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arm64: Update silicon-errata.txt for Neoverse-N1 #1349291 

Neoverse-N1 affected by #1349291 may report an Uncontained RAS Error
as Unrecoverable. The kernel's architecture code already considers
Unrecoverable errors as fatal as without kernel-first support no
further error-handling is possible.

Now that KVM attributes SError to the host/guest more precisely
the host's architecture code will always handle host errors that
become pending during world-switch.
Errors misclassified by this errata that affected the guest will be
re-injected to the guest as an implementation-defined SError, which can
be uncontained.

Until kernel-first support is implemented, no workaround is needed
for this issue.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
James Morse 2019-06-18 16:17:38 +01:00 committed by Marc Zyngier
parent 5dcd0fdbb4
commit 3276cc2489
2 changed files with 5 additions and 0 deletions
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1
Documentation/arm64/silicon-errata.txt
View File

@ -63,6 +63,7 @@ stable kernels.
| ARM | Cortex-A76 | #1286807 | ARM64_ERRATUM_1286807 |
| ARM | Cortex-A76 | #1463225 | ARM64_ERRATUM_1463225 |
| ARM | Neoverse-N1 | #1188873,1418040| ARM64_ERRATUM_1418040 |
| ARM | Neoverse-N1 | #1349291 | N/A |
| ARM | MMU-500 | #841119,826419 | N/A |
| | | | |
| Cavium | ThunderX ITS | #22375,24313 | CAVIUM_ERRATUM_22375 |

4
arch/arm64/kernel/traps.c
View File

@ -880,6 +880,10 @@ bool arm64_is_fatal_ras_serror(struct pt_regs *regs, unsigned int esr)
/*
* The CPU can't make progress. The exception may have
* been imprecise.
*
* Neoverse-N1 #1349291 means a non-KVM SError reported as
* Unrecoverable should be treated as Uncontainable. We
* call arm64_serror_panic() in both cases.
*/
return true;