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| author | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2020-01-28 10:31:26 -0500 |
|---|---|---|
| committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2020-01-28 12:22:48 -0600 |
| commit | 9293724192a73f49c722e9685d45649c6df67dfe (patch) | |
| tree | eedc228247491ab7cfc18143003803181475f5e6 /drivers/xen | |
| parent | eda4eabf86fd6806eaabc23fb90dd056fdac037b (diff) | |
| download | linux-9293724192a73f49c722e9685d45649c6df67dfe.tar.bz2 | |
xen/gntdev: Do not use mm notifiers with autotranslating guests
Commit d3eeb1d77c5d ("xen/gntdev: use mmu_interval_notifier_insert")
missed a test for use_ptemod when calling mmu_interval_read_begin(). Fix
that.
Fixes: d3eeb1d77c5d ("xen/gntdev: use mmu_interval_notifier_insert")
CC: stable@vger.kernel.org # 5.5
Reported-by: Ilpo Järvinen <ilpo.jarvinen@cs.helsinki.fi>
Tested-by: Ilpo Järvinen <ilpo.jarvinen@cs.helsinki.fi>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/gntdev.c | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index 4fc83e3f5ad3..0258415ca0b2 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -1006,19 +1006,19 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma) } mutex_unlock(&priv->lock); - /* - * gntdev takes the address of the PTE in find_grant_ptes() and passes - * it to the hypervisor in gntdev_map_grant_pages(). The purpose of - * the notifier is to prevent the hypervisor pointer to the PTE from - * going stale. - * - * Since this vma's mappings can't be touched without the mmap_sem, - * and we are holding it now, there is no need for the notifier_range - * locking pattern. - */ - mmu_interval_read_begin(&map->notifier); - if (use_ptemod) { + /* + * gntdev takes the address of the PTE in find_grant_ptes() and + * passes it to the hypervisor in gntdev_map_grant_pages(). The + * purpose of the notifier is to prevent the hypervisor pointer + * to the PTE from going stale. + * + * Since this vma's mappings can't be touched without the + * mmap_sem, and we are holding it now, there is no need for + * the notifier_range locking pattern. + */ + mmu_interval_read_begin(&map->notifier); + map->pages_vm_start = vma->vm_start; err = apply_to_page_range(vma->vm_mm, vma->vm_start, vma->vm_end - vma->vm_start, |