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KVM: s390/vfio-ap: Fixes and enhancements for vfio-ap

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- add tracing
 - fix a locking bug
 - make local functions and data static
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Merge tag 'kvm-s390-next-4.20-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

KVM: s390/vfio-ap: Fixes and enhancements for vfio-ap

- add tracing
- fix a locking bug
- make local functions and data static
This commit is contained in:
Paolo Bonzini 2018-10-13 12:00:26 +02:00
commit 3d0d0d9b1d
4 changed files with 70 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/s390/include/asm/kvm_host.h
View File

@ -865,6 +865,8 @@ void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
struct kvm_async_pf *work);
void kvm_arch_crypto_clear_masks(struct kvm *kvm);
void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm,
unsigned long *aqm, unsigned long *adm);
extern int sie64a(struct kvm_s390_sie_block *, u64 *);
extern char sie_exit;

57
arch/s390/kvm/kvm-s390.c
View File

@ -859,8 +859,10 @@ static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
mutex_lock(&kvm->lock);
switch (attr->attr) {
case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
if (!test_kvm_facility(kvm, 76))
if (!test_kvm_facility(kvm, 76)) {
mutex_unlock(&kvm->lock);
return -EINVAL;
}
get_random_bytes(
kvm->arch.crypto.crycb->aes_wrapping_key_mask,
sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
@ -868,8 +870,10 @@ static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
break;
case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
if (!test_kvm_facility(kvm, 76))
if (!test_kvm_facility(kvm, 76)) {
mutex_unlock(&kvm->lock);
return -EINVAL;
}
get_random_bytes(
kvm->arch.crypto.crycb->dea_wrapping_key_mask,
sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
@ -877,16 +881,20 @@ static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
break;
case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
if (!test_kvm_facility(kvm, 76))
if (!test_kvm_facility(kvm, 76)) {
mutex_unlock(&kvm->lock);
return -EINVAL;
}
kvm->arch.crypto.aes_kw = 0;
memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0,
sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
break;
case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
if (!test_kvm_facility(kvm, 76))
if (!test_kvm_facility(kvm, 76)) {
mutex_unlock(&kvm->lock);
return -EINVAL;
}
kvm->arch.crypto.dea_kw = 0;
memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0,
sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
@ -2056,6 +2064,46 @@ static void kvm_s390_set_crycb_format(struct kvm *kvm)
kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
}
void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm,
unsigned long *aqm, unsigned long *adm)
{
struct kvm_s390_crypto_cb *crycb = kvm->arch.crypto.crycb;
mutex_lock(&kvm->lock);
kvm_s390_vcpu_block_all(kvm);
switch (kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) {
case CRYCB_FORMAT2: /* APCB1 use 256 bits */
memcpy(crycb->apcb1.apm, apm, 32);
VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx %016lx %016lx %016lx",
apm[0], apm[1], apm[2], apm[3]);
memcpy(crycb->apcb1.aqm, aqm, 32);
VM_EVENT(kvm, 3, "SET CRYCB: aqm %016lx %016lx %016lx %016lx",
aqm[0], aqm[1], aqm[2], aqm[3]);
memcpy(crycb->apcb1.adm, adm, 32);
VM_EVENT(kvm, 3, "SET CRYCB: adm %016lx %016lx %016lx %016lx",
adm[0], adm[1], adm[2], adm[3]);
break;
case CRYCB_FORMAT1:
case CRYCB_FORMAT0: /* Fall through both use APCB0 */
memcpy(crycb->apcb0.apm, apm, 8);
memcpy(crycb->apcb0.aqm, aqm, 2);
memcpy(crycb->apcb0.adm, adm, 2);
VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx aqm %04x adm %04x",
apm[0], *((unsigned short *)aqm),
*((unsigned short *)adm));
break;
default: /* Can not happen */
break;
}
/* recreate the shadow crycb for each vcpu */
kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
kvm_s390_vcpu_unblock_all(kvm);
mutex_unlock(&kvm->lock);
}
EXPORT_SYMBOL_GPL(kvm_arch_crypto_set_masks);
void kvm_arch_crypto_clear_masks(struct kvm *kvm)
{
mutex_lock(&kvm->lock);
@ -2066,6 +2114,7 @@ void kvm_arch_crypto_clear_masks(struct kvm *kvm)
memset(&kvm->arch.crypto.crycb->apcb1, 0,
sizeof(kvm->arch.crypto.crycb->apcb1));
VM_EVENT(kvm, 3, "%s", "CLR CRYCB:");
/* recreate the shadow crycb for each vcpu */
kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
kvm_s390_vcpu_unblock_all(kvm);

4
drivers/s390/crypto/vfio_ap_drv.c
View File

@ -112,7 +112,7 @@ static void vfio_ap_matrix_dev_destroy(void)
root_device_unregister(matrix_dev->device.parent);
}
int __init vfio_ap_init(void)
static int __init vfio_ap_init(void)
{
int ret;
@ -146,7 +146,7 @@ int __init vfio_ap_init(void)
return 0;
}
void __exit vfio_ap_exit(void)
static void __exit vfio_ap_exit(void)
{
vfio_ap_mdev_unregister();
ap_driver_unregister(&vfio_ap_drv);

