[tip:x86/urgent] x86/idt: Initialize early IDT before cr4_init_shadow()

[tip-bot for Thomas Gleixner <tipbot@zytor.com>]

Commit-ID:  9c48c0965b97e14ddcf75490a754e84e05aaa062
Gitweb:     https://git.kernel.org/tip/9c48c0965b97e14ddcf75490a754e84e05aaa062
Author:     Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Mon, 16 Oct 2017 12:12:16 +0200
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Mon, 16 Oct 2017 20:47:37 +0200

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: 87e81786b13b ("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

---
 arch/x86/kernel/head32.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/head32.c b/arch/x86/kernel/head32.c
index cf2ce06..2902ca4 100644
--- a/arch/x86/kernel/head32.c
+++ b/arch/x86/kernel/head32.c
@@ -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();