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From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Borislav Petkov <bp@alien8.de>
Cc: 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, 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, josh@joshtriplett.org,
	luto@kernel.org, kai.huang@intel.com, rientjes@google.com,
	cedric.xing@intel.com, puiterwijk@redhat.com
Subject: Re: [PATCH v24 08/24] x86/sgx: Enumerate and track EPC sections
Date: Wed, 18 Dec 2019 07:19:44 -0800
Message-ID: <20191218151944.GA25201@linux.intel.com> (raw)
In-Reply-To: <20191218091856.GA24886@zn.tnic>

On Wed, Dec 18, 2019 at 10:18:56AM +0100, Borislav Petkov wrote:
> On Sat, Nov 30, 2019 at 01:13:10AM +0200, Jarkko Sakkinen wrote:
> > +static bool __init sgx_alloc_epc_section(u64 addr, u64 size,
> > +					 unsigned long index,
> > +					 struct sgx_epc_section *section)
> > +{
> > +	unsigned long nr_pages = size >> PAGE_SHIFT;
> 
> I'm assuming here that size which gets communicated through CPUID -
> which is an interesting way to communicate SGX settings in itself :-) - is
> in multiples of 4K? SDM doesn't say...

Yes, EPC pages are architecturally defined to be 4k sized and aligned.

  36.5 Enclave Page Cache

  The EPC is divided into EPC pages. An EPC page is 4KB in size and always
  aligned on a 4KB boundary.

  reply index

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-29 23:13 [PATCH v24 00/24] Intel SGX foundations Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 01/24] x86/sgx: Update MAINTAINERS Jarkko Sakkinen
2019-11-30  1:38   ` Neil Horman
2019-11-30 14:37     ` Dr. Greg
2019-12-02  9:24       ` Jethro Beekman
2019-12-06 21:23     ` Jarkko Sakkinen
2019-12-06 21:24       ` Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 02/24] x86/cpufeatures: x86/msr: Add Intel SGX hardware bits Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 03/24] x86/cpufeatures: x86/msr: Intel SGX Launch Control " Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 04/24] x86/mm: x86/sgx: Signal SIGSEGV with PF_SGX Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 05/24] x86/sgx: Add SGX microarchitectural data structures Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 06/24] x86/sgx: Add wrappers for ENCLS leaf functions Jarkko Sakkinen
2019-12-17 14:45   ` Borislav Petkov
2019-12-19  0:39     ` Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 07/24] x86/cpu/intel: Detect SGX supprt Jarkko Sakkinen
2019-12-17 15:17   ` Borislav Petkov
2019-12-19  0:42     ` Jarkko Sakkinen
2019-12-19  6:15       ` Borislav Petkov
2019-12-23  9:46   ` Borislav Petkov
2019-12-27  6:00     ` Jarkko Sakkinen
2020-01-14 18:36     ` Sean Christopherson
2019-11-29 23:13 ` [PATCH v24 08/24] x86/sgx: Enumerate and track EPC sections Jarkko Sakkinen
2019-12-18  9:18   ` Borislav Petkov
2019-12-18 15:19     ` Sean Christopherson [this message]
2019-12-18 16:18       ` Borislav Petkov
2019-12-19  0:53     ` Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 09/24] x86/sgx: Add functions to allocate and free EPC pages Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 10/24] x86/sgx: Add sgx_einit() for wrapping ENCLS[EINIT] Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 11/24] mm: Introduce vm_ops->may_mprotect() Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 12/24] x86/sgx: Linux Enclave Driver Jarkko Sakkinen
2019-12-02 15:48   ` Haitao Huang
2019-12-02 18:21     ` Sean Christopherson
2019-12-09 19:38       ` Jarkko Sakkinen
2019-12-09 19:08     ` Jarkko Sakkinen
2020-01-14 16:12   ` Haitao Huang
2020-01-23 12:31     ` Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 13/24] selftests/x86: Recurse into subdirectories Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 14/24] selftests/x86: Add a selftest for SGX Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 15/24] x86/sgx: Add provisioning Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 16/24] x86/sgx: Add a page reclaimer Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 17/24] x86/sgx: ptrace() support for the SGX driver Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 18/24] x86/vdso: Add support for exception fixup in vDSO functions Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 19/24] x86/fault: Add helper function to sanitize error code Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 20/24] x86/traps: Attempt to fixup exceptions in vDSO before signaling Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 21/24] x86/vdso: Add __vdso_sgx_enter_enclave() to wrap SGX enclave transitions Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 22/24] selftests/x86: Add vDSO selftest for SGX Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 23/24] docs: x86/sgx: Document microarchitecture Jarkko Sakkinen
2019-11-29 23:13 ` [PATCH v24 24/24] docs: x86/sgx: Document kernel internals Jarkko Sakkinen
2019-12-20 13:26 ` [PATCH v24 00/24] Intel SGX foundations Nathaniel McCallum

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