FEAT_HPMN0 is a small feature which defines that it is valid for
MDCR_EL2.HPMN to be set to 0, meaning "no PMU event counters provided
to an EL1 guest" (previously this setting was reserved). QEMU's
implementation almost gets HPMN == 0 right, but we need to fix
one check in pmevcntr_is_64_bit(). That is enough for us to
advertise the feature in the 'max' CPU.
(We don't need to make the behaviour conditional on feature
presence, because the FEAT_HPMN0 behaviour is within the range
of permitted UNPREDICTABLE behaviour for a non-FEAT_HPMN0
implementation.)
Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
---
docs/system/arm/emulation.rst | 1 +
target/arm/helper.c | 2 +-
target/arm/tcg/cpu32.c | 4 ++++
target/arm/tcg/cpu64.c | 1 +
4 files changed, 7 insertions(+), 1 deletion(-)