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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>
hifive-unleashed-5.1
Nicholas Piggin 2017-05-01 22:01:10 +10:00 committed by Michael Ellerman
parent f1fe525201
commit c07e1b8a27
1 changed files with 3 additions and 3 deletions
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6
arch/powerpc/platforms/powernv/opal-wrappers.S
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@ -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