From: Borislav Petkov <bp@suse.de>
To: Kyle Huey <me@kylehuey.com>
Cc: "Robert O'Callahan" <robert@ocallahan.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Andy Lutomirski" <luto@kernel.org>,
"Ingo Molnar" <mingo@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, "Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Jeff Dike" <jdike@addtoit.com>,
"Richard Weinberger" <richard@nod.at>,
"Alexander Viro" <viro@zeniv.linux.org.uk>,
"Shuah Khan" <shuah@kernel.org>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Boris Ostrovsky" <boris.ostrovsky@oracle.com>,
"Len Brown" <len.brown@intel.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
"Dmitry Safonov" <dsafonov@virtuozzo.com>,
"David Matlack" <dmatlack@google.com>,
"Nadav Amit" <nadav.amit@gmail.com>,
linux-kernel@vger.kernel.org,
user-mode-linux-devel@lists.sourceforge.net,
user-mode-linux-user@lists.sourceforge.net,
linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org,
kvm@vger.kernel.org
Subject: Re: [PATCH v12 5/7] x86/cpufeature: Detect CPUID faulting support
Date: Thu, 17 Nov 2016 17:51:54 +0100 [thread overview]
Message-ID: <20161117165154.knskynwyjpzqglnd@pd.tnic> (raw)
In-Reply-To: <20161117020610.5302-6-khuey@kylehuey.com>
On Wed, Nov 16, 2016 at 06:06:08PM -0800, Kyle Huey wrote:
> Intel supports faulting on the CPUID instruction beginning with Ivy Bridge.
> When enabled, the processor will fault on attempts to execute the CPUID
> instruction with CPL>0. This will allow a ptracer to emulate the CPUID
> instruction.
>
> Bit 31 of MSR_PLATFORM_INFO advertises support for this feature. It is
> documented in detail in Section 2.3.2 of
> https://bugzilla.kernel.org/attachment.cgi?id=243991
>
> Detect support for this feature and expose it as X86_FEATURE_CPUID_FAULT.
>
> Signed-off-by: Kyle Huey <khuey@kylehuey.com>
> ---
> arch/x86/include/asm/cpufeatures.h | 1 +
> arch/x86/include/asm/msr-index.h | 2 ++
> arch/x86/kernel/cpu/intel.c | 12 ++++++++++++
> 3 files changed, 15 insertions(+)
Reviewed-by: Borislav Petkov <bp@suse.de>
--
Regards/Gruss,
Boris.
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--
next prev parent reply other threads:[~2016-11-17 17:04 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-17 2:06 [PATCH v12 0/7] x86/arch_prctl Add ARCH_[GET|SET]_CPUID for controlling the CPUID instruction Kyle Huey
2016-11-17 2:06 ` [PATCH v12 1/7] x86/arch_prctl/64: Use SYSCALL_DEFINE2 to define sys_arch_prctl Kyle Huey
2016-11-17 2:06 ` [PATCH v12 2/7] x86/arch_prctl/64: Rename do_arch_prctl to do_arch_prctl_64 Kyle Huey
2016-11-18 7:27 ` Ingo Molnar
2016-11-18 7:28 ` Thomas Gleixner
2016-11-18 8:16 ` Ingo Molnar
2016-11-18 16:39 ` Kyle Huey
2016-11-29 9:26 ` Ingo Molnar
2016-11-17 2:06 ` [PATCH v12 3/7] x86/arch_prctl: Add do_arch_prctl_common Kyle Huey
2016-11-17 2:06 ` [PATCH v12 4/7] x86/syscalls/32: Wire up arch_prctl on x86-32 Kyle Huey
2016-11-18 7:30 ` Ingo Molnar
2016-11-17 2:06 ` [PATCH v12 5/7] x86/cpufeature: Detect CPUID faulting support Kyle Huey
2016-11-17 16:51 ` Borislav Petkov [this message]
2016-11-17 2:06 ` [PATCH v12 6/7] x86/arch_prctl: Add ARCH_[GET|SET]_CPUID Kyle Huey
2016-11-18 8:14 ` Ingo Molnar
2016-11-18 8:49 ` Thomas Gleixner
2016-11-21 8:27 ` Ingo Molnar
2016-11-22 17:26 ` Andy Lutomirski
2016-11-18 15:55 ` Kyle Huey
2016-11-18 17:32 ` Andy Lutomirski
2016-11-17 2:06 ` [PATCH v12 7/7] KVM: x86: virtualize cpuid faulting Kyle Huey
2016-11-17 12:31 ` Paolo Bonzini
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