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| author | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2015-06-10 15:19:24 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2015-06-17 09:46:29 +0100 |
| commit | e2d997366dc5b6c9d14035867f73957f93e7578c (patch) | |
| tree | 08295bb14e5a7d86f51a8fe77c6981e8c9e32e92 /arch/arm/kvm | |
| parent | 921ef1e16c762db13be740a35e691104d6740572 (diff) | |
| download | linux-e2d997366dc5b6c9d14035867f73957f93e7578c.tar.bz2 | |
ARM: kvm: psci: fix handling of unimplemented functions
According to the PSCI specification and the SMC/HVC calling
convention, PSCI function_ids that are not implemented must
return NOT_SUPPORTED as return value.
Current KVM implementation takes an unhandled PSCI function_id
as an error and injects an undefined instruction into the guest
if PSCI implementation is called with a function_id that is not
handled by the resident PSCI version (ie it is not implemented),
which is not the behaviour expected by a guest when calling a
PSCI function_id that is not implemented.
This patch fixes this issue by returning NOT_SUPPORTED whenever
the kvm PSCI call is executed for a function_id that is not
implemented by the PSCI kvm layer.
Cc: <stable@vger.kernel.org> # 3.18+
Cc: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm/kvm')
| -rw-r--r-- | arch/arm/kvm/psci.c | 16 |
1 files changed, 3 insertions, 13 deletions
diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c index 02fa8eff6ae1..531e922486b2 100644 --- a/arch/arm/kvm/psci.c +++ b/arch/arm/kvm/psci.c @@ -230,10 +230,6 @@ static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu) case PSCI_0_2_FN64_AFFINITY_INFO: val = kvm_psci_vcpu_affinity_info(vcpu); break; - case PSCI_0_2_FN_MIGRATE: - case PSCI_0_2_FN64_MIGRATE: - val = PSCI_RET_NOT_SUPPORTED; - break; case PSCI_0_2_FN_MIGRATE_INFO_TYPE: /* * Trusted OS is MP hence does not require migration @@ -242,10 +238,6 @@ static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu) */ val = PSCI_0_2_TOS_MP; break; - case PSCI_0_2_FN_MIGRATE_INFO_UP_CPU: - case PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU: - val = PSCI_RET_NOT_SUPPORTED; - break; case PSCI_0_2_FN_SYSTEM_OFF: kvm_psci_system_off(vcpu); /* @@ -271,7 +263,8 @@ static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu) ret = 0; break; default: - return -EINVAL; + val = PSCI_RET_NOT_SUPPORTED; + break; } *vcpu_reg(vcpu, 0) = val; @@ -291,12 +284,9 @@ static int kvm_psci_0_1_call(struct kvm_vcpu *vcpu) case KVM_PSCI_FN_CPU_ON: val = kvm_psci_vcpu_on(vcpu); break; - case KVM_PSCI_FN_CPU_SUSPEND: - case KVM_PSCI_FN_MIGRATE: + default: val = PSCI_RET_NOT_SUPPORTED; break; - default: - return -EINVAL; } *vcpu_reg(vcpu, 0) = val; |