From e9a999fe1feaddb71bffbacbbd68e0da8ca8b50b Mon Sep 17 00:00:00 2001 From: Jes Sorensen Date: Thu, 18 Dec 2008 12:17:51 +0100 Subject: KVM: ia64: stack get/restore patch 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 Signed-off-by: Avi Kivity --- arch/ia64/kvm/kvm-ia64.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 89 insertions(+), 3 deletions(-) (limited to 'arch/ia64/kvm') diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c index de47467a0e61..1477f91617a5 100644 --- a/arch/ia64/kvm/kvm-ia64.c +++ b/arch/ia64/kvm/kvm-ia64.c @@ -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; } -- cgit v1.2.3