On 11/10/2010 06:42 PM, Andi Kleen wrote:
> We need host kernel to break down the 2M huge page into 4k pages. Then > send SIGBUS to QEMU with the poisoned 4k page. Because host kernel will > poison the whole 2M virtual address space otherwise, and other 4k pages > inside the 2M page can not used accessed in guest (will trigger SIGBUS > and SRAR MCE). The easiest way would be to port the respective code from Andrea's transparent hugetlb patchkit. It already does break down huge pages as needed. You just have to be careful to not touch (/copy) the corrupted subpage.
Doing it in userspace in easier, since we can replace the vma for that section (and avoid mixed 4k/2M pages in hugetlbfs).
With transparent hugepages it's easy of course, you just call split_hugepage() and poison the 4k page.
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