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>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 985721a1264c..66743bd1e422 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -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;