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KVM: s390: Provide guest TOD Clock Get/Set Controls

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Provide controls for setting/getting the guest TOD clock based on the VM
attribute interface.

Provide TOD and TOD_HIGH vm attributes on s390 for managing guest Time Of
Day clock value.

TOD_HIGH is presently always set to 0. In the future it will contain a high
order expansion of the tod clock value after it overflows the 64-bits of
the TOD.

Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Jason J. Herne 2014-11-25 09:46:02 -05:00 committed by Christian Borntraeger
parent 556cc0dab1
commit 72f250206f
3 changed files with 134 additions and 0 deletions
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1
arch/s390/include/asm/kvm_host.h
View File

@ -528,6 +528,7 @@ struct kvm_arch{
struct mutex ipte_mutex;
spinlock_t start_stop_lock;
struct kvm_s390_crypto crypto;
u64 epoch;
};
#define KVM_HVA_ERR_BAD (-1UL)

5
arch/s390/include/uapi/asm/kvm.h
View File

@ -57,12 +57,17 @@ struct kvm_s390_io_adapter_req {
/* kvm attr_group on vm fd */
#define KVM_S390_VM_MEM_CTRL 0
#define KVM_S390_VM_TOD 1
/* kvm attributes for mem_ctrl */
#define KVM_S390_VM_MEM_ENABLE_CMMA 0
#define KVM_S390_VM_MEM_CLR_CMMA 1
#define KVM_S390_VM_MEM_LIMIT_SIZE 2
/* kvm attributes for KVM_S390_VM_TOD */
#define KVM_S390_VM_TOD_LOW 0
#define KVM_S390_VM_TOD_HIGH 1
/* for KVM_GET_REGS and KVM_SET_REGS */
struct kvm_regs {
/* general purpose regs for s390 */

128
arch/s390/kvm/kvm-s390.c
View File

@ -342,6 +342,113 @@ static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *att
return ret;
}
static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
{
u8 gtod_high;
if (copy_from_user(&gtod_high, (void __user *)attr->addr,
sizeof(gtod_high)))
return -EFAULT;
if (gtod_high != 0)
return -EINVAL;
return 0;
}
static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
{
struct kvm_vcpu *cur_vcpu;
unsigned int vcpu_idx;
u64 host_tod, gtod;
int r;
if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
return -EFAULT;
r = store_tod_clock(&host_tod);
if (r)
return r;
mutex_lock(&kvm->lock);
kvm->arch.epoch = gtod - host_tod;
kvm_for_each_vcpu(vcpu_idx, cur_vcpu, kvm) {
cur_vcpu->arch.sie_block->epoch = kvm->arch.epoch;
exit_sie(cur_vcpu);
}
mutex_unlock(&kvm->lock);
return 0;
}
static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
{
int ret;
if (attr->flags)
return -EINVAL;
switch (attr->attr) {
case KVM_S390_VM_TOD_HIGH:
ret = kvm_s390_set_tod_high(kvm, attr);
break;
case KVM_S390_VM_TOD_LOW:
ret = kvm_s390_set_tod_low(kvm, attr);
break;
default:
ret = -ENXIO;
break;
}
return ret;
}
static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
{
u8 gtod_high = 0;
if (copy_to_user((void __user *)attr->addr, &gtod_high,
sizeof(gtod_high)))
return -EFAULT;
return 0;
}
static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
{
u64 host_tod, gtod;
int r;
r = store_tod_clock(&host_tod);
if (r)
return r;
gtod = host_tod + kvm->arch.epoch;
if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
return -EFAULT;
return 0;
}
static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
{
int ret;
if (attr->flags)
return -EINVAL;
switch (attr->attr) {
case KVM_S390_VM_TOD_HIGH:
ret = kvm_s390_get_tod_high(kvm, attr);
break;
case KVM_S390_VM_TOD_LOW:
ret = kvm_s390_get_tod_low(kvm, attr);
break;
default:
ret = -ENXIO;
break;
}
return ret;
}
static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
int ret;
@ -350,6 +457,9 @@ static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
case KVM_S390_VM_MEM_CTRL:
ret = kvm_s390_set_mem_control(kvm, attr);
break;
case KVM_S390_VM_TOD:
ret = kvm_s390_set_tod(kvm, attr);
break;
default:
ret = -ENXIO;
break;
@ -366,6 +476,9 @@ static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
case KVM_S390_VM_MEM_CTRL:
ret = kvm_s390_get_mem_control(kvm, attr);
break;
case KVM_S390_VM_TOD:
ret = kvm_s390_get_tod(kvm, attr);
break;
default:
ret = -ENXIO;
break;
@ -391,6 +504,17 @@ static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
break;
}
break;
case KVM_S390_VM_TOD:
switch (attr->attr) {
case KVM_S390_VM_TOD_LOW:
case KVM_S390_VM_TOD_HIGH:
ret = 0;
break;
default:
ret = -ENXIO;
break;
}
break;
default:
ret = -ENXIO;
break;
@ -541,6 +665,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
kvm->arch.css_support = 0;
kvm->arch.use_irqchip = 0;
kvm->arch.epoch = 0;
spin_lock_init(&kvm->arch.start_stop_lock);
@ -686,6 +811,9 @@ static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
{
mutex_lock(&vcpu->kvm->lock);
vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
mutex_unlock(&vcpu->kvm->lock);
if (!kvm_is_ucontrol(vcpu->kvm))
vcpu->arch.gmap = vcpu->kvm->arch.gmap;
}