bd101a6648
operation after processor is configured to allow all required features. In particular, NX must be enabled in EFER, otherwise load of page table element with nx bit set causes reserved bit page fault. Since malloc uses direct mapping for small allocations, in particular for the suspension pcbs, and DMAP is nx after r316767, this commit tripped fault on resume path. Restore complete state of EFER while wakeup code is still executing with custom page table, before calling resumectx, instead of trying to guess which features might be needed before resumectx restored EFER on its own. Bisected and tested by: trasz Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
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