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While the page table walker correctly generates a guest page fault
if a guest tries to execute a non-executable page, the shadow code does
not mark it non-executable. This means that if a guest accesses an nx
page first with a read access, then subsequent code fetch accesses will
succeed.
Fix by setting the nx bit on shadow ptes.
Signed-off-by: Avi Kivity <avi@qumranet.com>
8d87a03aea