From: Ingo Molnar <mingo@kernel.org>
To: "Chang S. Bae" <chang.seok.bae@intel.com>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com
Subject: Re: [PATCH RFC v1 06/11] x86/fpu/mpx: Remove MPX xstate component support
Date: Thu, 27 Feb 2025 20:12:07 +0100 [thread overview]
Message-ID: <Z8C5B9PJUqkEDGH9@gmail.com> (raw)
In-Reply-To: <20250227184502.10288-7-chang.seok.bae@intel.com>
* Chang S. Bae <chang.seok.bae@intel.com> wrote:
> A new xstate component is set to occupy the position previously used by
> MPX in the non-compacted format, then creating a fundamental conflict
> between the two.
>
> Currently, xfeature_noncompact_order[] includes MPX, but the introduction
> of the new feature would cause a direct conflict there unless MPX is
> removed. Fortunately, MPX support has already been deprecated and
> effectively removed by commit:
>
> 45fc24e89b7c ("x86/mpx: remove MPX from arch/x86")
>
> Explicitly disable the deprecated feature to reserve a space for the new
> xstate.
>
> Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
> ---
> Several code references to this feature macro remain, primarily on the
> KVM side. While they are likely to become obsolete after this patch,
> their cleanup has been deferred at this review stage: This can be
> addressed in a follow-up patch or included as an optional part of APX
> enablement, I suppose.
So can this patch be moved further up in the series (without breaking
anything), to make it easier to review the impact of the APX changes?
Thanks,
Ingo
next prev parent reply other threads:[~2025-02-27 19:12 UTC|newest]
Thread overview: 112+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-27 18:44 [PATCH RFC v1 00/11] x86: Support Intel Advanced Performance Extensions Chang S. Bae
2025-02-27 18:44 ` [PATCH RFC v1 01/11] x86/fpu/xstate: Simplify print_xstate_features() Chang S. Bae
2025-02-27 18:51 ` Dave Hansen
2025-02-27 18:52 ` Ingo Molnar
2025-02-27 19:04 ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2025-02-27 18:44 ` [PATCH RFC v1 02/11] x86/fpu/xstate: Introduce xstate order table and accessor macro Chang S. Bae
2025-02-27 19:03 ` Dave Hansen
2025-02-27 19:34 ` Andrew Cooper
2025-02-27 19:42 ` Ingo Molnar
2025-03-20 23:46 ` Chang S. Bae
2025-02-27 19:05 ` Ingo Molnar
2025-02-27 19:32 ` Dave Hansen
2025-02-27 19:36 ` Ingo Molnar
2025-02-27 19:49 ` Andrew Cooper
2025-02-27 20:06 ` Ingo Molnar
2025-02-27 21:10 ` Andrew Cooper
2025-02-27 21:28 ` Ingo Molnar
2025-02-27 21:30 ` Ingo Molnar
2025-02-27 22:23 ` Andrew Cooper
2025-02-28 3:10 ` Chang S. Bae
2025-02-28 17:11 ` Ingo Molnar
2025-02-27 19:56 ` Dave Hansen
2025-02-27 20:02 ` Ingo Molnar
2025-02-27 20:19 ` Dave Hansen
2025-02-27 20:29 ` Ingo Molnar
2025-02-27 21:17 ` Dave Hansen
2025-02-27 21:37 ` Ingo Molnar
2025-02-27 23:54 ` Dave Hansen
2025-02-28 15:20 ` Sean Christopherson
2025-02-27 18:44 ` [PATCH RFC v1 03/11] x86/fpu/xstate: Remove xstate offset check Chang S. Bae
2025-02-27 18:44 ` [PATCH RFC v1 04/11] x86/fpu/xstate: Adjust XSAVE buffer size calculation Chang S. Bae
2025-02-27 18:44 ` [PATCH RFC v1 05/11] x86/fpu/xstate: Adjust xstate copying logic for user ABI Chang S. Bae
2025-02-27 18:44 ` [PATCH RFC v1 06/11] x86/fpu/mpx: Remove MPX xstate component support Chang S. Bae
2025-02-27 19:12 ` Ingo Molnar [this message]
2025-02-28 3:12 ` Chang S. Bae
2025-03-20 23:47 ` Chang S. Bae
2025-04-01 17:13 ` Chang S. Bae
2025-02-27 18:44 ` [PATCH RFC v1 07/11] x86/cpufeatures: Add X86_FEATURE_APX Chang S. Bae
2025-02-27 18:44 ` [PATCH RFC v1 08/11] x86/fpu/apx: Define APX state component Chang S. Bae
2025-02-27 18:44 ` [PATCH RFC v1 09/11] x86/fpu/apx: Disallow conflicting MPX presence Chang S. Bae
2025-02-27 23:16 ` Dave Hansen
2025-02-27 23:58 ` Chang S. Bae
2025-02-27 18:44 ` [PATCH RFC v1 10/11] x86/fpu/apx: Enable APX state support Chang S. Bae
2025-02-27 18:44 ` [PATCH RFC v1 11/11] selftests/x86/apx: Add APX test Chang S. Bae
2025-02-27 19:15 ` [PATCH RFC v1 00/11] x86: Support Intel Advanced Performance Extensions Ingo Molnar
2025-02-27 19:36 ` Dave Hansen
2025-02-28 3:10 ` Chang S. Bae
2025-03-20 23:42 ` [PATCH RFC v2 0/9] " Chang S. Bae
