From: "Bae, Chang Seok" <chang.seok.bae@intel.com>
To: Randy Dunlap <rdunlap@infradead.org>
Cc: Borislav Petkov <bp@suse.de>, "luto@kernel.org" <luto@kernel.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"mingo@kernel.org" <mingo@kernel.org>,
"x86@kernel.org" <x86@kernel.org>,
"Brown, Len" <len.brown@intel.com>,
"Hansen, Dave" <dave.hansen@intel.com>,
"Liu, Jing2" <jing2.liu@intel.com>,
"Shankar, Ravi V" <ravi.v.shankar@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>
Subject: Re: [PATCH v3 21/21] x86/fpu/xstate: Introduce boot-parameters to control some state component support
Date: Thu, 14 Jan 2021 21:31:19 +0000 [thread overview]
Message-ID: <3AB31479-2394-4BFF-B309-F692E9135CE0@intel.com> (raw)
In-Reply-To: <64c67e40-ecba-5d9b-7c4b-4c64ea62906a@infradead.org>
> On Dec 23, 2020, at 10:37, Randy Dunlap <rdunlap@infradead.org> wrote:
>
> On 12/23/20 7:57 AM, Chang S. Bae wrote:
>> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
>> index 44fde25bb221..a67ae04d43c5 100644
>> --- a/Documentation/admin-guide/kernel-parameters.txt
>> +++ b/Documentation/admin-guide/kernel-parameters.txt
>> @@ -6002,6 +6002,21 @@
>> which allow the hypervisor to 'idle' the guest on lock
>> contention.
>>
>> + xstate.enable= [X86-64]
>> + xstate.disable= [X86-64]
>> + The kernel is compiled with a default xstate bitmask --
>> + enabling it to use the XSAVE hardware to efficiently
>> + save and restore thread states on context switch.
>> + xstate.enable allows adding to that default mask at
>> + boot-time without recompiling the kernel just to support
>> + the new thread state. (Note that the kernel will ignore
>> + any bits in the mask that do not correspond to features
>> + that are actually available in CPUID) xstate.disable
>
> CPUID.)
>
>> + allows clearing bits in the default mask, forcing the
>> + kernel to forget that it supports the specified thread
>> + state. When a bit set for both, the kernel takes
>> + xstate.disable in a priority.
>
> as a priority.
> ?
Thank you. I fixed those typos in my tree.
Chang
next prev parent reply other threads:[~2021-01-14 21:32 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-23 15:56 [PATCH v3 00/21] x86: Support Intel Advanced Matrix Extensions Chang S. Bae
2020-12-23 15:56 ` [PATCH v3 01/21] x86/fpu/xstate: Modify initialization helper to handle both static and dynamic buffers Chang S. Bae
2021-01-15 12:40 ` Borislav Petkov
2020-12-23 15:56 ` [PATCH v3 02/21] x86/fpu/xstate: Modify state copy helpers " Chang S. Bae
2021-01-15 12:50 ` Borislav Petkov
2021-01-19 18:50 ` Bae, Chang Seok
2021-01-20 20:53 ` Borislav Petkov
2021-01-20 21:12 ` Bae, Chang Seok
2020-12-23 15:56 ` [PATCH v3 03/21] x86/fpu/xstate: Modify address finders " Chang S. Bae
2021-01-15 13:06 ` Borislav Petkov
2020-12-23 15:57 ` [PATCH v3 04/21] x86/fpu/xstate: Modify context switch helpers " Chang S. Bae
2021-01-15 13:18 ` Borislav Petkov
2021-01-19 18:49 ` Bae, Chang Seok
2020-12-23 15:57 ` [PATCH v3 05/21] x86/fpu/xstate: Add a new variable to indicate dynamic user states Chang S. Bae
2021-01-15 13:39 ` Borislav Petkov
2021-01-15 19:47 ` Bae, Chang Seok
