From: Dave Hansen <dave.hansen@intel.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: acme@redhat.com, aik@amd.com, akpm@linux-foundation.org,
alexander.shishkin@linux.intel.com, ardb@kernel.org,
ast@kernel.org, bp@alien8.de, brijesh.singh@amd.com,
changbin.du@huawei.com, christophe.leroy@csgroup.eu,
corbet@lwn.net, daniel.sneddon@linux.intel.com,
dave.hansen@linux.intel.com, ebiggers@google.com,
geert+renesas@glider.be, houtao1@huawei.com, hpa@zytor.com,
jgg@ziepe.ca, jgross@suse.com, jpoimboe@kernel.org,
kai.huang@intel.com, kees@kernel.org,
kirill.shutemov@linux.intel.com, leitao@debian.org,
linux-doc@vger.kernel.org, linux-efi@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux@rasmusvillemoes.dk, luto@kernel.org, mcgrof@kernel.org,
mhiramat@kernel.org, michael.roth@amd.com, mingo@kernel.org,
mingo@redhat.com, namhyung@kernel.org, paulmck@kernel.org,
pawan.kumar.gupta@linux.intel.com, peterz@infradead.org,
rick.p.edgecombe@intel.com, rppt@kernel.org,
sandipan.das@amd.com, shijie@os.amperecomputing.com,
sohil.mehta@intel.com, tglx@linutronix.de, tj@kernel.org,
tony.luck@intel.com, vegard.nossum@oracle.com, x86@kernel.org,
xin3.li@intel.com, xiongwei.song@windriver.com,
ytcoode@gmail.com
Subject: Re: [PATCHv6 00/16] x86: Enable Linear Address Space Separation support
Date: Fri, 20 Jun 2025 15:46:11 -0700 [thread overview]
Message-ID: <daa73e1b-2d1e-4b0b-a7c6-1f909c9672ba@intel.com> (raw)
In-Reply-To: <1aa5fb31-ce23-4c9f-ba1b-d5dc93402209@citrix.com>
On 6/20/25 15:04, Andrew Cooper wrote:
>> Most of the cover letter here reads like an Intel whitepaper. That's not
>> the worst thing in the world, but I think it glosses over one very
>> important point:
>>
>> Had it been available, LASS alone would have mitigated Meltdown.
>>
>> Could we say this up front in a prominent place, please?
>
> I'm going to nitpick. :)
>
> Yes, LASS would have made Meltdown a far less major problem than it was,
> but I don't think that phrasing is fair. As I recall, LASS was
> literally invented as a "what would have been useful?" exercise in the
> wake of Meltdown.
While being concise, I was also trying to convey that LASS is pretty
powerful, rather than it being some uniquely genius move by the CPU
designers. It was absolutely conceived of in hindsight.
Do you feel like the changelog is sufficient as-is? Or do you think we
can beef the changelog up a bit? I just want to make sure folks reading
it have a clear understanding that it's not fixing purely theoretical
issues.
prev parent reply other threads:[~2025-06-20 22:46 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-20 13:53 [PATCHv6 00/16] x86: Enable Linear Address Space Separation support Kirill A. Shutemov
2025-06-20 13:53 ` [PATCHv6 01/16] x86/cpu: Enumerate the LASS feature bits Kirill A. Shutemov
2025-06-20 15:25 ` Dave Hansen
2025-06-20 15:36 ` Xin Li
2025-06-20 17:31 ` Kirill A. Shutemov
2025-06-20 23:46 ` Xin Li
2025-06-21 0:45 ` H. Peter Anvin
2025-06-21 0:50 ` H. Peter Anvin
2025-06-23 17:40 ` Xin Li
2025-06-24 2:04 ` H. Peter Anvin
2025-06-24 4:57 ` Xin Li
2025-06-24 5:11 ` Xin Li
2025-06-20 16:02 ` Randy Dunlap
2025-06-20 16:12 ` Xin Li
2025-06-20 16:16 ` Randy Dunlap
2025-06-20 16:35 ` Borislav Petkov
2025-06-20 17:33 ` Kirill A. Shutemov
2025-06-20 18:29 ` Borislav Petkov
2025-06-23 8:17 ` Kirill A. Shutemov
