x86/mm: Handle LAM on context switch

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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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Kirill A. Shutemov 2023-03-12 14:25:59 +03:00 • committed by Dave Hansen

parent 6449dcb0ca

commit 82721d8b25

4 changed files with 103 additions and 17 deletions

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5

arch/x86/include/asm/mmu.h

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24

arch/x86/include/asm/mmu_context.h

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38

arch/x86/include/asm/tlbflush.h

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53

arch/x86/mm/tlb.c

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