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From: Darren Kenny <darren.kenny@oracle.com>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	x86@kernel.org, linux-sgx@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	Jethro Beekman <jethro@fortanix.com>,
	akpm@linux-foundation.org, andriy.shevchenko@linux.intel.com,
	asapek@google.com, bp@alien8.de, cedric.xing@intel.com,
	chenalexchen@google.com, conradparker@google.com,
	cyhanish@google.com, dave.hansen@intel.com,
	haitao.huang@intel.com, josh@joshtriplett.org,
	kai.huang@intel.com, kai.svahn@intel.com, kmoy@google.com,
	ludloff@google.com, luto@kernel.org, nhorman@redhat.com,
	npmccallum@redhat.com, puiterwijk@redhat.com,
	rientjes@google.com, sean.j.christopherson@intel.com,
	tglx@linutronix.de, yaozhangx@google.com
Subject: Re: [PATCH v36 04/24] x86/sgx: Add SGX microarchitectural data structures
Date: Thu, 06 Aug 2020 14:14:51 +0100
Message-ID: <m27dubsypg.fsf@oracle.com> (raw)
In-Reply-To: <20200716135303.276442-5-jarkko.sakkinen@linux.intel.com>

On Thursday, 2020-07-16 at 16:52:43 +03, Jarkko Sakkinen wrote:
> Define the SGX microarchitectural data structures used by various SGX
> opcodes. This is not an exhaustive representation of all SGX data
> structures but only those needed by the kernel.
>
> The data structures are described in:
>
>   Intel SDM: 37.6 INTEL® SGX DATA STRUCTURES OVERVIEW
>
> Acked-by: Jethro Beekman <jethro@fortanix.com>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

Reviewed-by: Darren Kenny <darren.kenny@oracle.com>

> ---
>  arch/x86/kernel/cpu/sgx/arch.h | 343 +++++++++++++++++++++++++++++++++
>  1 file changed, 343 insertions(+)
>  create mode 100644 arch/x86/kernel/cpu/sgx/arch.h
>
> diff --git a/arch/x86/kernel/cpu/sgx/arch.h b/arch/x86/kernel/cpu/sgx/arch.h
> new file mode 100644
> index 000000000000..ddae55e9d4d8
> --- /dev/null
> +++ b/arch/x86/kernel/cpu/sgx/arch.h
> @@ -0,0 +1,343 @@
> +/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
> +/**
> + * Copyright(c) 2016-18 Intel Corporation.
> + *
> + * Contains data structures defined by the SGX architecture.  Data structures
> + * defined by the Linux software stack should not be placed here.
> + */
> +#ifndef _ASM_X86_SGX_ARCH_H
> +#define _ASM_X86_SGX_ARCH_H
> +
> +#include <linux/bits.h>
> +#include <linux/types.h>
> +
> +#define SGX_CPUID				0x12
> +#define SGX_CPUID_FIRST_VARIABLE_SUB_LEAF	2
> +
> +/**
> + * enum sgx_return_code - The return code type for ENCLS, ENCLU and ENCLV
> + * %SGX_NOT_TRACKED:		Previous ETRACK's shootdown sequence has not
> + *				been completed yet.
> + * %SGX_INVALID_EINITTOKEN:	EINITTOKEN is invalid and enclave signer's
> + *				public key does not match IA32_SGXLEPUBKEYHASH.
> + * %SGX_UNMASKED_EVENT:		An unmasked event, e.g. INTR, was received
> + */
> +enum sgx_return_code {
> +	SGX_NOT_TRACKED			= 11,
> +	SGX_INVALID_EINITTOKEN		= 16,
> +	SGX_UNMASKED_EVENT		= 128,
> +};
> +
> +/**
> + * enum sgx_sub_leaf_types - SGX CPUID variable sub-leaf types
> + * %SGX_CPUID_SUB_LEAF_INVALID:		Indicates this sub-leaf is invalid.
> + * %SGX_CPUID_SUB_LEAF_EPC_SECTION:	Sub-leaf enumerates an EPC section.
