Date: Thu, 13 Apr 2017 15:49:55 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r316767 - head/sys/amd64/amd64 Message-ID: <201704131549.v3DFnt9I004050@repo.freebsd.org>
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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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