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commit 471470bc70
upstream.
Implement the workaround for ARM Cortex-A520 erratum 2966298. On an
affected Cortex-A520 core, a speculatively executed unprivileged load
might leak data from a privileged load via a cache side channel. The
issue only exists for loads within a translation regime with the same
translation (e.g. same ASID and VMID). Therefore, the issue only affects
the return to EL0.
The workaround is to execute a TLBI before returning to EL0 after all
loads of privileged data. A non-shareable TLBI to any address is
sufficient.
The workaround isn't necessary if page table isolation (KPTI) is
enabled, but for simplicity it will be. Page table isolation should
normally be disabled for Cortex-A520 as it supports the CSV3 feature
and the E0PD feature (used when KASLR is enabled).
Cc: stable@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230921194156.1050055-2-robh@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
223 lines
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ReStructuredText
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ReStructuredText
=======================================
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Silicon Errata and Software Workarounds
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=======================================
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Author: Will Deacon <will.deacon@arm.com>
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Date : 27 November 2015
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It is an unfortunate fact of life that hardware is often produced with
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so-called "errata", which can cause it to deviate from the architecture
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under specific circumstances. For hardware produced by ARM, these
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errata are broadly classified into the following categories:
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========== ========================================================
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Category A A critical error without a viable workaround.
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Category B A significant or critical error with an acceptable
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workaround.
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Category C A minor error that is not expected to occur under normal
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operation.
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========== ========================================================
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For more information, consult one of the "Software Developers Errata
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Notice" documents available on infocenter.arm.com (registration
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required).
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As far as Linux is concerned, Category B errata may require some special
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treatment in the operating system. For example, avoiding a particular
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sequence of code, or configuring the processor in a particular way. A
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less common situation may require similar actions in order to declassify
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a Category A erratum into a Category C erratum. These are collectively
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known as "software workarounds" and are only required in the minority of
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cases (e.g. those cases that both require a non-secure workaround *and*
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can be triggered by Linux).
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For software workarounds that may adversely impact systems unaffected by
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the erratum in question, a Kconfig entry is added under "Kernel
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Features" -> "ARM errata workarounds via the alternatives framework".
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These are enabled by default and patched in at runtime when an affected
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CPU is detected. For less-intrusive workarounds, a Kconfig option is not
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available and the code is structured (preferably with a comment) in such
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a way that the erratum will not be hit.
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This approach can make it slightly onerous to determine exactly which
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errata are worked around in an arbitrary kernel source tree, so this
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file acts as a registry of software workarounds in the Linux Kernel and
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will be updated when new workarounds are committed and backported to
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stable kernels.
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+----------------+-----------------+-----------------+-----------------------------+
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| Implementor | Component | Erratum ID | Kconfig |
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+================+=================+=================+=============================+
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| Allwinner | A64/R18 | UNKNOWN1 | SUN50I_ERRATUM_UNKNOWN1 |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| Ampere | AmpereOne | AC03_CPU_38 | AMPERE_ERRATUM_AC03_CPU_38 |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A510 | #2457168 | ARM64_ERRATUM_2457168 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A510 | #2064142 | ARM64_ERRATUM_2064142 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A510 | #2038923 | ARM64_ERRATUM_2038923 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A510 | #1902691 | ARM64_ERRATUM_1902691 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A520 | #2966298 | ARM64_ERRATUM_2966298 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A53 | #826319 | ARM64_ERRATUM_826319 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A53 | #827319 | ARM64_ERRATUM_827319 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A53 | #824069 | ARM64_ERRATUM_824069 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A53 | #819472 | ARM64_ERRATUM_819472 