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Commit e0e0d6b7 authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
Browse files

powerpc/64: Replay hypervisor maintenance interrupt first 



The HMI (Hypervisor Maintenance Interrupt) is defined by the
architecture to be higher priority than other maskable interrupts, so
replay it first, as a best-effort to replay according to hardware
priorities.

Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 7de3b27b

arch/powerpc/kernel/irq.c

+9 −5
Original line number Diff line number Diff line
@@ -156,6 +156,15 @@ notrace unsigned int __check_irq_replay(void) 
		lv1_get_version_info(&tmp, &tmp2);

	}



	/*

	 * Check if an hypervisor Maintenance interrupt happened.

	 * This is a higher priority interrupt than the others, so

	 * replay it first.

	 */

	local_paca->irq_happened &= ~PACA_IRQ_HMI;

	if (happened & PACA_IRQ_HMI)

		return 0xe60;



	/*

	 * We may have missed a decrementer interrupt. We check the

	 * decrementer itself rather than the paca irq_happened field
@@ -191,11 +200,6 @@ notrace unsigned int __check_irq_replay(void) 
	}

#endif /* CONFIG_PPC_BOOK3E */



	/* Check if an hypervisor Maintenance interrupt happened */

	local_paca->irq_happened &= ~PACA_IRQ_HMI;

	if (happened & PACA_IRQ_HMI)

		return 0xe60;



	/* There should be nothing left ! */

	BUG_ON(local_paca->irq_happened != 0);