Commit c07e1b8a authored May 01, 2017 by Nicholas Piggin Committed by Michael Ellerman May 30, 2017

powerpc/64s: Fix OPAL_CALL non-maskable interrupt reentrancy



OPAL_CALL uses SRR[01] with MSR_RI=1, which gets corrupted if there
is an interleaving system reset or machine check interrupt.

Use HSRR[01] instead, which does not require MSR_RI=0.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

parent f1fe5252

arch/powerpc/platforms/powernv/opal-wrappers.S

+3 −3

Original line number	Diff line number	Diff line
		@@ -99,10 +99,10 @@ opal_return:
		lwz r4,8(r1);
		ld r5,PPC_LR_STKOFF(r1);
		ld r6,PACASAVEDMSR(r13);
		mtspr SPRN_SRR0,r5;
		mtspr SPRN_SRR1,r6;
		mtcr r4;
		rfid
		mtspr SPRN_HSRR0,r5;
		mtspr SPRN_HSRR1,r6;
		hrfid

		opal_real_call:
		mfcr r11