From: Kyle Huey <me@kylehuey.com>
To: "Robert O'Callahan" <robert@ocallahan.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<x86@kernel.org>, Jeff Dike <jdike@addtoit.com>,
Richard Weinberger <richard@nod.at>,
Andy Lutomirski <luto@kernel.org>, Borislav Petkov <bp@suse.de>,
Dmitry Safonov <dsafonov@virtuozzo.com>,
Peter Zijlstra <peterz@infradead.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Shuah Khan <shuah@kernel.org>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Len Brown <len.brown@intel.com>
Cc: open list <linux-kernel@vger.kernel.org>,
"open list:USER-MODE LINUX (UML)"
<user-mode-linux-devel@lists.sourceforge.net>,
"open list:USER-MODE LINUX (UML)"
<user-mode-linux-user@lists.sourceforge.net>,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@vger.kernel.org>,
Linux API <linux-api@vger.kernel.org>
Subject: Re: [PATCH v7 0/6] x86/arch_prctl Add ARCH_[GET|SET]_CPUID for controlling the CPUID instruction
Date: Mon, 24 Oct 2016 22:30:58 -0700 [thread overview]
Message-ID: <CAP045Apcsb3dVJ1PaDpbJSGmtxK23GRijKWFt5qcBxTnzoyMJQ@mail.gmail.com> (raw)
In-Reply-To: <20161019020333.3766-1-khuey@kylehuey.com>
On Tue, Oct 18, 2016 at 7:03 PM, Kyle Huey <me@kylehuey.com> wrote:
> rr (http://rr-project.org/), a userspace record-and-replay reverse-
> execution debugger, would like to trap and emulate the CPUID instruction.
> This would allow us to a) mask away certain hardware features that rr does
> not support (e.g. RDRAND) and b) enable trace portability across machines
> by providing constant results.
>
> Newer Intel CPUs (Ivy Bridge and later) can fault when CPUID is executed at
> CPL > 0. Expose this capability to userspace as a new pair of arch_prctls,
> ARCH_GET_CPUID and ARCH_SET_CPUID, with two values, ARCH_CPUID_ENABLE and
> ARCH_CPUID_SIGSEGV.
>
> v6 did not get any feedback, so I included the changes since v5.
>
> Since v6:
> - Rebased to 4.9-rc1 (primarily over the new VDSO arch_prctls and the new pkey
> entries in the syscall table)
>
> Since v5:
>
> Patch 3:
> - do_arch_prctl is again do_arch_prctl_common
>
> Patch 6:
> - Added static qualifiers on get/set_cpuid_mode
> - Braced ifs in disable/enable_cpuid
> - Renamed arch_post_exec to arch_setup_new_exec
>
A friendly ping. Has anybody had an opportunity to look at this patch
series again? Any feedback, positive or negative, would be greatly
appreciated.
- Kyle
next prev parent reply other threads:[~2016-10-25 5:31 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-19 2:03 [PATCH v7 0/6] x86/arch_prctl Add ARCH_[GET|SET]_CPUID for controlling the CPUID instruction Kyle Huey
2016-10-19 2:03 ` [PATCH v7 1/6] x86/arch_prctl/64: Use SYSCALL_DEFINE2 to define sys_arch_prctl Kyle Huey
2016-10-19 2:03 ` [PATCH v7 2/6] x86/arch_prctl/64: Rename do_arch_prctl to do_arch_prctl_64 Kyle Huey
2016-10-19 2:03 ` [PATCH v7 3/6] x86/arch_prctl: Add do_arch_prctl_common Kyle Huey
2016-10-19 2:03 ` [PATCH v7 4/6] x86/syscalls/32: Wire up arch_prctl on x86-32 Kyle Huey
2016-10-19 2:03 ` [PATCH v7 5/6] x86/cpufeature: Detect CPUID faulting support Kyle Huey
2016-10-27 8:21 ` Thomas Gleixner
2016-10-19 2:03 ` [PATCH v7 6/6] x86/arch_prctl: Add ARCH_[GET|SET]_CPUID Kyle Huey
2016-10-27 11:15 ` Thomas Gleixner
2016-10-27 22:34 ` Andy Lutomirski
2016-10-27 22:38 ` Thomas Gleixner
2016-10-25 5:30 ` Kyle Huey [this message]
2016-10-25 16:47 ` [PATCH v7 0/6] x86/arch_prctl Add ARCH_[GET|SET]_CPUID for controlling the CPUID instruction Thomas Gleixner
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