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| author | James Morse <james.morse@arm.com> | 2022-01-27 12:20:52 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-02-03 09:22:30 +0000 |
| commit | 1dd498e5e26ad71e3e9130daf72cfb6a693fee03 (patch) | |
| tree | 9c2342019c364c0a3035ccc2297f065a51de8b23 /arch/arm64/kernel/cpu_errata.c | |
| parent | 1229630af88620f6e3a621a1ebd1ca14d9340df7 (diff) | |
| download | linux-1dd498e5e26ad71e3e9130daf72cfb6a693fee03.tar.bz2 | |
KVM: arm64: Workaround Cortex-A510's single-step and PAC trap errata
Cortex-A510's erratum #2077057 causes SPSR_EL2 to be corrupted when
single-stepping authenticated ERET instructions. A single step is
expected, but a pointer authentication trap is taken instead. The
erratum causes SPSR_EL1 to be copied to SPSR_EL2, which could allow
EL1 to cause a return to EL2 with a guest controlled ELR_EL2.
Because the conditions require an ERET into active-not-pending state,
this is only a problem for the EL2 when EL2 is stepping EL1. In this case
the previous SPSR_EL2 value is preserved in struct kvm_vcpu, and can be
restored.
Cc: stable@vger.kernel.org # 53960faf2b73: arm64: Add Cortex-A510 CPU part definition
Cc: stable@vger.kernel.org
Signed-off-by: James Morse <james.morse@arm.com>
[maz: fixup cpucaps ordering]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220127122052.1584324-5-james.morse@arm.com
Diffstat (limited to 'arch/arm64/kernel/cpu_errata.c')
| -rw-r--r-- | arch/arm64/kernel/cpu_errata.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index 066098198c24..b217941713a8 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -600,6 +600,14 @@ const struct arm64_cpu_capabilities arm64_errata[] = { CAP_MIDR_RANGE_LIST(trbe_write_out_of_range_cpus), }, #endif +#ifdef CONFIG_ARM64_ERRATUM_2077057 + { + .desc = "ARM erratum 2077057", + .capability = ARM64_WORKAROUND_2077057, + .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, + ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A510, 0, 0, 2), + }, +#endif #ifdef CONFIG_ARM64_ERRATUM_2064142 { .desc = "ARM erratum 2064142", |