698cc19d6b
Use xen_update_descriptor to update the LDT rather than bcopy. Under Xen, pages used for holding LDTs must be read-only, so we can't make the change ourselves. Ths obvious alternative of "remap the page read-write, make the change, then map it read-only again" doesn't work since Xen won't allow an LDT page to be remapped as R/W. An arguably better solution is used by NetBSD: They don't modify LDTs in-place at all, but instead copy the entire LDT, modify the new version, then atomically swap. MFC after: 3 days |
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