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29 enabled by setting CONFIG_PAGE_TABLE_ISOLATION=y at compile time.
30 Once enabled at compile-time, it can be disabled at boot with the
57 This sharing at the PGD level also inherently shares all the lower
66 this protection comes at a cost:
80      must be done at interrupt, syscall, and exception entry
83      cycles, and are required at every entry and exit.
88      that stacks must be switched at entry time.
98      are changed.  This makes switching the page tables (at context
109      and one for the entry/exit structures.  At fork(), we need to
131 2. Allow PTI to be enabled/disabled at runtime in addition to the
171  * Crashes at the first interrupt.  Caused by bugs in entry_64.S,
174  * Crashes at the first NMI.  The NMI code is separate from main
180  * Kernel crashes at the first exit to userspace.  entry_64.S
182  * Crashes at first interrupt that interrupts userspace. The paths