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RE: [Xen-devel] Sources of page dirtying for HVM domains in Xen 3.2.x

> But I've noticed that the paging_mark_dirty() is also called from
> other places that do not originate from the page fault handler.  This
> makes sense to me for PV translated domains as other Xen functions may
> modify guest pages.  But for HVM domains, are there other sources of
> guest memory modification that will not originate from page faults?

Qemu-dm emulated DMA, PV driver DMA.

Within page fault handling you've also got to consider the special cases
of MMIO, PTE accessed/dirty bit update.


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