From: "H. Peter Anvin" <hpa@zytor.com>
To: "Luck, Tony" <tony.luck@intel.com>,
"Hansen, Dave" <dave.hansen@intel.com>,
"Mehta, Sohil" <sohil.mehta@intel.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
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"x86@kernel.org" <x86@kernel.org>,
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>,
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"Mike Rapoport (IBM)" <rppt@kernel.org>,
Brijesh Singh <brijesh.singh@amd.com>,
Michael Roth <michael.roth@amd.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
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Cc: Jonathan Corbet <corbet@lwn.net>, Ingo Molnar <mingo@kernel.org>,
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"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
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"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>
Subject: Re: [PATCH v5 05/16] x86/cpu: Defer CR pinning setup until after EFI initialization
Date: Tue, 29 Oct 2024 16:02:24 -0700 [thread overview]
Message-ID: <ae1ce014-cf09-4e92-8d93-282042975aee@zytor.com> (raw)
In-Reply-To: <SJ1PR11MB6083CA923D92CD70AE6C5FB9FC4B2@SJ1PR11MB6083.namprd11.prod.outlook.com>
On 10/29/24 15:59, Luck, Tony wrote:
>> *IF* we switched things to do text poking in the upper half of the
>> address space, we'd probably want to find a completely unused PGD entry.
>> I'm not sure off the top of my head if we have a good one for that or
>> if it's worth the trouble.
>
> I expect that would be easy on 64-bit (no way the kernel needs all the
> PGD entries from 256..511) but hard for 32-bit (where kernel address
> space is in critically short supply on any machine with >1GB RAM).
No LASS on 32 bits...
-hpa
next prev parent reply other threads:[~2024-10-29 23:03 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-28 16:07 [PATCH v5 00/16] Enable Linear Address Space Separation support Alexander Shishkin
2024-10-28 16:07 ` [PATCH v5 01/16] x86/cpu: Enumerate the LASS feature bits Alexander Shishkin
2024-10-29 14:55 ` Kirill A. Shutemov
2024-10-29 21:46 ` Sohil Mehta
2024-10-28 16:07 ` [PATCH v5 02/16] x86/asm: Introduce inline memcpy and memset Alexander Shishkin
2024-10-28 16:07 ` [PATCH v5 03/16] x86/alternatives: Disable LASS when patching kernel alternatives Alexander Shishkin
2024-10-28 17:49 ` Dave Hansen
2024-10-29 11:36 ` Peter Zijlstra
2024-10-29 18:48 ` Peter Zijlstra
2024-10-30 7:40 ` Alexander Shishkin
2024-10-28 16:07 ` [PATCH v5 04/16] init/main.c: Move EFI runtime service initialization to x86/cpu Alexander Shishkin
2024-10-29 22:35 ` Sohil Mehta
2024-10-30 7:36 ` Ard Biesheuvel
2024-10-28 16:07 ` [PATCH v5 05/16] x86/cpu: Defer CR pinning setup until after EFI initialization Alexander Shishkin
2024-10-29 22:10 ` Sohil Mehta
2024-10-29 22:26 ` Luck, Tony
2024-10-29 22:52 ` Dave Hansen
2024-10-29 22:59 ` Luck, Tony
2024-10-29 23:02 ` H. Peter Anvin [this message]
2024-10-29 23:03 ` Dave Hansen
2024-10-29 23:05 ` H. Peter Anvin
2024-10-29 23:18 ` Luck, Tony
2024-10-29 23:41 ` H. Peter Anvin
2024-10-30 11:43 ` Kirill A. Shutemov
2024-10-28 16:07 ` [PATCH v5 06/16] efi: Disable LASS around set_virtual_address_map call Alexander Shishkin
2024-10-29 15:00 ` Kirill A. Shutemov
2024-10-28 16:07 ` [PATCH v5 07/16] x86/vsyscall: Reorganize the #PF emulation code Alexander Shishkin
2024-10-28 16:07 ` [PATCH v5 08/16] x86/traps: Consolidate user fixups in exc_general_protection() Alexander Shishkin
2024-10-28 16:07 ` [PATCH v5 09/16] x86/vsyscall: Add vsyscall emulation for #GP Alexander Shishkin
2024-10-28 16:07 ` [PATCH v5 10/16] x86/vsyscall: Disable LASS if vsyscall mode is set to EMULATE Alexander Shishkin
2024-10-28 16:07 ` [PATCH v5 11/16] x86/vsyscall: Document the fact that vsyscall=emulate disables LASS Alexander Shishkin
2024-10-29 23:41 ` Sohil Mehta
2024-10-28 16:08 ` [PATCH v5 12/16] x86/cpu: Set LASS CR4 bit as pinning sensitive Alexander Shishkin
2024-10-28 16:08 ` [PATCH v5 13/16] x86/traps: Communicate a LASS violation in #GP message Alexander Shishkin
2024-10-28 16:08 ` [PATCH v5 14/16] x86/cpu: Make LAM depend on LASS Alexander Shishkin
2024-10-31 0:06 ` Sohil Mehta
2024-10-28 16:08 ` [PATCH v5 15/16] x86/cpu: Enable LASS during CPU initialization Alexander Shishkin
2024-10-28 16:08 ` [PATCH v5 16/16] Revert "x86/lam: Disable ADDRESS_MASKING in most cases" Alexander Shishkin
2024-10-28 20:41 ` Kirill A. Shutemov
2024-10-28 22:00 ` Alexander Shishkin
2024-10-29 17:14 ` [PATCH v5 00/16] Enable Linear Address Space Separation support Matthew Wilcox
2024-10-30 7:16 ` Alexander Shishkin
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