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KVM: Add save/restore supporting of in kernel PIT

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Signed-off-by: Sheng Yang <sheng.yang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Sheng Yang
2008-03-04 00:50:59 +08:00
committed by Avi Kivity
parent 7837699fa6
commit e0f63cb927
5 changed files with 79 additions and 0 deletions
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48
arch/x86/kvm/x86.c
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@ -1504,6 +1504,23 @@ static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
return r;
}
static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
{
int r = 0;
memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
return r;
}
static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
{
int r = 0;
memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
kvm_pit_load_count(kvm, 0, ps->channels[0].count);
return r;
}
/*
* Get (and clear) the dirty memory log for a memory slot.
*/
@ -1657,6 +1674,37 @@ long kvm_arch_vm_ioctl(struct file *filp,
r = 0;
break;
}
case KVM_GET_PIT: {
struct kvm_pit_state ps;
r = -EFAULT;
if (copy_from_user(&ps, argp, sizeof ps))
goto out;
r = -ENXIO;
if (!kvm->arch.vpit)
goto out;
r = kvm_vm_ioctl_get_pit(kvm, &ps);
if (r)
goto out;
r = -EFAULT;
if (copy_to_user(argp, &ps, sizeof ps))
goto out;
r = 0;
break;
}
case KVM_SET_PIT: {
struct kvm_pit_state ps;
r = -EFAULT;
if (copy_from_user(&ps, argp, sizeof ps))
goto out;
r = -ENXIO;
if (!kvm->arch.vpit)
goto out;
r = kvm_vm_ioctl_set_pit(kvm, &ps);
if (r)
goto out;
r = 0;
break;
}
default:
;
}