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Subject[PATCH v3 04/14] KVM: s390: device attribute to set AP interpretive execution
Date
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 device attribute in the
KVM_S390_VM_CRYPTO device attribute group to set APIE from
the VFIO AP device defined on the guest.

Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
---
arch/s390/include/asm/kvm_host.h | 1 +
arch/s390/include/uapi/asm/kvm.h | 1 +
arch/s390/kvm/kvm-s390.c | 19 +++++++++++++++++++
3 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 98957c2..bbac5a1 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -699,6 +699,7 @@ struct kvm_s390_crypto {
__u32 crycbd;
__u8 aes_kw;
__u8 dea_kw;
+ __u8 apie;
};

#define APCB0_MASK_SIZE 1
diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h
index a580dec..fdcbeb9 100644
--- a/arch/s390/include/uapi/asm/kvm.h
+++ b/arch/s390/include/uapi/asm/kvm.h
@@ -161,6 +161,7 @@ struct kvm_s390_vm_cpu_subfunc {
#define KVM_S390_VM_CRYPTO_ENABLE_DEA_KW 1
#define KVM_S390_VM_CRYPTO_DISABLE_AES_KW 2
#define KVM_S390_VM_CRYPTO_DISABLE_DEA_KW 3
+#define KVM_S390_VM_CRYPTO_INTERPRET_AP 4

/* kvm attributes for migration mode */
#define KVM_S390_VM_MIGRATION_STOP 0
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index a60c45b..bc46b67 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -815,6 +815,19 @@ static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
break;
+ case KVM_S390_VM_CRYPTO_INTERPRET_AP:
+ if (attr->addr) {
+ if (!test_kvm_cpu_feat(kvm, KVM_S390_VM_CPU_FEAT_AP))
+ return -EOPNOTSUPP;
+ kvm->arch.crypto.apie = 1;
+ VM_EVENT(kvm, 3, "%s",
+ "ENABLE: AP interpretive execution");
+ } else {
+ kvm->arch.crypto.apie = 0;
+ VM_EVENT(kvm, 3, "%s",
+ "DISABLE: AP interpretive execution");
+ }
+ break;
default:
mutex_unlock(&kvm->lock);
return -ENXIO;
@@ -1453,6 +1466,7 @@ static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
+ case KVM_S390_VM_CRYPTO_INTERPRET_AP:
ret = 0;
break;
default:
@@ -2409,6 +2423,11 @@ static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
{
vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;

+ if (vcpu->kvm->arch.crypto.apie)
+ vcpu->arch.sie_block->eca |= ECA_APIE;
+ else
+ vcpu->arch.sie_block->eca &= ~ECA_APIE;
+
if (!test_kvm_facility(vcpu->kvm, 76))
return;

--
1.7.1
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