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Pre-map file mappings from /dev/shm (--mpol-shm-premap mcexec argument)

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This commit is contained in:
Balazs Gerofi
2017-03-12 14:34:34 +09:00
parent c5079898c2
commit 9b5ccb5a33
8 changed files with 157 additions and 7 deletions
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14
arch/x86/kernel/memory.c
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@ -1075,7 +1075,7 @@ int visit_pte_range(page_table_t pt, void *start0, void *end0, int pgshift,
struct clear_range_args {
int free_physical;
uint8_t padding[4];
int dont_walk_l1;
struct memobj *memobj;
struct process_vm *vm;
};
@ -1167,9 +1167,11 @@ static int clear_range_l2(void *args0, pte_t *ptep, uint64_t base,
}
pt = phys_to_virt(*ptep & PT_PHYSMASK);
error = walk_pte_l1(pt, base, start, end, &clear_range_l1, args0);
if (error && (error != -ENOENT)) {
return error;
if (!args->dont_walk_l1) {
error = walk_pte_l1(pt, base, start, end, &clear_range_l1, args0);
if (error && (error != -ENOENT)) {
return error;
}
}
if ((start <= base) && ((base + PTL2_SIZE) <= end)) {
@ -1279,6 +1281,10 @@ static int clear_range(struct page_table *pt, struct process_vm *vm,
if (memobj && (memobj->flags & MF_DEV_FILE)) {
args.free_physical = 0;
}
args.dont_walk_l1 = 0;
if (memobj && ((memobj->flags & MF_PREMAP))) {
args.dont_walk_l1 = 1;
}
args.memobj = memobj;
args.vm = vm;