Commit ffb60175 authored Feb 13, 2007 by Zachary Amsden Committed by Andi Kleen Feb 13, 2007

[PATCH] x86-64: x86_64 - Fix FS/GS registers for VT execution

Initialize FS and GS to __KERNEL_DS as well. The actual value of them is not
important, but it is important to reload them in protected mode. At this time,
they still retain the real mode values from initial boot. VT disallows
execution of code under such conditions, which means hardware virtualization
can not be used to boot the kernel on Intel platforms, making the boot time
painfully slow.

This requires moving the GS load before the load of GS_BASE, so just move
all the segments loads there to keep them together in the code.

Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Andi Kleen <ak@suse.de>

parent 9a11ff68

arch/x86_64/kernel/head.S

+14 −6

Original line number	Diff line number	Diff line
		@@ -163,6 +163,20 @@ startup_64:
		*/
		lgdt cpu_gdt_descr

		/* set up data segments. actually 0 would do too */
		movl $__KERNEL_DS,%eax
		movl %eax,%ds
		movl %eax,%ss
		movl %eax,%es

		/*
		* We don't really need to load %fs or %gs, but load them anyway
		* to kill any stale realmode selectors. This allows execution
		* under VT hardware.
		*/
		movl %eax,%fs
		movl %eax,%gs

		/*
		* Setup up a dummy PDA. this is just for some early bootup code
		* that does in_interrupt()
		@@ -173,12 +187,6 @@ startup_64:
		shrq $32,%rdx
		wrmsr

		/* set up data segments. actually 0 would do too */
		movl $__KERNEL_DS,%eax
		movl %eax,%ds
		movl %eax,%ss
		movl %eax,%es

		/* esi is pointer to real mode structure with interesting info.
		pass it to C */
		movl %esi, %edi

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