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- Make pmap_write_protect() work with pmap_kernel() too ((va & L2_FRAME)

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strips the high bits of a LP64 address)
- use pmap_protect() in pmap_pdp_ctor() to remap the PDP read-only instead
  of (ab)using pmap_kenter_pa(). No more "mapping already present" on
  console with DIAGNOSTIC kernels
- make sure to zero the whole PDP (NTOPLEVEL_PDES doens't include
  high-level entries on i386 and i386PAE, reserved by Xen). Not sure
  how it has worked before
- remove an always-true test (&& pmap != pmap_kernel(); we KASSERT that
  at the function entry).
This commit is contained in:
bouyer 2012-02-20 20:49:12 +00:00
parent 83cc5b2226
commit 3654664ee4
1 changed files with 10 additions and 10 deletions
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20
sys/arch/x86/x86/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.165 2012/02/17 18:40:19 bouyer Exp $ */
/* $NetBSD: pmap.c,v 1.166 2012/02/20 20:49:12 bouyer Exp $ */
/*-
* Copyright (c) 2008, 2010 The NetBSD Foundation, Inc.
@ -171,7 +171,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.165 2012/02/17 18:40:19 bouyer Exp $");
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.166 2012/02/20 20:49:12 bouyer Exp $");
#include "opt_user_ldt.h"
#include "opt_lockdebug.h"
@ -1979,7 +1979,7 @@ pmap_get_ptp(struct pmap *pmap, vaddr_t va, pd_entry_t * const *pdes)
pmap_pte_set(&pva[index], (pd_entry_t)
(pmap_pa2pte(pa) | PG_u | PG_RW | PG_V));
#if defined(XEN) && defined(__x86_64__)
if(i == PTP_LEVELS && pmap != pmap_kernel()) {
if(i == PTP_LEVELS) {
/*
* Update the per-cpu PD on all cpus the current
* pmap is active on
@ -2090,8 +2090,8 @@ pmap_pdp_ctor(void *arg, void *v, int flags)
npde * sizeof(pd_entry_t));
/* zero the rest */
memset(&pdir[PDIR_SLOT_KERN + npde], 0,
(NTOPLEVEL_PDES - (PDIR_SLOT_KERN + npde)) * sizeof(pd_entry_t));
memset(&pdir[PDIR_SLOT_KERN + npde], 0, (PAGE_SIZE * PDP_SIZE) -
(PDIR_SLOT_KERN + npde) * sizeof(pd_entry_t));
if (VM_MIN_KERNEL_ADDRESS != KERNBASE) {
int idx = pl_i(KERNBASE, PTP_LEVELS);
@ -2107,11 +2107,10 @@ pmap_pdp_ctor(void *arg, void *v, int flags)
#ifdef XEN
s = splvm();
object = (vaddr_t)v;
pmap_protect(pmap_kernel(), object, object + (PAGE_SIZE * PDP_SIZE),
VM_PROT_READ);
pmap_update(pmap_kernel());
for (i = 0; i < PDP_SIZE; i++, object += PAGE_SIZE) {
(void) pmap_extract(pmap_kernel(), object, &pdirpa);
/* FIXME: This should use pmap_protect() .. */
pmap_kenter_pa(object, pdirpa, VM_PROT_READ, 0);
pmap_update(pmap_kernel());
/*
* pin as L2/L4 page, we have to do the page with the
* PDIR_SLOT_PTE entries last
@ -2121,6 +2120,7 @@ pmap_pdp_ctor(void *arg, void *v, int flags)
continue;
#endif
(void) pmap_extract(pmap_kernel(), object, &pdirpa);
#ifdef __x86_64__
xpq_queue_pin_l4_table(xpmap_ptom_masked(pdirpa));
#else
@ -3779,7 +3779,7 @@ pmap_write_protect(struct pmap *pmap, vaddr_t sva, vaddr_t eva, vm_prot_t prot)
pt_entry_t *spte, *epte;
int i;
blockend = (va & L2_FRAME) + NBPD_L2;
blockend = x86_round_pdr(va + 1);
if (blockend > eva)
blockend = eva;