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[RFC,v3,16/16] Documentation: arm64: Document ARM Neoverse-N1 erratum #1688567

Message ID 20201027172705.15181-17-alexandru.elisei@arm.com (mailing list archive)
State New, archived
Headers show
Series KVM: arm64: Add Statistical Profiling Extension (SPE) support | expand

Commit Message

Alexandru Elisei Oct. 27, 2020, 5:27 p.m. UTC 
According to erratum #1688567, a SPE buffer write that results in an Access
flag fault or Permission fault at stage 2 is reported with an unsupported
PMBSR_EL1.FSC code.

KVM avoids SPE stage 2 faults altogether by requiring userspace to lock the
guest memory in RAM and pre-mapping it in stage 2 before the VM is started.
As a result, KVM is not impacted by this erratum.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 Documentation/arm64/silicon-errata.rst | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst
index d3587805de64..1f6c403fd555 100644
--- a/Documentation/arm64/silicon-errata.rst
+++ b/Documentation/arm64/silicon-errata.rst
@@ -96,6 +96,8 @@  stable kernels.
 +----------------+-----------------+-----------------+-----------------------------+
 | ARM            | Neoverse-N1     | #1542419        | ARM64_ERRATUM_1542419       |
 +----------------+-----------------+-----------------+-----------------------------+
+| ARM            | Neoverse-N1     | #1688567        | N/A                         |
++----------------+-----------------+-----------------+-----------------------------+
 | ARM            | MMU-500         | #841119,826419  | N/A                         |
 +----------------+-----------------+-----------------+-----------------------------+
 +----------------+-----------------+-----------------+-----------------------------+