From: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
To: Pierre Morel <pmorel@linux.vnet.ibm.com>,
linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org
Cc: freude@de.ibm.com, schwidefsky@de.ibm.com,
heiko.carstens@de.ibm.com, borntraeger@de.ibm.com,
cohuck@redhat.com, kwankhede@nvidia.com,
bjsdjshi@linux.vnet.ibm.com, pbonzini@redhat.com,
alex.williamson@redhat.com, alifm@linux.vnet.ibm.com,
mjrosato@linux.vnet.ibm.com, jjherne@linux.vnet.ibm.com,
thuth@redhat.com, pasic@linux.vnet.ibm.com, berrange@redhat.com,
fiuczy@linux.vnet.ibm.com, buendgen@de.ibm.com
Subject: Re: [PATCH v4 05/15] KVM: s390: enable/disable AP interpretive execution
Date: Tue, 17 Apr 2018 11:02:06 -0400 [thread overview]
Message-ID: <cf928702-db64-93c7-9b89-bf1c66a33cfa@linux.vnet.ibm.com> (raw)
In-Reply-To: <15b60572-40d6-0f03-11f9-c50cb7eb00e8@linux.vnet.ibm.com>
On 04/16/2018 06:51 AM, Pierre Morel wrote:
> On 15/04/2018 23:22, Tony Krowiak wrote:
>> The VFIO AP device model exploits interpretive execution of AP
>> instructions (APIE) to provide guests passthrough access to AP
>> devices. This patch introduces a new interface to enable and
>> disable APIE.
>>
>> Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
>> ---
>> arch/s390/include/asm/kvm-ap.h | 16 ++++++++++++++++
>> arch/s390/include/asm/kvm_host.h | 1 +
>> arch/s390/kvm/kvm-ap.c | 20 ++++++++++++++++++++
>> arch/s390/kvm/kvm-s390.c | 9 +++++++++
>> 4 files changed, 46 insertions(+), 0 deletions(-)
>>
>> diff --git a/arch/s390/include/asm/kvm-ap.h
>> b/arch/s390/include/asm/kvm-ap.h
>> index 736e93e..a6c092e 100644
>> --- a/arch/s390/include/asm/kvm-ap.h
>> +++ b/arch/s390/include/asm/kvm-ap.h
>> @@ -35,4 +35,20 @@
>> */
>> void kvm_ap_build_crycbd(struct kvm *kvm);
>>
>> +/**
>> + * kvm_ap_interpret_instructions
>> + *
>> + * Indicate whether AP instructions shall be interpreted. If they
>> are not
>> + * interpreted, all AP instructions will be intercepted and routed
>> back to
>> + * userspace.
>> + *
>> + * @kvm: the virtual machine attributes
>> + * @enable: indicates whether AP instructions are to be interpreted
>> (true) or
>> + * or not (false).
>> + *
>> + * Returns 0 if completed successfully; otherwise, returns -EOPNOTSUPP
>> + * indicating that AP instructions are not installed on the guest.
>> + */
>> +int kvm_ap_interpret_instructions(struct kvm *kvm, bool enable);
>> +
>> #endif /* _ASM_KVM_AP */
>> diff --git a/arch/s390/include/asm/kvm_host.h
>> b/arch/s390/include/asm/kvm_host.h
>> index 3162783..5470685 100644
>> --- a/arch/s390/include/asm/kvm_host.h
>> +++ b/arch/s390/include/asm/kvm_host.h
>> @@ -715,6 +715,7 @@ struct kvm_s390_crypto {
>> __u32 crycbd;
>> __u8 aes_kw;
>> __u8 dea_kw;
>> + __u8 apie;
>> };
>>
>> #define APCB0_MASK_SIZE 1
>> diff --git a/arch/s390/kvm/kvm-ap.c b/arch/s390/kvm/kvm-ap.c
>> index 991bae4..55d11b5 100644
>> --- a/arch/s390/kvm/kvm-ap.c
>> +++ b/arch/s390/kvm/kvm-ap.c
>> @@ -58,3 +58,23 @@ void kvm_ap_build_crycbd(struct kvm *kvm)
>> }
>> }
>> EXPORT_SYMBOL(kvm_ap_build_crycbd);
>> +
>> +int kvm_ap_interpret_instructions(struct kvm *kvm, bool enable)
>> +{
>> + int ret = 0;
>> +
>> + mutex_lock(&kvm->lock);
>> +
>> + if (!test_kvm_cpu_feat(kvm, KVM_S390_VM_CPU_FEAT_AP)) {
>
> Do we really need to test CPU_FEAT_AP?
