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

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commit 20e8175d24 upstream.

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.

Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Marc Zyngier 2018-02-06 17:56:06 +00:00 • committed by Greg Kroah-Hartman

parent f37a798e77

commit 7dffdb31ad

1 changed files with 11 additions and 2 deletions

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arch/arm/kvm/handle_exit.c

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