> + */
> +enum sgx_sub_leaf_types {
> +	SGX_CPUID_SUB_LEAF_INVALID	= 0x0,
> +	SGX_CPUID_SUB_LEAF_EPC_SECTION	= 0x1,
> +};
> +
> +#define SGX_CPUID_SUB_LEAF_TYPE_MASK	GENMASK(3, 0)
> +
> +#define SGX_MODULUS_SIZE 384
> +
> +/**
> + * enum sgx_miscselect - additional information to an SSA frame
> + * %SGX_MISC_EXINFO:	Report #PF or #GP to the SSA frame.
> + *
> + * Save State Area (SSA) is a stack inside the enclave used to store processor
> + * state when an exception or interrupt occurs. This enum defines additional
> + * information stored to an SSA frame.
> + */
> +enum sgx_miscselect {
> +	SGX_MISC_EXINFO		= BIT(0),
> +};
> +
> +#define SGX_MISC_RESERVED_MASK	GENMASK_ULL(63, 1)
> +
> +#define SGX_SSA_GPRS_SIZE		184
> +#define SGX_SSA_MISC_EXINFO_SIZE	16
> +
> +/**
> + * enum sgx_attributes - the attributes field in &struct sgx_secs
> + * %SGX_ATTR_INIT:		Enclave can be entered (is initialized).
> + * %SGX_ATTR_DEBUG:		Allow ENCLS(EDBGRD) and ENCLS(EDBGWR).
> + * %SGX_ATTR_MODE64BIT:		Tell that this a 64-bit enclave.
> + * %SGX_ATTR_PROVISIONKEY:      Allow to use provisioning keys for remote
> + *				attestation.
> + * %SGX_ATTR_KSS:		Allow to use key separation and sharing (KSS).
> + * %SGX_ATTR_EINITTOKENKEY:	Allow to use token signing key that is used to
> + *				sign cryptographic tokens that can be passed to
> + *				EINIT as an authorization to run an enclave.
> + */
> +enum sgx_attribute {
> +	SGX_ATTR_INIT		= BIT(0),
> +	SGX_ATTR_DEBUG		= BIT(1),
> +	SGX_ATTR_MODE64BIT	= BIT(2),
> +	SGX_ATTR_PROVISIONKEY	= BIT(4),
> +	SGX_ATTR_EINITTOKENKEY	= BIT(5),
> +	SGX_ATTR_KSS		= BIT(7),
> +};
> +
> +#define SGX_ATTR_RESERVED_MASK	(BIT_ULL(3) | BIT_ULL(6) | GENMASK_ULL(63, 8))
> +#define SGX_ATTR_ALLOWED_MASK	(SGX_ATTR_DEBUG | SGX_ATTR_MODE64BIT | \
> +				 SGX_ATTR_KSS)
> +
> +/**
> + * struct sgx_secs - SGX Enclave Control Structure (SECS)
> + * @size:		size of the address space
> + * @base:		base address of the  address space
> + * @ssa_frame_size:	size of an SSA frame
> + * @miscselect:		additional information stored to an SSA frame
> + * @attributes:		attributes for enclave
> + * @xfrm:		XSave-Feature Request Mask (subset of XCR0)
> + * @mrenclave:		SHA256-hash of the enclave contents
> + * @mrsigner:		SHA256-hash of the public key used to sign the SIGSTRUCT
> + * @config_id:		a user-defined value that is used in key derivation
> + * @isv_prod_id:	a user-defined value that is used in key derivation
> + * @isv_svn:		a user-defined value that is used in key derivation
> + * @config_svn:		a user-defined value that is used in key derivation
> + *
> + * SGX Enclave Control Structure (SECS) is a special enclave page that is not
> + * visible in the address space. In fact, this structure defines the address
> + * range and other global attributes for the enclave and it is the first EPC
> + * page created for any enclave. It is moved from a temporary buffer to an EPC
> + * by the means of ENCLS(ECREATE) leaf.
> + */
> +struct sgx_secs {
> +	u64 size;
> +	u64 base;
> +	u32 ssa_frame_size;
> +	u32 miscselect;
> +	u8  reserved1[24];
> +	u64 attributes;
> +	u64 xfrm;
> +	u32 mrenclave[8];
> +	u8  reserved2[32];
> +	u32 mrsigner[8];
> +	u8  reserved3[32];
> +	u32 config_id[16];
> +	u16 isv_prod_id;
> +	u16 isv_svn;
> +	u16 config_svn;
> +	u8  reserved4[3834];
> +} __packed;
> +
> +/**
> + * enum sgx_tcs_flags - execution flags for TCS
> + * %SGX_TCS_DBGOPTIN:	If enabled allows single-stepping and breakpoints
> + *			inside an enclave. It is cleared by EADD but can
> + *			be set later with EDBGWR.
