On 13/11/2019 17:22, Steven Price wrote:
Cortex-A55 erratum 1530923 allows TLB entries to be allocated as a
result of a speculative AT instruction. This may happen in the middle of
a guest world switch while the relevant VMSA configuration is in an
inconsistent state, leading to erroneous content being allocated into
TLBs.
The same workaround as is used for Cortex-A76 erratum 1165522
(WORKAROUND_SPECULATIVE_AT_NVE) can be used here. Note that this
mandates the use of VHE on affected parts.
Signed-off-by: Steven Price <steven.price@xxxxxxx>
---
Documentation/arm64/silicon-errata.rst | 2 ++
arch/arm64/Kconfig | 13 +++++++++++++
arch/arm64/include/asm/kvm_hyp.h | 4 ++--
arch/arm64/kernel/cpu_errata.c | 6 +++++-
arch/arm64/kvm/hyp/switch.c | 4 ++--
arch/arm64/kvm/hyp/tlb.c | 4 ++--
6 files changed, 26 insertions(+), 7 deletions(-)
diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst
index 899a72570282..b40cb3e0634e 100644
--- a/Documentation/arm64/silicon-errata.rst
+++ b/Documentation/arm64/silicon-errata.rst
@@ -88,6 +88,8 @@ stable kernels.
+----------------+-----------------+-----------------+-----------------------------+
| ARM | Cortex-A76 | #1463225 | ARM64_ERRATUM_1463225 |
+----------------+-----------------+-----------------+-----------------------------+
+| ARM | Cortex-A55 | #1530923 | ARM64_ERRATUM_1530923 |
++----------------+-----------------+-----------------+-----------------------------+
| ARM | Neoverse-N1 | #1188873,1418040| ARM64_ERRATUM_1418040 |
+----------------+-----------------+-----------------+-----------------------------+
| ARM | Neoverse-N1 | #1349291 | N/A |
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index defb68e45387..d2dd72c19560 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -532,6 +532,19 @@ config ARM64_ERRATUM_1165522
If unsure, say Y.
+config ARM64_ERRATUM_1530923
+ bool "Cortex-A55: Speculative AT instruction using out-of-context translation regime could cause subsequent request to generate an incorrect translation"
+ default y
+ select ARM64_WORKAROUND_SPECULATIVE_AT
ARM64_WORKAROUND_SPECULATIVE_AT_VHE ?
Otherwise looks good to me.
Suzuki
_______________________________________________
kvmarm mailing list
kvmarm@xxxxxxxxxxxxxxxxxxxxx
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
