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KVM: CPACF: Enable MSA4 instructions for kvm guest 

We have to provide a per guest crypto block for the CPUs to
enable MSA4 instructions. According to icainfo on z196 or
later this enables CCM-AES-128, CMAC-AES-128, CMAC-AES-192
and CMAC-AES-256.

Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael Mueller <mimu@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
[split MSA4/protected key into two patches]
This commit is contained in:
Tony Krowiak 2014-06-27 14:46:01 -04:00 committed by Christian Borntraeger
parent fd2752352b
commit 5102ee8795
2 changed files with 46 additions and 1 deletions
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14
arch/s390/include/asm/kvm_host.h
View File

@ -157,7 +157,9 @@ struct kvm_s390_sie_block {
__u8 armid; /* 0x00e3 */
__u8 reservede4[4]; /* 0x00e4 */
__u64 tecmc; /* 0x00e8 */
__u8 reservedf0[16]; /* 0x00f0 */
__u8 reservedf0[12]; /* 0x00f0 */
#define CRYCB_FORMAT1 0x00000001
__u32 crycbd; /* 0x00fc */
__u64 gcr[16]; /* 0x0100 */
__u64 gbea; /* 0x0180 */
__u8 reserved188[24]; /* 0x0188 */
@ -410,6 +412,15 @@ struct s390_io_adapter {
#define MAX_S390_IO_ADAPTERS ((MAX_ISC + 1) * 8)
#define MAX_S390_ADAPTER_MAPS 256
struct kvm_s390_crypto {
struct kvm_s390_crypto_cb *crycb;
__u32 crycbd;
};
struct kvm_s390_crypto_cb {
__u8 reserved00[128]; /* 0x0000 */
};
struct kvm_arch{
struct sca_block *sca;
debug_info_t *dbf;
@ -423,6 +434,7 @@ struct kvm_arch{
struct s390_io_adapter *adapters[MAX_S390_IO_ADAPTERS];
wait_queue_head_t ipte_wq;
spinlock_t start_stop_lock;
struct kvm_s390_crypto crypto;
};
#define KVM_HVA_ERR_BAD (-1UL)

33
arch/s390/kvm/kvm-s390.c
View File

@ -392,6 +392,22 @@ long kvm_arch_vm_ioctl(struct file *filp,
return r;
}
static int kvm_s390_crypto_init(struct kvm *kvm)
{
if (!test_vfacility(76))
return 0;
kvm->arch.crypto.crycb = kzalloc(sizeof(*kvm->arch.crypto.crycb),
GFP_KERNEL | GFP_DMA);
if (!kvm->arch.crypto.crycb)
return -ENOMEM;
kvm->arch.crypto.crycbd = (__u32) (unsigned long) kvm->arch.crypto.crycb |
CRYCB_FORMAT1;
return 0;
}
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
int rc;
@ -429,6 +445,9 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
if (!kvm->arch.dbf)
goto out_nodbf;
if (kvm_s390_crypto_init(kvm) < 0)
goto out_crypto;
spin_lock_init(&kvm->arch.float_int.lock);
INIT_LIST_HEAD(&kvm->arch.float_int.list);
init_waitqueue_head(&kvm->arch.ipte_wq);
@ -453,6 +472,8 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
return 0;
out_nogmap:
kfree(kvm->arch.crypto.crycb);
out_crypto:
debug_unregister(kvm->arch.dbf);
out_nodbf:
free_page((unsigned long)(kvm->arch.sca));
@ -507,6 +528,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
kvm_free_vcpus(kvm);
free_page((unsigned long)(kvm->arch.sca));
debug_unregister(kvm->arch.dbf);
kfree(kvm->arch.crypto.crycb);
if (!kvm_is_ucontrol(kvm))
gmap_free(kvm->arch.gmap);
kvm_s390_destroy_adapters(kvm);
@ -588,6 +610,14 @@ int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
return 0;
}
static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
{
if (!test_vfacility(76))
return;
vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
}
void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
{
free_page(vcpu->arch.sie_block->cbrlo);
@ -634,6 +664,9 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
get_cpu_id(&vcpu->arch.cpu_id);
vcpu->arch.cpu_id.version = 0xff;
kvm_s390_vcpu_crypto_setup(vcpu);
return rc;
}