> + */
> +enum sgx_tcs_flags {
> +	SGX_TCS_DBGOPTIN	= 0x01,
> +};
> +
> +#define SGX_TCS_RESERVED_MASK	GENMASK_ULL(63, 1)
> +#define SGX_TCS_RESERVED_SIZE	4024
> +
> +/**
> + * struct sgx_tcs - Thread Control Structure (TCS)
> + * @state:		used to mark an entered TCS
> + * @flags:		execution flags (cleared by EADD)
> + * @ssa_offset:		SSA stack offset relative to the enclave base
> + * @ssa_index:		the current SSA frame index (cleard by EADD)
> + * @nr_ssa_frames:	the number of frame in the SSA stack
> + * @entry_offset:	entry point offset relative to the enclave base
> + * @exit_addr:		address outside the enclave to exit on an exception or
> + *			interrupt
> + * @fs_offset:		offset relative to the enclave base to become FS
> + *			segment inside the enclave
> + * @gs_offset:		offset relative to the enclave base to become GS
> + *			segment inside the enclave
> + * @fs_limit:		size to become a new FS-limit (only 32-bit enclaves)
> + * @gs_limit:		size to become a new GS-limit (only 32-bit enclaves)
> + *
> + * Thread Control Structure (TCS) is an enclave page visible in its address
> + * space that defines an entry point inside the enclave. A thread enters inside
> + * an enclave by supplying address of TCS to ENCLU(EENTER). A TCS can be entered
> + * by only one thread at a time.
> + */
> +struct sgx_tcs {
> +	u64 state;
> +	u64 flags;
> +	u64 ssa_offset;
> +	u32 ssa_index;
> +	u32 nr_ssa_frames;
> +	u64 entry_offset;
> +	u64 exit_addr;
> +	u64 fs_offset;
> +	u64 gs_offset;
> +	u32 fs_limit;
> +	u32 gs_limit;
> +	u8  reserved[SGX_TCS_RESERVED_SIZE];
> +} __packed;
> +
> +/**
> + * struct sgx_pageinfo - an enclave page descriptor
> + * @addr:	address of the enclave page
> + * @contents:	pointer to the page contents
> + * @metadata:	pointer either to a SECINFO or PCMD instance
> + * @secs:	address of the SECS page
> + */
> +struct sgx_pageinfo {
> +	u64 addr;
> +	u64 contents;
> +	u64 metadata;
> +	u64 secs;
> +} __packed __aligned(32);
> +
> +
> +/**
> + * enum sgx_page_type - bits in the SECINFO flags defining the page type
> + * %SGX_PAGE_TYPE_SECS:	a SECS page
> + * %SGX_PAGE_TYPE_TCS:	a TCS page
> + * %SGX_PAGE_TYPE_REG:	a regular page
> + * %SGX_PAGE_TYPE_VA:	a VA page
> + * %SGX_PAGE_TYPE_TRIM:	a page in trimmed state
> + */
> +enum sgx_page_type {
> +	SGX_PAGE_TYPE_SECS,
> +	SGX_PAGE_TYPE_TCS,
> +	SGX_PAGE_TYPE_REG,
> +	SGX_PAGE_TYPE_VA,
> +	SGX_PAGE_TYPE_TRIM,
> +};
> +
> +#define SGX_NR_PAGE_TYPES	5
> +#define SGX_PAGE_TYPE_MASK	GENMASK(7, 0)
> +
> +/**
> + * enum sgx_secinfo_flags - the flags field in &struct sgx_secinfo
> + * %SGX_SECINFO_R:	allow read
> + * %SGX_SECINFO_W:	allow write
> + * %SGX_SECINFO_X:	allow execution
> + * %SGX_SECINFO_SECS:	a SECS page
> + * %SGX_SECINFO_TCS:	a TCS page
> + * %SGX_SECINFO_REG:	a regular page
> + * %SGX_SECINFO_VA:	a VA page
> + * %SGX_SECINFO_TRIM:	a page in trimmed state
> + */
> +enum sgx_secinfo_flags {
> +	SGX_SECINFO_R			= BIT(0),
> +	SGX_SECINFO_W			= BIT(1),
> +	SGX_SECINFO_X			= BIT(2),
> +	SGX_SECINFO_SECS		= (SGX_PAGE_TYPE_SECS << 8),
> +	SGX_SECINFO_TCS			= (SGX_PAGE_TYPE_TCS << 8),
> +	SGX_SECINFO_REG			= (SGX_PAGE_TYPE_REG << 8),
> +	SGX_SECINFO_VA			= (SGX_PAGE_TYPE_VA << 8),
> +	SGX_SECINFO_TRIM		= (SGX_PAGE_TYPE_TRIM << 8),
