From: Fenghua Yu <fenghua.yu@intel.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, H Peter Anvin <hpa@zytor.com>,
Ashok Raj <ashok.raj@intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Michael Chan <michael.chan@broadcom.com>,
Ravi V Shankar <ravi.v.shankar@intel.com>,
Ricardo Neri <ricardo.neri@intel.com>,
linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>
Subject: Re: [PATCH v3 09/10] x86/split_lock: Define #AC for split lock feature
Date: Mon, 4 Feb 2019 10:45:49 -0800 [thread overview]
Message-ID: <20190204184549.GA69755@romley-ivt3.sc.intel.com> (raw)
In-Reply-To: <2d1c4c93-6ea9-5a0d-9a36-641fc01b14f5@intel.com>
On Mon, Feb 04, 2019 at 10:41:40AM -0800, Dave Hansen wrote:
> On 2/1/19 9:14 PM, Fenghua Yu wrote:
> > --- a/arch/x86/include/asm/cpufeatures.h
> > +++ b/arch/x86/include/asm/cpufeatures.h
> > @@ -221,6 +221,7 @@
> > #define X86_FEATURE_ZEN ( 7*32+28) /* "" CPU is AMD family 0x17 (Zen) */
> > #define X86_FEATURE_L1TF_PTEINV ( 7*32+29) /* "" L1TF workaround PTE inversion */
> > #define X86_FEATURE_IBRS_ENHANCED ( 7*32+30) /* Enhanced IBRS */
> > +#define X86_FEATURE_AC_SPLIT_LOCK ( 7*32+31) /* #AC for split lock */
>
> The last time this was posted, we (Intel) promised to go get the proper
> (CPUID or MSR-based) enumeration of this feature documented. Did we do
> that? If so, where is that documentation?
As said in the cover patch:
"Please note: The feature could be enumerated through
MSR IA32_CORE_CAPABILITY (0xCF). But the enumeration is not completely
published yet. So this patch set doesn't include the method."
In SDM and ISE, bit 5 in IA32_CORE_CAPABILITY is for enumeration for
the split lock feature. But how to enumerate IA32_CORE_CAPABILITY MSR
itself is not public yet.
That's why I didn't include the enumeration patches for IA32_CORE_CAPABILITY
and the split lock feature. The enumeration patches will be published
once the complete enumerations for both IA32_CORE_CAPABILITY and the split
lock feature is publicly released.
This patch set only uses "setcpuid=ac_split_lock" to enable the feature.
Thanks.
-Fenghua
next prev parent reply other threads:[~2019-02-04 18:52 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-02 5:14 [PATCH v3 00/10] x86/split_lock: Enable #AC exception for split locked accesses Fenghua Yu
2019-02-02 5:14 ` [PATCH v3 01/10] x86/common: Align cpu_caps_cleared and cpu_caps_set to unsigned long Fenghua Yu
2019-02-02 5:14 ` [PATCH v3 02/10] drivers/net/b44: Align pwol_mask to unsigned long for better performance Fenghua Yu
2019-02-02 5:14 ` [PATCH v3 03/10] wlcore: Align reg_ch_conf_pending and tmp_ch_bitmap " Fenghua Yu
2019-02-02 5:14 ` [PATCH v3 04/10] x86/split_lock: Align x86_capability to unsigned long to avoid split locked access Fenghua Yu
2019-02-02 5:14 ` [PATCH v3 05/10] x86/clearcpuid: Support multiple clearcpuid options Fenghua Yu
2019-02-02 5:14 ` [PATCH v3 06/10] x86/clearcpuid: Support feature flag string in kernel option clearcpuid Fenghua Yu
2019-02-02 5:14 ` [PATCH v3 07/10] Change document for " Fenghua Yu
2019-02-02 5:14 ` [PATCH v3 08/10] x86/setcpuid: Add kernel option setcpuid Fenghua Yu
2019-02-04 17:49 ` Thomas Gleixner
2019-02-04 19:05 ` Dave Hansen
2019-02-04 19:57 ` Borislav Petkov
2019-02-04 20:46 ` Dave Hansen
2019-02-04 21:40 ` Borislav Petkov
2019-02-04 22:14 ` Fenghua Yu
2019-02-05 6:10 ` Borislav Petkov
2019-02-04 23:24 ` Dave Hansen
2019-02-05 6:18 ` Borislav Petkov
2019-02-05 16:46 ` Dave Hansen
2019-02-05 17:09 ` Peter Zijlstra
2019-02-05 8:57 ` Peter Zijlstra
2019-02-05 13:15 ` Peter Zijlstra
2019-02-05 8:48 ` Peter Zijlstra
2019-02-05 15:19 ` Dave Hansen
2019-02-05 15:43 ` Borislav Petkov
2019-02-05 18:26 ` Fenghua Yu
2019-02-05 17:04 ` Peter Zijlstra
2019-02-10 19:20 ` Thomas Gleixner
2019-02-11 19:16 ` Fenghua Yu
2019-02-12 13:37 ` Peter Zijlstra
2019-02-12 13:51 ` Thomas Gleixner
2019-02-12 16:48 ` Peter Zijlstra
2019-02-12 16:50 ` Dave Hansen
2019-02-12 17:52 ` Yu, Fenghua
2019-02-04 21:09 ` Fenghua Yu
2019-02-05 8:51 ` Peter Zijlstra
2019-02-05 15:21 ` Dave Hansen
2019-02-05 15:34 ` Peter Zijlstra
2019-02-02 5:14 ` [PATCH v3 09/10] x86/split_lock: Define #AC for split lock feature Fenghua Yu
2019-02-04 18:41 ` Dave Hansen
2019-02-04 18:45 ` Fenghua Yu [this message]
2019-02-04 19:00 ` Dave Hansen
2019-02-04 19:03 ` Fenghua Yu
2019-02-02 5:14 ` [PATCH v3 10/10] x86/split_lock: Handle #AC exception for split lock Fenghua Yu
2019-02-04 11:00 ` kbuild test robot
2019-02-04 14:43 ` kbuild test robot
2019-02-11 10:53 ` Ingo Molnar
2019-02-11 18:10 ` Fenghua Yu
2019-02-13 8:14 ` Ingo Molnar
2019-02-13 14:37 ` Yu, Fenghua
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