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arm64: acpi: fix DAIF manipulation with pNMI 

Since commit:

  d44f1b8dd7 ("arm64: KVM/mm: Move SEA handling behind a single 'claim' interface")

... the top-level APEI SEA handler has the shape:

1. current_flags = arch_local_save_flags()
2. local_daif_restore(DAIF_ERRCTX)
3. <GHES handler>
4. local_daif_restore(current_flags)

However, since commit:

  4a503217ce ("arm64: irqflags: Use ICC_PMR_EL1 for interrupt masking")

... when pseudo-NMIs (pNMIs) are in use, arch_local_save_flags() will save
the PMR value rather than the DAIF flags.

The combination of these two commits means that the APEI SEA handler will
erroneously attempt to restore the PMR value into DAIF. Fix this by
factoring local_daif_save_flags() out of local_daif_save(), so that we
can consistently save DAIF in step #1, regardless of whether pNMIs are in
use.

Both commits were introduced concurrently in v5.0.

Cc: <stable@vger.kernel.org>
Fixes: 4a503217ce ("arm64: irqflags: Use ICC_PMR_EL1 for interrupt masking")
Fixes: d44f1b8dd7 ("arm64: KVM/mm: Move SEA handling behind a single 'claim' interface")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Julien Thierry <julien.thierry.kdev@gmail.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
alistair/sensors
Mark Rutland 2020-01-22 12:45:46 +00:00 committed by Will Deacon
parent bc20606594
commit e533dbe9dc
2 changed files with 11 additions and 2 deletions
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11
arch/arm64/include/asm/daifflags.h
View File

@ -38,7 +38,7 @@ static inline void local_daif_mask(void)
trace_hardirqs_off();
}
static inline unsigned long local_daif_save(void)
static inline unsigned long local_daif_save_flags(void)
{
unsigned long flags;
@ -50,6 +50,15 @@ static inline unsigned long local_daif_save(void)
flags |= PSR_I_BIT;
}
return flags;
}
static inline unsigned long local_daif_save(void)
{
unsigned long flags;
flags = local_daif_save_flags();
local_daif_mask();
return flags;

2
arch/arm64/kernel/acpi.c
View File

@ -274,7 +274,7 @@ int apei_claim_sea(struct pt_regs *regs)
if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES))
return err;
current_flags = arch_local_save_flags();
current_flags = local_daif_save_flags();
/*
* SEA can interrupt SError, mask it and describe this as an NMI so