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KVM: s390: epoch difference and TOD programmable field 

This patch makes vcpu epoch difference and the TOD programmable
field accessible from userspace. This is needed in order to
implement a couple of instructions that deal with the time of
day clock on s390, such as SET CLOCK and for migration.

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Carsten Otte 2012-05-15 14:15:27 +02:00 committed by Marcelo Tosatti
parent 14eebd917d
commit 29b7c71b5e
2 changed files with 19 additions and 0 deletions
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3
arch/s390/include/asm/kvm.h
View File

@ -52,4 +52,7 @@ struct kvm_sync_regs {
__u32 acrs[16]; /* access registers */
__u64 crs[16]; /* control registers */
};
#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)
#endif

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

@ -446,6 +446,14 @@ static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
int r = -EINVAL;
switch (reg->id) {
case KVM_REG_S390_TODPR:
r = put_user(vcpu->arch.sie_block->todpr,
(u32 __user *)reg->addr);
break;
case KVM_REG_S390_EPOCHDIFF:
r = put_user(vcpu->arch.sie_block->epoch,
(u64 __user *)reg->addr);
break;
default:
break;
}
@ -459,6 +467,14 @@ static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
int r = -EINVAL;
switch (reg->id) {
case KVM_REG_S390_TODPR:
r = get_user(vcpu->arch.sie_block->todpr,
(u32 __user *)reg->addr);
break;
case KVM_REG_S390_EPOCHDIFF:
r = get_user(vcpu->arch.sie_block->epoch,
(u64 __user *)reg->addr);
break;
default:
break;
}