Author: kib
Date: Thu Apr 13 15:49:55 2017
New Revision: 316767
URL: https://svnweb.freebsd.org/changeset/base/316767
Log:
Map DMAP as nx.
Demotions preserve PG_NX, so it is enough to set nx bit for initial
lowest-level paging entries.
Suggested and reviewed by: alc
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Modified:
head/sys/amd64/amd64/pmap.c
Modified: head/sys/amd64/amd64/pmap.c
==============================================================================
--- head/sys/amd64/amd64/pmap.c Thu Apr 13 15:49:32 2017 (r316766)
+++ head/sys/amd64/amd64/pmap.c Thu Apr 13 15:49:55 2017 (r316767)
@@ -933,14 +933,14 @@ create_pagetables(vm_paddr_t *firstaddr)
pd_p[j] = (vm_paddr_t)i << PDRSHIFT;
/* Preset PG_M and PG_A because demotion expects it. */
pd_p[j] |= X86_PG_RW | X86_PG_V | PG_PS | X86_PG_G |
- X86_PG_M | X86_PG_A;
+ X86_PG_M | X86_PG_A | pg_nx;
}
pdp_p = (pdp_entry_t *)DMPDPphys;
for (i = 0; i < ndm1g; i++) {
pdp_p[i] = (vm_paddr_t)i << PDPSHIFT;
/* Preset PG_M and PG_A because demotion expects it. */
pdp_p[i] |= X86_PG_RW | X86_PG_V | PG_PS | X86_PG_G |
- X86_PG_M | X86_PG_A;
+ X86_PG_M | X86_PG_A | pg_nx;
}
for (j = 0; i < ndmpdp; i++, j++) {
pdp_p[i] = DMPDphys + ptoa(j);
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