2021-01-19 15:57 ` Borislav Petkov
2021-01-19 18:57 ` Bae, Chang Seok
2021-01-22 10:56 ` Borislav Petkov
2021-01-27 1:23 ` Bae, Chang Seok
2020-12-23 15:57 ` [PATCH v3 06/21] x86/fpu/xstate: Calculate and remember dynamic xstate buffer sizes Chang S. Bae
2021-01-22 11:44 ` Borislav Petkov
2021-01-27 1:23 ` Bae, Chang Seok
2021-01-27 9:38 ` Borislav Petkov
2021-02-03 2:54 ` Bae, Chang Seok
2020-12-23 15:57 ` [PATCH v3 07/21] x86/fpu/xstate: Introduce helpers to manage dynamic xstate buffers Chang S. Bae
2021-01-26 20:17 ` Borislav Petkov
2021-01-27 1:23 ` Bae, Chang Seok
2021-01-27 10:41 ` Borislav Petkov
2021-02-03 4:10 ` Bae, Chang Seok
2021-02-04 13:10 ` Borislav Petkov
2021-02-03 4:10 ` Bae, Chang Seok
2020-12-23 15:57 ` [PATCH v3 08/21] x86/fpu/xstate: Define the scope of the initial xstate data Chang S. Bae
2021-02-08 12:33 ` Borislav Petkov
2021-02-08 18:53 ` Bae, Chang Seok
2021-02-09 12:49 ` Borislav Petkov
2021-02-09 15:38 ` Bae, Chang Seok
2020-12-23 15:57 ` [PATCH v3 09/21] x86/fpu/xstate: Introduce wrapper functions to organize xstate buffer access Chang S. Bae
2021-02-08 12:33 ` Borislav Petkov
2021-02-09 15:50 ` Bae, Chang Seok
2020-12-23 15:57 ` [PATCH v3 10/21] x86/fpu/xstate: Update xstate save function to support dynamic xstate Chang S. Bae
2021-01-07 8:41 ` Liu, Jing2
2021-01-07 18:40 ` Bae, Chang Seok
2021-01-12 2:52 ` Liu, Jing2
2021-01-15 4:59 ` Bae, Chang Seok
2021-01-15 5:45 ` Liu, Jing2
2021-02-08 12:33 ` Borislav Petkov
2021-02-09 15:48 ` Bae, Chang Seok
2020-12-23 15:57 ` [PATCH v3 11/21] x86/fpu/xstate: Update xstate buffer address finder " Chang S. Bae
2021-02-19 15:00 ` Borislav Petkov
2021-02-19 19:19 ` Bae, Chang Seok
2020-12-23 15:57 ` [PATCH v3 12/21] x86/fpu/xstate: Update xstate context copy function to support dynamic buffer Chang S. Bae
2020-12-23 15:57 ` [PATCH v3 13/21] x86/fpu/xstate: Expand dynamic context switch buffer on first use Chang S. Bae
2020-12-23 15:57 ` [PATCH v3 14/21] x86/fpu/xstate: Support ptracer-induced xstate buffer expansion Chang S. Bae
2020-12-23 15:57 ` [PATCH v3 15/21] x86/fpu/xstate: Extend the table to map xstate components with features Chang S. Bae
2020-12-23 15:57 ` [PATCH v3 16/21] x86/cpufeatures/amx: Enumerate Advanced Matrix Extension (AMX) feature bits Chang S. Bae
2020-12-23 15:57 ` [PATCH v3 17/21] x86/fpu/amx: Define AMX state components and have it used for boot-time checks Chang S. Bae
2020-12-23 15:57 ` [PATCH v3 18/21] x86/fpu/amx: Enable the AMX feature in 64-bit mode Chang S. Bae
2020-12-23 15:57 ` [PATCH v3 19/21] selftest/x86/amx: Include test cases for the AMX state management Chang S. Bae
2020-12-23 15:57 ` [PATCH v3 20/21] x86/fpu/xstate: Support dynamic user state in the signal handling path Chang S. Bae
2020-12-23 15:57 ` [PATCH v3 21/21] x86/fpu/xstate: Introduce boot-parameters to control some state component support Chang S. Bae
2020-12-23 18:37 ` Randy Dunlap
2021-01-14 21:31 ` Bae, Chang Seok [this message]
2021-01-14 21:31 ` [PATCH v3 00/21] x86: Support Intel Advanced Matrix Extensions Bae, Chang Seok
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