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From: huang ying on 16 Jun 2010 07:00
On Tue, Jun 15, 2010 at 7:22 PM, Avi Kivity <avi(a)redhat.com> wrote:
> btw, is_hwpoison_address() is racy. While it looks up the address, some
> other task can unmap the page tables under us.
> One way of fixing it is get_user_pages_ptes_fast(), which also returns the
> pte, also atomically. I want it for other reasons as well (respond to a
> read fault by gupping the page for read, but allowing write access if the
> pte indicates it is writeable).
Yes. is_hwpoison_address() is racy. But I think it is not absolutely
necessary to call is_hwpoison_address() in hva_to_pfn_atomic(), is it?
For is_hwpoison_address() in hva_to_pfn(), we can protect it with mmap_sem.
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