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From: Borislav Petkov <bp@alien8.de>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: x86@kernel.org, linux-sgx@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	Andy Lutomirski <luto@amacapital.net>,
	Jethro Beekman <jethro@fortanix.com>,
	akpm@linux-foundation.org, andriy.shevchenko@linux.intel.com,
	asapek@google.com, 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, tglx@linutronix.de, yaozhangx@google.com
Subject: Re: [PATCH v38 18/24] x86/vdso: Add support for exception fixup in vDSO functions
Date: Thu, 24 Sep 2020 00:07:12 +0200
Message-ID: <20200923220712.GU28545@zn.tnic> (raw)
In-Reply-To: <20200915112842.897265-19-jarkko.sakkinen@linux.intel.com>

On Tue, Sep 15, 2020 at 02:28:36PM +0300, Jarkko Sakkinen wrote:
> From: Sean Christopherson <sean.j.christopherson@intel.com>
> 
> The basic concept and implementation is very similar to the kernel's
> exception fixup mechanism.  The key differences are that the kernel
> handler is hardcoded and the fixup entry addresses are relative to
> the overall table as opposed to individual entries.

...

This gist of this commit message should be also in
Documentation/x86/sgx.rst

And I already said the same thing during v33 review:

"That is a very good explanation and I would prefer if it would be in a
sgx-specific README or so instead of it getting lost in git..."

...

> diff --git a/arch/x86/entry/vdso/extable.h b/arch/x86/entry/vdso/extable.h
> new file mode 100644
> index 000000000000..aafdac396948
> --- /dev/null
> +++ b/arch/x86/entry/vdso/extable.h
> @@ -0,0 +1,29 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __VDSO_EXTABLE_H
> +#define __VDSO_EXTABLE_H
> +
> +/*
> + * Inject exception fixup for vDSO code.  Unlike normal exception fixup,
> + * vDSO uses a dedicated handler the addresses are relative to the overall
> + * exception table, not each individual entry.
> + */
> +#ifdef __ASSEMBLY__
> +#define _ASM_VDSO_EXTABLE_HANDLE(from, to)	\
> +	ASM_VDSO_EXTABLE_HANDLE from to
> +
> +.macro ASM_VDSO_EXTABLE_HANDLE from:req to:req
> +	.pushsection __ex_table, "a"
> +	.long (\from) - __ex_table
> +	.long (\to) - __ex_table
> +	.popsection
> +.endm
> +#else
> +#define _ASM_VDSO_EXTABLE_HANDLE(from, to)	\
> +	".pushsection __ex_table, \"a\"\n"      \
> +	".long (" #from ") - __ex_table\n"      \
> +	".long (" #to ") - __ex_table\n"        \
> +	".popsection\n"
> +#endif
> +
> +#endif /* __VDSO_EXTABLE_H */
> +

Also from last time:

