From: Nicholas Piggin npiggin@gmail.com
[ 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 npiggin@gmail.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/20220926054305.2671436-3-npiggin@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/powerpc/kernel/setup_64.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 2b2d0b0fbb30..ce8fc6575eaa 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -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)