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In the pmap_set_pg() function, which enables the global bit on the

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ptes mapping the kernel on CPUs where global TLB entries are
supported, revert to flushing only non-global entries, i.e. to the
pre-r291688 state.  There is no need to flush global TLB entries,
since only global entries created during the previous iterations of
the loop could exist at this moment.

Submitted by:	alc
Differential revision:	https://reviews.freebsd.org/D4368
This commit is contained in:
Konstantin Belousov 2015-12-05 08:46:41 +00:00
parent 4d982a2562
commit 1ac627629b
1 changed files with 2 additions and 2 deletions
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4
sys/i386/i386/pmap.c
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@ -655,7 +655,7 @@ pmap_set_pg(void)
va = KERNBASE + KERNLOAD;
while (va < endva) {
pdir_pde(PTD, va) |= pgeflag;
invltlb_glob(); /* Play it safe, invltlb() every time */
invltlb(); /* Flush non-PG_G entries. */
va += NBPDR;
}
} else {
@ -664,7 +664,7 @@ pmap_set_pg(void)
pte = vtopte(va);
if (*pte)
*pte |= pgeflag;
invltlb_glob(); /* Play it safe, invltlb() every time */
invltlb(); /* Flush non-PG_G entries. */
va += PAGE_SIZE;
}
}