KVM: arm64: Inject UNDEF on PMU access when no PMU configured

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The ARMv8 architecture says that in the absence of FEAT_PMUv3,
all the PMU-related register generate an UNDEF. Let's make
sure that all our PMU handers catch this case by hooking into
check_pmu_access_disabled(), and add checks in a couple of
other places.

Note that we still cannot deliver an exception into the guest
as the offending cases are already caught by the RAZ/WI handling.
But this puts us one step away to architectural compliance.

Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>

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This commit is contained in:

Marc Zyngier 2020-11-12 18:49:28 +00:00

parent 77da43039a

commit b0737e999e

1 changed files with 8 additions and 4 deletions

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arch/arm64/kvm/sys_regs.c

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