D13971.id38179.diff
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	Index: sys/amd64/amd64/machdep.c
	===================================================================
	--- sys/amd64/amd64/machdep.c
	+++ sys/amd64/amd64/machdep.c
	@@ -1618,6 +1618,7 @@
	mtx_init(&dt_lock, "descriptor tables", NULL, MTX_DEF);

	/* exceptions */
	+ pti = pti_get_default();
	TUNABLE_INT_FETCH("vm.pmap.pti", &pti);

	for (x = 0; x < NIDT; x++)
	Index: sys/x86/include/x86_var.h
	===================================================================
	--- sys/x86/include/x86_var.h
	+++ sys/x86/include/x86_var.h
	@@ -136,6 +136,7 @@
	void nmi_handle_intr(u_int type, struct trapframe *frame);
	void pagecopy(void from, void to);
	void printcpuinfo(void);
	+int pti_get_default(void);
	int user_dbreg_trap(void);
	int minidumpsys(struct dumperinfo *);
	struct pcb get_pcb_td(struct thread td);
	Index: sys/x86/x86/identcpu.c
	===================================================================
	--- sys/x86/x86/identcpu.c
	+++ sys/x86/x86/identcpu.c
	@@ -1662,6 +1662,16 @@
	#endif
	}

	+int
	+pti_get_default(void)
	+{
	+
	+ if (strcmp(cpu_vendor, AMD_VENDOR_ID) == 0)
	+ return (0);
	+
	+ return (1);
	+}
	+
	static u_int
	find_cpu_vendor_id(void)
	{