.git/rebase-apply/patch:122: new blank line at EOF.
+


-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

  reply index

Thread overview: 182+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-15 11:28 [PATCH v38 00/24] Intel SGX foundations Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 01/24] x86/cpufeatures: x86/msr: Add Intel SGX hardware bits Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 02/24] x86/cpufeatures: x86/msr: Add Intel SGX Launch Control " Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 03/24] x86/mm: x86/sgx: Signal SIGSEGV with PF_SGX Jarkko Sakkinen
2020-09-16 11:44   ` Borislav Petkov
2020-09-16 20:30     ` Jarkko Sakkinen
2020-09-16 20:32       ` Borislav Petkov
2020-09-15 11:28 ` [PATCH v38 04/24] x86/sgx: Add SGX microarchitectural data structures Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 05/24] x86/sgx: Add wrappers for ENCLS leaf functions Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 06/24] x86/cpu/intel: Detect SGX support Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 07/24] x86/cpu/intel: Add nosgx kernel parameter Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 08/24] x86/sgx: Initialize metadata for Enclave Page Cache (EPC) sections Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 09/24] x86/sgx: Add __sgx_alloc_epc_page() and sgx_free_epc_page() Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 10/24] mm: Add vm_ops->mprotect() Jarkko Sakkinen
2020-09-18 12:44   ` Borislav Petkov
2020-09-18 15:09   ` Andy Lutomirski
2020-09-18 23:24     ` [PATCH v38 10/24] mm: Add vm_ops->mprotect()' Jarkko Sakkinen
2020-09-18 23:53     ` [PATCH v38 10/24] mm: Add vm_ops->mprotect() Sean Christopherson
2020-09-19  0:15       ` Andy Lutomirski
     [not found]         ` <20200922125801.GA133710@linux.intel.com>
2020-09-22 15:11           ` Dave Hansen
2020-09-23 13:30             ` Jarkko Sakkinen
2020-09-23 13:43             ` Jarkko Sakkinen
2020-09-23 14:33             ` Jarkko Sakkinen
2020-09-24 14:50               ` Dave Hansen
2020-09-24 16:27                 ` Sean Christopherson
     [not found]       ` <20200921124946.GF6038@linux.intel.com>
2020-09-21 12:51         ` Jarkko Sakkinen
2020-09-21 13:14         ` Jarkko Sakkinen
     [not found]         ` <20200921165758.GA24156@linux.intel.com>
2020-09-21 21:07           ` Jarkko Sakkinen
2020-09-21 21:18             ` Sean Christopherson
2020-09-22  5:29               ` Jarkko Sakkinen
2020-09-22  5:35                 ` Jarkko Sakkinen
2020-09-22 16:43                   ` Sean Christopherson
2020-09-23 13:50                     ` Jarkko Sakkinen
2020-09-24 19:11                       ` Haitao Huang
2020-09-24 19:28                         ` Sean Christopherson
2020-09-24 19:39                           ` Dave Hansen
2020-09-24 20:01                             ` Sean Christopherson
2020-09-24 20:10                               ` Dave Hansen
2020-09-24 20:25                                 ` Sean Christopherson
2020-09-24 20:54                                   ` Dave Hansen
2020-09-24 23:05                                     ` Sean Christopherson
2020-09-24 23:09                                       ` Dave Hansen
2020-09-25  0:00                                         ` Sean Christopherson
2020-09-25 17:18                                           ` Dave Hansen
2020-09-25 19:43                                             ` Sean Christopherson
2020-09-25 19:53                                               ` Dave Hansen
2020-09-26  4:15                                                 ` Andy Lutomirski
2020-09-28  0:53                                                 ` Jarkko Sakkinen
2020-09-28 14:04                                                   ` Dave Hansen
2020-09-28 16:19                                                     ` Jarkko Sakkinen
2020-09-28 16:48                                                       ` Dave Hansen
2020-09-28 19:32                                                         ` Jarkko Sakkinen
2020-09-28 19:45                                                           ` Dave Hansen
2020-09-28 20:19                                                             ` Jarkko Sakkinen
2020-09-29  1:37                                                               ` Andy Lutomirski
2020-09-29  4:05                                                                 ` Jarkko Sakkinen
2020-09-29 14:24                                                                   ` Dave Hansen
2020-09-30  0:20                                                                     ` Jarkko Sakkinen
2020-09-30 14:35                                                                       ` Dave Hansen
2020-09-28 20:18                                                         ` Jarkko Sakkinen
2020-10-18  8:49                                                     ` Dr. Greg
2020-10-19 21:31                                                       ` Sean Christopherson
2020-10-20 10:01                                                         ` Dr. Greg
2020-10-20 16:40                                                           ` Sean Christopherson
2020-10-24 14:37                                                             ` Dr. Greg
2020-10-24 15:33                                                               ` Andy Lutomirski
2020-10-26 10:51                                                                 ` Dr. Greg
2020-10-26 22:59                                                                   ` Andy Lutomirski
2020-10-27  0:40                                                                     ` Sean Christopherson
2020-09-24 22:07                                 ` Jarkko Sakkinen
2020-09-24 21:58                           ` Jarkko Sakkinen
2020-09-24 21:55                         ` Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 11/24] x86/sgx: Add SGX enclave driver Jarkko Sakkinen
