arm64: KVM: Fix SMCCC handling of unimplemented SMC/HVC calls

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KVM doesn't follow the SMCCC when it comes to unimplemented calls,
and inject an UNDEF instead of returning an error. Since firmware
calls are now used for security mitigation, they are becoming more
common, and the undef is counter productive.

Instead, let's follow the SMCCC which states that -1 must be returned
to the caller when getting an unknown function number.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Marc Zyngier 2018-02-06 17:56:05 +00:00 • committed by Catalin Marinas

parent 30d88c0e3a

commit c0938c72f8

1 changed files with 2 additions and 2 deletions

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arch/arm64/kvm/handle_exit.c

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