svn commit: r337792 - stable/11/sys/amd64/amd64

[Konstantin Belousov]

Author: kib
Date: Tue Aug 14 17:48:28 2018
New Revision: 337792
URL: https://svnweb.freebsd.org/changeset/base/337792

Log:
  MFC r337774:
  Reserve page at the physical address zero on amd64.
  
  Approved by:	so (insta-MFC)

Modified:
  stable/11/sys/amd64/amd64/pmap.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/amd64/amd64/pmap.c
==============================================================================
--- stable/11/sys/amd64/amd64/pmap.c	Tue Aug 14 17:48:02 2018	(r337791)
+++ stable/11/sys/amd64/amd64/pmap.c	Tue Aug 14 17:48:28 2018	(r337792)
@@ -1220,6 +1220,9 @@ pmap_init(void)
 	vm_size_t s;
 	int error, i, pv_npg, ret, skz63;
 
+	/* L1TF, reserve page @0 unconditionally */
+	vm_page_blacklist_add(0, bootverbose);
+
 	/* Detect bare-metal Skylake Server and Skylake-X. */
 	if (vm_guest == VM_GUEST_NO && cpu_vendor_id == CPU_VENDOR_INTEL &&
 	    CPUID_TO_FAMILY(cpu_id) == 0x6 && CPUID_TO_MODEL(cpu_id) == 0x55) {