> +};
> +
> +#define SGX_SECINFO_PERMISSION_MASK	GENMASK_ULL(2, 0)
> +#define SGX_SECINFO_PAGE_TYPE_MASK	(SGX_PAGE_TYPE_MASK << 8)
> +#define SGX_SECINFO_RESERVED_MASK	~(SGX_SECINFO_PERMISSION_MASK | \
> +					  SGX_SECINFO_PAGE_TYPE_MASK)
> +
> +/**
> + * struct sgx_secinfo - describes attributes of an EPC page
> + * @flags:	permissions and type
> + *
> + * Used together with ENCLS leaves that add or modify an EPC page to an
> + * enclave to define page permissions and type.
> + */
> +struct sgx_secinfo {
> +	u64 flags;
> +	u8  reserved[56];
> +} __packed __aligned(64);
> +
> +#define SGX_PCMD_RESERVED_SIZE 40
> +
> +/**
> + * struct sgx_pcmd - Paging Crypto Metadata (PCMD)
> + * @enclave_id:	enclave identifier
> + * @mac:	MAC over PCMD, page contents and isvsvn
> + *
> + * PCMD is stored for every swapped page to the regular memory. When ELDU loads
> + * the page back it recalculates the MAC by using a isvsvn number stored in a
> + * VA page. Together these two structures bring integrity and rollback
> + * protection.
> + */
> +struct sgx_pcmd {
> +	struct sgx_secinfo secinfo;
> +	u64 enclave_id;
> +	u8  reserved[SGX_PCMD_RESERVED_SIZE];
> +	u8  mac[16];
> +} __packed __aligned(128);
> +
> +#define SGX_SIGSTRUCT_RESERVED1_SIZE 84
> +#define SGX_SIGSTRUCT_RESERVED2_SIZE 20
> +#define SGX_SIGSTRUCT_RESERVED3_SIZE 32
> +#define SGX_SIGSTRUCT_RESERVED4_SIZE 12
> +
> +/**
> + * struct sgx_sigstruct_header -  defines author of the enclave
> + * @header1:		constant byte string
> + * @vendor:		must be either 0x0000 or 0x8086
> + * @date:		YYYYMMDD in BCD
> + * @header2:		costant byte string
> + * @swdefined:		software defined value
> + */
> +struct sgx_sigstruct_header {
> +	u64 header1[2];
> +	u32 vendor;
> +	u32 date;
> +	u64 header2[2];
> +	u32 swdefined;
> +	u8  reserved1[84];
> +} __packed;
> +
> +/**
> + * struct sgx_sigstruct_body - defines contents of the enclave
> + * @miscselect:		additional information stored to an SSA frame
> + * @misc_mask:		required miscselect in SECS
> + * @attributes:		attributes for enclave
> + * @xfrm:		XSave-Feature Request Mask (subset of XCR0)
> + * @attributes_mask:	required attributes in SECS
> + * @xfrm_mask:		required XFRM in SECS
> + * @mrenclave:		SHA256-hash of the enclave contents
> + * @isvprodid:		a user-defined value that is used in key derivation
> + * @isvsvn:		a user-defined value that is used in key derivation
> + */
> +struct sgx_sigstruct_body {
> +	u32 miscselect;
> +	u32 misc_mask;
> +	u8  reserved2[20];
> +	u64 attributes;
> +	u64 xfrm;
> +	u64 attributes_mask;
> +	u64 xfrm_mask;
> +	u8  mrenclave[32];
> +	u8  reserved3[32];
> +	u16 isvprodid;
> +	u16 isvsvn;
> +} __packed;
> +
> +/**
> + * struct sgx_sigstruct - an enclave signature
> + * @header:		defines author of the enclave
> + * @modulus:		the modulus of the public key
> + * @exponent:		the exponent of the public key
> + * @signature:		the signature calculated over the fields except modulus,
> + * @body:		defines contents of the enclave
> + * @q1:			a value used in RSA signature verification
> + * @q2:			a value used in RSA signature verification
> + *
> + * Header and body are the parts that are actual signed. The remaining fields
> + * define the signature of the enclave.
