Re: [Xen-devel] [PATCH][PVFB][LINUX] Fix possible sleep while holding spinlock

[Keir Fraser <keir@xxxxxxxxxxxxx>]

On 15/12/06 16:38, "Markus Armbruster" <armbru@xxxxxxxxxx> wrote:

> This patch fixes the locking, but leaves open a race between
> xenfb_update_screen() and do_no_page().  See the source code for a
> detailed explanation of how it works, and where it fails.

That's a bit of a shame. Is there any way we could use do_file_page() and
have a populate hook (which gets to install the PTE itself)? Or are there
lots of assumptions about VMAs that would take this path, assert
VM_NONLINEAR, etc?

 -- Keir


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