Wrap the existing implementation of the KVM_{GET,SET}_CLOCK ioctls in
helper methods.
No functional change intended.
Signed-off-by: Oliver Upton <oupton@xxxxxxxxxx>
---
arch/x86/kvm/x86.c | 107 ++++++++++++++++++++++++---------------------
1 file changed, 57 insertions(+), 50 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2f3929bd5f58..39eaa2fb2001 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5833,12 +5833,65 @@ int kvm_arch_pm_notifier(struct kvm *kvm, unsigned long state)
}
#endif /* CONFIG_HAVE_KVM_PM_NOTIFIER */
+static int kvm_vm_ioctl_get_clock(struct kvm *kvm, void __user *argp)
+{
+ struct kvm_clock_data data;
+
+ /*
+ * Zero flags as it is accessed RMW, leave everything else
+ * uninitialized as clock is always written and no other fields
+ * are consumed.
+ */
+ data.flags = 0;
+ get_kvmclock(kvm, &data);
+ memset(&data.pad, 0, sizeof(data.pad));
+
+ if (copy_to_user(argp, &data, sizeof(data)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int kvm_vm_ioctl_set_clock(struct kvm *kvm, void __user *argp)
+{
+ struct kvm_arch *ka = &kvm->arch;
+ struct kvm_clock_data data;
+ u64 now_ns;
+
+ if (copy_from_user(&data, argp, sizeof(data)))
+ return -EFAULT;
+
+ if (data.flags)
+ return -EINVAL;
+
+ kvm_hv_invalidate_tsc_page(kvm);
+ kvm_start_pvclock_update(kvm);
+ pvclock_update_vm_gtod_copy(kvm);
+
+ /*
+ * This pairs with kvm_guest_time_update(): when masterclock is
+ * in use, we use master_kernel_ns + kvmclock_offset to set
+ * unsigned 'system_time' so if we use get_kvmclock_ns() (which
+ * is slightly ahead) here we risk going negative on unsigned
+ * 'system_time' when 'data.clock' is very small.
+ */
+ if (kvm->arch.use_master_clock)
+ now_ns = ka->master_kernel_ns;
+ else
+ now_ns = get_kvmclock_base_ns();
+ ka->kvmclock_offset = data.clock - now_ns;
+ kvm_end_pvclock_update(kvm);
+
+ return 0;
+}
+
long kvm_arch_vm_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
struct kvm *kvm = filp->private_data;
void __user *argp = (void __user *)arg;
int r = -ENOTTY;
+
/*
* This union makes it completely explicit to gcc-3.x
* that these two variables' stack usage should be
@@ -6076,58 +6129,12 @@ long kvm_arch_vm_ioctl(struct file *filp,
break;
}
#endif
- case KVM_SET_CLOCK: {
- struct kvm_arch *ka = &kvm->arch;
- struct kvm_clock_data user_ns;
- u64 now_ns;
-
- r = -EFAULT;
- if (copy_from_user(&user_ns, argp, sizeof(user_ns)))
- goto out;
-
- r = -EINVAL;
- if (user_ns.flags)
- goto out;
-
- r = 0;
-
- kvm_hv_invalidate_tsc_page(kvm);
- kvm_start_pvclock_update(kvm);
- pvclock_update_vm_gtod_copy(kvm);
-
- /*
- * This pairs with kvm_guest_time_update(): when masterclock is
- * in use, we use master_kernel_ns + kvmclock_offset to set
- * unsigned 'system_time' so if we use get_kvmclock_ns() (which
- * is slightly ahead) here we risk going negative on unsigned
- * 'system_time' when 'user_ns.clock' is very small.
- */
- if (kvm->arch.use_master_clock)
- now_ns = ka->master_kernel_ns;
- else
- now_ns = get_kvmclock_base_ns();
- ka->kvmclock_offset = user_ns.clock - now_ns;
- kvm_end_pvclock_update(kvm);
+ case KVM_SET_CLOCK:
+ r = kvm_vm_ioctl_set_clock(kvm, argp);
break;
- }
- case KVM_GET_CLOCK: {
- struct kvm_clock_data user_ns;
-
- /*
- * Zero flags as it is accessed RMW, leave everything else
- * uninitialized as clock is always written and no other fields
- * are consumed.
- */
- user_ns.flags = 0;
- get_kvmclock(kvm, &user_ns);
- memset(&user_ns.pad, 0, sizeof(user_ns.pad));
-
- r = -EFAULT;
- if (copy_to_user(argp, &user_ns, sizeof(user_ns)))
- goto out;
- r = 0;
+ case KVM_GET_CLOCK:
+ r = kvm_vm_ioctl_get_clock(kvm, argp);
break;
- }
case KVM_MEMORY_ENCRYPT_OP: {
r = -ENOTTY;
if (kvm_x86_ops.mem_enc_op)
--
2.33.0.rc1.237.g0d66db33f3-goog
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