  9:45   ` Borislav Petkov
2019-10-04 18:56     ` Jarkko Sakkinen
2019-10-08  4:04     ` Sean Christopherson
2019-10-08  7:18       ` Borislav Petkov
2019-10-08 13:35         ` Sean Christopherson
2019-10-08 14:56           ` Borislav Petkov
2019-09-03 14:26 ` [PATCH v22 08/24] x86/sgx: Enumerate and track EPC sections Jarkko Sakkinen
2019-10-05  9:26   ` Borislav Petkov
2019-10-07 11:58     ` Jarkko Sakkinen
2019-09-03 14:26 ` [PATCH v22 09/24] x86/sgx: Add functions to allocate and free EPC pages Jarkko Sakkinen
2019-10-05 16:44   ` Borislav Petkov
2019-10-07 14:50     ` Sean Christopherson
2019-10-08  9:09       ` Borislav Petkov
2019-10-08 13:31         ` Sean Christopherson
2019-10-07 17:55     ` Jarkko Sakkinen
2019-10-07 18:09       ` Borislav Petkov
2019-09-03 14:26 ` [PATCH v22 10/24] x86/sgx: Add sgx_einit() for wrapping ENCLS[EINIT] Jarkko Sakkinen
2019-10-08 17:30   ` Borislav Petkov
2019-10-08 17:45     ` Sean Christopherson
2019-10-08 17:46       ` Sean Christopherson
2019-10-08 17:53         ` Borislav Petkov
2019-09-03 14:26 ` [PATCH v22 11/24] mm: Introduce vm_ops->may_mprotect() Jarkko Sakkinen
2019-10-08 17:41   ` Borislav Petkov
2019-09-03 14:26 ` [PATCH v22 12/24] x86/sgx: Linux Enclave Driver Jarkko Sakkinen
2019-10-08 17:59   ` Borislav Petkov
2019-10-08 18:17     ` Sean Christopherson
2019-10-08 19:19       ` Borislav Petkov
2019-09-03 14:26 ` [PATCH v22 13/24] x86/sgx: Add provisioning Jarkko Sakkinen
2019-09-03 14:26 ` [PATCH v22 14/24] x86/sgx: Add a page reclaimer Jarkko Sakkinen
2019-09-03 14:26 ` [PATCH v22 15/24] x86/sgx: ptrace() support for the SGX driver Jarkko Sakkinen
2019-09-03 14:26 ` [PATCH v22 16/24] x86/vdso: Add support for exception fixup in vDSO functions Jarkko Sakkinen
2019-10-02 23:18   ` Jarkko Sakkinen
2019-10-02 23:45     ` Jarkko Sakkinen
2019-10-04  0:03     ` Sean Christopherson
2019-10-04 18:49       ` Jarkko Sakkinen
2019-10-04  0:15     ` Sean Christopherson
2019-10-04 18:52       ` Jarkko Sakkinen
2019-10-05 15:54         ` Sean Christopherson
2019-10-07  7:57           ` Jarkko Sakkinen
2019-10-07  8:10             ` Jarkko Sakkinen
2019-10-07 12:04               ` Jarkko Sakkinen
2019-10-08  4:54                 ` Sean Christopherson
2019-10-05 18:39         ` Sean Christopherson
2019-10-07  8:01           ` Jarkko Sakkinen
2019-10-06 23:38         ` Jarkko Sakkinen
2019-10-06 23:40           ` Jarkko Sakkinen
2019-09-03 14:26 ` [PATCH v22 17/24] x86/fault: Add helper function to sanitize error code Jarkko Sakkinen
2019-09-03 14:26 ` [PATCH v22 18/24] x86/traps: Attempt to fixup exceptions in vDSO before signaling Jarkko Sakkinen
2019-09-03 14:26 ` [PATCH v22 19/24] x86/vdso: Add __vdso_sgx_enter_enclave() to wrap SGX enclave transitions Jarkko Sakkinen
2019-09-03 14:26 ` [PATCH v22 20/24] selftests/x86: Add a selftest for SGX Jarkko Sakkinen
2019-09-03 14:26 ` [PATCH v22 21/24] selftests/x86: Recurse into subdirectories Jarkko Sakkinen
2019-09-03 14:26 ` [PATCH v22 22/24] x86/sgx: Update MAINTAINERS Jarkko Sakkinen
2019-09-03 14:26 ` [PATCH v22 23/24] docs: x86/sgx: Document microarchitecture Jarkko Sakkinen
2019-09-27 18:15   ` Randy Dunlap
2019-09-03 14:26 ` [PATCH v22 24/24] docs: x86/sgx: Document kernel internals Jarkko Sakkinen
2019-09-27 17:07   ` Randy Dunlap
2019-10-01 19:34     ` Jarkko Sakkinen [this message]
2019-09-13 20:38 ` [PATCH v22 00/24] Intel SGX foundations Dave Hansen
2019-09-14 13:41   ` Jarkko Sakkinen
2019-09-14 15:32     ` Dave Hansen
2019-09-16  5:23       ` Jarkko Sakkinen
2019-09-24 17:20         ` Andy Lutomirski
2019-09-25 14:32           ` Jarkko Sakkinen
2019-10-02 23:42             ` Jarkko Sakkinen

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