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diff -ur tboot-1.8.2.orig/tboot/common/shutdown.S tboot-1.8.2/tboot/common/shutdown.S
--- tboot-1.8.2.orig/tboot/common/shutdown.S 2014-07-28 12:24:22.000000000 +0400
+++ tboot-1.8.2/tboot/common/shutdown.S 2015-05-07 03:05:47.300985413 +0400
@@ -34,6 +34,11 @@
*/
compat_mode_entry:
+ /* Disable PCID */
+ movl %cr4, %eax
+ andl $~CR4_PCIDE, %eax
+ movl %eax, %cr4
+
/* Disable paging and therefore leave 64 bit mode. */
movl %cr0, %eax
andl $~CR0_PG, %eax
diff -ur tboot-1.8.2.orig/tboot/include/processor.h tboot-1.8.2/tboot/include/processor.h
--- tboot-1.8.2.orig/tboot/include/processor.h 2014-07-28 12:24:22.000000000 +0400
+++ tboot-1.8.2/tboot/include/processor.h 2015-05-07 03:04:58.721244858 +0400
@@ -92,6 +92,7 @@
#define CR4_XMM 0x00000400 /* enable SIMD/MMX2 to use except 16 */
#define CR4_VMXE 0x00002000/* enable VMX */
#define CR4_SMXE 0x00004000/* enable SMX */
+#define CR4_PCIDE 0x00020000/* enable PCID */
#ifndef __ASSEMBLY__
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