From: Borislav Petkov <bp@alien8.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,
thiago.macieira@intel.com, jing2.liu@intel.com,
ravi.v.shankar@intel.com, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org
Subject: Re: [PATCH v9 07/26] x86/fpu/xstate: Convert the struct fpu 'state' field to a pointer
Date: Thu, 12 Aug 2021 19:09:28 +0200 [thread overview]
Message-ID: <YRVVyI2RDVzFplnn@zn.tnic> (raw)
In-Reply-To: <20210730145957.7927-8-chang.seok.bae@intel.com>
On Fri, Jul 30, 2021 at 07:59:38AM -0700, Chang S. Bae wrote:
> diff --git a/arch/x86/include/asm/fpu/types.h b/arch/x86/include/asm/fpu/types.h
> index f5a38a5f3ae1..c7826708f27f 100644
> --- a/arch/x86/include/asm/fpu/types.h
> +++ b/arch/x86/include/asm/fpu/types.h
> @@ -339,13 +339,30 @@ struct fpu {
> /*
> * @state:
> *
> - * In-memory copy of all FPU registers that we save/restore
> - * over context switches. If the task is using the FPU then
> - * the registers in the FPU are more recent than this state
> - * copy. If the task context-switches away then they get
> - * saved here and represent the FPU state.
> + * A pointer to indicate the in-memory copy of all FPU registers
> + * that are saved/restored over context switches.
> + *
> + * Initially @state points to @__default_state. When dynamic states
> + * get used, a memory is allocated for the larger state copy and
> + * @state is updated to point to it. Then, the state in ->state
> + * supersedes and invalidates the state in @__default_state.
> + *
> + * In general, if the task is using the FPU then the registers in
> + * the FPU are more recent than the state copy. If the task
> + * context-switches away then they get saved in ->state and
> + * represent the FPU state.
> + */
> + union fpregs_state *state;
> +
> + /*
> + * @__default_state:
> + *
> + * Initial in-memory copy of all FPU registers that saved/restored
> + * over context switches. When the task is switched to dynamic
> + * states, this copy is replaced with the new in-memory copy in
> + * ->state.
> */
> - union fpregs_state state;
> + union fpregs_state __default_state;
> /*
> * WARNING: 'state' is dynamically-sized. Do not put
^^^^^^
that needs to be __default_state as it is which is dynamically-sized.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2021-08-12 17:09 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-30 14:59 [PATCH v9 00/26] x86: Support Intel Advanced Matrix Extensions Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 01/26] x86/fpu/xstate: Modify the initialization helper to handle both static and dynamic buffers Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 02/26] x86/fpu/xstate: Modify state copy helpers " Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 03/26] x86/fpu/xstate: Modify address finders " Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 04/26] x86/fpu/xstate: Add a new variable to indicate dynamic user states Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 05/26] x86/fpu/xstate: Add new variables to indicate dynamic XSTATE buffer size Chang S. Bae
2021-08-12 15:03 ` Borislav Petkov
2021-07-30 14:59 ` [PATCH v9 06/26] x86/fpu/xstate: Calculate and remember dynamic XSTATE buffer sizes Chang S. Bae
2021-08-12 16:36 ` Borislav Petkov
2021-07-30 14:59 ` [PATCH v9 07/26] x86/fpu/xstate: Convert the struct fpu 'state' field to a pointer Chang S. Bae
2021-08-12 17:09 ` Borislav Petkov [this message]
2021-07-30 14:59 ` [PATCH v9 08/26] x86/fpu/xstate: Introduce helpers to manage the XSTATE buffer dynamically Chang S. Bae
2021-08-12 19:44 ` Borislav Petkov
2021-08-13 8:04 ` Bae, Chang Seok
2021-08-13 10:04 ` Borislav Petkov
2021-08-13 19:43 ` Bae, Chang Seok
2021-08-18 9:28 ` Borislav Petkov
2021-08-18 19:46 ` Bae, Chang Seok
2021-08-25 16:01 ` Bae, Chang Seok
2021-08-30 17:07 ` Borislav Petkov
2021-08-30 23:39 ` Bae, Chang Seok
2021-08-16 18:33 ` Bae, Chang Seok
2021-08-16 18:53 ` Borislav Petkov
