Commit 9c48c096 authored Oct 16, 2017 by Thomas Gleixner

x86/idt: Initialize early IDT before cr4_init_shadow()



Moving the early IDT setup out of assembly code breaks the boot on first
generation 486 systems.

The reason is that the call of idt_setup_early_handler, which sets up the
early handlers was added after the call to cr4_init_shadow().

cr4_init_shadow() tries to read CR4 which is not available on those
systems. The accessor function uses a extable fixup to handle the resulting
fault. As the IDT is not set up yet, the cr4 read exception causes an
instantaneous reboot for obvious reasons.

Call idt_setup_early_handler() before cr4_init_shadow() so IDT is set up
before the first exception hits.

Fixes: 87e81786 ("x86/idt: Move early IDT setup out of 32-bit asm")
Reported-and-tested-by: Matthew Whitehead <whiteheadm@acm.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/alpine.DEB.2.20.1710161210290.1973@nanos

parent e6fc454b

arch/x86/kernel/head32.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -30,10 +30,11 @@ static void __init i386_default_early_setup(void)

		asmlinkage __visible void __init i386_start_kernel(void)
		{
		cr4_init_shadow();

		/* Make sure IDT is set up before any exception happens */
		idt_setup_early_handler();

		cr4_init_shadow();

		sanitize_boot_params(&boot_params);

		x86_early_init_platform_quirks();