Re: [Xen-devel] [RFC XEN PATCH v3 03/39] x86_64/mm: avoid cleaning the unmapped frame table

[Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx>]

On Mon, 2017-09-11 at 12:37 +0800, Haozhong Zhang wrote:
> cleanup_frame_table() initializes the entire newly added frame table
> to all -1's. If it's called after extend_frame_table() failed to map
> the entire frame table, the initialization will hit a page fault.
> 
> Move the cleanup of partially mapped frametable to
> extend_frame_table(),
> which has enough knowledge of the mapping status.

Overall the patch fixed the issue. But I guess you can achieve this with
less change. For example, you can use info->cur to pass the last mapped
pfn and only memset those mapped chuncks.

Chao

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel