On Mon, 3 Feb 2020 08:19:31 -0500
Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote:
> Before we destroy the secure configuration, we better make all
> pages accessible again. This also happens during reboot, where we reboot
> into a non-secure guest that then can go again into a secure mode. As
s/a secure/secure/
> this "new" secure guest will have a new ID we cannot reuse the old page
> state.
>
> Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> ---
> arch/s390/include/asm/pgtable.h | 1 +
> arch/s390/kvm/pv.c | 2 ++
> arch/s390/mm/gmap.c | 35 +++++++++++++++++++++++++++++++++
> 3 files changed, 38 insertions(+)
(...)
> +void s390_reset_acc(struct mm_struct *mm)
> +{
> + /*
> + * we might be called during
> + * reset: we walk the pages and clear
> + * close of all kvm file descriptor: we walk the pages and clear
s/descriptor/descriptors/
> + * exit of process on fd closure: vma already gone, do nothing
> + */
> + if (!mmget_not_zero(mm))
> + return;
> + down_read(&mm->mmap_sem);
> + walk_page_range(mm, 0, TASK_SIZE, &reset_acc_walk_ops, NULL);
> + up_read(&mm->mmap_sem);
> + mmput(mm);
> +}
> +EXPORT_SYMBOL_GPL(s390_reset_acc);
Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
