From: Kyle Huey <me@kylehuey.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: "Robert O'Callahan" <robert@ocallahan.org>,
"Andy Lutomirski" <luto@kernel.org>,
"Ingo Molnar" <mingo@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<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>,
"Borislav Petkov" <bp@suse.de>,
"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>,
"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:FILESYSTEMS (VFS and infrastructure)"
<linux-fsdevel@vger.kernel.org>,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@vger.kernel.org>,
"kvm list" <kvm@vger.kernel.org>
Subject: Re: [PATCH v10 5/7] x86/cpufeature: Detect CPUID faulting support
Date: Tue, 8 Nov 2016 11:38:25 -0800 [thread overview]
Message-ID: <CAP045ApgFPBVoQLKyC0t46Axy=fYF53ToNM2AK1ghCqbGRi6TQ@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1611082002160.3501@nanos>
On Tue, Nov 8, 2016 at 11:06 AM, Thomas Gleixner <tglx@linutronix.de> wrote:
> On Tue, 8 Nov 2016, 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
>> http://www.intel.com/content/dam/www/public/us/en/documents/application-notes/virtualization-technology-flexmigration-application-note.pdf
Done. https://bugzilla.kernel.org/attachment.cgi?id=243991
> Can you please stick that document into the kernel bugzilla, as it's going
> to be on a different place before this gets merged into Linus tree?
>
> See: http://lkml.kernel.org/r/1478631281-5061-1-git-send-email-kan.liang@intel.com
>
>> + static const struct msr_bit msr_bits[] = {
>> + { X86_FEATURE_CPUID_FAULT, MSR_PLATFORM_INFO, 31 },
>
> Can you please make that PLATINFO_CPUID_FAULT_BIT instead of 31?
Sure.
- Kyle
next prev parent reply other threads:[~2016-11-08 19:38 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-08 18:39 [PATCH v10 0/7] x86/arch_prctl Add ARCH_[GET|SET]_CPUID for controlling the CPUID instruction Kyle Huey
2016-11-08 18:39 ` [PATCH v10 1/7] x86/arch_prctl/64: Use SYSCALL_DEFINE2 to define sys_arch_prctl Kyle Huey
2016-11-09 9:47 ` Borislav Petkov
2016-11-10 18:17 ` Kyle Huey
2016-11-08 18:39 ` [PATCH v10 2/7] x86/arch_prctl/64: Rename do_arch_prctl to do_arch_prctl_64 Kyle Huey
2016-11-09 9:58 ` Borislav Petkov
2016-11-08 18:39 ` [PATCH v10 3/7] x86/arch_prctl: Add do_arch_prctl_common Kyle Huey
2016-11-09 10:31 ` Borislav Petkov
2016-11-08 18:39 ` [PATCH v10 4/7] x86/syscalls/32: Wire up arch_prctl on x86-32 Kyle Huey
2016-11-09 11:04 ` Borislav Petkov
2016-11-08 18:39 ` [PATCH v10 5/7] x86/cpufeature: Detect CPUID faulting support Kyle Huey
2016-11-08 19:06 ` Thomas Gleixner
2016-11-08 19:38 ` Kyle Huey [this message]
2016-11-09 11:14 ` Borislav Petkov
2016-11-08 18:39 ` [PATCH v10 6/7] x86/arch_prctl: Add ARCH_[GET|SET]_CPUID Kyle Huey
2016-11-08 20:06 ` Thomas Gleixner
2016-11-09 13:21 ` Borislav Petkov
2016-11-09 13:34 ` Thomas Gleixner
2016-11-10 23:38 ` Kyle Huey
2016-11-10 23:26 ` Kyle Huey
2016-11-09 13:12 ` Borislav Petkov
2017-03-14 19:01 ` H. Peter Anvin
2017-03-14 19:08 ` Kyle Huey
2017-03-14 20:06 ` H. Peter Anvin
2017-03-14 19:17 ` H. Peter Anvin
2017-03-14 19:23 ` Andy Lutomirski
2017-03-15 9:11 ` H. Peter Anvin
2016-11-08 18:39 ` [PATCH v10 7/7] KVM: x86: virtualize cpuid faulting Kyle Huey
2016-11-08 22:12 ` David Matlack
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