2021-08-30 17:45 ` Dave Hansen
2021-08-30 23:39 ` Bae, Chang Seok
2021-07-30 14:59 ` [PATCH v9 09/26] x86/fpu/xstate: Update the XSTATE save function to support dynamic states Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 10/26] x86/fpu/xstate: Update the XSTATE buffer address finder " Chang S. Bae
2021-08-18 11:33 ` Borislav Petkov
2021-08-18 19:47 ` Bae, Chang Seok
2021-08-30 17:18 ` Borislav Petkov
2021-08-30 23:38 ` Bae, Chang Seok
2021-07-30 14:59 ` [PATCH v9 11/26] x86/fpu/xstate: Update the XSTATE context copy function " Chang S. Bae
2021-08-18 12:03 ` Borislav Petkov
2021-08-18 19:47 ` Bae, Chang Seok
2021-07-30 14:59 ` [PATCH v9 12/26] x86/fpu/xstate: Use feature disable (XFD) to protect dynamic user state Chang S. Bae
2021-08-18 16:24 ` Borislav Petkov
2021-08-18 17:20 ` Thiago Macieira
2021-08-18 17:46 ` Borislav Petkov
2021-08-18 17:58 ` Thiago Macieira
2021-08-18 18:10 ` Borislav Petkov
2021-08-24 22:51 ` Len Brown
2021-08-18 20:43 ` Bae, Chang Seok
2021-08-18 21:04 ` Thiago Macieira
2021-08-18 21:12 ` Bae, Chang Seok
2021-08-18 22:27 ` Thiago Macieira
2021-08-19 1:21 ` Andy Lutomirski
2021-08-19 16:06 ` Thiago Macieira
2021-08-18 21:17 ` Borislav Petkov
2021-08-18 21:37 ` Bae, Chang Seok
2021-08-19 8:00 ` Borislav Petkov
2021-08-19 15:24 ` Bae, Chang Seok
2021-08-24 23:22 ` Len Brown
2021-08-30 17:31 ` Borislav Petkov
2021-09-17 3:48 ` Len Brown
2021-08-18 19:47 ` Bae, Chang Seok
2021-08-24 22:21 ` Len Brown
2021-08-30 17:41 ` Borislav Petkov
2021-08-31 21:44 ` Len Brown
2021-08-24 23:17 ` Len Brown
2021-08-30 17:53 ` Borislav Petkov
2021-08-31 22:07 ` Len Brown
2021-08-31 22:11 ` Dave Hansen
2021-08-30 18:04 ` Dave Hansen
2021-08-31 22:15 ` Len Brown
2021-08-31 22:16 ` Len Brown
2021-08-31 22:39 ` Thiago Macieira
2021-08-31 22:44 ` Len Brown
2021-07-30 14:59 ` [PATCH v9 13/26] x86/fpu/xstate: Support ptracer-induced XSTATE buffer expansion Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 14/26] x86/arch_prctl: Create ARCH_SET_STATE_ENABLE/ARCH_GET_STATE_ENABLE Chang S. Bae
2021-08-06 16:46 ` Thiago Macieira
2021-08-09 22:08 ` Bae, Chang Seok
2021-08-09 23:42 ` Thiago Macieira
2021-08-10 0:57 ` Bae, Chang Seok
2021-08-13 19:44 ` Bae, Chang Seok
2021-07-30 14:59 ` [PATCH v9 15/26] x86/fpu/xstate: Support both legacy and expanded signal XSTATE size Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 16/26] x86/fpu/xstate: Adjust the XSAVE feature table to address gaps in state component numbers Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 17/26] x86/fpu/xstate: Disable XSTATE support if an inconsistent state is detected Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 18/26] x86/cpufeatures/amx: Enumerate Advanced Matrix Extension (AMX) feature bits Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 19/26] x86/fpu/amx: Define AMX state components and have it used for boot-time checks Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 20/26] x86/fpu/amx: Initialize child's AMX state Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 21/26] x86/fpu/amx: Enable the AMX feature in 64-bit mode Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 22/26] x86/fpu/xstate: Skip writing zeros to signal frame for dynamic user states if in INIT-state Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 23/26] selftest/x86/amx: Test cases for the AMX state management Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 24/26] x86/insn/amx: Add TILERELEASE instruction to the opcode map Chang S. Bae
2021-07-30 14:59 ` [PATCH v9 25/26] intel_idle/amx: Add SPR support with XTILEDATA capability Chang S. Bae
2021-07-30 18:41 ` Dave Hansen
2021-08-03 21:32 ` Bae, Chang Seok
2021-08-03 21:38 ` Dave Hansen
2021-08-03 21:43 ` Brown, Len
2021-07-30 20:15 ` Dave Hansen
2021-07-30 14:59 ` [PATCH v9 26/26] x86/fpu/xstate: Add a sanity check for XFD state when saving XSTATE Chang S. Bae
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