On 29.11.2017 17:41, Christoffer Dall wrote:
> In preparation for moving calls to vcpu_load() and vcpu_put() into the
> architecture specific implementations of the KVM vcpu ioctls, move the
> calls in the main kvm_vcpu_ioctl() dispatcher function to each case
> of the ioctl select statement. This allows us to move the vcpu_load()
> and vcpu_put() calls into architecture specific implementations of vcpu
> ioctls, one by one.
>
> Signed-off-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx>
> ---
> virt/kvm/kvm_main.c | 26 ++++++++++++++++++++++++--
> 1 file changed, 24 insertions(+), 2 deletions(-)
>
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 39961fb..480b16c 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -2525,13 +2525,13 @@ static long kvm_vcpu_ioctl(struct file *filp,
>
> if (mutex_lock_killable(&vcpu->mutex))
> return -EINTR;
> - vcpu_load(vcpu);
> switch (ioctl) {
> case KVM_RUN: {
> struct pid *oldpid;
> r = -EINVAL;
> if (arg)
> goto out;
> + vcpu_load(vcpu);
> oldpid = rcu_access_pointer(vcpu->pid);
> if (unlikely(oldpid != current->pids[PIDTYPE_PID].pid)) {
> /* The thread running this VCPU changed. */
> @@ -2543,6 +2543,7 @@ static long kvm_vcpu_ioctl(struct file *filp,
> put_pid(oldpid);
> }
> r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
> + vcpu_put(vcpu);
> trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
> break;
> }
> @@ -2553,7 +2554,9 @@ static long kvm_vcpu_ioctl(struct file *filp,
> kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
> if (!kvm_regs)
> goto out;
> + vcpu_load(vcpu);
> r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
> + vcpu_put(vcpu);
> if (r)
> goto out_free1;
> r = -EFAULT;
> @@ -2573,7 +2576,9 @@ static long kvm_vcpu_ioctl(struct file *filp,
> r = PTR_ERR(kvm_regs);
> goto out;
> }
> + vcpu_load(vcpu);
> r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
> + vcpu_put(vcpu);
> kfree(kvm_regs);
> break;
> }
> @@ -2582,7 +2587,9 @@ static long kvm_vcpu_ioctl(struct file *filp,
> r = -ENOMEM;
> if (!kvm_sregs)
> goto out;
> + vcpu_load(vcpu);
> r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
> + vcpu_put(vcpu);
> if (r)
> goto out;
> r = -EFAULT;
> @@ -2598,13 +2605,17 @@ static long kvm_vcpu_ioctl(struct file *filp,
> kvm_sregs = NULL;
> goto out;
> }
> + vcpu_load(vcpu);
> r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
> + vcpu_put(vcpu);
> break;
> }
> case KVM_GET_MP_STATE: {
> struct kvm_mp_state mp_state;
>
> + vcpu_load(vcpu);
> r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
> + vcpu_put(vcpu);
> if (r)
> goto out;
> r = -EFAULT;
> @@ -2619,7 +2630,9 @@ static long kvm_vcpu_ioctl(struct file *filp,
> r = -EFAULT;
> if (copy_from_user(&mp_state, argp, sizeof(mp_state)))
> goto out;
> + vcpu_load(vcpu);
> r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
> + vcpu_put(vcpu);
> break;
> }
> case KVM_TRANSLATE: {
> @@ -2628,7 +2641,9 @@ static long kvm_vcpu_ioctl(struct file *filp,
> r = -EFAULT;
> if (copy_from_user(&tr, argp, sizeof(tr)))
> goto out;
> + vcpu_load(vcpu);
> r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
> + vcpu_put(vcpu);
> if (r)
> goto out;
> r = -EFAULT;
> @@ -2643,7 +2658,9 @@ static long kvm_vcpu_ioctl(struct file *filp,
> r = -EFAULT;
> if (copy_from_user(&dbg, argp, sizeof(dbg)))
> goto out;
> + vcpu_load(vcpu);
> r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
> + vcpu_put(vcpu);
> break;
> }
> case KVM_SET_SIGNAL_MASK: {
> @@ -2674,7 +2691,9 @@ static long kvm_vcpu_ioctl(struct file *filp,
> r = -ENOMEM;
> if (!fpu)
> goto out;
> + vcpu_load(vcpu);
> r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
> + vcpu_put(vcpu);
> if (r)
> goto out;
> r = -EFAULT;
> @@ -2690,14 +2709,17 @@ static long kvm_vcpu_ioctl(struct file *filp,
> fpu = NULL;
> goto out;
> }
> + vcpu_load(vcpu);
> r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
> + vcpu_put(vcpu);
> break;
> }
> default:
> + vcpu_load(vcpu);
> r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
> + vcpu_put(vcpu);
> }
> out:
> - vcpu_put(vcpu);
> mutex_unlock(&vcpu->mutex);
> kfree(fpu);
> kfree(kvm_sregs);
>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
--
Thanks,
David / dhildenb
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