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Linear Address Masking mode for userspace pointers encoded in CR3 bits.
The mode is selected per-process and stored in mm_context_t.
switch_mm_irqs_off() now respects selected LAM mode and constructs CR3
accordingly.
The active LAM mode gets recorded in the tlb_state.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Alexander Potapenko <glider@google.com>
Link: https://lore.kernel.org/all/20230312112612.31869-5-kirill.shutemov%40linux.intel.com
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