55
drivers/s390/crypto/vfio_ap_ops.c
View File

@ -77,7 +77,7 @@ static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf)
return sprintf(buf, "%s\n", VFIO_AP_MDEV_NAME_HWVIRT);
}
MDEV_TYPE_ATTR_RO(name);
static MDEV_TYPE_ATTR_RO(name);
static ssize_t available_instances_show(struct kobject *kobj,
struct device *dev, char *buf)
@ -86,7 +86,7 @@ static ssize_t available_instances_show(struct kobject *kobj,
atomic_read(&matrix_dev->available_instances));
}
MDEV_TYPE_ATTR_RO(available_instances);
static MDEV_TYPE_ATTR_RO(available_instances);
static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
char *buf)
@ -94,7 +94,7 @@ static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
return sprintf(buf, "%s\n", VFIO_DEVICE_API_AP_STRING);
}
MDEV_TYPE_ATTR_RO(device_api);
static MDEV_TYPE_ATTR_RO(device_api);
static struct attribute *vfio_ap_mdev_type_attrs[] = {
&mdev_type_attr_name.attr,
@ -395,7 +395,7 @@ static ssize_t unassign_adapter_store(struct device *dev,
return count;
}
DEVICE_ATTR_WO(unassign_adapter);
static DEVICE_ATTR_WO(unassign_adapter);
static int
vfio_ap_mdev_verify_queues_reserved_for_apqi(struct ap_matrix_mdev *matrix_mdev,
@ -491,7 +491,7 @@ static ssize_t assign_domain_store(struct device *dev,
return ret;
}
DEVICE_ATTR_WO(assign_domain);
static DEVICE_ATTR_WO(assign_domain);
/**
@ -537,7 +537,7 @@ static ssize_t unassign_domain_store(struct device *dev,
return count;
}
DEVICE_ATTR_WO(unassign_domain);
static DEVICE_ATTR_WO(unassign_domain);
/**
* assign_control_domain_store
@ -586,7 +586,7 @@ static ssize_t assign_control_domain_store(struct device *dev,
return count;
}
DEVICE_ATTR_WO(assign_control_domain);
static DEVICE_ATTR_WO(assign_control_domain);
/**
* unassign_control_domain_store
@ -630,7 +630,7 @@ static ssize_t unassign_control_domain_store(struct device *dev,
return count;
}
DEVICE_ATTR_WO(unassign_control_domain);
static DEVICE_ATTR_WO(unassign_control_domain);
static ssize_t control_domains_show(struct device *dev,
struct device_attribute *dev_attr,
@ -654,7 +654,7 @@ static ssize_t control_domains_show(struct device *dev,
return nchars;
}
DEVICE_ATTR_RO(control_domains);
static DEVICE_ATTR_RO(control_domains);
static ssize_t matrix_show(struct device *dev, struct device_attribute *attr,
char *buf)
@ -704,7 +704,7 @@ static ssize_t matrix_show(struct device *dev, struct device_attribute *attr,
return nchars;
}
DEVICE_ATTR_RO(matrix);
static DEVICE_ATTR_RO(matrix);
static struct attribute *vfio_ap_mdev_attrs[] = {
&dev_attr_assign_adapter.attr,
@ -727,37 +727,6 @@ static const struct attribute_group *vfio_ap_mdev_attr_groups[] = {
NULL
};
static void vfio_ap_mdev_copy_masks(struct ap_matrix_mdev *matrix_mdev)
{
int nbytes;
unsigned long *apm, *aqm, *adm;
struct kvm_s390_crypto_cb *crycb = matrix_mdev->kvm->arch.crypto.crycb;
switch (matrix_mdev->kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) {
case CRYCB_FORMAT2:
apm = (unsigned long *)crycb->apcb1.apm;
aqm = (unsigned long *)crycb->apcb1.aqm;
adm = (unsigned long *)crycb->apcb1.adm;
break;
case CRYCB_FORMAT1:
case CRYCB_FORMAT0:
apm = (unsigned long *)crycb->apcb0.apm;
aqm = (unsigned long *)crycb->apcb0.aqm;
adm = (unsigned long *)crycb->apcb0.adm;
break;
default:
/* cannot happen */
return;
}
nbytes = DIV_ROUND_UP(matrix_mdev->matrix.apm_max + 1, BITS_PER_BYTE);
memcpy(apm, matrix_mdev->matrix.apm, nbytes);
nbytes = DIV_ROUND_UP(matrix_mdev->matrix.aqm_max + 1, BITS_PER_BYTE);
memcpy(aqm, matrix_mdev->matrix.aqm, nbytes);
nbytes = DIV_ROUND_UP(matrix_mdev->matrix.adm_max + 1, BITS_PER_BYTE);
memcpy(adm, matrix_mdev->matrix.adm, nbytes);
}
/**
* vfio_ap_mdev_set_kvm
*
@ -814,7 +783,9 @@ static int vfio_ap_mdev_group_notifier(struct notifier_block *nb,
if (!matrix_mdev->kvm->arch.crypto.crycbd)
return NOTIFY_DONE;
vfio_ap_mdev_copy_masks(matrix_mdev);
kvm_arch_crypto_set_masks(matrix_mdev->kvm, matrix_mdev->matrix.apm,
matrix_mdev->matrix.aqm,
matrix_mdev->matrix.adm);
return NOTIFY_OK;
}