Yes we do.
>
>
> I understand that KVM_S390_VM_CPU_FEAT_AP means AP instructions are
> interpreted.
> shouldn't we add this information in the name?
> like KVM_S390_VM_CPU_FEAT_APIE
KVM_S390_VM_CPU_FEAT_AP does NOT mean AP instructions are interpreted,
it means
AP instructions are installed.
>
>> + ret = -EOPNOTSUPP;
>> + goto done;
>> + }
>> +
>> + kvm->arch.crypto.apie = enable;
>> + kvm_s390_vcpu_crypto_reset_all(kvm);
>> +
>> +done:
>> + mutex_unlock(&kvm->lock);
>> + return ret;
>> +}
>> +EXPORT_SYMBOL(kvm_ap_interpret_instructions);
>> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
>> index 55cd897..1dc8566 100644
>> --- a/arch/s390/kvm/kvm-s390.c
>> +++ b/arch/s390/kvm/kvm-s390.c
>> @@ -1901,6 +1901,9 @@ static void kvm_s390_crypto_init(struct kvm *kvm)
>> kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
>> kvm_ap_build_crycbd(kvm);
>>
>> + /* Default setting indicating SIE shall interpret AP
>> instructions */
>> + kvm->arch.crypto.apie = 1;
>> +
>> if (!test_kvm_facility(kvm, 76))
>> return;
>>
>> @@ -2434,6 +2437,12 @@ static void kvm_s390_vcpu_crypto_setup(struct
>> kvm_vcpu *vcpu)
>> {
>> vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
>>
>> + vcpu->arch.sie_block->eca &= ~ECA_APIE;
>> + if (vcpu->kvm->arch.crypto.apie &&
>> + test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_AP))
>
> Do we call xxx_crypto_setup() if KVM does not support AP interpretation?
Yes, kvm_s390_vcpu_crypto_setup(vcpu) is called by kvm_arch_vcpu_setup(vcpu)
as well as from kvm_s390_vcpu_crypto_reset_all(kvm). Calling it has nothing
to do with whether AP interpretation is supported or not as it does much
more than that, including setting up of wrapping keys and the CRYCBD.
>
>> + vcpu->arch.sie_block->eca |= ECA_APIE;
>> +
>> +
>> if (!test_kvm_facility(vcpu->kvm, 76))
>> return;
>>
>
next prev parent reply other threads:[~2018-04-17 15:02 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-15 21:22 [PATCH v4 00/15] s390: vfio-ap: guest dedicated crypto adapters Tony Krowiak
2018-04-15 21:22 ` [PATCH v4 01/15] s390: zcrypt: externalize AP instructions available function Tony Krowiak
2018-04-16 8:44 ` Pierre Morel
2018-04-16 12:11 ` Cornelia Huck
2018-04-17 13:31 ` Tony Krowiak
2018-04-17 16:56 ` Cornelia Huck
2018-04-17 18:14 ` Tony Krowiak
[not found] ` <db4245ec-0191-2c32-5c1c-12af50b944c6@linux.vnet.ibm.com>
2018-04-23 7:04 ` Cornelia Huck
2018-04-16 15:59 ` Pierre Morel
[not found] ` <OFF71B62BB.95581C62-ON00258272.00264957-C1258272.0026A1CA@notes.na.collabserv.com>
2018-04-17 12:44 ` Pierre Morel
2018-05-04 7:19 ` David Hildenbrand
2018-05-07 14:02 ` Tony Krowiak
2018-05-07 14:55 ` David Hildenbrand
2018-04-15 21:22 ` [PATCH v4 02/15] KVM: s390: reset crypto attributes for all vcpus Tony Krowiak
2018-04-17 11:34 ` Cornelia Huck
2018-04-17 13:47 ` Tony Krowiak
2018-04-17 14:09 ` Cornelia Huck
2018-04-17 14:29 ` Halil Pasic
2018-04-17 14:55 ` Tony Krowiak
2018-04-17 15:10 ` Cornelia Huck
2018-04-17 17:54 ` Tony Krowiak
2018-04-15 21:22 ` [PATCH v4 03/15] KVM: s390: refactor crypto initialization Tony Krowiak