2020-09-21  9:30   ` Borislav Petkov
2020-09-21 12:09     ` Jarkko Sakkinen
2020-10-01 17:36   ` Sean Christopherson
2020-10-01 18:49     ` Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 12/24] x86/sgx: Add SGX_IOC_ENCLAVE_CREATE Jarkko Sakkinen
2020-09-21 10:03   ` Borislav Petkov
2020-09-21 12:28     ` Jarkko Sakkinen
2020-09-21 13:51       ` Borislav Petkov
2020-09-21 19:29         ` Jarkko Sakkinen
2020-10-03  0:23   ` Haitao Huang
2020-10-03  3:24     ` Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 13/24] x86/sgx: Add SGX_IOC_ENCLAVE_ADD_PAGES Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 14/24] x86/sgx: Add SGX_IOC_ENCLAVE_INIT Jarkko Sakkinen
2020-09-21 17:35   ` Borislav Petkov
2020-09-21 18:10     ` Sean Christopherson
2020-09-21 18:27       ` Borislav Petkov
     [not found]         ` <20200921191658.GA24823@linux.intel.com>
2020-09-22  8:29           ` Borislav Petkov
2020-09-22 11:50             ` Jarkko Sakkinen
2020-09-22 12:56             ` Jethro Beekman
2020-09-22 14:29               ` Borislav Petkov
2020-09-23 14:47                 ` Jarkko Sakkinen
2020-09-23 15:55                   ` Borislav Petkov
2020-09-24 12:23                     ` Jarkko Sakkinen
2020-09-22 16:29               ` Sean Christopherson
2020-09-21 19:22       ` Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 15/24] x86/sgx: Enable provisioning for remote attestation Jarkko Sakkinen
2020-09-21 18:07   ` Borislav Petkov
2020-09-21 19:27     ` Jarkko Sakkinen
2020-09-21 19:41       ` Borislav Petkov
2020-09-21 21:26         ` Jarkko Sakkinen
2020-09-22  8:30           ` Borislav Petkov
2020-09-15 11:28 ` [PATCH v38 16/24] x86/sgx: Add a page reclaimer Jarkko Sakkinen
2020-09-22 10:45   ` Borislav Petkov
2020-09-22 14:03     ` Jarkko Sakkinen
2020-09-22 14:24       ` Borislav Petkov
2020-09-23 14:52         ` Jarkko Sakkinen
2020-09-29  1:14       ` Sean Christopherson
2020-09-29  3:50         ` Jarkko Sakkinen
2020-09-29  8:35           ` Sean Christopherson
2020-09-22 16:24     ` Sean Christopherson
2020-09-22 18:02       ` Borislav Petkov
2020-09-23 15:25       ` Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 17/24] x86/sgx: ptrace() support for the SGX driver Jarkko Sakkinen
2020-09-22 15:44   ` Borislav Petkov
2020-09-23 13:20     ` Jarkko Sakkinen
2020-09-23 16:17       ` Borislav Petkov
2020-09-24 11:51         ` Jarkko Sakkinen
2020-09-24 15:57           ` Borislav Petkov
2020-09-24 20:38             ` [PATCH v38 17/24] x86/sgx: ptrace() support for the SGX driver' Jarkko Sakkinen
2020-09-24 20:40               ` Jarkko Sakkinen
2020-09-25  7:53                 ` Borislav Petkov
2020-09-25 11:00                   ` Jarkko Sakkinen
2020-09-25  7:51               ` Borislav Petkov
2020-09-25 11:21                 ` Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 18/24] x86/vdso: Add support for exception fixup in vDSO functions Jarkko Sakkinen
2020-09-23 22:07   ` Borislav Petkov [this message]
2020-09-24 12:09     ` Jarkko Sakkinen
2020-09-24 16:00       ` Borislav Petkov
2020-09-24 21:07         ` Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 19/24] x86/fault: Add helper function to sanitize error code Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 20/24] x86/traps: Attempt to fixup exceptions in vDSO before signaling Jarkko Sakkinen
2020-09-24 16:31   ` Borislav Petkov
2020-09-24 23:11     ` Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 21/24] x86/vdso: Implement a vDSO for Intel SGX enclave call Jarkko Sakkinen
2020-09-24 18:04   ` Borislav Petkov
2020-09-25  1:00     ` Jarkko Sakkinen
2020-09-25  8:28       ` Borislav Petkov
2020-09-27 23:37         ` Jarkko Sakkinen
2020-09-28  8:30           ` Borislav Petkov
2020-09-28 15:02             ` Jarkko Sakkinen
2020-09-25  8:39       ` Jethro Beekman
2020-09-25 11:17         ` Jarkko Sakkinen
2020-09-25 11:43           ` Jethro Beekman
     [not found]     ` <20200925003808.GB20333@linux.intel.com>
2020-09-25  1:04       ` Jarkko Sakkinen
2020-09-25  8:14       ` Borislav Petkov
2020-09-25 10:59         ` Jarkko Sakkinen
2020-09-28 14:36       ` Jarkko Sakkinen
2020-09-25 18:23   ` Andrew Cooper
2020-09-28  0:58     ` Jarkko Sakkinen
2020-09-28 16:44       ` Andrew Cooper
2020-09-28 18:07         ` H.J. Lu
2020-09-28 18:12           ` Andy Lutomirski
2020-09-28 18:17             ` Dave Hansen
2020-09-28 22:07               ` Jarkko Sakkinen
2020-09-28 21:56             ` Jarkko Sakkinen
2020-09-28 22:06               ` H.J. Lu
2020-09-28 22:18                 ` Dave Hansen
2020-09-28 22:41                   ` Andy Lutomirski
2020-09-28 23:38                     ` Andrew Cooper
2020-09-29 14:10                       ` Dave Hansen
2020-09-29 15:01                         ` Andrew Cooper
2020-09-28 21:41           ` Jarkko Sakkinen
2020-09-28 20:42         ` Jarkko Sakkinen
2020-09-28 23:52           ` Andrew Cooper
2020-09-30  0:52             ` Jarkko Sakkinen
2020-09-28 15:43     ` Yu, Yu-cheng
2020-09-28 15:54       ` H.J. Lu
2020-09-28 16:40         ` Yu, Yu-cheng
2020-09-28 21:36         ` Jarkko Sakkinen
2020-09-28 20:56       ` Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 22/24] selftests/x86: Add a selftest for SGX Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 23/24] docs: x86/sgx: Document SGX micro architecture and kernel internals Jarkko Sakkinen
2020-09-23 13:50   ` Borislav Petkov
2020-09-24 11:28     ` Jarkko Sakkinen
2020-09-24 15:54       ` Borislav Petkov
2020-09-15 11:28 ` [PATCH v38 24/24] x86/sgx: Update MAINTAINERS Jarkko Sakkinen
2020-09-25 22:37   ` Sean Christopherson
2020-09-28  0:44     ` Jarkko Sakkinen
  -- strict thread matches above, loose matches on Subject: below --
2020-09-15 11:04 [PATCH v38 00/24] Intel SGX foundations Jarkko Sakkinen
2020-09-15 11:05 ` [PATCH v38 18/24] x86/vdso: Add support for exception fixup in vDSO functions Jarkko Sakkinen

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