diff mbox series

[v3,2/7] powerpc/64: mark irqs hard disabled in boot paca

Message ID 20220926054305.2671436-3-npiggin@gmail.com (mailing list archive)
State Accepted
Headers show
Series powerpc/64: interrupt soft-mask and context fixes | expand

Commit Message

Nicholas Piggin Sept. 26, 2022, 5:43 a.m. UTC
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>
---
 arch/powerpc/kernel/setup_64.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

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)