2018-04-16 8:56 ` Pierre Morel
[not found] ` <OFE3FE11B1.8E1BDDEF-ON00258272.002AEDB1-C1258272.002B06EF@notes.na.collabserv.com>
2018-04-17 10:10 ` Cornelia Huck
2018-04-17 14:26 ` Tony Krowiak
2018-04-17 15:21 ` Cornelia Huck
2018-04-17 18:08 ` Tony Krowiak
2018-04-18 7:49 ` Cornelia Huck
2018-04-22 14:52 ` Tony Krowiak
2018-04-23 7:03 ` Cornelia Huck
2018-04-24 13:01 ` Tony Krowiak
2018-04-24 13:13 ` Cornelia Huck
2018-04-17 14:15 ` Tony Krowiak
2018-04-17 15:52 ` Pierre Morel
2018-04-22 21:11 ` Tony Krowiak
2018-04-17 14:30 ` Tony Krowiak
2018-04-15 21:22 ` [PATCH v4 04/15] KVM: s390: CPU model support for AP virtualization Tony Krowiak
2018-04-15 21:22 ` [PATCH v4 05/15] KVM: s390: enable/disable AP interpretive execution Tony Krowiak
2018-04-16 10:51 ` Pierre Morel
2018-04-16 11:13 ` Pierre Morel
2018-04-16 11:52 ` Halil Pasic
2018-04-17 15:12 ` Tony Krowiak
2018-04-17 15:09 ` Tony Krowiak
2018-04-17 15:02 ` Tony Krowiak [this message]
2018-04-17 16:13 ` Pierre Morel
2018-04-17 16:22 ` Tony Krowiak
2018-04-17 16:55 ` Pierre Morel
2018-04-17 18:11 ` Tony Krowiak
2018-04-18 8:31 ` Pierre Morel
2018-04-19 14:28 ` Tony Krowiak
2018-04-17 16:34 ` Tony Krowiak
2018-04-16 11:12 ` Halil Pasic
2018-04-17 15:11 ` Tony Krowiak
2018-04-15 21:22 ` [PATCH v4 06/15] s390: vfio-ap: base implementation of VFIO AP device driver Tony Krowiak
2018-04-15 21:22 ` [PATCH v4 07/15] s390: vfio-ap: register matrix device with VFIO mdev framework Tony Krowiak
2018-04-15 21:22 ` [PATCH v4 08/15] KVM: s390: interfaces to (de)configure guest's AP matrix Tony Krowiak
2018-04-16 5:04 ` kbuild test robot
2018-04-23 13:46 ` Pierre Morel
2018-04-25 16:21 ` Tony Krowiak
2018-05-02 14:57 ` Pierre Morel
2018-05-03 14:41 ` Tony Krowiak
2018-05-03 16:01 ` Pierre Morel
2018-05-07 14:14 ` Tony Krowiak
2018-04-15 21:22 ` [PATCH v4 09/15] s390: vfio-ap: sysfs interfaces to configure adapters Tony Krowiak
2018-04-15 21:22 ` [PATCH v4 10/15] s390: vfio-ap: sysfs interfaces to configure domains Tony Krowiak
2018-04-15 21:22 ` [PATCH v4 11/15] s390: vfio-ap: sysfs interfaces to configure control domains Tony Krowiak
2018-04-15 21:22 ` [PATCH v4 12/15] s390: vfio-ap: sysfs interface to view matrix mdev matrix Tony Krowiak
2018-04-15 21:22 ` [PATCH v4 13/15] KVM: s390: configure the guest's AP devices Tony Krowiak
2018-04-16 13:05 ` Pierre Morel
2018-04-16 14:51 ` Halil Pasic
2018-04-17 16:12 ` Tony Krowiak
2018-04-17 16:08 ` Tony Krowiak
2018-04-17 16:18 ` Pierre Morel
2018-04-17 16:36 ` Tony Krowiak
2018-04-18 11:56 ` Pierre Morel
2018-04-22 14:54 ` Tony Krowiak
2018-04-15 21:22 ` [PATCH v4 14/15] s390: vfio-ap: implement VFIO_DEVICE_GET_INFO ioctl Tony Krowiak
2018-04-15 21:22 ` [PATCH v4 15/15] s390: doc: detailed specifications for AP virtualization Tony Krowiak
2018-04-16 13:13 ` Pierre Morel
2018-04-16 13:53 ` Cornelia Huck
2018-04-17 16:16 ` Tony Krowiak
2018-04-17 16:14 ` Tony Krowiak
2018-04-17 16:25 ` Pierre Morel
2018-04-17 16:37 ` Tony Krowiak
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