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powerpc/64: mark irqs hard disabled in boot paca 

This prevents interrupts in early boot (e.g., program check) from
enabling MSR[EE], potentially causing endian mismatch or other
crashes when reporting early boot traps.

Fixes: 4423eb5ae3 ("powerpc/64/interrupt: make normal synchronous interrupts enable MSR[EE] if possible")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220926054305.2671436-3-npiggin@gmail.com
pull/520/merge
Nicholas Piggin 2022-09-26 15:43:00 +10:00 committed by Michael Ellerman
parent 56adbb7a8b
commit 799f7063c7
1 changed files with 3 additions and 1 deletions
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4
arch/powerpc/kernel/setup_64.c
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@ -182,8 +182,10 @@ static void __init fixup_boot_paca(void)
get_paca()->cpu_start = 1;
/* Allow percpu accesses to work until we setup percpu data */
get_paca()->data_offset = 0;
/* Mark interrupts disabled in PACA */
/* Mark interrupts soft and hard disabled in PACA */
irq_soft_mask_set(IRQS_DISABLED);
get_paca()->irq_happened = PACA_IRQ_HARD_DIS;
WARN_ON(mfmsr() & MSR_EE);
}
static void __init configure_exceptions(void)