From: Sohil Mehta <sohil.mehta@intel.com>
To: Borislav Petkov <bp@alien8.de>
Cc: <x86@kernel.org>, Dave Hansen <dave.hansen@linux.intel.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
"Jonathan Corbet" <corbet@lwn.net>,
"H . Peter Anvin" <hpa@zytor.com>,
Andy Lutomirski <luto@kernel.org>,
Josh Poimboeuf <jpoimboe@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ard Biesheuvel <ardb@kernel.org>,
"Kirill A . Shutemov" <kas@kernel.org>, Xin Li <xin@zytor.com>,
David Woodhouse <dwmw@amazon.co.uk>,
Sean Christopherson <seanjc@google.com>,
Rick Edgecombe <rick.p.edgecombe@intel.com>,
Vegard Nossum <vegard.nossum@oracle.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
David Laight <david.laight.linux@gmail.com>,
Randy Dunlap <rdunlap@infradead.org>,
"Geert Uytterhoeven" <geert@linux-m68k.org>,
Kees Cook <kees@kernel.org>, Tony Luck <tony.luck@intel.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
<linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-efi@vger.kernel.org>
Subject: Re: [PATCH v10 02/15] x86/asm: Introduce inline memcpy and memset
Date: Tue, 21 Oct 2025 11:06:03 -0700 [thread overview]
Message-ID: <714268c1-b78e-4096-a40b-b9c3861d4446@intel.com> (raw)
In-Reply-To: <20251021124751.GLaPeA9z8BCIe8AudC@fat_crate.local>
On 10/21/2025 5:47 AM, Borislav Petkov wrote:
> On Mon, Oct 06, 2025 at 11:51:06PM -0700, Sohil Mehta wrote:
>> From: "Peter Zijlstra (Intel)" <peterz@infradead.org>
>>
>> Provide inline memcpy and memset functions that can be used instead of
>> the GCC builtins when necessary. The immediate use case is for the text
>> poking functions to avoid the standard memcpy()/memset() calls within an
>> RFLAGS.AC=1 context.
>
> ... because objtool does not allow function calls with AC=1 because... see
> objtool/Documentation/objtool.txt, warning type 9, yadda yadda...
>
Sure, will add some notes here as well as in the next patch where it is
used.
next prev parent reply other threads:[~2025-10-21 18:06 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-07 6:51 [PATCH v10 00/15] x86: Enable Linear Address Space Separation support Sohil Mehta
2025-10-07 6:51 ` [PATCH v10 01/15] x86/cpu: Enumerate the LASS feature bits Sohil Mehta
2025-10-07 18:19 ` Edgecombe, Rick P
2025-10-07 18:28 ` Dave Hansen
2025-10-07 20:20 ` Sohil Mehta
2025-10-07 20:38 ` Edgecombe, Rick P
2025-10-07 20:53 ` Sohil Mehta
2025-10-16 3:10 ` H. Peter Anvin
2025-10-07 20:49 ` Sohil Mehta
2025-10-07 23:16 ` Xin Li
2025-10-08 16:00 ` Edgecombe, Rick P
2025-10-16 15:35 ` Borislav Petkov
2025-10-21 18:03 ` Sohil Mehta
2025-10-07 6:51 ` [PATCH v10 02/15] x86/asm: Introduce inline memcpy and memset Sohil Mehta
2025-10-21 12:47 ` Borislav Petkov
2025-10-21 13:48 ` David Laight
2025-10-21 18:06 ` Sohil Mehta [this message]
2025-10-07 6:51 ` [PATCH v10 03/15] x86/alternatives: Disable LASS when patching kernel alternatives Sohil Mehta
