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Batch the TLB invalidations that are performed by pmap_protect() rather

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than performing them one at a time.

MFC after:	10 days
This commit is contained in:
Alan Cox 2019-06-14 22:06:43 +00:00
parent 5993fa5582
commit 26066aef10
1 changed files with 10 additions and 3 deletions
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13
sys/arm64/arm64/pmap.c
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@ -2791,8 +2791,15 @@ pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
for (l3p = pmap_l2_to_l3(l2, sva); sva != va_next; l3p++,
sva += L3_SIZE) {
l3 = pmap_load(l3p);
if (!pmap_l3_valid(l3))
if (!pmap_l3_valid(l3)) {
if (va != va_next) {
pmap_invalidate_range(pmap, va, sva);
va = va_next;
}
continue;
}
if (va == va_next)
va = sva;
nbits = 0;
if ((prot & VM_PROT_WRITE) == 0) {
@ -2807,9 +2814,9 @@ pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
nbits |= ATTR_XN;
pmap_set(l3p, nbits);
/* XXX: Use pmap_invalidate_range */
pmap_invalidate_page(pmap, sva);
}
if (va != va_next)
pmap_invalidate_range(pmap, va, sva);
}
PMAP_UNLOCK(pmap);
}