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A53 | #845719 | ARM64_ERRATUM_845719 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A53 | #843419 | ARM64_ERRATUM_843419 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A55 | #1024718 | ARM64_ERRATUM_1024718 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A55 | #1530923 | ARM64_ERRATUM_1530923 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A55 | #2441007 | ARM64_ERRATUM_2441007 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A57 | #832075 | ARM64_ERRATUM_832075 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A57 | #852523 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A57 | #834220 | ARM64_ERRATUM_834220 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A57 | #1319537 | ARM64_ERRATUM_1319367 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A57 | #1742098 | ARM64_ERRATUM_1742098 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A72 | #853709 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A72 | #1319367 | ARM64_ERRATUM_1319367 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A72 | #1655431 | ARM64_ERRATUM_1742098 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A73 | #858921 | ARM64_ERRATUM_858921 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A76 | #1188873,1418040| ARM64_ERRATUM_1418040 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A76 | #1165522 | ARM64_ERRATUM_1165522 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A76 | #1286807 | ARM64_ERRATUM_1286807 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A76 | #1463225 | ARM64_ERRATUM_1463225 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A77 | #1508412 | ARM64_ERRATUM_1508412 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A510 | #2051678 | ARM64_ERRATUM_2051678 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A510 | #2077057 | ARM64_ERRATUM_2077057 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A510 | #2441009 | ARM64_ERRATUM_2441009 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A510 | #2658417 | ARM64_ERRATUM_2658417 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A710 | #2119858 | ARM64_ERRATUM_2119858 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A710 | #2054223 | ARM64_ERRATUM_2054223 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A710 | #2224489 | ARM64_ERRATUM_2224489 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-X2 | #2119858 | ARM64_ERRATUM_2119858 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-X2 | #2224489 | ARM64_ERRATUM_2224489 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Neoverse-N1 | #1188873,1418040| ARM64_ERRATUM_1418040 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Neoverse-N1 | #1349291 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Neoverse-N1 | #1542419 | ARM64_ERRATUM_1542419 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Neoverse-N2 | #2139208 | ARM64_ERRATUM_2139208 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Neoverse-N2 | #2067961 | ARM64_ERRATUM_2067961 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Neoverse-N2 | #2253138 | ARM64_ERRATUM_2253138 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | MMU-500 | #841119,826419 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | MMU-600 | #1076982,1209401| N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | MMU-700 | #2268618,2812531| N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| Broadcom | Brahma-B53 | N/A | ARM64_ERRATUM_845719 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Broadcom | Brahma-B53 | N/A | ARM64_ERRATUM_843419 |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX ITS | #22375,24313 | CAVIUM_ERRATUM_22375 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX ITS | #23144 | CAVIUM_ERRATUM_23144 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX GICv3 | #23154,38545 | CAVIUM_ERRATUM_23154 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX GICv3 | #38539 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX Core | #27456 | CAVIUM_ERRATUM_27456 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX Core | #30115 | CAVIUM_ERRATUM_30115 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX SMMUv2 | #27704 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX2 SMMUv3| #74 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX2 SMMUv3| #126 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX2 Core | #219 | CAVIUM_TX2_ERRATUM_219 |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| Marvell | ARM-MMU-500 | #582743 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| NVIDIA | Carmel Core | N/A | NVIDIA_CARMEL_CNP_ERRATUM |
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+----------------+-----------------+-----------------+-----------------------------+
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| NVIDIA | T241 GICv3/4.x | T241-FABRIC-4 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| Freescale/NXP | LS2080A/LS1043A | A-008585 | FSL_ERRATUM_A008585 |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| Hisilicon | Hip0{5,6,7} | #161010101 | HISILICON_ERRATUM_161010101 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Hisilicon | Hip0{6,7} | #161010701 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| Hisilicon | Hip0{6,7} | #161010803 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| Hisilicon | Hip07 | #161600802 | HISILICON_ERRATUM_161600802 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Hisilicon | Hip08 SMMU PMCG | #162001800 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| Hisilicon | Hip08 SMMU PMCG | #162001900 | N/A |
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| | Hip09 SMMU PMCG | | |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | Kryo/Falkor v1 | E1003 | QCOM_FALKOR_ERRATUM_1003 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | Kryo/Falkor v1 | E1009 | QCOM_FALKOR_ERRATUM_1009 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | QDF2400 ITS | E0065 | QCOM_QDF2400_ERRATUM_0065 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | Falkor v{1,2} | E1041 | QCOM_FALKOR_ERRATUM_1041 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | Kryo4xx Gold | N/A | ARM64_ERRATUM_1463225 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | Kryo4xx Gold | N/A | ARM64_ERRATUM_1418040 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | Kryo4xx Silver | N/A | ARM64_ERRATUM_1530923 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | Kryo4xx Silver | N/A | ARM64_ERRATUM_1024718 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | Kryo4xx Gold | N/A | ARM64_ERRATUM_1286807 |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| Fujitsu | A64FX | E#010001 | FUJITSU_ERRATUM_010001 |
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+----------------+-----------------+-----------------+-----------------------------+
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