> + */
> +struct sgx_sigstruct {
> +	struct sgx_sigstruct_header header;
> +	u8  modulus[SGX_MODULUS_SIZE];
> +	u32 exponent;
> +	u8  signature[SGX_MODULUS_SIZE];
> +	struct sgx_sigstruct_body body;
> +	u8  reserved4[12];
> +	u8  q1[SGX_MODULUS_SIZE];
> +	u8  q2[SGX_MODULUS_SIZE];
> +} __packed;
> +
> +#define SGX_LAUNCH_TOKEN_SIZE 304
> +
> +#endif /* _ASM_X86_SGX_ARCH_H */
> -- 
> 2.25.1

  reply index

Thread overview: 80+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-16 13:52 [PATCH v36 00/24] Intel SGX foundations Jarkko Sakkinen
2020-07-16 13:52 ` [PATCH v36 01/24] x86/cpufeatures: x86/msr: Add Intel SGX hardware bits Jarkko Sakkinen
2020-08-06 13:13   ` Darren Kenny
2020-07-16 13:52 ` [PATCH v36 02/24] x86/cpufeatures: x86/msr: Add Intel SGX Launch Control " Jarkko Sakkinen
2020-08-06 13:14   ` Darren Kenny
2020-07-16 13:52 ` [PATCH v36 03/24] x86/mm: x86/sgx: Signal SIGSEGV with PF_SGX Jarkko Sakkinen
2020-08-06 13:16   ` Darren Kenny
2020-08-20 15:31   ` Borislav Petkov
2020-08-21 17:35     ` Jarkko Sakkinen
2020-07-16 13:52 ` [PATCH v36 04/24] x86/sgx: Add SGX microarchitectural data structures Jarkko Sakkinen
2020-08-06 13:14   ` Darren Kenny [this message]
2020-07-16 13:52 ` [PATCH v36 05/24] x86/sgx: Add wrappers for ENCLS leaf functions Jarkko Sakkinen
2020-08-07  9:37   ` Darren Kenny
2020-07-16 13:52 ` [PATCH v36 06/24] x86/cpu/intel: Detect SGX support Jarkko Sakkinen
2020-08-06 13:17   ` Darren Kenny
2020-07-16 13:52 ` [PATCH v36 07/24] x86/cpu/intel: Add nosgx kernel parameter Jarkko Sakkinen
2020-08-06 13:18   ` Darren Kenny
2020-07-16 13:52 ` [PATCH v36 08/24] x86/sgx: Initialize metadata for Enclave Page Cache (EPC) sections Jarkko Sakkinen
2020-08-06 13:27   ` Darren Kenny
2020-07-16 13:52 ` [PATCH v36 09/24] x86/sgx: Add __sgx_alloc_epc_page() and sgx_free_epc_page() Jarkko Sakkinen
2020-08-06 13:29   ` Darren Kenny
2020-07-16 13:52 ` [PATCH v36 10/24] mm: Add vm_ops->mprotect() Jarkko Sakkinen
2020-08-06 13:35   ` Darren Kenny
2020-07-16 13:52 ` [PATCH v36 11/24] x86/sgx: Add SGX enclave driver Jarkko Sakkinen
2020-08-06 13:59   ` Darren Kenny
2020-08-25 16:44   ` Borislav Petkov
2020-08-26 13:46     ` Jarkko Sakkinen
2020-07-16 13:52 ` [PATCH v36 12/24] x86/sgx: Add SGX_IOC_ENCLAVE_CREATE Jarkko Sakkinen
2020-08-06 15:40   ` Darren Kenny
2020-08-26 14:52   ` Borislav Petkov
2020-08-27 13:24     ` Jarkko Sakkinen
2020-08-27 16:15       ` Borislav Petkov
2020-08-28 23:39         ` Jarkko Sakkinen
2020-08-29  0:21       ` Jarkko Sakkinen
2020-09-01 16:41   ` Haitao Huang
2020-09-04 11:55     ` Jarkko Sakkinen
2020-07-16 13:52 ` [PATCH v36 13/24] x86/sgx: Add SGX_IOC_ENCLAVE_ADD_PAGES Jarkko Sakkinen
2020-08-06 16:29   ` Darren Kenny
