From: Borislav Petkov <bp@alien8.de>
To: Kees Cook <keescook@chromium.org>
Cc: "Limonciello, Mario" <mario.limonciello@amd.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Martin Fernandez <martin.fernandez@eclypsium.com>,
linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org,
platform-driver-x86@vger.kernel.org, linux-mm@kvack.org,
tglx@linutronix.de, mingo@redhat.com,
dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com,
ardb@kernel.org, dvhart@infradead.org, andy@infradead.org,
gregkh@linuxfoundation.org, rafael@kernel.org, rppt@kernel.org,
akpm@linux-foundation.org, daniel.gutson@eclypsium.com,
hughsient@gmail.com, alex.bazhaniuk@eclypsium.com,
alison.schofield@intel.com
Subject: Re: [PATCH v6 6/6] drivers/node: Show in sysfs node's crypto capabilities
Date: Mon, 7 Feb 2022 11:02:09 +0100 [thread overview]
Message-ID: <YgDuIeYvken1IArn@zn.tnic> (raw)
In-Reply-To: <202202061924.6A2D278@keescook>
On Sun, Feb 06, 2022 at 07:39:46PM -0800, Kees Cook wrote:
> Oh, this seems weird to me, as I'd expect it to show up since the CPU is
> _capable_ of it, even if it's not in use. (Am I really using avx512vl,
> e.g.?)
We're trying to put feature flags in /proc/cpuinfo which mean that the
kernel supports the feature - not every CPUID bit out there. For that
there's tools/arch/x86/kcpuid/kcpuid.c
Otherwise /proc/cpuinfo becomes a dumping ground for feature flags and
there's no shortage of those.
> But as you point out later, it does work that way for a lot of things
> and boot params. If this is the way things are supposed to be done,
> it looks like we should wire up "nx" vs "noexec=off" boot param to do
See here:
https://lore.kernel.org/r/20220127115626.14179-1-bp@alien8.de
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2022-02-07 10:16 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-03 16:43 [PATCH v6 0/6] x86: Show in sysfs if a memory node is able to do encryption Martin Fernandez
2022-02-03 16:43 ` [PATCH v6 1/6] mm/memblock: Tag memblocks with crypto capabilities Martin Fernandez
2022-02-03 18:07 ` Mike Rapoport
2022-02-03 18:24 ` Martin Fernandez
2022-02-07 21:18 ` Kees Cook
2022-02-08 14:39 ` Martin Fernandez
2022-02-03 16:43 ` [PATCH v6 2/6] mm/mmzone: Tag pg_data_t " Martin Fernandez
2022-02-07 21:19 ` Kees Cook
2022-02-03 16:43 ` [PATCH v6 3/6] x86/e820: Refactor range_update and range_remove Martin Fernandez
2022-02-07 21:45 ` Kees Cook
2022-02-08 8:40 ` Mike Rapoport
2022-02-08 21:01 ` Martin Fernandez
2022-02-15 7:10 ` Mike Rapoport
2022-02-15 14:14 ` Martin Fernandez
2022-02-08 21:09 ` Martin Fernandez
2022-03-04 20:32 ` Martin Fernandez
2022-02-08 21:04 ` Daniel Gutson
2022-02-03 16:43 ` [PATCH v6 4/6] x86/e820: Tag e820_entry with crypto capabilities Martin Fernandez
2022-02-07 21:56 ` Kees Cook
2022-02-08 14:46 ` Martin Fernandez
2022-02-03 16:43 ` [PATCH v6 5/6] x86/efi: Tag e820_entries as crypto capable from EFI memmap Martin Fernandez
2022-02-03 16:43 ` [PATCH v6 6/6] drivers/node: Show in sysfs node's crypto capabilities Martin Fernandez
2022-02-04 3:47 ` Limonciello, Mario
2022-02-04 13:21 ` Martin Fernandez
2022-02-04 15:59 ` Tom Lendacky
2022-02-04 16:23 ` Limonciello, Mario
2022-02-04 16:28 ` Borislav Petkov
2022-02-04 17:12 ` Tom Lendacky
2022-02-04 17:49 ` Limonciello, Mario
2022-02-04 18:00 ` Borislav Petkov
2022-02-04 18:49 ` Tom Lendacky
2022-02-04 21:49 ` Borislav Petkov
2022-02-07 3:39 ` Kees Cook
2022-02-07 10:02 ` Borislav Petkov [this message]
2022-02-04 4:56 ` Mike Rapoport
2022-02-04 12:27 ` Martin Fernandez
2022-02-04 13:37 ` Mike Rapoport
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