From: Borislav Petkov <bp@suse.de>
To: "Chang S. Bae" <chang.seok.bae@intel.com>
Cc: luto@kernel.org, tglx@linutronix.de, mingo@kernel.org,
x86@kernel.org, len.brown@intel.com, dave.hansen@intel.com,
jing2.liu@intel.com, ravi.v.shankar@intel.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 05/21] x86/fpu/xstate: Add a new variable to indicate dynamic user states
Date: Fri, 15 Jan 2021 14:39:24 +0100 [thread overview]
Message-ID: <20210115133924.GE11337@zn.tnic> (raw)
In-Reply-To: <20201223155717.19556-6-chang.seok.bae@intel.com>
On Wed, Dec 23, 2020 at 07:57:01AM -0800, Chang S. Bae wrote:
> The perf has a buffer that is allocated on demand. The states saved in the
What's "the perf"? I hope to find out when I countinue reading...
> buffer were named as 'dynamic' (supervisor) states but the buffer is not
> updated in every context switch.
>
> The context switch buffer is in preparation to be dynamic for user states.
> Make the wording to differentiate between those 'dynamic' states.
>
> Add a new variable -- xfeatures_mask_user_dynamic to indicate the dynamic
> user states, and rename some define and helper as related to the dynamic
> supervisor states:
> xfeatures_mask_supervisor_dynamic()
> XFEATURE_MASK_SUPERVISOR_DYNAMIC
>
> No functional change.
Text needs cleaning up.
> Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
> Reviewed-by: Len Brown <len.brown@intel.com>
> Cc: x86@kernel.org
> Cc: linux-kernel@vger.kernel.org
> ---
> Changes from v2:
> * Updated the changelog for clarification.
> ---
> arch/x86/include/asm/fpu/xstate.h | 12 +++++++-----
> arch/x86/kernel/fpu/xstate.c | 29 +++++++++++++++++++----------
> 2 files changed, 26 insertions(+), 15 deletions(-)
>
> diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
> index 24bf8d3f559a..6ce8350672c2 100644
> --- a/arch/x86/include/asm/fpu/xstate.h
> +++ b/arch/x86/include/asm/fpu/xstate.h
> @@ -56,7 +56,7 @@
> * - Don't set the bit corresponding to the dynamic supervisor feature in
> * IA32_XSS at run time, since it has been set at boot time.
> */
> -#define XFEATURE_MASK_DYNAMIC (XFEATURE_MASK_LBR)
> +#define XFEATURE_MASK_SUPERVISOR_DYNAMIC (XFEATURE_MASK_LBR)
Is XFEATURE_MASK_USER_DYNAMIC coming too?
--
Regards/Gruss,
Boris.
SUSE Software Solutions Germany GmbH, GF: Felix Imendörffer, HRB 36809, AG Nürnberg
next prev parent reply other threads:[~2021-01-15 13:40 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 [this message]
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
2021-01-14 21:31 ` [PATCH v3 00/21] x86: Support Intel Advanced Matrix Extensions Bae, Chang Seok
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