2020-07-16 13:52 ` [PATCH v36 14/24] x86/sgx: Add SGX_IOC_ENCLAVE_INIT Jarkko Sakkinen
2020-08-06 16:40   ` Darren Kenny
2020-07-16 13:52 ` [PATCH v36 15/24] x86/sgx: Allow a limited use of ATTRIBUTE.PROVISIONKEY for attestation Jarkko Sakkinen
2020-08-06 17:00   ` Darren Kenny
2020-08-18 13:30     ` Jarkko Sakkinen
2020-07-16 13:52 ` [PATCH v36 16/24] x86/sgx: Add a page reclaimer Jarkko Sakkinen
2020-07-16 13:52 ` [PATCH v36 17/24] x86/sgx: ptrace() support for the SGX driver Jarkko Sakkinen
2020-07-16 13:52 ` [PATCH v36 18/24] x86/vdso: Add support for exception fixup in vDSO functions Jarkko Sakkinen
2020-07-16 13:52 ` [PATCH v36 19/24] x86/fault: Add helper function to sanitize error code Jarkko Sakkinen
2020-07-16 13:52 ` [PATCH v36 20/24] x86/traps: Attempt to fixup exceptions in vDSO before signaling Jarkko Sakkinen
2020-07-16 13:53 ` [PATCH v36 21/24] x86/vdso: Implement a vDSO for Intel SGX enclave call Jarkko Sakkinen
2020-08-06 14:55   ` Nathaniel McCallum
2020-08-10 22:23     ` Sean Christopherson
2020-08-11  7:16       ` Jethro Beekman
2020-08-11 14:54         ` Sean Christopherson
2020-08-18 14:52       ` Jarkko Sakkinen
2020-08-18 15:06         ` Jarkko Sakkinen
2020-08-18 15:15           ` Nathaniel McCallum
2020-08-18 16:43             ` Jarkko Sakkinen
2020-08-19 13:33               ` Nathaniel McCallum
2020-08-19 14:00                 ` Jethro Beekman
2020-08-19 21:23                 ` Jarkko Sakkinen
2020-08-10 23:08     ` Andy Lutomirski
2020-08-10 23:48       ` Sean Christopherson
2020-08-11  0:52         ` Andy Lutomirski
2020-08-11 15:16           ` Andy Lutomirski
2020-08-13 19:38             ` Sean Christopherson
2020-08-17 13:12       ` Nathaniel McCallum
2020-08-17 15:01         ` Andy Lutomirski
2020-08-18 15:15       ` Jarkko Sakkinen
2020-08-20  0:19         ` Andy Lutomirski
2020-08-18 14:26     ` Jarkko Sakkinen
2020-07-16 13:53 ` [PATCH v36 22/24] selftests/x86: Add a selftest for SGX Jarkko Sakkinen
2020-08-27  4:47   ` Nathaniel McCallum
2020-08-27 15:20     ` Sean Christopherson
2020-08-28 23:27       ` Jarkko Sakkinen
2020-07-16 13:53 ` [PATCH v36 23/24] docs: x86/sgx: Document SGX micro architecture and kernel internals Jarkko Sakkinen
2020-07-28 21:35   ` Pavel Machek
2020-08-06 10:21     ` Dr. Greg
2020-08-08 22:18       ` Pavel Machek
2020-08-19 20:55     ` Jarkko Sakkinen
2020-07-16 13:53 ` [PATCH v36 24/24] x86/sgx: Update MAINTAINERS Jarkko Sakkinen

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Linux-Sgx Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-sgx/0 linux-sgx/git/0.git

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	public-inbox-index linux-sgx

Example config snippet for mirrors

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