2025-03-20 23:42 ` [PATCH RFC v2 1/9] x86/fpu/xstate: Remove xstate offset check Chang S. Bae
2025-03-25 10:18 ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2025-04-14 7:34 ` [tip: x86/merge] " tip-bot2 for Chang S. Bae
2025-03-20 23:42 ` [PATCH RFC v2 2/9] x86/fpu/xstate: Introduce xfeature order table and accessor macro Chang S. Bae
2025-03-25 10:18 ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2025-04-14 7:34 ` [tip: x86/merge] " tip-bot2 for Chang S. Bae
2025-03-20 23:42 ` [PATCH RFC v2 3/9] x86/fpu/xstate: Adjust XSAVE buffer size calculation Chang S. Bae
2025-03-25 10:28 ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2025-04-14 7:34 ` [tip: x86/merge] " tip-bot2 for Chang S. Bae
2025-03-20 23:42 ` [PATCH RFC v2 4/9] x86/fpu/xstate: Adjust xstate copying logic for user ABI Chang S. Bae
2025-03-25 10:18 ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2025-03-25 10:28 ` tip-bot2 for Chang S. Bae
2025-04-14 7:34 ` [tip: x86/merge] " tip-bot2 for Chang S. Bae
2025-03-20 23:42 ` [PATCH RFC v2 5/9] x86/cpufeatures: Add X86_FEATURE_APX Chang S. Bae
2025-04-11 16:12 ` [PATCH RFC v2a " Chang S. Bae
2025-04-11 16:54 ` Sohil Mehta
2025-04-11 18:23 ` Chang S. Bae
2025-04-11 21:57 ` Sohil Mehta
2025-04-12 8:43 ` Ingo Molnar
2025-04-14 8:23 ` Ingo Molnar
2025-04-14 17:28 ` Sohil Mehta
2025-04-14 17:32 ` Dave Hansen
2025-04-14 17:45 ` Sohil Mehta
2025-04-14 18:02 ` Chang S. Bae
2025-04-14 18:12 ` Sohil Mehta
2025-04-14 18:31 ` Chang S. Bae
2025-04-16 2:16 ` [PATCH 00/10] x86/fpu: APX enablement and assorted FPU code improvements Chang S. Bae
2025-04-16 2:16 ` [PATCH 01/10] x86/cpufeatures: Add X86_FEATURE_APX Chang S. Bae
2025-04-16 8:17 ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2025-04-16 2:16 ` [PATCH 02/10] x86/fpu/apx: Define APX state component Chang S. Bae
2025-04-16 8:17 ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2025-04-16 2:16 ` [PATCH 03/10] x86/fpu/apx: Disallow conflicting MPX presence Chang S. Bae
2025-04-16 8:17 ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2025-04-16 2:16 ` [PATCH 04/10] x86/fpu/apx: Enable APX state support Chang S. Bae
2025-04-16 8:17 ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2025-04-16 2:16 ` [PATCH 05/10] selftests/x86/apx: Add APX test Chang S. Bae
2025-04-16 8:17 ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2025-04-16 2:16 ` [PATCH 06/10] x86/fpu: Log XSAVE disablement consistently Chang S. Bae
2025-04-16 8:17 ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2025-04-16 16:56 ` [PATCH 06/10] " Sohil Mehta
2025-04-16 17:03 ` Chang S. Bae
2025-04-16 18:04 ` Sohil Mehta
2025-04-16 2:16 ` [PATCH 07/10] x86/fpu: Refactor xfeature bitmask update code for sigframe XSAVE Chang S. Bae
2025-04-16 8:05 ` Ingo Molnar
2025-04-16 16:55 ` Chang S. Bae
2025-04-16 8:17 ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2025-04-16 2:16 ` [PATCH 08/10] x86/pkeys: Simplify PKRU update in signal frame Chang S. Bae
2025-04-16 8:17 ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2025-04-16 2:16 ` [PATCH 09/10] x86/fpu: Remove export of mxcsr_feature_mask Chang S. Bae
2025-04-16 8:17 ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2025-04-16 2:17 ` [PATCH 10/10] x86/fpu: Rename fpu_reset_fpregs() to fpu_reset_fpstate_regs() Chang S. Bae
2025-04-16 8:17 ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2025-04-16 8:07 ` [PATCH 00/10] x86/fpu: APX enablement and assorted FPU code improvements Ingo Molnar
2025-04-16 16:56 ` Chang S. Bae
2025-03-20 23:42 ` [PATCH RFC v2 6/9] x86/fpu/apx: Define APX state component Chang S. Bae
2025-04-11 22:54 ` Sohil Mehta
2025-03-20 23:42 ` [PATCH RFC v2 7/9] x86/fpu/apx: Disallow conflicting MPX presence Chang S. Bae
2025-04-14 17:09 ` Sohil Mehta
2025-04-14 17:25 ` Dave Hansen
2025-03-20 23:42 ` [PATCH RFC v2 8/9] x86/fpu/apx: Enable APX state support Chang S. Bae
2025-04-14 15:41 ` Sohil Mehta
2025-03-20 23:43 ` [PATCH RFC v2 9/9] selftests/x86/apx: Add APX test Chang S. Bae
2025-04-14 16:02 ` Sohil Mehta
2025-03-25 10:25 ` [PATCH RFC v2 0/9] x86: Support Intel Advanced Performance Extensions Ingo Molnar
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