Commit 3276cc24 authored Jun 18, 2019 by James Morse Committed by Marc Zyngier Jul 05, 2019

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>

parent 5dcd0fdb

Documentation/arm64/silicon-errata.txt

+1 −0

Original line number	Diff line number	Diff line
		@@ -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 \|

arch/arm64/kernel/traps.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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;

Original line number	Diff line number	Diff line
		@@ -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 \|

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