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xen-devel
Re: [Xen-devel] xenheap pages mapped by dom0
Keir Fraser wrote:
I think the right thing to do would be very roughly:
On allocation:
page = alloc_xenheap_page();
share_xen_page_with_guest(page);
On deallocation:
if (test_and_clear(PGC_allocated)) put_page();
if (page->count_info & PGC_count_mask) return -EBUSY;
free_xenheap_page(page);
Hmm, the first two should probably happen in the opposite order, no?
I.e., we should check to see that for each page we want to deallocate,
page->count_info & PGC_count_mask == 0, returning -EBUSY if that fails;
then unmark allocate and call free xenheap page?
-George
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