On 20.04.2018 13:59, Janosch Frank wrote:
> Thanks, applied.
>
Well this does not compile, as you use kvm_s390_vcpu_crypto_setup before
declaration. Please fix, then I'll take the patch.
>
> On 19.04.2018 23:13, Tony Krowiak wrote:
>> Introduces a new function to reset the crypto attributes for all
>> vcpus whether they are running or not. Each vcpu in KVM will
>> be removed from SIE prior to resetting the crypto attributes in its
>> SIE state description. After all vcpus have had their crypto attributes
>> reset the vcpus will be restored to SIE.
>>
>> This function is incorporated into the kvm_s390_vm_set_crypto(kvm)
>> function to fix a reported issue whereby the crypto key wrapping
>> attributes could potentially get out of synch for running vcpus.
>>
>> Reported-by: Halil Pasic <pasic@xxxxxxxxxxxxxxxxxx>
>> Signed-off-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxxxxxxx>
>> ---
>> arch/s390/kvm/kvm-s390.c | 18 ++++++++++++++----
>> arch/s390/kvm/kvm-s390.h | 13 +++++++++++++
>> 2 files changed, 27 insertions(+), 4 deletions(-)
>>
>> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
>> index fa355a6..4fa3037 100644
>> --- a/arch/s390/kvm/kvm-s390.c
>> +++ b/arch/s390/kvm/kvm-s390.c
>> @@ -789,6 +789,19 @@ static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *att
>> return ret;
>> }
>>
>> +void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm)
>> + {
>> + int i;
>> + struct kvm_vcpu *vcpu;
>> +
>> + kvm_s390_vcpu_block_all(kvm);
>> +
>> + kvm_for_each_vcpu(i, vcpu, kvm)
>> + kvm_s390_vcpu_crypto_setup(vcpu);
>> +
>> + kvm_s390_vcpu_unblock_all(kvm);
>> +}
>> +
>> static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu);
>>
>> static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
>> @@ -832,10 +845,7 @@ static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
>> return -ENXIO;
>> }
>>
>> - kvm_for_each_vcpu(i, vcpu, kvm) {
>> - kvm_s390_vcpu_crypto_setup(vcpu);
>> - exit_sie(vcpu);
>> - }
>> + kvm_s390_vcpu_crypto_reset_all(kvm);
>> mutex_unlock(&kvm->lock);
>> return 0;
>> }
>> diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
>> index 1b5621f..981e3ba 100644
>> --- a/arch/s390/kvm/kvm-s390.h
>> +++ b/arch/s390/kvm/kvm-s390.h
>> @@ -410,4 +410,17 @@ static inline int kvm_s390_use_sca_entries(void)
>> }
>> void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
>> struct mcck_volatile_info *mcck_info);
>> +
>> +/**
>> + * kvm_s390_vcpu_crypto_reset_all
>> + *
>> + * Reset the crypto attributes for each vcpu. This can be done while the vcpus
>> + * are running as each vcpu will be removed from SIE before resetting the crypt
>> + * attributes and restored to SIE afterward.
>> + *
>> + * Note: The kvm->lock must be held while calling this function
>> + *
>> + * @kvm: the KVM guest
>> + */
>> +void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm);
>> #endif
>>
>
>
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