Re: [Xen-devel] Linux 5.5 fails to boot in VM

["Ilpo Järvinen" <ilpo.jarvinen@xxxxxxxxxxxxxx>]

On Mon, 27 Jan 2020, Boris Ostrovsky wrote:

> RAX=0 most likely means that map->notifier is NULL (assuming your
> compiler generates code similar to mine).
> 
> I believe you at least need
> 
> 
> diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
> index 4fc83e3f..d35cf0b 100644
> --- a/drivers/xen/gntdev.c
> +++ b/drivers/xen/gntdev.c
> @@ -1016,7 +1016,8 @@ static int gntdev_mmap(struct file *flip, struct
> vm_area_struct *vma)
>          * 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)
> +               mmu_interval_read_begin(&map->notifier);
>  
>         if (use_ptemod) {
>                 map->pages_vm_start = vma->vm_start;
> 
> 
> and maybe more.  Give that a try.

This one works, thank you!

Please let me know if you still want me to test also the revert.


-- 
 i.

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