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

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commit acfb3b883f 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.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marc Zyngier 2018-01-16 10:23:47 +00:00 committed by Greg Kroah-Hartman
parent d641053891
commit 14c7f5bc7a
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/kvm/handle_exit.c
View file

@ -44,7 +44,7 @@ static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
ret = kvm_psci_call(vcpu);
if (ret < 0) {
kvm_inject_undefined(vcpu);
vcpu_set_reg(vcpu, 0, ~0UL);
return 1;
}
@ -53,7 +53,7 @@ static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
kvm_inject_undefined(vcpu);
vcpu_set_reg(vcpu, 0, ~0UL);
return 1;
}