2025-10-07 16:55 ` Edgecombe, Rick P
2025-10-07 22:28 ` Sohil Mehta
2025-10-08 16:22 ` Edgecombe, Rick P
2025-10-10 17:10 ` Sohil Mehta
2025-10-21 20:03 ` Borislav Petkov
2025-10-21 20:55 ` Sohil Mehta
2025-10-22 9:56 ` Borislav Petkov
2025-10-22 19:49 ` Sohil Mehta
2025-10-22 20:03 ` Luck, Tony
2025-10-22 8:25 ` Peter Zijlstra
2025-10-22 9:40 ` Borislav Petkov
2025-10-22 10:22 ` Peter Zijlstra
2025-10-22 10:52 ` Borislav Petkov
2025-10-07 6:51 ` [PATCH v10 04/15] x86/cpu: Set LASS CR4 bit as pinning sensitive Sohil Mehta
2025-10-07 18:24 ` Edgecombe, Rick P
2025-10-07 23:11 ` Sohil Mehta
2025-10-08 16:52 ` Edgecombe, Rick P
2025-10-10 19:03 ` Sohil Mehta
2025-10-07 6:51 ` [PATCH v10 05/15] x86/cpu: Defer CR pinning enforcement until late_initcall() Sohil Mehta
2025-10-07 17:23 ` Edgecombe, Rick P
2025-10-07 23:05 ` Sohil Mehta
2025-10-08 17:36 ` Edgecombe, Rick P
2025-10-10 20:45 ` Sohil Mehta
2025-10-15 21:17 ` Sohil Mehta
2025-10-17 19:28 ` Sohil Mehta
2025-10-07 6:51 ` [PATCH v10 06/15] x86/efi: Disable LASS while mapping the EFI runtime services Sohil Mehta
2025-10-07 6:51 ` [PATCH v10 07/15] x86/kexec: Disable LASS during relocate kernel Sohil Mehta
2025-10-07 17:43 ` Edgecombe, Rick P
2025-10-07 22:33 ` Sohil Mehta
2025-10-07 6:51 ` [PATCH v10 08/15] x86/vsyscall: Reorganize the page fault emulation code Sohil Mehta
2025-10-07 18:37 ` Edgecombe, Rick P
2025-10-07 18:48 ` Dave Hansen
2025-10-07 19:53 ` Edgecombe, Rick P
2025-10-07 22:52 ` Sohil Mehta
2025-10-08 17:42 ` Edgecombe, Rick P
2025-10-30 16:58 ` Andy Lutomirski
2025-10-30 17:22 ` H. Peter Anvin
2025-10-30 17:35 ` Andy Lutomirski
2025-10-30 19:28 ` Sohil Mehta
2025-10-30 21:37 ` David Laight
2025-10-07 6:51 ` [PATCH v10 09/15] x86/traps: Consolidate user fixups in exc_general_protection() Sohil Mehta
2025-10-07 17:46 ` Edgecombe, Rick P
2025-10-07 22:41 ` Sohil Mehta
2025-10-08 17:43 ` Edgecombe, Rick P
2025-10-07 6:51 ` [PATCH v10 10/15] x86/vsyscall: Add vsyscall emulation for #GP Sohil Mehta
2025-10-07 6:51 ` [PATCH v10 11/15] x86/vsyscall: Disable LASS if vsyscall mode is set to EMULATE Sohil Mehta
2025-10-07 18:43 ` Edgecombe, Rick P
2025-10-07 6:51 ` [PATCH v10 12/15] x86/traps: Communicate a LASS violation in #GP message Sohil Mehta
2025-10-07 18:07 ` Edgecombe, Rick P
2025-10-07 6:51 ` [PATCH v10 13/15] x86/traps: Generalize #GP address decode and hint code Sohil Mehta
2025-10-07 18:43 ` Edgecombe, Rick P
2025-10-07 6:51 ` [PATCH v10 14/15] x86/traps: Provide additional hints for a kernel stack segment fault Sohil Mehta
2025-10-07 6:51 ` [PATCH v10 15/15] x86/cpu: Enable LASS by default during CPU initialization Sohil Mehta
2025-10-07 18:42 ` Edgecombe, Rick P
2025-10-07 16:23 ` [PATCH v10 00/15] x86: Enable Linear Address Space Separation support Edgecombe, Rick P
2025-10-17 19:52 ` Sohil Mehta
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