amd64: Set MSR_KGSBASE to 0 during AP startup

There is no reason to initialize it to anything else, and this matches
initialization of the BSP.  No functional change intended.

Reviewed by:	kib
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D31336

This commit is contained in:

Mark Johnston

2021-07-29 10:14:05 -04:00

parent 9e575fadf4

commit e153745083

1 changed files with 2 additions and 2 deletions

									
										sys/amd64/amd64/mp_machdep.c
									
		+2
		-2
	
												View File
												
				@@ -262,8 +262,8 @@ init_secondary(void)

					lgdt(&ap_gdt);			/* does magic intra-segment return */

					wrmsr(MSR_FSBASE, 0);		/* User value */

					wrmsr(MSR_GSBASE, (u_int64_t)pc);

					wrmsr(MSR_KGSBASE, (u_int64_t)pc);	/* XXX User value while we're in the kernel */

					wrmsr(MSR_GSBASE, (uint64_t)pc);

					wrmsr(MSR_KGSBASE, 0);		/* User value */

					fix_cpuid();

					lidt(&r_idt);