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x86/idt: Load idt early in start_secondary

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commit 55d2d0ad2f upstream.

On a secondary, idt is first loaded in cpu_init() with load_current_idt(),
i.e. no exceptions can be handled before that point.

The conversion of WARN() to use UD requires the IDT being loaded earlier as
any warning between start_secondary() and load_curren_idt() in cpu_init()
will result in an unhandled @UD exception and therefore fail the bringup of
the CPU.

Install the IDT handlers right in start_secondary() before calling cpu_init().

[ tglx: Massaged changelog ]

Fixes: 9a93848fe7 ("x86/debug: Implement __WARN() using UD0")
Signed-off-by: Chunyu Hu <chuhu@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: peterz@infradead.org
Cc: bp@alien8.de
Cc: rostedt@goodmis.org
Cc: luto@kernel.org
Link: https://lkml.kernel.org/r/1511792499-4073-1-git-send-email-chuhu@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunyu Hu
2017-11-27 22:21:39 +08:00
committed by Greg Kroah-Hartman
parent 70feeaaabf
commit e7bb5cf984
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/smpboot.c
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@@ -239,7 +239,7 @@ static void notrace start_secondary(void *unused)
load_cr3(swapper_pg_dir); load_cr3(swapper_pg_dir);
__flush_tlb_all(); __flush_tlb_all();
#endif #endif
load_current_idt();
cpu_init(); cpu_init();
x86_cpuinit.early_percpu_clock_init(); x86_cpuinit.early_percpu_clock_init();
preempt_disable(); preempt_disable();