From: David Laight <david.laight.linux@gmail.com>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Xin Li <xin@zytor.com>, Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <peterz@infradead.org>,
Ard Biesheuvel <ardb@kernel.org>,
"Paul E. McKenney" <paulmck@kernel.org>,
Josh Poimboeuf <jpoimboe@kernel.org>,
Xiongwei Song <xiongwei.song@windriver.com>,
Xin Li <xin3.li@intel.com>,
"Mike Rapoport (IBM)" <rppt@kernel.org>,
Brijesh Singh <brijesh.singh@amd.com>,
Michael Roth <michael.roth@amd.com>,
Tony Luck <tony.luck@intel.com>,
Alexey Kardashevskiy <aik@amd.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jonathan Corbet <corbet@lwn.net>,
Sohil Mehta <sohil.mehta@intel.com>,
Ingo Molnar <mingo@kernel.org>,
Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
Daniel Sneddon <daniel.sneddon@linux.intel.com>,
Kai Huang <kai.huang@intel.com>,
Sandipan Das <sandipan.das@amd.com>,
Breno Leitao <leitao@debian.org>,
Rick Edgecombe <rick.p.edgecombe@intel.com>,
Alexei Starovoitov <ast@kernel.org>, Hou Tao <houtao1@huawei.com>,
Juergen Gross <jgross@suse.com>,
Vegard Nossum <vegard.nossum@oracle.com>,
Kees Cook <kees@kernel.org>, Eric Biggers <ebiggers@google.com>,
Jason Gunthorpe <jgg@ziepe.ca>,
"Masami Hiramatsu (Google)" <mhiramat@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Luis Chamberlain <mcgrof@kernel.org>,
Yuntao Wang <ytcoode@gmail.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
Tejun Heo <tj@kernel.org>, Changbin Du <changbin.du@huawei.com>,
Huang Shijie <shijie@os.amperecomputing.com>,
Geert Uytterhoeven <geert+renesas@glider.be>,
Namhyung Kim <namhyung@kernel.org>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-efi@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCHv7 13/16] x86/traps: Handle LASS thrown #SS
Date: Mon, 30 Jun 2025 09:30:27 +0100 [thread overview]
Message-ID: <20250630093027.38cd1ebc@pumpkin> (raw)
In-Reply-To: <lvutnc4et6r4a5eayoweb5butpspvop2m2pjioiudjwa3mkpo7@drcsdchj66w5>
On Fri, 27 Jun 2025 13:31:44 +0300
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> wrote:
> On Thu, Jun 26, 2025 at 10:57:47AM -0700, Xin Li wrote:
> > On 6/25/2025 5:51 AM, Kirill A. Shutemov wrote:
> > > LASS throws a #GP for any violations except for stack register accesses,
> > > in which case it throws a #SS instead. Handle this similarly to how other
> > > LASS violations are handled.
> > >
> > > In case of FRED, before handling #SS as LASS violation, kernel has to
> > > check if there's a fixup for the exception. It can address #SS due to
> > > invalid user context on ERETU[1]. See 5105e7687ad3 ("x86/fred: Fixup
> >
> > Forgot to put the link to [1]? Maybe just remove "[1]"?
>
> I will add the link. It is important context.
Will the link still be valid in 5 years time when someone
is looking back at the changes?
