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Subject[PATCH 17/40] KVM: ia64: stack get/restore patch
Date
From: Jes Sorensen <jes@sgi.com>

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>
---
arch/ia64/include/asm/kvm.h | 7 +++
arch/ia64/include/asm/kvm_host.h | 6 ++-
arch/ia64/kvm/kvm-ia64.c | 92 ++++++++++++++++++++++++++++++++++++-
include/linux/kvm.h | 3 +
4 files changed, 104 insertions(+), 4 deletions(-)
diff --git a/arch/ia64/include/asm/kvm.h b/arch/ia64/include/asm/kvm.h
index be3fdb8..b514578 100644
--- a/arch/ia64/include/asm/kvm.h
+++ b/arch/ia64/include/asm/kvm.h
@@ -214,6 +214,13 @@ struct kvm_sregs {
struct kvm_fpu {
};

+#define KVM_IA64_VCPU_STACK_SHIFT 16
+#define KVM_IA64_VCPU_STACK_SIZE (1UL << KVM_IA64_VCPU_STACK_SHIFT)
+
+struct kvm_ia64_vcpu_stack {
+ unsigned char stack[KVM_IA64_VCPU_STACK_SIZE];
+};
+
struct kvm_debug_exit_arch {
};

diff --git a/arch/ia64/include/asm/kvm_host.h b/arch/ia64/include/asm/kvm_host.h
index 3486636..7da0c09 100644
--- a/arch/ia64/include/asm/kvm_host.h
+++ b/arch/ia64/include/asm/kvm_host.h
@@ -112,7 +112,11 @@
#define VCPU_STRUCT_SHIFT 16
#define VCPU_STRUCT_SIZE (__IA64_UL_CONST(1) << VCPU_STRUCT_SHIFT)

-#define KVM_STK_OFFSET VCPU_STRUCT_SIZE
+/*
+ * This must match KVM_IA64_VCPU_STACK_{SHIFT,SIZE} arch/ia64/include/asm/kvm.h
+ */
+#define KVM_STK_SHIFT 16
+#define KVM_STK_OFFSET (__IA64_UL_CONST(1)<< KVM_STK_SHIFT)

#define KVM_VM_STRUCT_SHIFT 19
#define KVM_VM_STRUCT_SIZE (__IA64_UL_CONST(1) << KVM_VM_STRUCT_SHIFT)
diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index de47467..1477f91 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;
}
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 429a2ce..28582fc 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -489,6 +489,9 @@ struct kvm_debug_guest {

#define __KVM_DEPRECATED_DEBUG_GUEST _IOW(KVMIO, 0x87, struct kvm_debug_guest)

+#define KVM_IA64_VCPU_GET_STACK _IOR(KVMIO, 0x9a, void *)
+#define KVM_IA64_VCPU_SET_STACK _IOW(KVMIO, 0x9b, void *)
+
#define KVM_TRC_INJ_VIRQ (KVM_TRC_HANDLER + 0x02)
#define KVM_TRC_REDELIVER_EVT (KVM_TRC_HANDLER + 0x03)
#define KVM_TRC_PEND_INTR (KVM_TRC_HANDLER + 0x04)
--
1.6.0.6


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