[RFC PATCH 32/36] arm64: suspend: Always initialise PSTATE.ALLINT

[Vladimir Murzin]

PSTATE.ALLINT is always set to the inverse of SCTLR_ELx.SPINTMASK,
regardless of the value of SCTLR_ELx.NMI. SCTLR_ELx.NMI is initialised
to 0 by default, so PSTATE.ALLINT does not cause any interrupt
masking. With upcoming FEAT_NMI support, SCTLR_ELx.NMI will be set as
part of the enable sequence.

However, during CPU suspend/resume, we reinitialise PSTATE to
INIT_PSTATE_EL1. INIT_PSTATE_EL1 currently does not set
PSR_ALLINT_BIT, but SCTLR_ELx.NMI is restored from the saved
value. Since all exceptions are masked during CPU suspend/resume,
avoid a state where SCTLR_ELx.NMI is restored to 1 but PSTATE.ALLINT
is clear, since that would permit an NMI during resume.

Include PSR_ALLINT_BIT in INIT_PSTATE_EL1 so PSTATE.ALLINT is always
set.

Signed-off-by: Vladimir Murzin <vladimir.murzin at arm.com>
---
 arch/arm64/include/asm/ptrace.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
index 096d85d75bd7..ab1cf7669140 100644
--- a/arch/arm64/include/asm/ptrace.h
+++ b/arch/arm64/include/asm/ptrace.h
@@ -17,7 +17,7 @@
 #define CurrentEL_EL2		(2 << 2)
 
 #define INIT_PSTATE_EL1 \
-	(PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | PSR_MODE_EL1h)
+	(PSR_ALLINT_BIT | PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | PSR_MODE_EL1h)
 
 #include <linux/irqchip/arm-gic-v3-prio.h>
 
-- 
2.34.1