From: Nicholas Piggin Date: Mon, 26 Sep 2022 05:43:00 +0000 (+1000) Subject: powerpc/64: mark irqs hard disabled in boot paca X-Git-Tag: v5.19.17~215 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5e3186b70002ce5570e3fff99f7ed059317a9183;p=thirdparty%2Fkernel%2Fstable.git powerpc/64: mark irqs hard disabled in boot paca [ Upstream commit 799f7063c7645f9a751d17f5dfd73b952f962cd2 ] 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: 4423eb5ae32ec ("powerpc/64/interrupt: make normal synchronous interrupts enable MSR[EE] if possible") Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220926054305.2671436-3-npiggin@gmail.com Signed-off-by: Sasha Levin --- diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 5761f08dae958..6562517bcb3b7 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -183,8 +183,10 @@ 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)