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KVM: in-kernel LAPIC save and restore support

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This patch adds a new vcpu-based IOCTL to save and restore the local
apic registers for a single vcpu. The kernel only copies the apic page as
a whole, extraction of registers is left to userspace side. On restore, the
APIC timer is restarted from the initial count, this introduces a little
delay, but works fine.

Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Eddie Dong
2007-09-06 12:22:56 +03:00
committed by Avi Kivity
parent 6bf9e962d1
commit 96ad2cc613
4 changed files with 68 additions and 0 deletions
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46
drivers/kvm/kvm_main.c
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@@ -2642,6 +2642,27 @@ static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
return 0;
}
static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
struct kvm_lapic_state *s)
{
vcpu_load(vcpu);
memcpy(s->regs, vcpu->apic->regs, sizeof *s);
vcpu_put(vcpu);
return 0;
}
static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
struct kvm_lapic_state *s)
{
vcpu_load(vcpu);
memcpy(vcpu->apic->regs, s->regs, sizeof *s);
kvm_apic_post_state_restore(vcpu);
vcpu_put(vcpu);
return 0;
}
static long kvm_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
@@ -2811,6 +2832,31 @@ static long kvm_vcpu_ioctl(struct file *filp,
r = 0;
break;
}
case KVM_GET_LAPIC: {
struct kvm_lapic_state lapic;
memset(&lapic, 0, sizeof lapic);
r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic);
if (r)
goto out;
r = -EFAULT;
if (copy_to_user(argp, &lapic, sizeof lapic))
goto out;
r = 0;
break;
}
case KVM_SET_LAPIC: {
struct kvm_lapic_state lapic;
r = -EFAULT;
if (copy_from_user(&lapic, argp, sizeof lapic))
goto out;
r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);;
if (r)
goto out;
r = 0;
break;
}
default:
;
}