svn commit: r327764 - stable/11/sys/x86/x86

[Konstantin Belousov]

Author: kib
Date: Wed Jan 10 08:10:18 2018
New Revision: 327764
URL: https://svnweb.freebsd.org/changeset/base/327764

Log:
  MFC r327517:
  Use the new SDM-approved way to serialize x2APIC MSR writes.

Modified:
  stable/11/sys/x86/x86/local_apic.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/x86/x86/local_apic.c
==============================================================================
--- stable/11/sys/x86/x86/local_apic.c	Wed Jan 10 06:30:59 2018	(r327763)
+++ stable/11/sys/x86/x86/local_apic.c	Wed Jan 10 08:10:18 2018	(r327764)
@@ -211,6 +211,7 @@ lapic_write32(enum LAPIC_REGISTERS reg, uint32_t val)
 
 	if (x2apic_mode) {
 		mfence();
+		lfence();
 		wrmsr(MSR_APIC_000 + reg, val);
 	} else {
 		*(volatile uint32_t *)(lapic_map + reg * LAPIC_MEM_MUL) = val;