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KVM: ia64: stack get/restore patch

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Implement KVM_IA64_VCPU_[GS]ET_STACK ioctl calls. This is required
for live migrations.

Patch is based on previous implementation that was part of old
GET/SET_REGS ioctl calls.

Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Jes Sorensen
2008-12-18 12:17:51 +01:00
committed by Avi Kivity
parent ae675ef01c
commit e9a999fe1f
4 changed files with 104 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

92
arch/ia64/kvm/kvm-ia64.c
View File

@@ -1421,6 +1421,23 @@ int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
return 0;
}
int kvm_arch_vcpu_ioctl_get_stack(struct kvm_vcpu *vcpu,
struct kvm_ia64_vcpu_stack *stack)
{
memcpy(stack, vcpu, sizeof(struct kvm_ia64_vcpu_stack));
return 0;
}
int kvm_arch_vcpu_ioctl_set_stack(struct kvm_vcpu *vcpu,
struct kvm_ia64_vcpu_stack *stack)
{
memcpy(vcpu + 1, &stack->stack[0] + sizeof(struct kvm_vcpu),
sizeof(struct kvm_ia64_vcpu_stack) - sizeof(struct kvm_vcpu));
vcpu->arch.exit_data = ((struct kvm_vcpu *)stack)->arch.exit_data;
return 0;
}
void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
{
@@ -1430,9 +1447,78 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
long kvm_arch_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
unsigned int ioctl, unsigned long arg)
{
return -EINVAL;
struct kvm_vcpu *vcpu = filp->private_data;
void __user *argp = (void __user *)arg;
struct kvm_ia64_vcpu_stack *stack = NULL;
long r;
switch (ioctl) {
case KVM_IA64_VCPU_GET_STACK: {
struct kvm_ia64_vcpu_stack __user *user_stack;
void __user *first_p = argp;
r = -EFAULT;
if (copy_from_user(&user_stack, first_p, sizeof(void *)))
goto out;
if (!access_ok(VERIFY_WRITE, user_stack,
sizeof(struct kvm_ia64_vcpu_stack))) {
printk(KERN_INFO "KVM_IA64_VCPU_GET_STACK: "
"Illegal user destination address for stack\n");
goto out;
}
stack = kzalloc(sizeof(struct kvm_ia64_vcpu_stack), GFP_KERNEL);
if (!stack) {
r = -ENOMEM;
goto out;
}
r = kvm_arch_vcpu_ioctl_get_stack(vcpu, stack);
if (r)
goto out;
if (copy_to_user(user_stack, stack,
sizeof(struct kvm_ia64_vcpu_stack)))
goto out;
break;
}
case KVM_IA64_VCPU_SET_STACK: {
struct kvm_ia64_vcpu_stack __user *user_stack;
void __user *first_p = argp;
r = -EFAULT;
if (copy_from_user(&user_stack, first_p, sizeof(void *)))
goto out;
if (!access_ok(VERIFY_READ, user_stack,
sizeof(struct kvm_ia64_vcpu_stack))) {
printk(KERN_INFO "KVM_IA64_VCPU_SET_STACK: "
"Illegal user address for stack\n");
goto out;
}
stack = kmalloc(sizeof(struct kvm_ia64_vcpu_stack), GFP_KERNEL);
if (!stack) {
r = -ENOMEM;
goto out;
}
if (copy_from_user(stack, user_stack,
sizeof(struct kvm_ia64_vcpu_stack)))
goto out;
r = kvm_arch_vcpu_ioctl_set_stack(vcpu, stack);
break;
}
default:
r = -EINVAL;
}
out:
kfree(stack);
return r;
}
int kvm_arch_set_memory_region(struct kvm *kvm,
@@ -1472,7 +1558,7 @@ void kvm_arch_flush_shadow(struct kvm *kvm)
}
long kvm_arch_dev_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
unsigned int ioctl, unsigned long arg)
{
return -EINVAL;
}