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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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050eef364a
The tlb flushing code uses the mm_users field of the mm_struct to decide if each page table entry needs to be flushed individually with IPTE or if a global flush for the mm_struct is sufficient after all page table updates have been done. The comment for mm_users says "How many users with user space?" but the /proc code increases mm_users after it found the process structure by pid without creating a new user process. Which makes mm_users useless for the decision between the two tlb flusing methods. The current code can be confused to not flush tlb entries by a concurrent access to /proc files if e.g. a fork is in progres. The solution for this problem is to make the tlb flushing logic independent from the mm_users field. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
24 lines
691 B
C
24 lines
691 B
C
#ifndef __MMU_H
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#define __MMU_H
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typedef struct {
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atomic_t attach_count;
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unsigned int flush_mm;
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spinlock_t list_lock;
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struct list_head crst_list;
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struct list_head pgtable_list;
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unsigned long asce_bits;
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unsigned long asce_limit;
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unsigned long vdso_base;
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int noexec;
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int has_pgste; /* The mmu context has extended page tables */
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int alloc_pgste; /* cloned contexts will have extended page tables */
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} mm_context_t;
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#define INIT_MM_CONTEXT(name) \
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.context.list_lock = __SPIN_LOCK_UNLOCKED(name.context.list_lock), \
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.context.crst_list = LIST_HEAD_INIT(name.context.crst_list), \
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.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list),
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#endif
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