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| author | James Morse <james.morse@arm.com> | 2019-01-29 21:48:50 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-02-08 01:10:45 +0300 |
| commit | d44f1b8dd7e66d80cc4205809e5ace866bd851da (patch) | |
| tree | 102c993327b0f620c9d1aefcc95ad3d7819fd68c /arch/arm64/include/asm/daifflags.h | |
| parent | 0db5e0223035b2c84e6186831fc27511270af812 (diff) | |
| download | linux-d44f1b8dd7e66d80cc4205809e5ace866bd851da.tar.xz | |
arm64: KVM/mm: Move SEA handling behind a single 'claim' interface
To split up APEIs in_nmi() path, the caller needs to always be
in_nmi(). Add a helper to do the work and claim the notification.
When KVM or the arch code takes an exception that might be a RAS
notification, it asks the APEI firmware-first code whether it wants
to claim the exception. A future kernel-first mechanism may be queried
afterwards, and claim the notification, otherwise we fall through
to the existing default behaviour.
The NOTIFY_SEA code was merged before considering multiple, possibly
interacting, NMI-like notifications and the need to consider kernel
first in the future. Make the 'claiming' behaviour explicit.
Restructuring the APEI code to allow multiple NMI-like notifications
means any notification that might interrupt interrupts-masked
code must always be wrapped in nmi_enter()/nmi_exit(). This will
allow APEI to use in_nmi() to use the right fixmap entries.
Mask SError over this window to prevent an asynchronous RAS error
arriving and tripping 'nmi_enter()'s BUG_ON(in_nmi()).
Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Tested-by: Tyler Baicar <tbaicar@codeaurora.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'arch/arm64/include/asm/daifflags.h')
| -rw-r--r-- | arch/arm64/include/asm/daifflags.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/daifflags.h b/arch/arm64/include/asm/daifflags.h index 8d91f2233135..fa90779fc752 100644 --- a/arch/arm64/include/asm/daifflags.h +++ b/arch/arm64/include/asm/daifflags.h @@ -20,6 +20,7 @@ #define DAIF_PROCCTX 0 #define DAIF_PROCCTX_NOIRQ PSR_I_BIT +#define DAIF_ERRCTX (PSR_I_BIT | PSR_A_BIT) /* mask/save/unmask/restore all exceptions, including interrupts. */ static inline void local_daif_mask(void) |