2025-06-23 10:21 ` Borislav Petkov
2025-06-23 13:42 ` Kirill A. Shutemov
2025-06-26 15:18 ` Borislav Petkov
2025-06-26 16:07 ` Borislav Petkov
2025-06-26 17:21 ` Dave Hansen
2025-06-27 10:25 ` Kirill A. Shutemov
2025-06-27 10:43 ` Borislav Petkov
2025-06-27 13:57 ` Dave Hansen
2025-06-20 18:14 ` Sohil Mehta
2025-06-20 18:24 ` Dave Hansen
2025-06-20 23:10 ` Sohil Mehta
2025-06-23 16:25 ` Luck, Tony
2025-06-23 16:42 ` Dave Hansen
2025-06-23 23:13 ` Luck, Tony
2025-06-23 23:36 ` H. Peter Anvin
2025-06-24 0:10 ` Luck, Tony
2025-06-24 2:03 ` H. Peter Anvin
2025-06-25 18:51 ` H. Peter Anvin
2025-06-20 13:53 ` [PATCHv6 02/16] x86/asm: Introduce inline memcpy and memset Kirill A. Shutemov
2025-06-20 13:53 ` [PATCHv6 03/16] x86/alternatives: Disable LASS when patching kernel alternatives Kirill A. Shutemov
2025-06-20 15:33 ` Dave Hansen
2025-06-20 17:18 ` Kirill A. Shutemov
2025-06-20 13:53 ` [PATCHv6 04/16] x86/efi: Move runtime service initialization to arch/x86 Kirill A. Shutemov
2025-06-20 15:35 ` Dave Hansen
2025-06-20 17:42 ` Kirill A. Shutemov
2025-06-20 13:53 ` [PATCHv6 05/16] x86/cpu: Defer CR pinning setup until after EFI initialization Kirill A. Shutemov
2025-06-20 15:44 ` Dave Hansen
2025-06-20 13:53 ` [PATCHv6 06/16] efi: Disable LASS around set_virtual_address_map() EFI call Kirill A. Shutemov
2025-06-20 15:55 ` Dave Hansen
2025-06-20 17:50 ` Kirill A. Shutemov
2025-06-20 13:53 ` [PATCHv6 07/16] x86/vsyscall: Reorganize the #PF emulation code Kirill A. Shutemov
2025-06-20 18:43 ` Dave Hansen
2025-06-20 23:08 ` Andrew Cooper
2025-06-20 23:18 ` Sohil Mehta
2025-06-20 23:29 ` Andrew Cooper
2025-06-20 23:21 ` Dave Hansen
2025-06-21 3:35 ` H. Peter Anvin
2025-06-23 12:41 ` Kirill A. Shutemov
2025-06-23 12:46 ` Andrew Cooper
2025-06-23 15:32 ` Dave Hansen
2025-06-23 15:45 ` Andrew Cooper
2025-06-24 11:37 ` Kirill A. Shutemov
2025-06-24 14:11 ` Dave Hansen
2025-06-24 14:59 ` [PATCH] x86/vsyscall: Do not require X86_PF_INSTR to emulate vsyscall Kirill A. Shutemov
2025-06-20 13:53 ` [PATCHv6 08/16] x86/traps: Consolidate user fixups in exc_general_protection() Kirill A. Shutemov
2025-06-20 14:47 ` Dave Hansen
2025-06-20 13:53 ` [PATCHv6 09/16] x86/vsyscall: Add vsyscall emulation for #GP Kirill A. Shutemov
2025-06-20 13:53 ` [PATCHv6 10/16] x86/vsyscall: Disable LASS if vsyscall mode is set to EMULATE Kirill A. Shutemov
2025-06-20 13:53 ` [PATCHv6 11/16] x86/cpu: Set LASS CR4 bit as pinning sensitive Kirill A. Shutemov
2025-06-20 13:53 ` [PATCHv6 12/16] x86/traps: Communicate a LASS violation in #GP message Kirill A. Shutemov
2025-06-20 13:53 ` [PATCHv6 13/16] x86/traps: Handle LASS thrown #SS Kirill A. Shutemov
2025-06-20 15:20 ` Xin Li
2025-06-20 17:53 ` Kirill A. Shutemov
2025-06-20 13:53 ` [PATCHv6 14/16] x86/cpu: Make LAM depend on LASS Kirill A. Shutemov
2025-06-20 13:53 ` [PATCHv6 15/16] x86/cpu: Enable LASS during CPU initialization Kirill A. Shutemov
2025-06-20 13:53 ` [PATCHv6 16/16] x86: Re-enable Linear Address Masking Kirill A. Shutemov
2025-06-20 15:38 ` [PATCHv6 00/16] x86: Enable Linear Address Space Separation support Dave Hansen
2025-06-20 22:04 ` Andrew Cooper
2025-06-20 22:29 ` H. Peter Anvin
2025-06-20 22:43 ` H. Peter Anvin
2025-06-20 22:46 ` Dave Hansen [this message]
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