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2f8794bd08
Add a few of arch_prctl() handles: - ARCH_ENABLE_TAGGED_ADDR enabled LAM. The argument is required number of tag bits. It is rounded up to the nearest LAM mode that can provide it. For now only LAM_U57 is supported, with 6 tag bits. - ARCH_GET_UNTAG_MASK returns untag mask. It can indicates where tag bits located in the address. - ARCH_GET_MAX_TAG_BITS returns the maximum tag bits user can request. Zero if LAM is not supported. 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/20230312112612.31869-9-kirill.shutemov%40linux.intel.com
80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_MMU_H
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#define _ASM_X86_MMU_H
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#include <linux/spinlock.h>
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#include <linux/rwsem.h>
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#include <linux/mutex.h>
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#include <linux/atomic.h>
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#include <linux/bits.h>
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/* Uprobes on this MM assume 32-bit code */
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#define MM_CONTEXT_UPROBE_IA32 0
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/* vsyscall page is accessible on this MM */
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#define MM_CONTEXT_HAS_VSYSCALL 1
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/* Do not allow changing LAM mode */
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#define MM_CONTEXT_LOCK_LAM 2
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/*
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* x86 has arch-specific MMU state beyond what lives in mm_struct.
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*/
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typedef struct {
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/*
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* ctx_id uniquely identifies this mm_struct. A ctx_id will never
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* be reused, and zero is not a valid ctx_id.
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*/
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u64 ctx_id;
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/*
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* Any code that needs to do any sort of TLB flushing for this
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* mm will first make its changes to the page tables, then
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* increment tlb_gen, then flush. This lets the low-level
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* flushing code keep track of what needs flushing.
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*
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* This is not used on Xen PV.
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*/
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atomic64_t tlb_gen;
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#ifdef CONFIG_MODIFY_LDT_SYSCALL
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struct rw_semaphore ldt_usr_sem;
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struct ldt_struct *ldt;
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#endif
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#ifdef CONFIG_X86_64
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unsigned long flags;
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#endif
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#ifdef CONFIG_ADDRESS_MASKING
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/* Active LAM mode: X86_CR3_LAM_U48 or X86_CR3_LAM_U57 or 0 (disabled) */
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unsigned long lam_cr3_mask;
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/* Significant bits of the virtual address. Excludes tag bits. */
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u64 untag_mask;
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#endif
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struct mutex lock;
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void __user *vdso; /* vdso base address */
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const struct vdso_image *vdso_image; /* vdso image in use */
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atomic_t perf_rdpmc_allowed; /* nonzero if rdpmc is allowed */
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#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
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/*
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* One bit per protection key says whether userspace can
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* use it or not. protected by mmap_lock.
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*/
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u16 pkey_allocation_map;
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s16 execute_only_pkey;
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#endif
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} mm_context_t;
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#define INIT_MM_CONTEXT(mm) \
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.context = { \
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.ctx_id = 1, \
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.lock = __MUTEX_INITIALIZER(mm.context.lock), \
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}
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void leave_mm(int cpu);
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#define leave_mm leave_mm
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#endif /* _ASM_X86_MMU_H */
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