Re: [Xen-devel] Re: dom0 pvops crash apparently due to guest migration

[Keir Fraser <keir@xxxxxxx>]

On 29/11/2010 18:53, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx> wrote:

> Hm, I'm still not really sure why alloc_vm_area() does a
> vmalloc_sync_all in the first place...  But that BUG shouldn't happen
> regardless.

I think vmalloc_sync_all() is required only if alloc_vm_area()'d regions are
used as hypercall buffers. I'm not sure if they ever are, these days. The
sync wouldn't be needed for allocated regions use as shared rings, for
example. You might be able to do a quick audit of users and then remove the
vmalloc_sync_all(). Presumably if v_s_a is planned to go away it'd be nice
to get rid of this usage for that reason also.

 -- Keir




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