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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, kvm@vger.kernel.org
Subject: Re: [PATCH v3 10/21] x86/fpu/xstate: Update xstate save function to support dynamic xstate
Date: Mon, 8 Feb 2021 13:33:59 +0100	[thread overview]
Message-ID: <20210208123359.GG17908@zn.tnic> (raw)
In-Reply-To: <20201223155717.19556-11-chang.seok.bae@intel.com>

On Wed, Dec 23, 2020 at 07:57:06AM -0800, Chang S. Bae wrote:
> copy_xregs_to_kernel() used to save all user states in a kernel buffer.
> When the dynamic user state is enabled, it becomes conditional which state
> to be saved.
> 
> fpu->state_mask can indicate which state components are reserved to be
> saved in XSAVE buffer. Use it as XSAVE's instruction mask to select states.
> 
> KVM used to save all xstate via copy_xregs_to_kernel(). Update KVM to set a
> valid fpu->state_mask, which will be necessary to correctly handle dynamic
> state buffers.

All this commit message should say is something along the lines of
"extend copy_xregs_to_kernel() to receive a mask argument of which
states to save, in preparation of dynamic states handling."

> No functional change until the kernel supports dynamic user states.

Same comment as before.

-- 
Regards/Gruss,
    Boris.

SUSE Software Solutions Germany GmbH, GF: Felix Imendörffer, HRB 36809, AG Nürnberg

  parent reply	other threads:[~2021-02-08 12:40 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
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 [this message]
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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