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KVM: s390: onereg for timer related registers 

Enhance the KVM ONE_REG capability within S390 to allow
getting/setting the following special cpu registers: clock comparator
and the cpu timer. These are needed for migration.

Signed-off-by: Jason J. herne <jjherne@us.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jason J. herne 2012-05-15 14:15:28 +02:00 committed by Marcelo Tosatti
parent 29b7c71b5e
commit 46a6dd1c87
2 changed files with 18 additions and 0 deletions
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2
arch/s390/include/asm/kvm.h
View File

@ -55,4 +55,6 @@ struct kvm_sync_regs {
#define KVM_REG_S390_TODPR (KVM_REG_S390 | KVM_REG_SIZE_U32 | 0x1)
#define KVM_REG_S390_EPOCHDIFF (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x2)
#define KVM_REG_S390_CPU_TIMER (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x3)
#define KVM_REG_S390_CLOCK_COMP (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x4)
#endif

16
arch/s390/kvm/kvm-s390.c
View File

@ -454,6 +454,14 @@ static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
r = put_user(vcpu->arch.sie_block->epoch,
(u64 __user *)reg->addr);
break;
case KVM_REG_S390_CPU_TIMER:
r = put_user(vcpu->arch.sie_block->cputm,
(u64 __user *)reg->addr);
break;
case KVM_REG_S390_CLOCK_COMP:
r = put_user(vcpu->arch.sie_block->ckc,
(u64 __user *)reg->addr);
break;
default:
break;
}
@ -475,6 +483,14 @@ static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
r = get_user(vcpu->arch.sie_block->epoch,
(u64 __user *)reg->addr);
break;
case KVM_REG_S390_CPU_TIMER:
r = get_user(vcpu->arch.sie_block->cputm,
(u64 __user *)reg->addr);
break;
case KVM_REG_S390_CLOCK_COMP:
r = get_user(vcpu->arch.sie_block->ckc,
(u64 __user *)reg->addr);
break;
default:
break;
}