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Writes to OSLSR_EL1 are UNDEFINED and should never trap from EL1 to
EL2, but the kvm trap handler for OSLSR_EL1 handles writes via
ignore_write(). This is confusing to readers of code, but should have
no functional impact.
For clarity, use write_to_read_only() rather than ignore_write(). If a
trap is unexpectedly taken to EL2 in violation of the architecture, this
will WARN_ONCE() and inject an undef into the guest.
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
[adopted Mark's changelog suggestion, thanks!]
Signed-off-by: Oliver Upton <oupton@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220203174159.2887882-2-oupton@google.com
e2ffceaae5