David
next prev parent reply other threads:[~2025-06-30 8:30 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-25 12:50 [PATCHv7 00/16] x86: Enable Linear Address Space Separation support Kirill A. Shutemov
2025-06-25 12:50 ` [PATCHv7 01/16] x86/cpu: Enumerate the LASS feature bits Kirill A. Shutemov
2025-06-26 15:22 ` Borislav Petkov
2025-06-26 18:00 ` Xin Li
2025-06-25 12:50 ` [PATCH] x86/vsyscall: Do not require X86_PF_INSTR to emulate vsyscall Kirill A. Shutemov
2025-06-25 12:55 ` Kirill A. Shutemov
2025-06-25 12:50 ` [PATCHv7 02/16] x86/asm: Introduce inline memcpy and memset Kirill A. Shutemov
2025-06-25 12:50 ` [PATCHv7 03/16] x86/alternatives: Disable LASS when patching kernel alternatives Kirill A. Shutemov
2025-06-26 13:49 ` Peter Zijlstra
2025-06-26 14:18 ` Dave Hansen
2025-06-27 10:27 ` Kirill A. Shutemov
2025-06-25 12:50 ` [PATCHv7 04/16] x86/cpu: Defer CR pinning setup until after EFI initialization Kirill A. Shutemov
2025-06-25 12:50 ` [PATCHv7 05/16] efi: Disable LASS around set_virtual_address_map() EFI call Kirill A. Shutemov
2025-06-25 12:50 ` [PATCHv7 06/16] x86/vsyscall: Do not require X86_PF_INSTR to emulate vsyscall Kirill A. Shutemov
2025-06-25 12:51 ` [PATCHv7 07/16] x86/vsyscall: Reorganize the #PF emulation code Kirill A. Shutemov
2025-06-25 12:51 ` [PATCHv7 08/16] x86/traps: Consolidate user fixups in exc_general_protection() Kirill A. Shutemov
2025-06-25 12:51 ` [PATCHv7 09/16] x86/vsyscall: Add vsyscall emulation for #GP Kirill A. Shutemov
2025-06-25 12:51 ` [PATCHv7 10/16] x86/vsyscall: Disable LASS if vsyscall mode is set to EMULATE Kirill A. Shutemov
2025-06-25 12:51 ` [PATCHv7 11/16] x86/cpu: Set LASS CR4 bit as pinning sensitive Kirill A. Shutemov
2025-06-25 12:51 ` [PATCHv7 12/16] x86/traps: Communicate a LASS violation in #GP message Kirill A. Shutemov
2025-06-25 12:51 ` [PATCHv7 13/16] x86/traps: Handle LASS thrown #SS Kirill A. Shutemov
2025-06-26 17:57 ` Xin Li
2025-06-27 10:31 ` Kirill A. Shutemov
2025-06-30 8:30 ` David Laight [this message]
2025-06-30 9:50 ` Kirill A. Shutemov
2025-06-25 12:51 ` [PATCHv7 14/16] x86/cpu: Make LAM depend on LASS Kirill A. Shutemov
2025-06-25 12:51 ` [PATCHv7 15/16] x86/cpu: Enable LASS during CPU initialization Kirill A. Shutemov
2025-06-25 12:51 ` [PATCHv7 16/16] x86: Re-enable Linear Address Masking Kirill A. Shutemov
2025-06-26 9:22 ` [PATCHv7 00/16] x86: Enable Linear Address Space Separation support Vegard Nossum
2025-06-26 9:35 ` Vegard Nossum
2025-06-26 12:47 ` Kirill A. Shutemov
2025-06-26 13:15 ` Vegard Nossum
2025-06-29 11:40 ` David Laight
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20250630093027.38cd1ebc@pumpkin \
--to=david.laight.linux@gmail.com \
--cc=acme@redhat.com \
--cc=aik@amd.com \
--cc=akpm@linux-foundation.org \
--cc=alexander.shishkin@linux.intel.com \
--cc=ardb@kernel.org \
--cc=ast@kernel.org \
--cc=bp@alien8.de \
--cc=brijesh.singh@amd.com \
--cc=changbin.du@huawei.com \
--cc=christophe.leroy@csgroup.eu \
--cc=corbet@lwn.net \
--cc=daniel.sneddon@linux.intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=ebiggers@google.com \
--cc=geert+renesas@glider.be \
--cc=houtao1@huawei.com \
--cc=hpa@zytor.com \
--cc=jgg@ziepe.ca \
--cc=jgross@suse.com \
--cc=jpoimboe@kernel.org \
--cc=kai.huang@intel.com \
--cc=kees@kernel.org \
--cc=kirill.shutemov@linux.intel.com \
--cc=leitao@debian.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-efi@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux@rasmusvillemoes.dk \
--cc=luto@kernel.org \
--cc=mcgrof@kernel.org \
--cc=mhiramat@kernel.org \
--cc=michael.roth@amd.com \
--cc=mingo@kernel.org \
--cc=mingo@redhat.com \
--cc=namhyung@kernel.org \
--cc=paulmck@kernel.org \
--cc=pawan.kumar.gupta@linux.intel.com \
--cc=peterz@infradead.org \
--cc=rick.p.edgecombe@intel.com \
--cc=rppt@kernel.org \
--cc=sandipan.das@amd.com \
--cc=shijie@os.amperecomputing.com \
--cc=sohil.mehta@intel.com \
--cc=tglx@linutronix.de \
--cc=tj@kernel.org \
--cc=tony.luck@intel.com \
--cc=vegard.nossum@oracle.com \
--cc=x86@kernel.org \
--cc=xin3.li@intel.com \
--cc=xin@zytor.com \
--cc=xiongwei.song@windriver.com \
--cc=ytcoode@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.